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@@ -22,263 +22,234 @@
</legalnotice>
<title>crypto</title>
- <prepared>Peter H&ouml;gfeldt</prepared>
- <docno></docno>
- <date>2000-06-20</date>
- <rev>B</rev>
</header>
<module>crypto</module>
<modulesummary>Crypto Functions</modulesummary>
<description>
<p>This module provides a set of cryptographic functions.
</p>
- <p>References:</p>
<list type="bulleted">
<item>
- <p>md4: The MD4 Message Digest Algorithm (RFC 1320)</p>
- </item>
- <item>
- <p>md5: The MD5 Message Digest Algorithm (RFC 1321)</p>
- </item>
- <item>
- <p>sha: Secure Hash Standard (FIPS 180-2)</p>
- </item>
- <item>
- <p>hmac: Keyed-Hashing for Message Authentication (RFC 2104)</p>
- </item>
- <item>
- <p>des: Data Encryption Standard (FIPS 46-3)</p>
+ <p>Hash functions -
+ <url href="http://csrc.nist.gov/publications/fips/fips180-4/fips-180-4.pdf"> Secure Hash Standard</url>,
+ <url href="http://www.ietf.org/rfc/rfc1321.txt"> The MD5 Message Digest Algorithm (RFC 1321)</url> and
+ <url href="http://www.ietf.org/rfc/rfc1320.txt">The MD4 Message Digest Algorithm (RFC 1320)</url>
+ </p>
</item>
<item>
- <p>aes: Advanced Encryption Standard (AES) (FIPS 197) </p>
+ <p>Hmac functions - <url href="http://www.ietf.org/rfc/rfc2104.txt"> Keyed-Hashing for Message Authentication (RFC 2104) </url></p>
</item>
<item>
- <p>ecb, cbc, cfb, ofb, ctr: Recommendation for Block Cipher Modes
- of Operation (NIST SP 800-38A).</p>
+ <p>Block ciphers - <url href="http://csrc.nist.gov/groups/ST/toolkit/block_ciphers.html"> </url> DES and AES in
+ Block Cipher Modes - <url href="http://csrc.nist.gov/groups/ST/toolkit/BCM/index.html"> ECB, CBC, CFB, OFB and CTR </url></p>
</item>
<item>
- <p>rsa: Recommendation for Block Cipher Modes of Operation
- (NIST 800-38A)</p>
+ <p><url href="http://www.ietf.org/rfc/rfc1321.txt"> RSA encryption RFC 1321 </url> </p>
</item>
<item>
- <p>dss: Digital Signature Standard (FIPS 186-2)</p>
+ <p>Digital signatures <url href="http://csrc.nist.gov/publications/drafts/fips186-3/fips_186-3.pdf">Digital Signature Standard (DSS)</url> and<url href="http://csrc.nist.gov/groups/STM/cavp/documents/dss2/ecdsa2vs.pdf"> Elliptic Curve Digital
+ Signature Algorithm (ECDSA) </url> </p>
</item>
<item>
- <p>srp: Secure Remote Password Protocol (RFC 2945)</p>
+ <p><url href="http://www.ietf.org/rfc/rfc2945.txt"> Secure Remote Password Protocol (SRP - RFC 2945) </url></p>
</item>
-
-
</list>
- <p>The above publications can be found at <url href="http://csrc.nist.gov/publications">NIST publications</url>, at <url href="http://www.ietf.org">IETF</url>.
- </p>
- <p><em>Types</em></p>
- <pre>
-byte() = 0 ... 255
-ioelem() = byte() | binary() | iolist()
-iolist() = [ioelem()]
-Mpint() = <![CDATA[<<ByteLen:32/integer-big, Bytes:ByteLen/binary>>]]>
- </pre>
- <p></p>
</description>
+
+ <section>
+ <title>DATA TYPES </title>
+
+ <p><code>key_value() = integer() | binary() </code></p>
+ <p>Always <c>binary()</c> when used as return value</p>
+
+ <p><code>rsa_public() = [key_value()] = [E, N] </code></p>
+ <p> Where E is the public exponent and N is public modulus. </p>
+
+ <p><code>rsa_private() = [key_value()] = [E, N, D] | [E, N, D, P1, P2, E1, E2, C] </code></p>
+ <p>Where E is the public exponent, N is public modulus and D is
+ the private exponent.The longer key format contains redundant
+ information that will make the calculation faster. P1,P2 are first
+ and second prime factors. E1,E2 are first and second exponents. C
+ is the CRT coefficient. Terminology is taken from <url href="http://www.ietf.org/rfc/rfc3477.txt"> RFC 3447</url>.</p>
+
+ <p><code>dss_public() = [key_value()] = [P, Q, G, Y] </code></p>
+ <p>Where P, Q and G are the dss parameters and Y is the public key.</p>
+
+ <p><code>dss_private() = [key_value()] = [P, Q, G, X] </code></p>
+ <p>Where P, Q and G are the dss parameters and X is the private key.</p>
+
+ <p><code>srp_public() = key_value() </code></p>
+ <p>Where is <c>A</c> or <c>B</c> from <url href="http://srp.stanford.edu/design.html">SRP design</url></p>
+
+ <p><code>srp_private() = key_value() </code></p>
+ <p>Where is <c>a</c> or <c>b</c> from <url href="http://srp.stanford.edu/design.html">SRP design</url></p>
+
+ <p>Where Verifier is <c>v</c>, Generator is <c>g</c> and Prime is<c> N</c>, DerivedKey is <c>X</c>, and Scrambler is
+ <c>u</c> (optional will be generated if not provided) from <url href="http://srp.stanford.edu/design.html">SRP design</url>
+ Version = '3' | '6' | '6a'
+ </p>
+
+ <p><code>dh_public() = key_value() </code></p>
+
+ <p><code>dh_private() = key_value() </code></p>
+
+ <p><code>dh_params() = [key_value()] = [P, G] </code></p>
+
+ <p><code>ecdh_public() = key_value() </code></p>
+
+ <p><code>ecdh_private() = key_value() </code></p>
+
+ <p><code>ecdh_params() = ec_named_curve() |
+ {ec_field(), Prime :: key_value(), Point :: key_value(), Order :: integer(), CoFactor :: none | integer()} </code></p>
+
+ <p><code>ec_field() = {prime_field, Prime :: integer()} |
+ {characteristic_two_field, M :: integer(), Basis :: ec_basis()}</code></p>
+
+ <p><code>ec_basis() = {tpbasis, K :: non_neg_integer()} |
+ {ppbasis, K1 :: non_neg_integer(), K2 :: non_neg_integer(), K3 :: non_neg_integer()} |
+ onbasis</code></p>
+
+ <p><code>ec_named_curve() ->
+ sect571r1| sect571k1| sect409r1| sect409k1| secp521r1| secp384r1| secp224r1| secp224k1|
+ secp192k1| secp160r2| secp128r2| secp128r1| sect233r1| sect233k1| sect193r2| sect193r1|
+ sect131r2| sect131r1| sect283r1| sect283k1| sect163r2| secp256k1| secp160k1| secp160r1|
+ secp112r2| secp112r1| sect113r2| sect113r1| sect239k1| sect163r1| sect163k1| secp256r1|
+ secp192r1 </code></p>
+
+ <p><code>stream_cipher() = rc4 | aes_ctr </code></p>
+
+ <p><code>block_cipher() = aes_cbc128 | aes_cfb128 | blowfish_cbc |
+ blowfish_cfb64 | des_cbc | des_cfb | des3_cbc | des3_cbf
+ | des_ede3 | rc2_cbc </code></p>
+
+ <p><code>stream_key() = aes_key() | rc4_key() </code></p>
+
+ <p><code>block_key() = aes_key() | blowfish_key() | des_key()| des3_key() </code></p>
+
+ <p><code>aes_key() = iodata() </code> Key length is 128, 192 or 256 bits</p>
+
+ <p><code>rc4_key() = iodata() </code> Variable key length from 8 bits up to 2048 bits (usually between 40 and 256)</p>
+
+ <p><code>blowfish_key() = iodata() </code> Variable key length from 32 bits up to 448 bits</p>
+
+ <p><code>des_key() = iodata() </code> Key length is 64 bits (in CBC mode only 8 bits are used)</p>
+
+ <p><code>des3_key() = [binary(), binary(), binary()] </code> Each key part is 64 bits (in CBC mode only 8 bits are used)</p>
+
+ <p><code>digest_type() = md5 | sha | sha224 | sha256 | sha384 | sha512</code></p>
+
+ <p><code> hash_algorithms() = md5 | ripemd160 | sha | sha224 | sha256 | sha384 | sha512 </code> md4 is also supported for hash_init/1 and hash/2.
+ Note that both md4 and md5 are recommended only for compatibility with existing applications.
+ </p>
+ <p><code> cipher_algorithms() = des_cbc | des_cfb | des3_cbc | des3_cbf | des_ede3 |
+ blowfish_cbc | blowfish_cfb64 | aes_cbc128 | aes_cfb128| aes_cbc256 | rc2_cbc | aes_ctr| rc4 </code> </p>
+ <p><code> public_key_algorithms() = rsa |dss | ecdsa | dh | ecdh </code> </p>
+
+ </section>
+
<funcs>
- <func>
- <name>start() -> ok</name>
- <fsummary>Start the crypto server.</fsummary>
- <desc>
- <p>Starts the crypto server.</p>
- </desc>
- </func>
- <func>
- <name>stop() -> ok</name>
- <fsummary>Stop the crypto server.</fsummary>
- <desc>
- <p>Stops the crypto server.</p>
- </desc>
- </func>
- <func>
- <name>info() -> [atom()]</name>
- <fsummary>Provide a list of available crypto functions.</fsummary>
- <desc>
- <p>Provides the available crypto functions in terms of a list
- of atoms.</p>
- </desc>
- </func>
- <func>
- <name>algorithms() -> [atom()]</name>
- <fsummary>Provide a list of available crypto algorithms.</fsummary>
- <desc>
- <p>Provides the available crypto algorithms in terms of a list
- of atoms.</p>
- </desc>
- </func>
- <func>
- <name>info_lib() -> [{Name,VerNum,VerStr}]</name>
- <fsummary>Provides information about the libraries used by crypto.</fsummary>
+ <func>
+ <name>block_encrypt(Type, Key, Ivec, PlainText) -> CipherText</name>
+ <fsummary>Encrypt <c>PlainText</c>according to <c>Type</c> block cipher</fsummary>
<type>
- <v>Name = binary()</v>
- <v>VerNum = integer()</v>
- <v>VerStr = binary()</v>
+ <v>Type = block_cipher() </v>
+ <v>Key = block_key() </v>
+ <v>PlainText = iodata() </v>
+ <v>IVec = CipherText = binary()</v>
</type>
<desc>
- <p>Provides the name and version of the libraries used by crypto.</p>
- <p><c>Name</c> is the name of the library. <c>VerNum</c> is
- the numeric version according to the library's own versioning
- scheme. <c>VerStr</c> contains a text variant of the version.</p>
- <pre>
-> <input>info_lib().</input>
-[{&lt;&lt;"OpenSSL"&gt;&gt;,9469983,&lt;&lt;"OpenSSL 0.9.8a 11 Oct 2005"&gt;&gt;}]
- </pre>
- <note><p>
- From OTP R16 the <em>numeric version</em> represents the version of the OpenSSL
- <em>header files</em> (<c>openssl/opensslv.h</c>) used when crypto was compiled.
- The text variant represents the OpenSSL library used at runtime.
- In earlier OTP versions both numeric and text was taken from the library.
- </p></note>
- </desc>
- </func>
- <func>
- <name>md4(Data) -> Digest</name>
- <fsummary>Compute an <c>MD4</c>message digest from <c>Data</c></fsummary>
- <type>
- <v>Data = iolist() | binary()</v>
- <v>Digest = binary()</v>
- </type>
- <desc>
- <p>Computes an <c>MD4</c> message digest from <c>Data</c>, where
- the length of the digest is 128 bits (16 bytes).</p>
- </desc>
- </func>
- <func>
- <name>md4_init() -> Context</name>
- <fsummary>Creates an MD4 context</fsummary>
- <type>
- <v>Context = binary()</v>
- </type>
- <desc>
- <p>Creates an MD4 context, to be used in subsequent calls to
- <c>md4_update/2</c>.</p>
- </desc>
- </func>
- <func>
- <name>md4_update(Context, Data) -> NewContext</name>
- <fsummary>Update an MD4 <c>Context</c>with <c>Data</c>, and return a <c>NewContext</c></fsummary>
- <type>
- <v>Data = iolist() | binary()</v>
- <v>Context = NewContext = binary()</v>
- </type>
- <desc>
- <p>Updates an MD4 <c>Context</c> with <c>Data</c>, and returns
- a <c>NewContext</c>.</p>
- </desc>
- </func>
- <func>
- <name>md4_final(Context) -> Digest</name>
- <fsummary>Finish the update of an MD4 <c>Context</c>and return the computed <c>MD4</c>message digest</fsummary>
- <type>
- <v>Context = Digest = binary()</v>
- </type>
- <desc>
- <p>Finishes the update of an MD4 <c>Context</c> and returns
- the computed <c>MD4</c> message digest.</p>
- </desc>
- </func>
- <func>
- <name>md5(Data) -> Digest</name>
- <fsummary>Compute an <c>MD5</c>message digest from <c>Data</c></fsummary>
- <type>
- <v>Data = iolist() | binary()</v>
- <v>Digest = binary()</v>
- </type>
- <desc>
- <p>Computes an <c>MD5</c> message digest from <c>Data</c>, where
- the length of the digest is 128 bits (16 bytes).</p>
- </desc>
- </func>
- <func>
- <name>md5_init() -> Context</name>
- <fsummary>Creates an MD5 context</fsummary>
- <type>
- <v>Context = binary()</v>
- </type>
- <desc>
- <p>Creates an MD5 context, to be used in subsequent calls to
- <c>md5_update/2</c>.</p>
- </desc>
- </func>
- <func>
- <name>md5_update(Context, Data) -> NewContext</name>
- <fsummary>Update an MD5 <c>Context</c>with <c>Data</c>, and return a <c>NewContext</c></fsummary>
- <type>
- <v>Data = iolist() | binary()</v>
- <v>Context = NewContext = binary()</v>
- </type>
- <desc>
- <p>Updates an MD5 <c>Context</c> with <c>Data</c>, and returns
- a <c>NewContext</c>.</p>
+ <p>Encrypt <c>PlainText</c>according to <c>Type</c> block cipher.
+ <c>IVec</c> is an arbitrary initializing vector.
+ </p>
</desc>
</func>
+
<func>
- <name>md5_final(Context) -> Digest</name>
- <fsummary>Finish the update of an MD5 <c>Context</c>and return the computed <c>MD5</c>message digest</fsummary>
+ <name>block_decrypt(Type, Key, Ivec, CipherText) -> PlainText</name>
+ <fsummary>Decrypt <c>CipherText</c>according to <c>Type</c> block cipher</fsummary>
<type>
- <v>Context = Digest = binary()</v>
+ <v>Type = block_cipher() </v>
+ <v>Key = block_key() </v>
+ <v>PlainText = iodata() </v>
+ <v>IVec = CipherText = binary()</v>
</type>
<desc>
- <p>Finishes the update of an MD5 <c>Context</c> and returns
- the computed <c>MD5</c> message digest.</p>
+ <p>Decrypt <c>CipherText</c>according to <c>Type</c> block cipher.
+ <c>IVec</c> is an arbitrary initializing vector.
+ </p>
</desc>
</func>
- <func>
- <name>sha(Data) -> Digest</name>
- <fsummary>Compute an <c>SHA</c>message digest from <c>Data</c></fsummary>
+
+ <func>
+ <name>bytes_to_integer(Bin) -> Integer </name>
+ <fsummary>Convert binary representation, of an integer, to an Erlang integer.</fsummary>
<type>
- <v>Data = iolist() | binary()</v>
- <v>Digest = binary()</v>
+ <v>Bin = binary() - as returned by crypto functions</v>
+
+ <v>Integer = integer() </v>
</type>
<desc>
- <p>Computes an <c>SHA</c> message digest from <c>Data</c>, where
- the length of the digest is 160 bits (20 bytes).</p>
+ <p>Convert binary representation, of an integer, to an Erlang integer.
+ </p>
</desc>
</func>
+
<func>
- <name>sha_init() -> Context</name>
- <fsummary>Create an SHA context</fsummary>
+ <name>compute_key(Type, OthersPublicKey, MyKey, Params) -> SharedSecret</name>
+ <fsummary>Computes the shared secret</fsummary>
<type>
- <v>Context = binary()</v>
+ <v> Type = dh | ecdh | srp </v>
+ <v>OthersPublicKey = dh_public() | ecdh_public() | srp_public() </v>
+ <v>MyKey = dh_private() | ecdh_private() | {srp_public(),srp_private()}</v>
+ <v>Params = dh_params() | ecdh_params() | SrpUserParams | SrpHostParams</v>
+ <v>SrpUserParams = {user, [DerivedKey::binary(), Prime::binary(), Generator::binary(), Version::atom() | [Scrambler:binary()]]} </v>
+ <v>SrpHostParams = {host, [Verifier::binary(), Prime::binary(), Version::atom() | [Scrambler::binary]]} </v>
+ <v>SharedSecret = binary()</v>
</type>
<desc>
- <p>Creates an SHA context, to be used in subsequent calls to
- <c>sha_update/2</c>.</p>
+ <p>Computes the shared secret from the private key and the other party's public key.
+ See also <seealso marker="public_key:public_key#compute_key/2">public_key:compute_key/2</seealso>
+ </p>
</desc>
</func>
+
<func>
- <name>sha_update(Context, Data) -> NewContext</name>
- <fsummary>Update an SHA context</fsummary>
+ <name>exor(Data1, Data2) -> Result</name>
+ <fsummary>XOR data</fsummary>
<type>
- <v>Data = iolist() | binary()</v>
- <v>Context = NewContext = binary()</v>
+ <v>Data1, Data2 = iodata()</v>
+ <v>Result = binary()</v>
</type>
<desc>
- <p>Updates an SHA <c>Context</c> with <c>Data</c>, and returns
- a <c>NewContext</c>.</p>
+ <p>Performs bit-wise XOR (exclusive or) on the data supplied.</p>
</desc>
</func>
- <func>
- <name>sha_final(Context) -> Digest</name>
- <fsummary>Finish the update of an SHA context</fsummary>
- <type>
- <v>Context = Digest = binary()</v>
- </type>
- <desc>
- <p>Finishes the update of an SHA <c>Context</c> and returns
- the computed <c>SHA</c> message digest.</p>
+
+ <func>
+ <name>generate_key(Type, Params) -> {PublicKey, PrivKeyOut} </name>
+ <name>generate_key(Type, Params, PrivKeyIn) -> {PublicKey, PrivKeyOut} </name>
+ <fsummary>Generates a public keys of type <c>Type</c></fsummary>
+ <type>
+ <v> Type = dh | ecdh | srp </v>
+ <v>Params = dh_params() | ecdh_params() | SrpUserParams | SrpHostParams </v>
+ <v>SrpUserParams = {user, [Generator::binary(), Prime::binary(), Version::atom()]}</v>
+ <v>SrpHostParams = {host, [Verifier::binary(), Generator::binary(), Prime::binary(), Version::atom()]}</v>
+ <v>PublicKey = dh_public() | ecdh_public() | srp_public() </v>
+ <v>PrivKeyIn = undefined | dh_private() | srp_private() </v>
+ <v>PrivKeyOut = dh_private() | ecdh_private() | srp_private() </v>
+ </type>
+ <desc>
+ <p>Generates public keys of type <c>Type</c>.
+ See also <seealso marker="public_key:public_key#generate_key/1">public_key:generate_key/1</seealso>
+ </p>
</desc>
</func>
- <func>
+
+ <func>
<name>hash(Type, Data) -> Digest</name>
<fsummary></fsummary>
<type>
- <v>Type = md4 | md5 | ripemd160 | sha | sha224 | sha256 | sha384 | sha512</v>
+ <v>Type = md4 | message_digest_algorithms()</v>
<v>Data = iodata()</v>
<v>Digest = binary()</v>
</type>
@@ -288,11 +259,12 @@ Mpint() = <![CDATA[<<ByteLen:32/integer-big, Bytes:ByteLen/binary>>]]>
is not supported by the underlying OpenSSL implementation.</p>
</desc>
</func>
+
<func>
<name>hash_init(Type) -> Context</name>
<fsummary></fsummary>
<type>
- <v>Type = md4 | md5 | ripemd160 | sha | sha224 | sha256 | sha384 | sha512</v>
+ <v>Type = md4 | message_digest_algorithms()</v>
</type>
<desc>
<p>Initializes the context for streaming hash operations. <c>Type</c> determines
@@ -302,6 +274,7 @@ Mpint() = <![CDATA[<<ByteLen:32/integer-big, Bytes:ByteLen/binary>>]]>
is not supported by the underlying OpenSSL implementation.</p>
</desc>
</func>
+
<func>
<name>hash_update(Context, Data) -> NewContext</name>
<fsummary></fsummary>
@@ -329,38 +302,13 @@ Mpint() = <![CDATA[<<ByteLen:32/integer-big, Bytes:ByteLen/binary>>]]>
function used to generate it.</p>
</desc>
</func>
- <func>
- <name>md5_mac(Key, Data) -> Mac</name>
- <fsummary>Compute an <c>MD5 MAC</c>message authentification code</fsummary>
- <type>
- <v>Key = Data = iolist() | binary()</v>
- <v>Mac = binary()</v>
- </type>
- <desc>
- <p>Computes an <c>MD5 MAC</c> message authentification code
- from <c>Key</c> and <c>Data</c>, where the the length of the
- Mac is 128 bits (16 bytes).</p>
- </desc>
- </func>
- <func>
- <name>md5_mac_96(Key, Data) -> Mac</name>
- <fsummary>Compute an <c>MD5 MAC</c>message authentification code</fsummary>
- <type>
- <v>Key = Data = iolist() | binary()</v>
- <v>Mac = binary()</v>
- </type>
- <desc>
- <p>Computes an <c>MD5 MAC</c> message authentification code
- from <c>Key</c> and <c>Data</c>, where the length of the Mac
- is 96 bits (12 bytes).</p>
- </desc>
- </func>
+
<func>
<name>hmac(Type, Key, Data) -> Mac</name>
<name>hmac(Type, Key, Data, MacLength) -> Mac</name>
<fsummary></fsummary>
<type>
- <v>Type = md5 | sha | sha224 | sha256 | sha384 | sha512</v>
+ <v>Type = message_digest_algorithms() </v>
<v>Key = iodata()</v>
<v>Data = iodata()</v>
<v>MacLength = integer()</v>
@@ -372,12 +320,13 @@ Mpint() = <![CDATA[<<ByteLen:32/integer-big, Bytes:ByteLen/binary>>]]>
will limit the size of the resultant <c>Mac</c>.
</desc>
</func>
+
<func>
<name>hmac_init(Type, Key) -> Context</name>
<fsummary></fsummary>
<type>
- <v>Type = md5 | ripemd160 | sha | sha224 | sha256 | sha384 | sha512</v>
- <v>Key = iolist() | binary()</v>
+ <v>Type = message_digest_algorithms()</v>
+ <v>Key = iodata()</v>
<v>Context = binary()</v>
</type>
<desc>
@@ -386,20 +335,26 @@ Mpint() = <![CDATA[<<ByteLen:32/integer-big, Bytes:ByteLen/binary>>]]>
key. The key can be any length.</p>
</desc>
</func>
+
<func>
<name>hmac_update(Context, Data) -> NewContext</name>
<fsummary></fsummary>
<type>
<v>Context = NewContext = binary()</v>
- <v>Data = iolist() | binary()</v>
+ <v>Data = iodata()</v>
</type>
<desc>
<p>Updates the HMAC represented by <c>Context</c> using the given <c>Data</c>. <c>Context</c>
must have been generated using an HMAC init function (such as
<seealso marker="#hmac_init/2">hmac_init</seealso>). <c>Data</c> can be any length. <c>NewContext</c>
- must be passed into the next call to <c>hmac_update</c>.</p>
+ must be passed into the next call to <c>hmac_update</c>
+ or to one of the functions <seealso marker="#hmac_final/1">hmac_final</seealso> and
+ <seealso marker="#hmac_final_n/1">hmac_final_n</seealso>
+ </p>
+
</desc>
</func>
+
<func>
<name>hmac_final(Context) -> Mac</name>
<fsummary></fsummary>
@@ -411,6 +366,7 @@ Mpint() = <![CDATA[<<ByteLen:32/integer-big, Bytes:ByteLen/binary>>]]>
determined by the type of hash function used to generate it.</p>
</desc>
</func>
+
<func>
<name>hmac_final_n(Context, HashLen) -> Mac</name>
<fsummary></fsummary>
@@ -423,1024 +379,404 @@ Mpint() = <![CDATA[<<ByteLen:32/integer-big, Bytes:ByteLen/binary>>]]>
zero. <c>Mac</c> will be a binary with at most <c>HashLen</c> bytes. Note that if HashLen is greater than the actual number of bytes returned from the underlying hash, the returned hash will have fewer than <c>HashLen</c> bytes.</p>
</desc>
</func>
- <func>
- <name>sha_mac(Key, Data) -> Mac</name>
- <name>sha_mac(Key, Data, MacLength) -> Mac</name>
- <fsummary>Compute an <c>MD5 MAC</c>message authentification code</fsummary>
- <type>
- <v>Key = Data = iolist() | binary()</v>
- <v>Mac = binary()</v>
- <v>MacLenength = integer() =&lt; 20 </v>
- </type>
- <desc>
- <p>Computes an <c>SHA MAC</c> message authentification code
- from <c>Key</c> and <c>Data</c>, where the default length of the Mac
- is 160 bits (20 bytes).</p>
- </desc>
- </func>
- <func>
- <name>sha_mac_96(Key, Data) -> Mac</name>
- <fsummary>Compute an <c>SHA MAC</c>message authentification code</fsummary>
- <type>
- <v>Key = Data = iolist() | binary()</v>
- <v>Mac = binary()</v>
- </type>
- <desc>
- <p>Computes an <c>SHA MAC</c> message authentification code
- from <c>Key</c> and <c>Data</c>, where the length of the Mac
- is 96 bits (12 bytes).</p>
- </desc>
- </func>
- <func>
- <name>des_cbc_encrypt(Key, IVec, Text) -> Cipher</name>
- <fsummary>Encrypt <c>Text</c>according to DES in CBC mode</fsummary>
- <type>
- <v>Key = Text = iolist() | binary()</v>
- <v>IVec = Cipher = binary()</v>
- </type>
- <desc>
- <p>Encrypts <c>Text</c> according to DES in CBC
- mode. <c>Text</c> must be a multiple of 64 bits (8
- bytes). <c>Key</c> is the DES key, and <c>IVec</c> is an
- arbitrary initializing vector. The lengths of <c>Key</c> and
- <c>IVec</c> must be 64 bits (8 bytes).</p>
- </desc>
- </func>
- <func>
- <name>des_cbc_decrypt(Key, IVec, Cipher) -> Text</name>
- <fsummary>Decrypt <c>Cipher</c>according to DES in CBC mode</fsummary>
- <type>
- <v>Key = Cipher = iolist() | binary()</v>
- <v>IVec = Text = binary()</v>
- </type>
- <desc>
- <p>Decrypts <c>Cipher</c> according to DES in CBC mode.
- <c>Key</c> is the DES key, and <c>IVec</c> is an arbitrary
- initializing vector. <c>Key</c> and <c>IVec</c> must have
- the same values as those used when encrypting. <c>Cipher</c>
- must be a multiple of 64 bits (8 bytes). The lengths of
- <c>Key</c> and <c>IVec</c> must be 64 bits (8 bytes).</p>
- </desc>
- </func>
- <func>
- <name>des_cbc_ivec(Data) -> IVec</name>
- <fsummary>Get <c>IVec</c> to be used in next iteration of
- <c>des_cbc_[ecrypt|decrypt]</c></fsummary>
- <type>
- <v>Data = iolist() | binary()</v>
- <v>IVec = binary()</v>
- </type>
- <desc>
- <p>Returns the <c>IVec</c> to be used in a next iteration of
- <c>des_cbc_[encrypt|decrypt]</c>. <c>Data</c> is the encrypted
- data from the previous iteration step.</p>
- </desc>
- </func>
- <func>
- <name>des_cfb_encrypt(Key, IVec, Text) -> Cipher</name>
- <fsummary>Encrypt <c>Text</c>according to DES in CFB mode</fsummary>
- <type>
- <v>Key = Text = iolist() | binary()</v>
- <v>IVec = Cipher = binary()</v>
- </type>
- <desc>
- <p>Encrypts <c>Text</c> according to DES in 8-bit CFB
- mode. <c>Key</c> is the DES key, and <c>IVec</c> is an
- arbitrary initializing vector. The lengths of <c>Key</c> and
- <c>IVec</c> must be 64 bits (8 bytes).</p>
- </desc>
- </func>
- <func>
- <name>des_cfb_decrypt(Key, IVec, Cipher) -> Text</name>
- <fsummary>Decrypt <c>Cipher</c>according to DES in CFB mode</fsummary>
- <type>
- <v>Key = Cipher = iolist() | binary()</v>
- <v>IVec = Text = binary()</v>
- </type>
- <desc>
- <p>Decrypts <c>Cipher</c> according to DES in 8-bit CFB mode.
- <c>Key</c> is the DES key, and <c>IVec</c> is an arbitrary
- initializing vector. <c>Key</c> and <c>IVec</c> must have
- the same values as those used when encrypting. The lengths of
- <c>Key</c> and <c>IVec</c> must be 64 bits (8 bytes).</p>
- </desc>
- </func>
- <func>
- <name>des_cfb_ivec(IVec, Data) -> NextIVec</name>
- <fsummary>Get <c>IVec</c> to be used in next iteration of
- <c>des_cfb_[ecrypt|decrypt]</c></fsummary>
- <type>
- <v>IVec = iolist() | binary()</v>
- <v>Data = iolist() | binary()</v>
- <v>NextIVec = binary()</v>
- </type>
- <desc>
- <p>Returns the <c>IVec</c> to be used in a next iteration of
- <c>des_cfb_[encrypt|decrypt]</c>. <c>IVec</c> is the vector
- used in the previous iteration step. <c>Data</c> is the encrypted
- data from the previous iteration step.</p>
- </desc>
- </func>
- <func>
- <name>des3_cbc_encrypt(Key1, Key2, Key3, IVec, Text) -> Cipher</name>
- <fsummary>Encrypt <c>Text</c>according to DES3 in CBC mode</fsummary>
- <type>
- <v>Key1 =Key2 = Key3 Text = iolist() | binary()</v>
- <v>IVec = Cipher = binary()</v>
- </type>
- <desc>
- <p>Encrypts <c>Text</c> according to DES3 in CBC
- mode. <c>Text</c> must be a multiple of 64 bits (8
- bytes). <c>Key1</c>, <c>Key2</c>, <c>Key3</c>, are the DES
- keys, and <c>IVec</c> is an arbitrary initializing
- vector. The lengths of each of <c>Key1</c>, <c>Key2</c>,
- <c>Key3</c> and <c>IVec</c> must be 64 bits (8 bytes).</p>
- </desc>
- </func>
- <func>
- <name>des3_cbc_decrypt(Key1, Key2, Key3, IVec, Cipher) -> Text</name>
- <fsummary>Decrypt <c>Cipher</c>according to DES3 in CBC mode</fsummary>
- <type>
- <v>Key1 = Key2 = Key3 = Cipher = iolist() | binary()</v>
- <v>IVec = Text = binary()</v>
- </type>
- <desc>
- <p>Decrypts <c>Cipher</c> according to DES3 in CBC mode.
- <c>Key1</c>, <c>Key2</c>, <c>Key3</c> are the DES key, and
- <c>IVec</c> is an arbitrary initializing vector.
- <c>Key1</c>, <c>Key2</c>, <c>Key3</c> and <c>IVec</c> must
- and <c>IVec</c> must have the same values as those used when
- encrypting. <c>Cipher</c> must be a multiple of 64 bits (8
- bytes). The lengths of <c>Key1</c>, <c>Key2</c>,
- <c>Key3</c>, and <c>IVec</c> must be 64 bits (8 bytes).</p>
- </desc>
- </func>
- <func>
- <name>des3_cfb_encrypt(Key1, Key2, Key3, IVec, Text) -> Cipher</name>
- <fsummary>Encrypt <c>Text</c>according to DES3 in CFB mode</fsummary>
- <type>
- <v>Key1 =Key2 = Key3 Text = iolist() | binary()</v>
- <v>IVec = Cipher = binary()</v>
- </type>
- <desc>
- <p>Encrypts <c>Text</c> according to DES3 in 8-bit CFB
- mode. <c>Key1</c>, <c>Key2</c>, <c>Key3</c>, are the DES
- keys, and <c>IVec</c> is an arbitrary initializing
- vector. The lengths of each of <c>Key1</c>, <c>Key2</c>,
- <c>Key3</c> and <c>IVec</c> must be 64 bits (8 bytes).</p>
- <p>May throw exception <c>notsup</c> for old OpenSSL
- versions (0.9.7) that does not support this encryption mode.</p>
- </desc>
- </func>
- <func>
- <name>des3_cfb_decrypt(Key1, Key2, Key3, IVec, Cipher) -> Text</name>
- <fsummary>Decrypt <c>Cipher</c>according to DES3 in CFB mode</fsummary>
- <type>
- <v>Key1 = Key2 = Key3 = Cipher = iolist() | binary()</v>
- <v>IVec = Text = binary()</v>
- </type>
- <desc>
- <p>Decrypts <c>Cipher</c> according to DES3 in 8-bit CFB mode.
- <c>Key1</c>, <c>Key2</c>, <c>Key3</c> are the DES key, and
- <c>IVec</c> is an arbitrary initializing vector.
- <c>Key1</c>, <c>Key2</c>, <c>Key3</c> and <c>IVec</c> must
- and <c>IVec</c> must have the same values as those used when
- encrypting. The lengths of <c>Key1</c>, <c>Key2</c>,
- <c>Key3</c>, and <c>IVec</c> must be 64 bits (8 bytes).</p>
- <p>May throw exception <c>notsup</c> for old OpenSSL
- versions (0.9.7) that does not support this encryption mode.</p>
- </desc>
- </func>
-
- <func>
- <name>des_ecb_encrypt(Key, Text) -> Cipher</name>
- <fsummary>Encrypt <c>Text</c>according to DES in ECB mode</fsummary>
- <type>
- <v>Key = Text = iolist() | binary()</v>
- <v>Cipher = binary()</v>
- </type>
- <desc>
- <p>Encrypts <c>Text</c> according to DES in ECB mode.
- <c>Key</c> is the DES key. The lengths of <c>Key</c> and
- <c>Text</c> must be 64 bits (8 bytes).</p>
- </desc>
- </func>
- <func>
- <name>des_ecb_decrypt(Key, Cipher) -> Text</name>
- <fsummary>Decrypt <c>Cipher</c>according to DES in ECB mode</fsummary>
- <type>
- <v>Key = Cipher = iolist() | binary()</v>
- <v>Text = binary()</v>
- </type>
- <desc>
- <p>Decrypts <c>Cipher</c> according to DES in ECB mode.
- <c>Key</c> is the DES key. The lengths of <c>Key</c> and
- <c>Cipher</c> must be 64 bits (8 bytes).</p>
- </desc>
- </func>
<func>
- <name>blowfish_ecb_encrypt(Key, Text) -> Cipher</name>
- <fsummary>Encrypt the first 64 bits of <c>Text</c> using Blowfish in ECB mode</fsummary>
- <type>
- <v>Key = Text = iolist() | binary()</v>
- <v>Cipher = binary()</v>
- </type>
- <desc>
- <p>Encrypts the first 64 bits of <c>Text</c> using Blowfish in ECB mode. <c>Key</c> is the Blowfish key. The length of <c>Text</c> must be at least 64 bits (8 bytes).</p>
- </desc>
- </func>
- <func>
- <name>blowfish_ecb_decrypt(Key, Text) -> Cipher</name>
- <fsummary>Decrypt the first 64 bits of <c>Text</c> using Blowfish in ECB mode</fsummary>
+ <name>info_lib() -> [{Name,VerNum,VerStr}]</name>
+ <fsummary>Provides information about the libraries used by crypto.</fsummary>
<type>
- <v>Key = Text = iolist() | binary()</v>
- <v>Cipher = binary()</v>
+ <v>Name = binary()</v>
+ <v>VerNum = integer()</v>
+ <v>VerStr = binary()</v>
</type>
<desc>
- <p>Decrypts the first 64 bits of <c>Text</c> using Blowfish in ECB mode. <c>Key</c> is the Blowfish key. The length of <c>Text</c> must be at least 64 bits (8 bytes).</p>
+ <p>Provides the name and version of the libraries used by crypto.</p>
+ <p><c>Name</c> is the name of the library. <c>VerNum</c> is
+ the numeric version according to the library's own versioning
+ scheme. <c>VerStr</c> contains a text variant of the version.</p>
+ <pre>
+> <input>info_lib().</input>
+[{&lt;&lt;"OpenSSL"&gt;&gt;,9469983,&lt;&lt;"OpenSSL 0.9.8a 11 Oct 2005"&gt;&gt;}]
+ </pre>
+ <note><p>
+ From OTP R16 the <em>numeric version</em> represents the version of the OpenSSL
+ <em>header files</em> (<c>openssl/opensslv.h</c>) used when crypto was compiled.
+ The text variant represents the OpenSSL library used at runtime.
+ In earlier OTP versions both numeric and text was taken from the library.
+ </p></note>
</desc>
</func>
<func>
- <name>blowfish_cbc_encrypt(Key, IVec, Text) -> Cipher</name>
- <fsummary>Encrypt <c>Text</c> using Blowfish in CBC mode</fsummary>
- <type>
- <v>Key = Text = iolist() | binary()</v>
- <v>IVec = Cipher = binary()</v>
- </type>
- <desc>
- <p>Encrypts <c>Text</c> using Blowfish in CBC mode. <c>Key</c> is the Blowfish key, and <c>IVec</c> is an
- arbitrary initializing vector. The length of <c>IVec</c>
- must be 64 bits (8 bytes). The length of <c>Text</c> must be a multiple of 64 bits (8 bytes).</p>
- </desc>
- </func>
- <func>
- <name>blowfish_cbc_decrypt(Key, IVec, Text) -> Cipher</name>
- <fsummary>Decrypt <c>Text</c> using Blowfish in CBC mode</fsummary>
+ <name>mod_pow(N, P, M) -> Result</name>
+ <fsummary>Computes the function: N^P mod M</fsummary>
<type>
- <v>Key = Text = iolist() | binary()</v>
- <v>IVec = Cipher = binary()</v>
+ <v>N, P, M = binary() | integer()</v>
+ <v>Result = binary() | error</v>
</type>
<desc>
- <p>Decrypts <c>Text</c> using Blowfish in CBC mode. <c>Key</c> is the Blowfish key, and <c>IVec</c> is an
- arbitrary initializing vector. The length of <c>IVec</c>
- must be 64 bits (8 bytes). The length of <c>Text</c> must be a multiple 64 bits (8 bytes).</p>
+ <p>Computes the function <c>N^P mod M</c>.</p>
</desc>
</func>
<func>
- <name>blowfish_cfb64_encrypt(Key, IVec, Text) -> Cipher</name>
- <fsummary>Encrypt <c>Text</c>using Blowfish in CFB mode with 64
- bit feedback</fsummary>
- <type>
- <v>Key = Text = iolist() | binary()</v>
- <v>IVec = Cipher = binary()</v>
- </type>
- <desc>
- <p>Encrypts <c>Text</c> using Blowfish in CFB mode with 64 bit
- feedback. <c>Key</c> is the Blowfish key, and <c>IVec</c> is an
- arbitrary initializing vector. The length of <c>IVec</c>
- must be 64 bits (8 bytes).</p>
- </desc>
- </func>
- <func>
- <name>blowfish_cfb64_decrypt(Key, IVec, Text) -> Cipher</name>
- <fsummary>Decrypt <c>Text</c>using Blowfish in CFB mode with 64
- bit feedback</fsummary>
- <type>
- <v>Key = Text = iolist() | binary()</v>
- <v>IVec = Cipher = binary()</v>
- </type>
- <desc>
- <p>Decrypts <c>Text</c> using Blowfish in CFB mode with 64 bit
- feedback. <c>Key</c> is the Blowfish key, and <c>IVec</c> is an
- arbitrary initializing vector. The length of <c>IVec</c>
- must be 64 bits (8 bytes).</p>
- </desc>
+ <name>next_iv(Type, Data) -> NextIVec</name>
+ <name>next_iv(Type, Data, IVec) -> NextIVec</name>
+ <fsummary></fsummary>
+ <type>
+ <v>Type = des_cbc | des3_cbc | aes_cbc | des_cfb</v>
+ <v>Data = iodata()</v>
+ <v>IVec = NextIVec = binary()</v>
+ </type>
+ <desc>
+ <p>Returns the initialization vector to be used in the next
+ iteration of encrypt/decrypt of type <c>Type</c>. <c>Data</c> is the
+ encrypted data from the previous iteration step. The <c>IVec</c>
+ argument is only needed for <c>des_cfb</c> as the vector used
+ in the previous iteration step.</p>
+ </desc>
</func>
<func>
- <name>blowfish_ofb64_encrypt(Key, IVec, Text) -> Cipher</name>
- <fsummary>Encrypt <c>Text</c>using Blowfish in OFB mode with 64
- bit feedback</fsummary>
+ <name>private_decrypt(Type, ChipherText, PrivateKey, Padding) -> PlainText</name>
+ <fsummary>Decrypts ChipherText using the private Key.</fsummary>
<type>
- <v>Key = Text = iolist() | binary()</v>
- <v>IVec = Cipher = binary()</v>
+ <v>Type = rsa</v>
+ <v>ChipherText = binary()</v>
+ <v>PrivateKey = rsa_private()</v>
+ <v>Padding = rsa_pkcs1_padding | rsa_pkcs1_oaep_padding | rsa_no_padding</v>
+ <v>PlainText = binary()</v>
</type>
<desc>
- <p>Encrypts <c>Text</c> using Blowfish in OFB mode with 64 bit
- feedback. <c>Key</c> is the Blowfish key, and <c>IVec</c> is an
- arbitrary initializing vector. The length of <c>IVec</c>
- must be 64 bits (8 bytes).</p>
+ <p>Decrypts the <c>ChipherText</c> (usually a session key encrypted with
+ <seealso marker="#public_encrypt/3">public_encrypt/3</seealso>)
+ using the <c>PrivateKey</c> and returns the
+ message. The <c>Padding</c> is the padding mode that was
+ used to encrypt the data,
+ see <seealso marker="#public_encrypt/3">public_encrypt/3</seealso>.
+ See also <seealso marker="public_key:public_key#decrypt_private/2">public_key:decrypt_private/[2,3]</seealso>
+ </p>
</desc>
</func>
<func>
- <name>aes_cfb_128_encrypt(Key, IVec, Text) -> Cipher</name>
- <fsummary>Encrypt <c>Text</c>according to AES in Cipher Feedback mode</fsummary>
- <type>
- <v>Key = Text = iolist() | binary()</v>
- <v>IVec = Cipher = binary()</v>
- </type>
- <desc>
- <p>Encrypts <c>Text</c> according to AES in Cipher Feedback
- mode (CFB). <c>Key</c> is the
- AES key, and <c>IVec</c> is an arbitrary initializing vector.
- The lengths of <c>Key</c> and <c>IVec</c> must be 128 bits
- (16 bytes).</p>
- </desc>
- </func>
- <func>
- <name>aes_cfb_128_decrypt(Key, IVec, Cipher) -> Text</name>
- <fsummary>Decrypt <c>Cipher</c>according to AES in Cipher Feedback mode</fsummary>
- <type>
- <v>Key = Cipher = iolist() | binary()</v>
- <v>IVec = Text = binary()</v>
- </type>
- <desc>
- <p>Decrypts <c>Cipher</c> according to AES in Cipher Feedback Mode (CFB).
- <c>Key</c> is the AES key, and <c>IVec</c> is an arbitrary
- initializing vector. <c>Key</c> and <c>IVec</c> must have
- the same values as those used when encrypting. The lengths of
- <c>Key</c> and <c>IVec</c> must be 128 bits (16 bytes).</p>
- </desc>
- </func>
- <func>
- <name>aes_cbc_128_encrypt(Key, IVec, Text) -> Cipher</name>
- <fsummary>Encrypt <c>Text</c>according to AES in Cipher Block Chaining mode</fsummary>
- <type>
- <v>Key = Text = iolist() | binary()</v>
- <v>IVec = Cipher = binary()</v>
- </type>
- <desc>
- <p>Encrypts <c>Text</c> according to AES in Cipher Block Chaining
- mode (CBC). <c>Text</c>
- must be a multiple of 128 bits (16 bytes). <c>Key</c> is the
- AES key, and <c>IVec</c> is an arbitrary initializing vector.
- The lengths of <c>Key</c> and <c>IVec</c> must be 128 bits
- (16 bytes).</p>
- </desc>
- </func>
- <func>
- <name>aes_cbc_128_decrypt(Key, IVec, Cipher) -> Text</name>
- <fsummary>Decrypt <c>Cipher</c>according to AES in Cipher Block Chaining mode</fsummary>
- <type>
- <v>Key = Cipher = iolist() | binary()</v>
- <v>IVec = Text = binary()</v>
- </type>
- <desc>
- <p>Decrypts <c>Cipher</c> according to AES in Cipher Block
- Chaining mode (CBC).
- <c>Key</c> is the AES key, and <c>IVec</c> is an arbitrary
- initializing vector. <c>Key</c> and <c>IVec</c> must have
- the same values as those used when encrypting. <c>Cipher</c>
- must be a multiple of 128 bits (16 bytes). The lengths of
- <c>Key</c> and <c>IVec</c> must be 128 bits (16 bytes).</p>
- </desc>
- </func>
- <func>
- <name>aes_cbc_ivec(Data) -> IVec</name>
- <fsummary>Get <c>IVec</c> to be used in next iteration of
- <c>aes_cbc_*_[ecrypt|decrypt]</c></fsummary>
- <type>
- <v>Data = iolist() | binary()</v>
- <v>IVec = binary()</v>
- </type>
- <desc>
- <p>Returns the <c>IVec</c> to be used in a next iteration of
- <c>aes_cbc_*_[encrypt|decrypt]</c>. <c>Data</c> is the encrypted
- data from the previous iteration step.</p>
- </desc>
- </func>
- <func>
- <name>aes_ctr_encrypt(Key, IVec, Text) -> Cipher</name>
- <fsummary>Encrypt <c>Text</c>according to AES in Counter mode</fsummary>
- <type>
- <v>Key = Text = iolist() | binary()</v>
- <v>IVec = Cipher = binary()</v>
- </type>
- <desc>
- <p>Encrypts <c>Text</c> according to AES in Counter mode (CTR). <c>Text</c>
- can be any number of bytes. <c>Key</c> is the AES key and must be either
- 128, 192 or 256 bits long. <c>IVec</c> is an arbitrary initializing vector of 128 bits
- (16 bytes).</p>
- </desc>
- </func>
- <func>
- <name>aes_ctr_decrypt(Key, IVec, Cipher) -> Text</name>
- <fsummary>Decrypt <c>Cipher</c>according to AES in Counter mode</fsummary>
- <type>
- <v>Key = Cipher = iolist() | binary()</v>
- <v>IVec = Text = binary()</v>
- </type>
- <desc>
- <p>Decrypts <c>Cipher</c> according to AES in Counter mode (CTR). <c>Cipher</c>
- can be any number of bytes. <c>Key</c> is the AES key and must be either
- 128, 192 or 256 bits long. <c>IVec</c> is an arbitrary initializing vector of 128 bits
- (16 bytes).</p>
- </desc>
- </func>
- <func>
- <name>aes_ctr_stream_init(Key, IVec) -> State</name>
- <fsummary></fsummary>
- <type>
- <v>State = { K, I, E, C }</v>
- <v>Key = K = iolist()</v>
- <v>IVec = I = E = binary()</v>
- <v>C = integer()</v>
- </type>
- <desc>
- <p>Initializes the state for use in streaming AES encryption using Counter mode (CTR).
- <c>Key</c> is the AES key and must be either 128, 192, or 256 bts long. <c>IVec</c> is
- an arbitrary initializing vector of 128 bits (16 bytes). This state is for use with
- <seealso marker="#aes_ctr_stream_encrypt/2">aes_ctr_stream_encrypt</seealso> and
- <seealso marker="#aes_ctr_stream_decrypt/2">aes_ctr_stream_decrypt</seealso>.</p>
- </desc>
- </func>
- <func>
- <name>aes_ctr_stream_encrypt(State, Text) -> { NewState, Cipher}</name>
- <fsummary></fsummary>
- <type>
- <v>Text = iolist() | binary()</v>
- <v>Cipher = binary()</v>
- </type>
- <desc>
- <p>Encrypts <c>Text</c> according to AES in Counter mode (CTR). This function can be
- used to encrypt a stream of text using a series of calls instead of requiring all
- text to be in memory. <c>Text</c> can be any number of bytes. State is initialized using
- <seealso marker="#aes_ctr_stream_init/2">aes_ctr_stream_init</seealso>. <c>NewState</c> is the new streaming
- encryption state that must be passed to the next call to <c>aes_ctr_stream_encrypt</c>.
- <c>Cipher</c> is the encrypted cipher text.</p>
- </desc>
- </func>
- <func>
- <name>aes_ctr_stream_decrypt(State, Cipher) -> { NewState, Text }</name>
- <fsummary></fsummary>
- <type>
- <v>Cipher = iolist() | binary()</v>
- <v>Text = binary()</v>
- </type>
- <desc>
- <p>Decrypts <c>Cipher</c> according to AES in Counter mode (CTR). This function can be
- used to decrypt a stream of ciphertext using a series of calls instead of requiring all
- ciphertext to be in memory. <c>Cipher</c> can be any number of bytes. State is initialized using
- <seealso marker="#aes_ctr_stream_init/2">aes_ctr_stream_init</seealso>. <c>NewState</c> is the new streaming
- encryption state that must be passed to the next call to <c>aes_ctr_stream_encrypt</c>.
- <c>Text</c> is the decrypted data.</p>
- </desc>
- </func>
- <func>
- <name>erlint(Mpint) -> N</name>
- <name>mpint(N) -> Mpint</name>
- <fsummary>Convert between binary multi-precision integer and erlang big integer</fsummary>
- <type>
- <v>Mpint = binary()</v>
- <v>N = integer()</v>
- </type>
- <desc>
- <p>Convert a binary multi-precision integer <c>Mpint</c> to and from
- an erlang big integer. A multi-precision integer is a binary
- with the following form:
- <c><![CDATA[<<ByteLen:32/integer, Bytes:ByteLen/binary>>]]></c> where both
- <c>ByteLen</c> and <c>Bytes</c> are big-endian. Mpints are used in
- some of the functions in <c>crypto</c> and are not translated
- in the API for performance reasons.</p>
- </desc>
- </func>
- <func>
- <name>rand_bytes(N) -> binary()</name>
- <fsummary>Generate a binary of random bytes</fsummary>
- <type>
- <v>N = integer()</v>
- </type>
- <desc>
- <p>Generates N bytes randomly uniform 0..255, and returns the
- result in a binary. Uses the <c>crypto</c> library pseudo-random
- number generator.</p>
- </desc>
- </func>
- <func>
- <name>strong_rand_bytes(N) -> binary()</name>
- <fsummary>Generate a binary of random bytes</fsummary>
- <type>
- <v>N = integer()</v>
- </type>
- <desc>
- <p>Generates N bytes randomly uniform 0..255, and returns the
- result in a binary. Uses a cryptographically secure prng seeded and
- periodically mixed with operating system provided entropy. By default
- this is the <c>RAND_bytes</c> method from OpenSSL.</p>
- <p>May throw exception <c>low_entropy</c> in case the random generator
- failed due to lack of secure "randomness".</p>
- </desc>
- </func>
- <func>
- <name>rand_uniform(Lo, Hi) -> N</name>
- <fsummary>Generate a random number</fsummary>
- <type>
- <v>Lo, Hi, N = Mpint | integer()</v>
- <v>Mpint = binary()</v>
- </type>
- <desc>
- <p>Generate a random number <c><![CDATA[N, Lo =< N < Hi.]]></c> Uses the
- <c>crypto</c> library pseudo-random number generator. The
- arguments (and result) can be either erlang integers or binary
- multi-precision integers. <c>Hi</c> must be larger than <c>Lo</c>.</p>
- </desc>
- </func>
- <func>
- <name>strong_rand_mpint(N, Top, Bottom) -> Mpint</name>
- <fsummary>Generate an N bit random number</fsummary>
- <type>
- <v>N = non_neg_integer()</v>
- <v>Top = -1 | 0 | 1</v>
- <v>Bottom = 0 | 1</v>
- <v>Mpint = binary()</v>
- </type>
- <desc>
- <p>Generate an N bit random number using OpenSSL's
- cryptographically strong pseudo random number generator
- <c>BN_rand</c>.</p>
- <p>The parameter <c>Top</c> places constraints on the most
- significant bits of the generated number. If <c>Top</c> is 1, then the
- two most significant bits will be set to 1, if <c>Top</c> is 0, the
- most significant bit will be 1, and if <c>Top</c> is -1 then no
- constraints are applied and thus the generated number may be less than
- N bits long.</p>
- <p>If <c>Bottom</c> is 1, then the generated number is
- constrained to be odd.</p>
- <p>May throw exception <c>low_entropy</c> in case the random generator
- failed due to lack of secure "randomness".</p>
- </desc>
- </func>
- <func>
- <name>mod_exp(N, P, M) -> Result</name>
- <fsummary>Perform N ^ P mod M</fsummary>
- <type>
- <v>N, P, M, Result = Mpint</v>
- <v>Mpint = binary()</v>
- </type>
- <desc>
- <p>This function performs the exponentiation <c>N ^ P mod M</c>,
- using the <c>crypto</c> library.</p>
- </desc>
- </func>
- <func>
- <name>mod_exp_prime(N, P, M) -> Result</name>
- <fsummary>Computes the function: N^P mod M</fsummary>
+ <name>private_encrypt(Type, PlainText, PrivateKey, Padding) -> ChipherText</name>
+ <fsummary>Encrypts Msg using the private Key.</fsummary>
<type>
- <v>N, P, M = binary()</v>
- <v>Result = binary() | error</v>
+ <v>Type = rsa</v>
+ <v>PlainText = binary()</v>
+ <v>PrivateKey = rsa_private()</v>
+ <v>Padding = rsa_pkcs1_padding | rsa_no_padding</v>
+ <v>ChipherText = binary()</v>
</type>
<desc>
- <p>Computes the function <c>N^P mod M</c>.</p>
+ <p>Encrypts the <c>PlainText</c> using the <c>PrivateKey</c>
+ and returns the cipher. The <c>Padding</c> decides what padding mode is used,
+ <c>rsa_pkcs1_padding</c> is PKCS #1 v1.5 currently the most
+ used mode.
+ The size of the <c>Msg</c> must be less than <c>byte_size(N)-11</c> if
+ <c>rsa_pkcs1_padding</c> is used, and <c>byte_size(N)</c> if <c>rsa_no_padding</c>
+ is used.
+ See also <seealso marker="public_key:public_key#encrypt_private/2">public_key:encrypt_private/[2,3]</seealso>
+ </p>
</desc>
</func>
<func>
- <name>rsa_sign(DataOrDigest, Key) -> Signature</name>
- <name>rsa_sign(DigestType, DataOrDigest, Key) -> Signature</name>
- <fsummary>Sign the data using rsa with the given key.</fsummary>
+ <name>public_decrypt(Type, ChipherText, PublicKey, Padding) -> PlainText</name>
+ <fsummary>Decrypts ChipherText using the public Key.</fsummary>
<type>
- <v>DataOrDigest = Data | {digest,Digest}</v>
- <v>Data = Mpint</v>
- <v>Digest = binary()</v>
- <v>Key = [E, N, D] | [E, N, D, P1, P2, E1, E2, C]</v>
- <v>E, N, D = Mpint</v>
- <d>Where <c>E</c> is the public exponent, <c>N</c> is public modulus and
- <c>D</c> is the private exponent.</d>
- <v>P1, P2, E1, E2, C = Mpint</v>
- <d>The longer key format contains redundant information that will make
- the calculation faster. <c>P1,P2</c> are first and second prime factors.
- <c>E1,E2</c> are first and second exponents. <c>C</c> is the CRT coefficient.
- Terminology is taken from RFC 3447.</d>
- <v>DigestType = md5 | sha | sha224 | sha256 | sha384 | sha512</v>
- <d>The default <c>DigestType</c> is sha.</d>
- <v>Mpint = binary()</v>
- <v>Signature = binary()</v>
+ <v>Type = rsa</v>
+ <v>ChipherText = binary()</v>
+ <v>PublicKey = rsa_public() </v>
+ <v>Padding = rsa_pkcs1_padding | rsa_no_padding</v>
+ <v>PlainText = binary()</v>
</type>
<desc>
- <p>Creates a RSA signature with the private key <c>Key</c>
- of a digest. The digest is either calculated as a
- <c>DigestType</c> digest of <c>Data</c> or a precalculated
- binary <c>Digest</c>.</p>
+ <p>Decrypts the <c>ChipherText</c> (encrypted with
+ <seealso marker="#private_encrypt/3">private_encrypt/3</seealso>)
+ using the <c>PrivateKey</c> and returns the
+ message. The <c>Padding</c> is the padding mode that was
+ used to encrypt the data,
+ see <seealso marker="#private_encrypt/3">private_encrypt/3</seealso>.
+ See also <seealso marker="public_key:public_key#decrypt_public/2">public_key:decrypt_public/[2,3]</seealso>
+ </p>
</desc>
</func>
<func>
- <name>rsa_verify(DataOrDigest, Signature, Key) -> Verified</name>
- <name>rsa_verify(DigestType, DataOrDigest, Signature, Key) -> Verified </name>
- <fsummary>Verify the digest and signature using rsa with given public key.</fsummary>
- <type>
- <v>Verified = boolean()</v>
- <v>DataOrDigest = Data | {digest|Digest}</v>
- <v>Data, Signature = Mpint</v>
- <v>Digest = binary()</v>
- <v>Key = [E, N]</v>
- <v>E, N = Mpint</v>
- <d>Where <c>E</c> is the public exponent and <c>N</c> is public modulus.</d>
- <v>DigestType = md5 | sha | sha224 | sha256 | sha384 | sha512</v>
- <d>The default <c>DigestType</c> is sha.</d>
- <v>Mpint = binary()</v>
- </type>
- <desc>
- <p>Verifies that a digest matches the RSA signature using the
- signer's public key <c>Key</c>.
- The digest is either calculated as a <c>DigestType</c>
- digest of <c>Data</c> or a precalculated binary <c>Digest</c>.</p>
- <p>May throw exception <c>notsup</c> in case the chosen <c>DigestType</c>
- is not supported by the underlying OpenSSL implementation.</p>
- </desc>
- </func>
-
- <func>
- <name>rsa_public_encrypt(PlainText, PublicKey, Padding) -> ChipherText</name>
+ <name>public_encrypt(Type, PlainText, PublicKey, Padding) -> ChipherText</name>
<fsummary>Encrypts Msg using the public Key.</fsummary>
<type>
+ <v>Type = rsa</v>
<v>PlainText = binary()</v>
- <v>PublicKey = [E, N]</v>
- <v>E, N = Mpint</v>
- <d>Where <c>E</c> is the public exponent and <c>N</c> is public modulus.</d>
+ <v>PublicKey = rsa_public()</v>
<v>Padding = rsa_pkcs1_padding | rsa_pkcs1_oaep_padding | rsa_no_padding</v>
<v>ChipherText = binary()</v>
</type>
<desc>
<p>Encrypts the <c>PlainText</c> (usually a session key) using the <c>PublicKey</c>
- and returns the cipher. The <c>Padding</c> decides what padding mode is used,
+ and returns the <c>CipherText</c>. The <c>Padding</c> decides what padding mode is used,
<c>rsa_pkcs1_padding</c> is PKCS #1 v1.5 currently the most
used mode and <c>rsa_pkcs1_oaep_padding</c> is EME-OAEP as
defined in PKCS #1 v2.0 with SHA-1, MGF1 and an empty encoding
parameter. This mode is recommended for all new applications.
The size of the <c>Msg</c> must be less
than <c>byte_size(N)-11</c> if
- <c>rsa_pkcs1_padding</c> is used, <c>byte_size(N)-41</c> if
- <c>rsa_pkcs1_oaep_padding</c> is used and <c>byte_size(N)</c> if <c>rsa_no_padding</c>
+ <c>rsa_pkcs1_padding</c> is used, <c>byte_size(N)-41</c> if
+ <c>rsa_pkcs1_oaep_padding</c> is used and <c>byte_size(N)</c> if <c>rsa_no_padding</c>
is used.
- Where byte_size(N) is the size part of an <c>Mpint-1</c>.
+ See also <seealso marker="public_key:public_key#encrypt_public/2">public_key:encrypt_public/[2,3]</seealso>
</p>
</desc>
</func>
<func>
- <name>rsa_private_decrypt(ChipherText, PrivateKey, Padding) -> PlainText</name>
- <fsummary>Decrypts ChipherText using the private Key.</fsummary>
- <type>
- <v>ChipherText = binary()</v>
- <v>PrivateKey = [E, N, D] | [E, N, D, P1, P2, E1, E2, C]</v>
- <v>E, N, D = Mpint</v>
- <d>Where <c>E</c> is the public exponent, <c>N</c> is public modulus and
- <c>D</c> is the private exponent.</d>
- <v>P1, P2, E1, E2, C = Mpint</v>
- <d>The longer key format contains redundant information that will make
- the calculation faster. <c>P1,P2</c> are first and second prime factors.
- <c>E1,E2</c> are first and second exponents. <c>C</c> is the CRT coefficient.
- Terminology is taken from RFC 3447.</d>
- <v>Padding = rsa_pkcs1_padding | rsa_pkcs1_oaep_padding | rsa_no_padding</v>
- <v>PlainText = binary()</v>
- </type>
- <desc>
- <p>Decrypts the <c>ChipherText</c> (usually a session key encrypted with
- <seealso marker="#rsa_public_encrypt/3">rsa_public_encrypt/3</seealso>)
- using the <c>PrivateKey</c> and returns the
- message. The <c>Padding</c> is the padding mode that was
- used to encrypt the data,
- see <seealso marker="#rsa_public_encrypt/3">rsa_public_encrypt/3</seealso>.
- </p>
- </desc>
- </func>
- <func>
- <name>rsa_private_encrypt(PlainText, PrivateKey, Padding) -> ChipherText</name>
- <fsummary>Encrypts Msg using the private Key.</fsummary>
+ <name>rand_bytes(N) -> binary()</name>
+ <fsummary>Generate a binary of random bytes</fsummary>
<type>
- <v>PlainText = binary()</v>
- <v>PrivateKey = [E, N, D] | [E, N, D, P1, P2, E1, E2, C]</v>
- <v>E, N, D = Mpint</v>
- <d>Where <c>E</c> is the public exponent, <c>N</c> is public modulus and
- <c>D</c> is the private exponent.</d>
- <v>P1, P2, E1, E2, C = Mpint</v>
- <d>The longer key format contains redundant information that will make
- the calculation faster. <c>P1,P2</c> are first and second prime factors.
- <c>E1,E2</c> are first and second exponents. <c>C</c> is the CRT coefficient.
- Terminology is taken from RFC 3447.</d>
- <v>Padding = rsa_pkcs1_padding | rsa_no_padding</v>
- <v>ChipherText = binary()</v>
+ <v>N = integer()</v>
</type>
<desc>
- <p>Encrypts the <c>PlainText</c> using the <c>PrivateKey</c>
- and returns the cipher. The <c>Padding</c> decides what padding mode is used,
- <c>rsa_pkcs1_padding</c> is PKCS #1 v1.5 currently the most
- used mode.
- The size of the <c>Msg</c> must be less than <c>byte_size(N)-11</c> if
- <c>rsa_pkcs1_padding</c> is used, and <c>byte_size(N)</c> if <c>rsa_no_padding</c>
- is used. Where byte_size(N) is the size part of an <c>Mpint-1</c>.
- </p>
+ <p>Generates N bytes randomly uniform 0..255, and returns the
+ result in a binary. Uses the <c>crypto</c> library pseudo-random
+ number generator.</p>
</desc>
</func>
- <func>
- <name>rsa_public_decrypt(ChipherText, PublicKey, Padding) -> PlainText</name>
- <fsummary>Decrypts ChipherText using the public Key.</fsummary>
+ <func>
+ <name>rand_uniform(Lo, Hi) -> N</name>
+ <fsummary>Generate a random number</fsummary>
<type>
- <v>ChipherText = binary()</v>
- <v>PublicKey = [E, N]</v>
- <v>E, N = Mpint</v>
- <d>Where <c>E</c> is the public exponent and <c>N</c> is public modulus</d>
- <v>Padding = rsa_pkcs1_padding | rsa_no_padding</v>
- <v>PlainText = binary()</v>
+ <v>Lo, Hi, N = integer()</v>
</type>
<desc>
- <p>Decrypts the <c>ChipherText</c> (encrypted with
- <seealso marker="#rsa_private_encrypt/3">rsa_private_encrypt/3</seealso>)
- using the <c>PrivateKey</c> and returns the
- message. The <c>Padding</c> is the padding mode that was
- used to encrypt the data,
- see <seealso marker="#rsa_private_encrypt/3">rsa_private_encrypt/3</seealso>.
- </p>
+ <p>Generate a random number <c><![CDATA[N, Lo =< N < Hi.]]></c> Uses the
+ <c>crypto</c> library pseudo-random number generator.
+ <c>Hi</c> must be larger than <c>Lo</c>.</p>
</desc>
</func>
-
+
<func>
- <name>dss_sign(DataOrDigest, Key) -> Signature</name>
- <name>dss_sign(DigestType, DataOrDigest, Key) -> Signature</name>
- <fsummary>Sign the data using dsa with given private key.</fsummary>
+ <name>sign(Algorithm, DigestType, Msg, Key) -> binary()</name>
+ <fsummary> Create digital signature.</fsummary>
<type>
- <v>DigestType = sha</v>
- <v>DataOrDigest = Mpint | {digest,Digest}</v>
- <v>Key = [P, Q, G, X]</v>
- <v>P, Q, G, X = Mpint</v>
- <d> Where <c>P</c>, <c>Q</c> and <c>G</c> are the dss
- parameters and <c>X</c> is the private key.</d>
- <v>Digest = binary() with length 20 bytes</v>
- <v>Signature = binary()</v>
+ <v>Algorithm = rsa | dss | ecdsa </v>
+ <v>Msg = binary() | {digest,binary()}</v>
+ <d>The msg is either the binary "plain text" data to be
+ signed or it is the hashed value of "plain text" i.e. the
+ digest.</d>
+ <v>DigestType = digest_type()</v>
+ <v>Key = rsa_private() | dss_private() | [ecdh_private(),ecdh_params()]</v>
</type>
<desc>
- <p>Creates a DSS signature with the private key <c>Key</c> of
- a digest. The digest is either calculated as a SHA1
- digest of <c>Data</c> or a precalculated binary <c>Digest</c>.</p>
- <p>A deprecated feature is having <c>DigestType = 'none'</c>
- in which case <c>DataOrDigest</c> is a precalculated SHA1
- digest.</p>
+ <p>Creates a digital signature.</p>
+ <p>Algorithm <c>dss</c> can only be used together with digest type
+ <c>sha</c>.</p>
+ See also <seealso marker="public_key:public_key#sign/3">public_key:sign/3</seealso>
</desc>
</func>
<func>
- <name>dss_verify(DataOrDigest, Signature, Key) -> Verified</name>
- <name>dss_verify(DigestType, DataOrDigest, Signature, Key) -> Verified</name>
- <fsummary>Verify the data and signature using dsa with given public key.</fsummary>
- <type>
- <v>Verified = boolean()</v>
- <v>DigestType = sha</v>
- <v>DataOrDigest = Mpint | {digest,Digest}</v>
- <v>Data = Mpint | ShaDigest</v>
- <v>Signature = Mpint</v>
- <v>Key = [P, Q, G, Y]</v>
- <v>P, Q, G, Y = Mpint</v>
- <d> Where <c>P</c>, <c>Q</c> and <c>G</c> are the dss
- parameters and <c>Y</c> is the public key.</d>
- <v>Digest = binary() with length 20 bytes</v>
- </type>
+ <name>start() -> ok</name>
+ <fsummary> Equivalent to application:start(crypto). </fsummary>
<desc>
- <p>Verifies that a digest matches the DSS signature using the
- public key <c>Key</c>. The digest is either calculated as a SHA1
- digest of <c>Data</c> or is a precalculated binary <c>Digest</c>.</p>
- <p>A deprecated feature is having <c>DigestType = 'none'</c>
- in which case <c>DataOrDigest</c> is a precalculated SHA1
- digest binary.</p>
+ <p> Equivalent to application:start(crypto).</p>
</desc>
</func>
-
<func>
- <name>rc2_cbc_encrypt(Key, IVec, Text) -> Cipher</name>
- <fsummary>Encrypt <c>Text</c>according to RC2 in CBC mode</fsummary>
- <type>
- <v>Key = Text = iolist() | binary()</v>
- <v>Ivec = Cipher = binary()</v>
- </type>
+ <name>stop() -> ok</name>
+ <fsummary> Equivalent to application:stop(crypto).</fsummary>
<desc>
- <p>Encrypts <c>Text</c> according to RC2 in CBC mode.</p>
+ <p> Equivalent to application:stop(crypto).</p>
</desc>
</func>
<func>
- <name>rc2_cbc_decrypt(Key, IVec, Cipher) -> Text</name>
- <fsummary>Decrypts <c>Cipher</c>according to RC2 in CBC mode</fsummary>
+ <name>strong_rand_bytes(N) -> binary()</name>
+ <fsummary>Generate a binary of random bytes</fsummary>
<type>
- <v>Key = Text = iolist() | binary()</v>
- <v>Ivec = Cipher = binary()</v>
+ <v>N = integer()</v>
</type>
<desc>
- <p>Decrypts <c>Cipher</c> according to RC2 in CBC mode.</p>
+ <p>Generates N bytes randomly uniform 0..255, and returns the
+ result in a binary. Uses a cryptographically secure prng seeded and
+ periodically mixed with operating system provided entropy. By default
+ this is the <c>RAND_bytes</c> method from OpenSSL.</p>
+ <p>May throw exception <c>low_entropy</c> in case the random generator
+ failed due to lack of secure "randomness".</p>
</desc>
</func>
-
<func>
- <name>rc4_encrypt(Key, Data) -> Result</name>
- <fsummary>Encrypt data using RC4</fsummary>
+ <name>stream_init(Type, Key) -> State</name>
+ <fsummary></fsummary>
<type>
- <v>Key, Data = iolist() | binary()</v>
- <v>Result = binary()</v>
+ <v>Type = rc4 </v>
+ <v>State = opaque() </v>
+ <v>Key = iodata()</v>
</type>
<desc>
- <p>Encrypts the data with RC4 symmetric stream encryption.
- Since it is symmetric, the same function is used for
- decryption.</p>
+ <p>Initializes the state for use in RC4 stream encryption
+ <seealso marker="#stream_encrypt/2">stream_encrypt</seealso> and
+ <seealso marker="#stream_decrypt/2">stream_decrypt</seealso></p>
</desc>
</func>
- <func>
- <name>dh_generate_key(DHParams) -> {PublicKey,PrivateKey} </name>
- <name>dh_generate_key(PrivateKey, DHParams) -> {PublicKey,PrivateKey} </name>
- <fsummary>Generates a Diffie-Hellman public key</fsummary>
+ <func>
+ <name>stream_init(Type, Key, IVec) -> State</name>
+ <fsummary></fsummary>
<type>
- <v>DHParameters = [P, G]</v>
- <v>P, G = Mpint</v>
- <d> Where <c>P</c> is the shared prime number and <c>G</c> is the shared generator.</d>
- <v>PublicKey, PrivateKey = Mpint()</v>
+ <v>Type = aes_ctr </v>
+ <v>State = opaque() </v>
+ <v>Key = iodata()</v>
+ <v>IVec = binary()</v>
</type>
<desc>
- <p>Generates a Diffie-Hellman <c>PublicKey</c> and <c>PrivateKey</c> (if not given).
- </p>
+ <p>Initializes the state for use in streaming AES encryption using Counter mode (CTR).
+ <c>Key</c> is the AES key and must be either 128, 192, or 256 bts long. <c>IVec</c> is
+ an arbitrary initializing vector of 128 bits (16 bytes). This state is for use with
+ <seealso marker="#stream_encrypt/2">stream_encrypt</seealso> and
+ <seealso marker="#stream_decrypt/2">stream_decrypt</seealso>.</p>
</desc>
</func>
<func>
- <name>dh_compute_key(OthersPublicKey, MyPrivateKey, DHParams) -> SharedSecret</name>
- <fsummary>Computes the shared secret</fsummary>
+ <name>stream_encrypt(State, PlainText) -> { NewState, CipherText}</name>
+ <fsummary></fsummary>
<type>
- <v>DHParameters = [P, G]</v>
- <v>P, G = Mpint</v>
- <d> Where <c>P</c> is the shared prime number and <c>G</c> is the shared generator.</d>
- <v>OthersPublicKey, MyPrivateKey = Mpint()</v>
- <v>SharedSecret = binary()</v>
+ <v>Text = iodata()</v>
+ <v>CipherText = binary()</v>
</type>
<desc>
- <p>Computes the shared secret from the private key and the other party's public key.
- </p>
+ <p>Encrypts <c>PlainText</c> according to the stream cipher <c>Type</c> specified in stream_init/3.
+ <c>Text</c> can be any number of bytes. The initial <c>State</c> is created using
+ <seealso marker="#stream_init/2">stream_init</seealso>.
+ <c>NewState</c> must be passed into the next call to <c>stream_encrypt</c>.</p>
</desc>
</func>
-
+
<func>
- <name>srp_generate_key(Generator, Prime, Version) -> {PublicKey, PrivateKey} </name>
- <name>srp_generate_key(Generator, Prime, Version, Private) -> {PublicKey, PrivateKey} </name>
- <name>srp_generate_key(Verifier, Generator, Prime, Version) -> {PublicKey, PrivateKey} </name>
- <name>srp_generate_key(Verifier, Generator, Prime, Version, Private) -> {PublicKey, PrivateKey} </name>
- <fsummary>Generates SRP public keys</fsummary>
+ <name>stream_decrypt(State, CipherText) -> { NewState, PlainText }</name>
+ <fsummary></fsummary>
<type>
- <v>Verifier = binary()</v>
- <d>Parameter v from <url href="http://srp.stanford.edu/design.html">SRP design</url>
- </d>
- <v>Generator = binary() </v>
- <d>Parameter g from <url href="http://srp.stanford.edu/design.html">SRP design</url>
- </d>
- <v>Prime = binary() </v>
- <d>Parameter N from <url href="http://srp.stanford.edu/design.html">SRP design</url>
- </d>
- <v>Version = '3' | '6' | '6a' </v>
- <d>SRP version, TLS SRP cipher suites uses '6a'.</d>
- <v>PublicKey = binary()</v>
- <d> Parameter A or B from <url href="http://srp.stanford.edu/design.html">SRP design</url></d>
- <v>Private = PrivateKey = binary() - generated if not supplied</v>
- <d>Parameter a or b from <url href="http://srp.stanford.edu/design.html">SRP design</url></d>
+ <v>CipherText = iodata()</v>
+ <v>PlainText = binary()</v>
</type>
<desc>
- <p>Generates SRP public keys for the client side (first argument is Generator)
- or for the server side (first argument is Verifier).</p>
+ <p>Decrypts <c>CipherText</c> according to the stream cipher <c>Type</c> specified in stream_init/3.
+ <c>PlainText</c> can be any number of bytes. The initial <c>State</c> is created using
+ <seealso marker="#stream_init/2">stream_init</seealso>.
+ <c>NewState</c> must be passed into the next call to <c>stream_encrypt</c>.</p>
</desc>
</func>
- <func>
- <name>srp_compute_key(DerivedKey, Prime, Generator,
- ClientPublic, ClientPrivate, ServerPublic, Version) -> SessionKey</name>
- <name>srp_compute_key(DerivedKey, Prime, Generator,
- ClientPublic, ClientPrivate, ServerPublic, Version, Scrambler) -> SessionKey</name>
- <name>srp_compute_key(Verifier, Prime,
- ClientPublic, ServerPublic, ServerPrivate, Version, Scrambler)-> SessionKey</name>
- <name>srp_compute_key(Verifier, Prime,
- ClientPublic, ServerPublic, ServerPrivate, Version) -> SessionKey</name>
-
- <fsummary>Computes SRP session key</fsummary>
+ <func>
+ <name>supports() -> AlgorithmList </name>
+ <fsummary>Provide a list of available crypto algorithms.</fsummary>
<type>
- <v>DerivedKey = binary()</v>
- <d>Parameter x from <url href="http://srp.stanford.edu/design.html">SRP design</url>
- </d>
- <v>Verifier = binary()</v>
- <d>Parameter v from <url href="http://srp.stanford.edu/design.html">SRP design</url>
- </d>
- <v>Prime = binary() </v>
- <d>Parameter N from <url href="http://srp.stanford.edu/design.html">SRP design</url>
- </d>
- <v>Generator = binary() </v>
- <d>Parameter g from <url href="http://srp.stanford.edu/design.html">SRP design</url>
- </d>
- <v>ClientPublic = binary() </v>
- <d>Parameter A from <url href="http://srp.stanford.edu/design.html">SRP design</url>
- </d>
- <v>ClientPrivate = binary() </v>
- <d>Parameter a from <url href="http://srp.stanford.edu/design.html">SRP design</url>
- </d>
- <v>ServerPublic = binary() </v>
- <d>Parameter B from <url href="http://srp.stanford.edu/design.html">SRP design</url>
- </d>
- <v>ServerPrivate = binary() </v>
- <d>Parameter b from <url href="http://srp.stanford.edu/design.html">SRP design</url>
- </d>
- <v>Version = '3' | '6' | '6a' </v>
- <d>SRP version, TLS SRP cipher suites uses '6a'.</d>
- <v>SessionKey = binary()</v>
- <d>Result K from <url href="http://srp.stanford.edu/design.html">SRP design</url>
- </d>
+ <v> AlgorithmList = [{hashs, [hash_algorithms()]},
+ {ciphers, [cipher_algorithms()]},
+ {public_keys, [public_key_algorithms()]}
+ </v>
</type>
<desc>
- <p>
- Computes the SRP session key (shared secret) for the client side (first argument is DerivedKey)
- or for the server side (first argument is Verifier). Also used
- as premaster secret by TLS-SRP cipher suites.
- </p>
+ <p> Can be used to determine which crypto algorithms that are supported
+ by the underlying OpenSSL library</p>
</desc>
</func>
+
- <func>
- <name>exor(Data1, Data2) -> Result</name>
- <fsummary>XOR data</fsummary>
- <type>
- <v>Data1, Data2 = iolist() | binary()</v>
- <v>Result = binary()</v>
- </type>
- <desc>
- <p>Performs bit-wise XOR (exclusive or) on the data supplied.</p>
+ <func>
+ <name>verify(Algorithm, DigestType, Msg, Signature, Key) -> boolean()</name>
+ <fsummary>Verifies a digital signature.</fsummary>
+ <type>
+ <v> Algorithm = rsa | dss | ecdsa </v>
+ <v>Msg = binary() | {digest,binary()}</v>
+ <d>The msg is either the binary "plain text" data
+ or it is the hashed value of "plain text" i.e. the digest.</d>
+ <v>DigestType = digest_type()</v>
+ <v>Signature = binary()</v>
+ <v>Key = rsa_public() | dss_public() | [ecdh_public(),ecdh_params()]</v>
+ </type>
+ <desc>
+ <p>Verifies a digital signature</p>
+ <p>Algorithm <c>dss</c> can only be used together with digest type
+ <c>sha</c>.</p>
+
+ See also <seealso marker="public_key:public_key#sign/3">public_key:verify/3</seealso>
</desc>
</func>
- </funcs>
- <section>
- <title>DES in CBC mode</title>
- <p>The Data Encryption Standard (DES) defines an algorithm for
- encrypting and decrypting an 8 byte quantity using an 8 byte key
- (actually only 56 bits of the key is used).
- </p>
- <p>When it comes to encrypting and decrypting blocks that are
- multiples of 8 bytes various modes are defined (NIST SP
- 800-38A). One of those modes is the Cipher Block Chaining (CBC)
- mode, where the encryption of an 8 byte segment depend not only
- of the contents of the segment itself, but also on the result of
- encrypting the previous segment: the encryption of the previous
- segment becomes the initializing vector of the encryption of the
- current segment.
- </p>
- <p>Thus the encryption of every segment depends on the encryption
- key (which is secret) and the encryption of the previous
- segment, except the first segment which has to be provided with
- an initial initializing vector. That vector could be chosen at
- random, or be a counter of some kind. It does not have to be
- secret.
- </p>
- <p>The following example is drawn from the old FIPS 81 standard
- (replaced by NIST SP 800-38A), where both the plain text and the
- resulting cipher text is settled. The following code fragment
- returns `true'.
- </p>
- <pre><![CDATA[
-
- Key = <<16#01,16#23,16#45,16#67,16#89,16#ab,16#cd,16#ef>>,
- IVec = <<16#12,16#34,16#56,16#78,16#90,16#ab,16#cd,16#ef>>,
- P = "Now is the time for all ",
- C = crypto:des_cbc_encrypt(Key, IVec, P),
- % Which is the same as
- P1 = "Now is t", P2 = "he time ", P3 = "for all ",
- C1 = crypto:des_cbc_encrypt(Key, IVec, P1),
- C2 = crypto:des_cbc_encrypt(Key, C1, P2),
- C3 = crypto:des_cbc_encrypt(Key, C2, P3),
-
- C = <<C1/binary, C2/binary, C3/binary>>,
- C = <<16#e5,16#c7,16#cd,16#de,16#87,16#2b,16#f2,16#7c,
- 16#43,16#e9,16#34,16#00,16#8c,16#38,16#9c,16#0f,
- 16#68,16#37,16#88,16#49,16#9a,16#7c,16#05,16#f6>>,
- <<"Now is the time for all ">> ==
- crypto:des_cbc_decrypt(Key, IVec, C).
- ]]></pre>
- <p>The following is true for the DES CBC mode. For all
- decompositions <c>P1 ++ P2 = P</c> of a plain text message
- <c>P</c> (where the length of all quantities are multiples of 8
- bytes), the encryption <c>C</c> of <c>P</c> is equal to <c>C1 ++
- C2</c>, where <c>C1</c> is obtained by encrypting <c>P1</c> with
- <c>Key</c> and the initializing vector <c>IVec</c>, and where
- <c>C2</c> is obtained by encrypting <c>P2</c> with <c>Key</c>
- and the initializing vector <c>last8(C1)</c>,
- where <c>last(Binary)</c> denotes the last 8 bytes of the
- binary <c>Binary</c>.
- </p>
- <p>Similarly, for all decompositions <c>C1 ++ C2 = C</c> of a
- cipher text message <c>C</c> (where the length of all quantities
- are multiples of 8 bytes), the decryption <c>P</c> of <c>C</c>
- is equal to <c>P1 ++ P2</c>, where <c>P1</c> is obtained by
- decrypting <c>C1</c> with <c>Key</c> and the initializing vector
- <c>IVec</c>, and where <c>P2</c> is obtained by decrypting
- <c>C2</c> with <c>Key</c> and the initializing vector
- <c>last8(C1)</c>, where <c>last8(Binary)</c> is as above.
- </p>
- <p>For DES3 (which uses three 64 bit keys) the situation is the
- same.
- </p>
- </section>
+ </funcs>
+
+ <!-- Maybe put this in the users guide -->
+ <!-- <section> -->
+ <!-- <title>DES in CBC mode</title> -->
+ <!-- <p>The Data Encryption Standard (DES) defines an algorithm for -->
+ <!-- encrypting and decrypting an 8 byte quantity using an 8 byte key -->
+ <!-- (actually only 56 bits of the key is used). -->
+ <!-- </p> -->
+ <!-- <p>When it comes to encrypting and decrypting blocks that are -->
+ <!-- multiples of 8 bytes various modes are defined (NIST SP -->
+ <!-- 800-38A). One of those modes is the Cipher Block Chaining (CBC) -->
+ <!-- mode, where the encryption of an 8 byte segment depend not only -->
+ <!-- of the contents of the segment itself, but also on the result of -->
+ <!-- encrypting the previous segment: the encryption of the previous -->
+ <!-- segment becomes the initializing vector of the encryption of the -->
+ <!-- current segment. -->
+ <!-- </p> -->
+ <!-- <p>Thus the encryption of every segment depends on the encryption -->
+ <!-- key (which is secret) and the encryption of the previous -->
+ <!-- segment, except the first segment which has to be provided with -->
+ <!-- an initial initializing vector. That vector could be chosen at -->
+ <!-- random, or be a counter of some kind. It does not have to be -->
+ <!-- secret. -->
+ <!-- </p> -->
+ <!-- <p>The following example is drawn from the old FIPS 81 standard -->
+ <!-- (replaced by NIST SP 800-38A), where both the plain text and the -->
+ <!-- resulting cipher text is settled. The following code fragment -->
+ <!-- returns `true'. -->
+ <!-- </p> -->
+ <!-- <pre><![CDATA[ -->
+
+ <!-- Key = <<16#01,16#23,16#45,16#67,16#89,16#ab,16#cd,16#ef>>, -->
+ <!-- IVec = <<16#12,16#34,16#56,16#78,16#90,16#ab,16#cd,16#ef>>, -->
+ <!-- P = "Now is the time for all ", -->
+ <!-- C = crypto:des_cbc_encrypt(Key, IVec, P), -->
+ <!-- % Which is the same as -->
+ <!-- P1 = "Now is t", P2 = "he time ", P3 = "for all ", -->
+ <!-- C1 = crypto:des_cbc_encrypt(Key, IVec, P1), -->
+ <!-- C2 = crypto:des_cbc_encrypt(Key, C1, P2), -->
+ <!-- C3 = crypto:des_cbc_encrypt(Key, C2, P3), -->
+
+ <!-- C = <<C1/binary, C2/binary, C3/binary>>, -->
+ <!-- C = <<16#e5,16#c7,16#cd,16#de,16#87,16#2b,16#f2,16#7c, -->
+ <!-- 16#43,16#e9,16#34,16#00,16#8c,16#38,16#9c,16#0f, -->
+ <!-- 16#68,16#37,16#88,16#49,16#9a,16#7c,16#05,16#f6>>, -->
+ <!-- <<"Now is the time for all ">> == -->
+ <!-- crypto:des_cbc_decrypt(Key, IVec, C). -->
+ <!-- ]]></pre> -->
+ <!-- <p>The following is true for the DES CBC mode. For all -->
+ <!-- decompositions <c>P1 ++ P2 = P</c> of a plain text message -->
+ <!-- <c>P</c> (where the length of all quantities are multiples of 8 -->
+ <!-- bytes), the encryption <c>C</c> of <c>P</c> is equal to <c>C1 ++ -->
+ <!-- C2</c>, where <c>C1</c> is obtained by encrypting <c>P1</c> with -->
+ <!-- <c>Key</c> and the initializing vector <c>IVec</c>, and where -->
+ <!-- <c>C2</c> is obtained by encrypting <c>P2</c> with <c>Key</c> -->
+ <!-- and the initializing vector <c>last8(C1)</c>, -->
+ <!-- where <c>last(Binary)</c> denotes the last 8 bytes of the -->
+ <!-- binary <c>Binary</c>. -->
+ <!-- </p> -->
+ <!-- <p>Similarly, for all decompositions <c>C1 ++ C2 = C</c> of a -->
+ <!-- cipher text message <c>C</c> (where the length of all quantities -->
+ <!-- are multiples of 8 bytes), the decryption <c>P</c> of <c>C</c> -->
+ <!-- is equal to <c>P1 ++ P2</c>, where <c>P1</c> is obtained by -->
+ <!-- decrypting <c>C1</c> with <c>Key</c> and the initializing vector -->
+ <!-- <c>IVec</c>, and where <c>P2</c> is obtained by decrypting -->
+ <!-- <c>C2</c> with <c>Key</c> and the initializing vector -->
+ <!-- <c>last8(C1)</c>, where <c>last8(Binary)</c> is as above. -->
+ <!-- </p> -->
+ <!-- <p>For DES3 (which uses three 64 bit keys) the situation is the -->
+ <!-- same. -->
+ <!-- </p> -->
+ <!-- </section> -->
</erlref>