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Diffstat (limited to 'lib/crypto/doc/src/crypto.xml')
| -rw-r--r-- | lib/crypto/doc/src/crypto.xml | 405 |
1 files changed, 359 insertions, 46 deletions
diff --git a/lib/crypto/doc/src/crypto.xml b/lib/crypto/doc/src/crypto.xml index 82e450ec21..464799b320 100644 --- a/lib/crypto/doc/src/crypto.xml +++ b/lib/crypto/doc/src/crypto.xml @@ -11,7 +11,7 @@ Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at - + http://www.apache.org/licenses/LICENSE-2.0 Unless required by applicable law or agreed to in writing, software @@ -19,7 +19,6 @@ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License. - </legalnotice> <title>crypto</title> @@ -41,6 +40,9 @@ <p>Hmac functions - <url href="http://www.ietf.org/rfc/rfc2104.txt"> Keyed-Hashing for Message Authentication (RFC 2104) </url></p> </item> <item> + <p>Cmac functions - <url href="http://www.ietf.org/rfc/rfc4493.txt">The AES-CMAC Algorithm (RFC 4493)</url></p> + </item> + <item> <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, CTR and GCM </url></p> </item> @@ -65,16 +67,16 @@ <section> <title>DATA TYPES </title> - - <code>key_value() = integer() | binary() </code> + + <code>key_value() = integer() | binary() </code> <p>Always <c>binary()</c> when used as return value</p> - <code>rsa_public() = [key_value()] = [E, N] </code> + <code>rsa_public() = [key_value()] = [E, N] </code> <p> Where E is the public exponent and N is public modulus. </p> <code>rsa_private() = [key_value()] = [E, N, D] | [E, N, D, P1, P2, E1, E2, C] </code> <p>Where E is the public exponent, N is public modulus and D is - the private exponent.The longer key format contains redundant + 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> @@ -82,7 +84,7 @@ <code>dss_public() = [key_value()] = [P, Q, G, Y] </code> <p>Where P, Q and G are the dss parameters and Y is the public key.</p> - <code>dss_private() = [key_value()] = [P, Q, G, X] </code> + <code>dss_private() = [key_value()] = [P, Q, G, X] </code> <p>Where P, Q and G are the dss parameters and X is the private key.</p> <code>srp_public() = key_value() </code> @@ -106,15 +108,16 @@ <code>ecdh_private() = key_value() </code> - <code>ecdh_params() = ec_named_curve() | ec_explicit_curve()</code> + <code>ecdh_params() = ec_named_curve() | ec_explicit_curve()</code> <code>ec_explicit_curve() = - {ec_field(), Prime :: key_value(), Point :: key_value(), Order :: integer(), CoFactor :: none | integer()} </code> + {ec_field(), Prime :: key_value(), Point :: key_value(), Order :: integer(), + CoFactor :: none | integer()} </code> <code>ec_field() = {prime_field, Prime :: integer()} | {characteristic_two_field, M :: integer(), Basis :: ec_basis()}</code> - <code>ec_basis() = {tpbasis, K :: non_neg_integer()} | + <code>ec_basis() = {tpbasis, K :: non_neg_integer()} | {ppbasis, K1 :: non_neg_integer(), K2 :: non_neg_integer(), K3 :: non_neg_integer()} | onbasis</code> @@ -133,16 +136,34 @@ See also <seealso marker="#supports-0">crypto:supports/0</seealso> </p> + <marker id="engine_key_ref_type"/> + <code>engine_key_ref() = #{engine := engine_ref(), + key_id := key_id(), + password => password()}</code> + + <code>engine_ref() = term()</code> + <p>The result of a call to <seealso marker="#engine_load-3">engine_load/3</seealso>. + </p> + + <code>key_id() = string() | binary()</code> + <p>Identifies the key to be used. The format depends on the loaded engine. It is passed to + the <c>ENGINE_load_(private|public)_key</c> functions in libcrypto. + </p> + + <code>password() = string() | binary()</code> + <p>The key's password + </p> + <code>stream_cipher() = rc4 | aes_ctr </code> - <code>block_cipher() = aes_cbc | aes_cfb8 | aes_cfb128 | aes_ige256 | blowfish_cbc | + <code>block_cipher() = aes_cbc | aes_cfb8 | aes_cfb128 | aes_ige256 | blowfish_cbc | blowfish_cfb64 | des_cbc | des_cfb | des3_cbc | des3_cfb | des_ede3 | rc2_cbc </code> - <code>aead_cipher() = aes_gcm | chacha20_poly1305 </code> + <code>aead_cipher() = aes_gcm | chacha20_poly1305 </code> - <code>stream_key() = aes_key() | rc4_key() </code> + <code>stream_key() = aes_key() | rc4_key() </code> - <code>block_key() = aes_key() | blowfish_key() | des_key()| des3_key() </code> + <code>block_key() = aes_key() | blowfish_key() | des_key()| des3_key() </code> <code>aes_key() = iodata() </code> <p>Key length is 128, 192 or 256 bits</p> @@ -156,16 +177,32 @@ <code>digest_type() = md5 | sha | sha224 | sha256 | sha384 | sha512</code> + <code>rsa_digest_type() = md5 | ripemd160 | sha | sha224 | sha256 | sha384 | sha512</code> + + <code>dss_digest_type() = sha | sha224 | sha256 | sha384 | sha512</code> <p>Note that the actual supported + dss_digest_type depends on the underlying crypto library. In OpenSSL version >= 1.0.1 the listed digest are supported, while in 1.0.0 only sha, sha224 and sha256 are supported. In version 0.9.8 only sha is supported.</p> + + <code>ecdsa_digest_type() = sha | sha224 | sha256 | sha384 | sha512</code> + + <code>sign_options() = [{rsa_pad, rsa_sign_padding()} | {rsa_pss_saltlen, integer()}]</code> + + <code>rsa_sign_padding() = rsa_pkcs1_padding | rsa_pkcs1_pss_padding</code> + <code> hash_algorithms() = md5 | ripemd160 | sha | sha224 | sha256 | sha384 | sha512 </code> <p>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> <code> cipher_algorithms() = aes_cbc | aes_cfb8 | aes_cfb128 | aes_ctr | aes_gcm | - aes_ige256 | blowfish_cbc | blowfish_cfb64 | chacha20_poly1305 | des_cbc | des_cfb | - des3_cbc | des3_cfb | des_ede3 | rc2_cbc | rc4 </code> - <code> public_key_algorithms() = rsa |dss | ecdsa | dh | ecdh | ec_gf2m</code> + aes_ige256 | blowfish_cbc | blowfish_cfb64 | chacha20_poly1305 | des_cbc | + des_cfb | des3_cbc | des3_cfb | des_ede3 | rc2_cbc | rc4 </code> + <code> mac_algorithms() = hmac | cmac</code> + <code> public_key_algorithms() = rsa |dss | ecdsa | dh | ecdh | ec_gf2m</code> <p>Note that ec_gf2m is not strictly a public key algorithm, but a restriction on what curves are supported with ecdsa and ecdh. </p> + <code>engine_method_type() = engine_method_rsa | engine_method_dsa | engine_method_dh | + engine_method_rand | engine_method_ecdh | engine_method_ecdsa | + engine_method_ciphers | engine_method_digests | engine_method_store | + engine_method_pkey_meths | engine_method_pkey_asn1_meths</code> </section> @@ -246,13 +283,13 @@ is not supported by the underlying OpenSSL implementation.</p> </desc> </func> - + <func> <name>bytes_to_integer(Bin) -> Integer </name> <fsummary>Convert binary representation, of an integer, to an Erlang integer.</fsummary> <type> <v>Bin = binary() - as returned by crypto functions</v> - + <v>Integer = integer() </v> </type> <desc> @@ -295,22 +332,32 @@ <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> + <fsummary>Generates a public key of type <c>Type</c></fsummary> <type> - <v> Type = dh | ecdh | srp </v> - <v>Params = dh_params() | ecdh_params() | SrpUserParams | SrpHostParams </v> + <v> Type = dh | ecdh | rsa | srp </v> + <v>Params = dh_params() | ecdh_params() | RsaParams | SrpUserParams | SrpHostParams </v> + <v>RsaParams = {ModulusSizeInBits::integer(), PublicExponent::key_value()}</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>PublicKey = dh_public() | ecdh_public() | rsa_public() | srp_public() </v> <v>PrivKeyIn = undefined | dh_private() | ecdh_private() | srp_private() </v> - <v>PrivKeyOut = dh_private() | ecdh_private() | srp_private() </v> + <v>PrivKeyOut = dh_private() | ecdh_private() | rsa_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> - May throw exception <c>low_entropy</c> in case the random generator - failed due to lack of secure "randomness". - </p> + <p>Generates a public key of type <c>Type</c>. + See also <seealso marker="public_key:public_key#generate_key-1">public_key:generate_key/1</seealso>. + May throw exception an exception of class <c>error</c>: + </p> + <list type="bulleted"> + <item><c>badarg</c>: an argument is of wrong type or has an illegal value,</item> + <item><c>low_entropy</c>: the random generator failed due to lack of secure "randomness",</item> + <item><c>computation_failed</c>: the computation fails of another reason than <c>low_entropy</c>.</item> + </list> + <note> + <p>RSA key generation is only available if the runtime was + built with dirty scheduler support. Otherwise, attempting to + generate an RSA key will throw exception <c>error:notsup</c>.</p> + </note> </desc> </func> @@ -414,7 +461,7 @@ </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 + 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> or to one of the functions <seealso marker="#hmac_final-1">hmac_final</seealso> and @@ -454,6 +501,46 @@ </func> <func> + <name>cmac(Type, Key, Data) -> Mac</name> + <name>cmac(Type, Key, Data, MacLength) -> Mac</name> + <fsummary>Calculates the Cipher-based Message Authentication Code.</fsummary> + <type> + <v>Type = block_cipher()</v> + <v>Key = iodata()</v> + <v>Data = iodata()</v> + <v>MacLength = integer()</v> + <v>Mac = binary()</v> + </type> + <desc> + <p>Computes a CMAC of type <c>Type</c> from <c>Data</c> using + <c>Key</c> as the authentication key.</p> <p><c>MacLength</c> + will limit the size of the resultant <c>Mac</c>.</p> + </desc> + </func> + + <func> + <name>info_fips() -> Status</name> + <fsummary>Provides information about the FIPS operating status.</fsummary> + <type> + <v>Status = enabled | not_enabled | not_supported</v> + </type> + <desc> + <p>Provides information about the FIPS operating status of + crypto and the underlying OpenSSL library. If crypto was built + with FIPS support this can be either <c>enabled</c> (when + running in FIPS mode) or <c>not_enabled</c>. For other builds + this value is always <c>not_supported</c>.</p> + <warning> + <p>In FIPS mode all non-FIPS compliant algorithms are + disabled and throw exception <c>not_supported</c>. Check + <seealso marker="#supports-0">supports</seealso> that in + FIPS mode returns the restricted list of available + algorithms.</p> + </warning> + </desc> + </func> + + <func> <name>info_lib() -> [{Name,VerNum,VerStr}]</name> <fsummary>Provides information about the libraries used by crypto.</fsummary> <type> @@ -468,7 +555,7 @@ 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">>}] +[{<<"OpenSSL">>,269484095,<<"OpenSSL 1.1.0c 10 Nov 2016"">>}] </pre> <note><p> From OTP R16 the <em>numeric version</em> represents the version of the OpenSSL @@ -515,7 +602,7 @@ <type> <v>Type = rsa</v> <v>CipherText = binary()</v> - <v>PrivateKey = rsa_private()</v> + <v>PrivateKey = rsa_private() | engine_key_ref()</v> <v>Padding = rsa_pkcs1_padding | rsa_pkcs1_oaep_padding | rsa_no_padding</v> <v>PlainText = binary()</v> </type> @@ -529,7 +616,22 @@ </p> </desc> </func> - + + <func> + <name>privkey_to_pubkey(Type, EnginePrivateKeyRef) -> PublicKey</name> + <fsummary>Fetches a public key from an Engine stored private key.</fsummary> + <type> + <v>Type = rsa | dss</v> + <v>EnginePrivateKeyRef = engine_key_ref()</v> + <v>PublicKey = rsa_public() | dss_public()</v> + </type> + <desc> + <p>Fetches the corresponding public key from a private key stored in an Engine. + The key must be of the type indicated by the Type parameter. + </p> + </desc> + </func> + <func> <name>private_encrypt(Type, PlainText, PrivateKey, Padding) -> CipherText</name> <fsummary>Encrypts PlainText using the private Key.</fsummary> @@ -540,7 +642,7 @@ 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 N is public modulus of the RSA key.</d> - <v>PrivateKey = rsa_private()</v> + <v>PrivateKey = rsa_private() | engine_key_ref()</v> <v>Padding = rsa_pkcs1_padding | rsa_no_padding</v> <v>CipherText = binary()</v> </type> @@ -559,7 +661,7 @@ <type> <v>Type = rsa</v> <v>CipherText = binary()</v> - <v>PublicKey = rsa_public() </v> + <v>PublicKey = rsa_public() | engine_key_ref()</v> <v>Padding = rsa_pkcs1_padding | rsa_no_padding</v> <v>PlainText = binary()</v> </type> @@ -584,7 +686,7 @@ 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 N is public modulus of the RSA key.</d> - <v>PublicKey = rsa_public()</v> + <v>PublicKey = rsa_public() | engine_key_ref()</v> <v>Padding = rsa_pkcs1_padding | rsa_pkcs1_oaep_padding | rsa_no_padding</v> <v>CipherText = binary()</v> </type> @@ -605,10 +707,11 @@ </type> <desc> <p>Set the seed for PRNG to the given binary. This calls the - RAND_seed function from openssl. Only use this if the system - you are running on does not have enough "randomness" built in. - Normally this is when <seealso marker="#strong_rand_bytes/1"> - strong_rand_bytes/1</seealso> returns <c>low_entropy</c></p> + RAND_seed function from openssl. Only use this if the system + you are running on does not have enough "randomness" built in. + Normally this is when + <seealso marker="#strong_rand_bytes/1">strong_rand_bytes/1</seealso> + throws <c>low_entropy</c></p> </desc> </func> @@ -627,6 +730,7 @@ <func> <name>sign(Algorithm, DigestType, Msg, Key) -> binary()</name> + <name>sign(Algorithm, DigestType, Msg, Key, Options) -> binary()</name> <fsummary> Create digital signature.</fsummary> <type> <v>Algorithm = rsa | dss | ecdsa </v> @@ -634,8 +738,9 @@ <d>The msg is either the binary "cleartext" data to be signed or it is the hashed value of "cleartext" i.e. the digest (plaintext).</d> - <v>DigestType = digest_type()</v> - <v>Key = rsa_private() | dss_private() | [ecdh_private(),ecdh_params()]</v> + <v>DigestType = rsa_digest_type() | dss_digest_type() | ecdsa_digest_type()</v> + <v>Key = rsa_private() | dss_private() | [ecdh_private(),ecdh_params()] | engine_key_ref()</v> + <v>Options = sign_options()</v> </type> <desc> <p>Creates a digital signature.</p> @@ -675,6 +780,43 @@ failed due to lack of secure "randomness".</p> </desc> </func> + + <func> + <name>rand_seed() -> rand:state()</name> + <fsummary>Strong random number generation plugin state</fsummary> + <desc> + <p> + Creates state object for + <seealso marker="stdlib:rand">random number generation</seealso>, + in order to generate cryptographically strong random numbers + (based on OpenSSL's <c>BN_rand_range</c>), + and saves it on process dictionary before returning it as well. + See also + <seealso marker="stdlib:rand#seed-1">rand:seed/1</seealso>. + </p> + <p><em>Example</em></p> + <pre> +_ = crypto:rand_seed(), +_IntegerValue = rand:uniform(42), % [1; 42] +_FloatValue = rand:uniform(). % [0.0; 1.0[</pre> + </desc> + </func> + + <func> + <name>rand_seed_s() -> rand:state()</name> + <fsummary>Strong random number generation plugin state</fsummary> + <desc> + <p> + Creates state object for + <seealso marker="stdlib:rand">random number generation</seealso>, + in order to generate cryptographically strongly random numbers + (based on OpenSSL's <c>BN_rand_range</c>). + See also + <seealso marker="stdlib:rand#seed_s-1">rand:seed_s/1</seealso>. + </p> + </desc> + </func> + <func> <name>stream_init(Type, Key) -> State</name> <fsummary></fsummary> @@ -744,7 +886,8 @@ <type> <v> AlgorithmList = [{hashs, [hash_algorithms()]}, {ciphers, [cipher_algorithms()]}, - {public_keys, [public_key_algorithms()]} + {public_keys, [public_key_algorithms()]}, + {macs, [mac_algorithms()]}] </v> </type> <desc> @@ -778,15 +921,17 @@ <func> <name>verify(Algorithm, DigestType, Msg, Signature, Key) -> boolean()</name> + <name>verify(Algorithm, DigestType, Msg, Signature, Key, Options) -> 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 "cleartext" data or it is the hashed value of "cleartext" i.e. the digest (plaintext).</d> - <v>DigestType = digest_type()</v> + <v>DigestType = rsa_digest_type() | dss_digest_type() | ecdsa_digest_type()</v> <v>Signature = binary()</v> - <v>Key = rsa_public() | dss_public() | [ecdh_public(),ecdh_params()]</v> + <v>Key = rsa_public() | dss_public() | [ecdh_public(),ecdh_params()] | engine_key_ref()</v> + <v>Options = sign_options()</v> </type> <desc> <p>Verifies a digital signature</p> @@ -797,6 +942,175 @@ </desc> </func> + <!-- Engine functions --> + <func> + <name>engine_get_all_methods() -> Result</name> + <fsummary>Return list of all possible engine methods</fsummary> + <type> + <v>Result = [EngineMethod::atom()]</v> + </type> + <desc> + <p> + Returns a list of all possible engine methods. + </p> + <p> + May throw exception notsup in case there is + no engine support in the underlying OpenSSL implementation. + </p> + <p> + See also the chapter <seealso marker="crypto:engine_load#engine_load">Engine Load</seealso> + in the User's Guide. + </p> + </desc> + </func> + + <func> + <name>engine_load(EngineId, PreCmds, PostCmds) -> Result</name> + <fsummary>Dynamical load an encryption engine</fsummary> + <type> + <v>EngineId = unicode:chardata()</v> + <v>PreCmds, PostCmds = [{unicode:chardata(), unicode:chardata()}]</v> + <v>Result = {ok, Engine::term()} | {error, Reason::term()}</v> + </type> + <desc> + <p> + Loads the OpenSSL engine given by <c>EngineId</c> if it is available and then returns ok and + an engine handle. This function is the same as calling <c>engine_load/4</c> with + <c>EngineMethods</c> set to a list of all the possible methods. An error tuple is + returned if the engine can't be loaded. + </p> + <p> + The function throws a badarg if the parameters are in wrong format. + It may also throw the exception notsup in case there is + no engine support in the underlying OpenSSL implementation. + </p> + <p> + See also the chapter <seealso marker="crypto:engine_load#engine_load">Engine Load</seealso> + in the User's Guide. + </p> + </desc> + </func> + + <func> + <name>engine_load(EngineId, PreCmds, PostCmds, EngineMethods) -> Result</name> + <fsummary>Dynamical load an encryption engine</fsummary> + <type> + <v>EngineId = unicode:chardata()</v> + <v>PreCmds, PostCmds = [{unicode:chardata(), unicode:chardata()}]</v> + <v>EngineMethods = [engine_method_type()]</v> + <v>Result = {ok, Engine::term()} | {error, Reason::term()}</v> + </type> + <desc> + <p> + Loads the OpenSSL engine given by <c>EngineId</c> if it is available and then returns ok and + an engine handle. An error tuple is returned if the engine can't be loaded. + </p> + <p> + The function throws a badarg if the parameters are in wrong format. + It may also throw the exception notsup in case there is + no engine support in the underlying OpenSSL implementation. + </p> + <p> + See also the chapter <seealso marker="crypto:engine_load#engine_load">Engine Load</seealso> + in the User's Guide. + </p> + </desc> + </func> + + <func> + <name>engine_unload(Engine) -> Result</name> + <fsummary>Dynamical load an encryption engine</fsummary> + <type> + <v>Engine = term()</v> + <v>Result = ok | {error, Reason::term()}</v> + </type> + <desc> + <p> + Unloads the OpenSSL engine given by <c>EngineId</c>. + An error tuple is returned if the engine can't be unloaded. + </p> + <p> + The function throws a badarg if the parameter is in wrong format. + It may also throw the exception notsup in case there is + no engine support in the underlying OpenSSL implementation. + </p> + <p> + See also the chapter <seealso marker="crypto:engine_load#engine_load">Engine Load</seealso> + in the User's Guide. + </p> + </desc> + </func> + + <func> + <name>engine_list() -> Result</name> + <fsummary>List the known engine ids</fsummary> + <type> + <v>Result = [EngineId::unicode:chardata()]</v> + </type> + <desc> + <p>List the id's of all engines in OpenSSL's internal list.</p> + <p> + It may also throw the exception notsup in case there is + no engine support in the underlying OpenSSL implementation. + </p> + <p> + See also the chapter <seealso marker="crypto:engine_load#engine_load">Engine Load</seealso> + in the User's Guide. + </p> + </desc> + </func> + + <func> + <name>engine_ctrl_cmd_string(Engine, CmdName, CmdArg) -> Result</name> + <fsummary>Sends ctrl commands to an OpenSSL engine</fsummary> + <type> + <v>Engine = term()</v> + <v>CmdName = unicode:chardata()</v> + <v>CmdArg = unicode:chardata()</v> + <v>Result = ok | {error, Reason::term()}</v> + </type> + <desc> + <p> + Sends ctrl commands to the OpenSSL engine given by <c>Engine</c>. + This function is the same as calling <c>engine_ctrl_cmd_string/4</c> with + <c>Optional</c> set to <c>false</c>. + </p> + <p> + The function throws a badarg if the parameters are in wrong format. + It may also throw the exception notsup in case there is + no engine support in the underlying OpenSSL implementation. + </p> + </desc> + </func> + + <func> + <name>engine_ctrl_cmd_string(Engine, CmdName, CmdArg, Optional) -> Result</name> + <fsummary>Sends ctrl commands to an OpenSSL engine</fsummary> + <type> + <v>Engine = term()</v> + <v>CmdName = unicode:chardata()</v> + <v>CmdArg = unicode:chardata()</v> + <v>Optional = boolean()</v> + <v>Result = ok | {error, Reason::term()}</v> + </type> + <desc> + <p> + Sends ctrl commands to the OpenSSL engine given by <c>Engine</c>. + <c>Optional</c> is a boolean argument that can relax the semantics of the function. + If set to <c>true</c> it will only return failure if the ENGINE supported the given + command name but failed while executing it, if the ENGINE doesn't support the command + name it will simply return success without doing anything. In this case we assume + the user is only supplying commands specific to the given ENGINE so we set this to + <c>false</c>. + </p> + <p> + The function throws a badarg if the parameters are in wrong format. + It may also throw the exception notsup in case there is + no engine support in the underlying OpenSSL implementation. + </p> + </desc> + </func> + </funcs> <!-- Maybe put this in the users guide --> @@ -871,4 +1185,3 @@ <!-- </p> --> <!-- </section> --> </erlref> - |