diff options
Diffstat (limited to 'lib/crypto/doc/src/crypto.xml')
| -rw-r--r--[-rwxr-xr-x] | lib/crypto/doc/src/crypto.xml | 1548 |
1 files changed, 424 insertions, 1124 deletions
diff --git a/lib/crypto/doc/src/crypto.xml b/lib/crypto/doc/src/crypto.xml index 7eca4557d9..df765ade87 100755..100644 --- a/lib/crypto/doc/src/crypto.xml +++ b/lib/crypto/doc/src/crypto.xml @@ -22,263 +22,222 @@ </legalnotice> <title>crypto</title> - <prepared>Peter Högfeldt</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><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>dss_public() = [key_value()] =[P, Q, G, Y] </code></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><code>srp_params() = {user, [Generator::binary(), Prime::binary(), Version::atom()]} | + {host, [Verifier::binary(), Generator::binary(), Prime::binary(), Version::atom()]} + | {user, [DerivedKey::binary(), Prime::binary(), Generator::binary(), Version::atom() | [Scrambler:binary()]]} + | {host,[Verifier::binary(), Prime::binary(), Version::atom() | [Scrambler::binary]]} </code></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 genrated 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> message_digest_algorithms() = md5 | ripemd160 | sha | sha224 | sha256 | sha384 | sha512 </code> md4 is aslo supported for hash_init/1 and hash/2. + Note that both md4 and md5 are recommended only for compatibility with existing applications. + </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> + <name>algorithms() -> [message_digest_algorithms() | md4 | ec]</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> - <type> - <v>Name = binary()</v> - <v>VerNum = integer()</v> - <v>VerStr = 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> -[{<<"OpenSSL">>,9469983,<<"OpenSSL 0.9.8a 11 Oct 2005">>}] - </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> + <p> Can be used to determine if the crypto library has support for elliptic curve (ec) and + which message digest algorithms that are supported.</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> - </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> + + <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>Context = Digest = binary()</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>Encrypt <c>PlainText</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> + <name>block_decrypt(Type, Key, Ivec, CipherText) -> PlainText</name> + <fsummary>Decrypt <c>CipherText</c>according to <c>Type</c> block cipher</fsummary> <type> - <v>Data = iolist() | binary()</v> - <v>Digest = binary()</v> + <v>Key = block_key() </v> + <v>PlainText = iodata() </v> + <v>IVec = CipherText = binary()</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>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_init() -> Context</name> - <fsummary>Create an SHA context</fsummary> + <name>compute_key(Type, OthersPublicKey, MyPrivateKey, 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>MyPrivate = dh_private() | ecdh_private() | srp_private() </v> + <v>Params = dh_params() | edhc_params() | srp_params() </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> + + <func> + <name>generate_key(Type, Params) -> {PublicKey, PrivateKey} </name> + <name>generate_key(Type, Params, PrivateKey) -> {PublicKey, PrivateKey} </name> + <fsummary>Generates a public keys of type <c>Type</c></fsummary> <type> - <v>Context = Digest = binary()</v> + <v> Type = dh | ecdh | srp </v> + <v>Params = dh_params() | edhc_params() | srp_params() </v> + <v>PublicKey = dh_public() | ecdh_public() | srp_public() </v> + <v>PrivateKey = dh_private() | ecdh_private() | srp_private() </v> </type> <desc> - <p>Finishes the update of an SHA <c>Context</c> and returns - the computed <c>SHA</c> message digest.</p> + <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 +247,12 @@ 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 +262,7 @@ 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 +290,13 @@ 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 +308,13 @@ 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 +323,26 @@ 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 +354,7 @@ 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> @@ -423,705 +367,88 @@ 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() =< 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> - <type> - <v>Key = Text = iolist() | binary()</v> - <v>Cipher = 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> - </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> - <type> - <v>Key = Text = iolist() | binary()</v> - <v>IVec = Cipher = binary()</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> - </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> - </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>info_lib() -> [{Name,VerNum,VerStr}]</name> + <fsummary>Provides information about the libraries used by crypto.</fsummary> <type> - <v>Key = Text = iolist() | binary()</v> - <v>IVec = Cipher = binary()</v> + <v>Name = binary()</v> + <v>VerNum = integer()</v> + <v>VerStr = 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>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> +[{<<"OpenSSL">>,9469983,<<"OpenSSL 0.9.8a 11 Oct 2005">>}] + </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>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> + <name>mod_pow(N, P, M) -> Result</name> <fsummary>Computes the function: N^P mod M</fsummary> <type> - <v>N, P, M = binary()</v> + <v>N, P, M = binary() | integer()</v> <v>Result = binary() | error</v> </type> <desc> <p>Computes the function <c>N^P mod M</c>.</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> - <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> - </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> - </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> - <fsummary>Encrypts Msg using the public Key.</fsummary> - <type> - <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>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, - <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> - is used. - Where byte_size(N) is the size part of an <c>Mpint-1</c>. - </p> - </desc> + <name>next_iv(Type, Data) -> </name> + <fsummary></fsummary> + <type> + <v>Type = des_cbc | aes_cbc</v> + <v>Data = iodata()</v> + </type> + <desc> + <p>Returns the initialization vector to be used in the next + iteration of encrypt/decrypt of type <c>Type</c>. Data is the + encrypted data from the previous iteration step.</p> + </desc> </func> <func> - <name>rsa_private_decrypt(ChipherText, PrivateKey, Padding) -> PlainText</name> + <name>private_decrypt(Type, ChipherText, PrivateKey, Padding) -> PlainText</name> <fsummary>Decrypts ChipherText using the private Key.</fsummary> <type> + <v>Type = rsa</v> <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>PrivateKey = rsa_private()</v> <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>) + <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="#rsa_public_encrypt/3">rsa_public_encrypt/3</seealso>. + 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>rsa_private_encrypt(PlainText, PrivateKey, Padding) -> ChipherText</name> + <name>private_encrypt(Type, PlainText, PrivateKey, Padding) -> ChipherText</name> <fsummary>Encrypts Msg using the private Key.</fsummary> <type> + <v>Type = rsa</v> <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>PrivateKey = rsa_private()</v> <v>Padding = rsa_pkcs1_padding | rsa_no_padding</v> <v>ChipherText = binary()</v> </type> @@ -1131,316 +458,289 @@ Mpint() = <![CDATA[<<ByteLen:32/integer-big, Bytes:ByteLen/binary>>]]> <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>. + <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_public_decrypt(ChipherText, PublicKey, Padding) -> PlainText</name> + <name>public_decrypt(Type, ChipherText, PublicKey, Padding) -> PlainText</name> <fsummary>Decrypts ChipherText using the public Key.</fsummary> <type> + <v>Type = rsa</v> <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>PublicKey = rsa_public() </v> <v>Padding = rsa_pkcs1_padding | rsa_no_padding</v> <v>PlainText = binary()</v> </type> <desc> - <p>Decrypts the <c>ChipherText</c> (encrypted with - <seealso marker="#rsa_private_encrypt/3">rsa_private_encrypt/3</seealso>) + <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="#rsa_private_encrypt/3">rsa_private_encrypt/3</seealso>. + 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>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>public_encrypt(Type, PlainText, PublicKey, Padding) -> ChipherText</name> + <fsummary>Encrypts Msg using the public Key.</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>Type = rsa</v> + <v>PlainText = binary()</v> + <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>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>Encrypts the <c>PlainText</c> (usually a session key) using the <c>PublicKey</c> + 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> + is used. + See also <seealso marker="public_key:public_key#encrypt_public/2">public_key:encrypt_public/[2,3]</seealso> + </p> </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> + <name>rand_bytes(N) -> binary()</name> + <fsummary>Generate a binary of random bytes</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> + <v>N = integer()</v> </type> <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>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>rc2_cbc_encrypt(Key, IVec, Text) -> Cipher</name> - <fsummary>Encrypt <c>Text</c>according to RC2 in CBC mode</fsummary> + <func> + <name>rand_uniform(Lo, Hi) -> N</name> + <fsummary>Generate a random number</fsummary> <type> - <v>Key = Text = iolist() | binary()</v> - <v>Ivec = Cipher = binary()</v> + <v>Lo, Hi, N = integer()</v> </type> <desc> - <p>Encrypts <c>Text</c> according to RC2 in CBC mode.</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>rc2_cbc_decrypt(Key, IVec, Cipher) -> Text</name> - <fsummary>Decrypts <c>Cipher</c>according to RC2 in CBC mode</fsummary> + <name>sign(Algorithm, DigestType, Msg, Key) -> binary()</name> + <fsummary> Create digital signature.</fsummary> <type> - <v>Key = Text = iolist() | binary()</v> - <v>Ivec = Cipher = 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_key() | dsa_private_key() | ec_private_key()</v> </type> <desc> - <p>Decrypts <c>Cipher</c> according to RC2 in CBC mode.</p> + <p> Creates a digital signature.</p> + See also <seealso marker="public_key:public_key#sign/3">public_key:sign/3</seealso> </desc> </func> - + <func> - <name>rc4_encrypt(Key, Data) -> Result</name> - <fsummary>Encrypt data using RC4</fsummary> + <name>start() -> ok</name> + <fsummary> Equivalent to application:start(crypto). </fsummary> + <desc> + <p> Equivalent to application:start(crypto).</p> + </desc> + </func> + <func> + <name>stop() -> ok</name> + <fsummary> Equivalent to application:stop(crypto).</fsummary> + <desc> + <p> Equivalent to application:stop(crypto).</p> + </desc> + </func> + + <func> + <name>strong_rand_bytes(N) -> binary()</name> + <fsummary>Generate a binary of random bytes</fsummary> <type> - <v>Key, Data = iolist() | binary()</v> - <v>Result = binary()</v> + <v>N = integer()</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>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>dh_generate_key(DHParams) -> {PublicKey,PrivateKey} </name> - <name>dh_generate_key(PrivateKey, DHParams) -> {PublicKey,PrivateKey} </name> - <fsummary>Generates a Diffie-Hellman public key</fsummary> + <name>stream_init(Type, Key) -> 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 rc4 </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 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_compute_key(OthersPublicKey, MyPrivateKey, DHParams) -> SharedSecret</name> - <fsummary>Computes the shared secret</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>OthersPublicKey, MyPrivateKey = Mpint()</v> - <v>SharedSecret = binary()</v> + <v>Type aes_ctr </v> + <v>State = opaque() </v> + <v>Key = iodata()</v> + <v>IVec = binary()</v> </type> <desc> - <p>Computes the shared secret from the private key and the other party's public key. - </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>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_encrypt(State, PlainText) -> { NewState, CipherText}</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>Text = iodata()</v> + <v>CipherText = 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>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_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> + <name>stream_decrypt(State, CipherText) -> { NewState, PlainText }</name> + <fsummary></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>CipherText = iodata()</v> + <v>PlainText = binary()</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>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>exor(Data1, Data2) -> Result</name> - <fsummary>XOR data</fsummary> + + <func> + <name>verify(Algorithm, DigestType, Msg, Signature, Key) -> boolean()</name> + <fsummary>Verifies a digital signature.</fsummary> <type> - <v>Data1, Data2 = iolist() | binary()</v> - <v>Result = binary()</v> + <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_key() | dsa_public_key() | ec_public_key()</v> </type> <desc> - <p>Performs bit-wise XOR (exclusive or) on the data supplied.</p> + <p>Verifies a digital signature</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> |