| crypto(3erl) | Erlang Module Definition | crypto(3erl) |
crypto - Crypto Functions
This module provides a set of cryptographic functions.
Enabling FIPS mode will also disable algorithms and features.
The CRYPTO User's Guide has more information on FIPS, Engines and Algorithm Details like key lengths.
stream_cipher() = rc4 | aes_ctr | chacha20
Stream ciphers for stream_encrypt/2 and stream_decrypt/2 .
block_cipher_with_iv() =
cbc_cipher() |
cfb_cipher() |
aes_cbc128 |
aes_cbc256 |
aes_ige256 |
blowfish_ofb64 |
des3_cbf |
des_ede3 |
rc2_cbc
cbc_cipher() = des_cbc | des3_cbc | aes_cbc | blowfish_cbc
cfb_cipher() =
aes_cfb128 | aes_cfb8 | blowfish_cfb64 | des3_cfb | des_cfb
Block ciphers with initialization vector for block_encrypt/4 and block_decrypt/4 .
block_cipher_without_iv() = ecb_cipher()
ecb_cipher() = des_ecb | blowfish_ecb | aes_ecb
Block ciphers without initialization vector for block_encrypt/3 and block_decrypt/3 .
aead_cipher() = aes_gcm | aes_ccm | chacha20_poly1305
Ciphers with simultaneous MAC-calculation or MAC-checking. block_encrypt/4 and block_decrypt/4 .
sha1() = sha
sha2() = sha224 | sha256 | sha384 | sha512
sha3() = sha3_224 | sha3_256 | sha3_384 | sha3_512
compatibility_only_hash() = md5 | md4
The compatibility_only_hash() algorithms are recommended only for compatibility with existing applications.
rsa_digest_type() = sha1() | sha2() | md5 | ripemd160
dss_digest_type() = sha1() | sha2()
ecdsa_digest_type() = sha1() | sha2()
ec_named_curve() =
brainpoolP160r1 |
brainpoolP160t1 |
brainpoolP192r1 |
brainpoolP192t1 |
brainpoolP224r1 |
brainpoolP224t1 |
brainpoolP256r1 |
brainpoolP256t1 |
brainpoolP320r1 |
brainpoolP320t1 |
brainpoolP384r1 |
brainpoolP384t1 |
brainpoolP512r1 |
brainpoolP512t1 |
c2pnb163v1 |
c2pnb163v2 |
c2pnb163v3 |
c2pnb176v1 |
c2pnb208w1 |
c2pnb272w1 |
c2pnb304w1 |
c2pnb368w1 |
c2tnb191v1 |
c2tnb191v2 |
c2tnb191v3 |
c2tnb239v1 |
c2tnb239v2 |
c2tnb239v3 |
c2tnb359v1 |
c2tnb431r1 |
ipsec3 |
ipsec4 |
prime192v1 |
prime192v2 |
prime192v3 |
prime239v1 |
prime239v2 |
prime239v3 |
prime256v1 |
secp112r1 |
secp112r2 |
secp128r1 |
secp128r2 |
secp160k1 |
secp160r1 |
secp160r2 |
secp192k1 |
secp192r1 |
secp224k1 |
secp224r1 |
secp256k1 |
secp256r1 |
secp384r1 |
secp521r1 |
sect113r1 |
sect113r2 |
sect131r1 |
sect131r2 |
sect163k1 |
sect163r1 |
sect163r2 |
sect193r1 |
sect193r2 |
sect233k1 |
sect233r1 |
sect239k1 |
sect283k1 |
sect283r1 |
sect409k1 |
sect409r1 |
sect571k1 |
sect571r1 |
wtls1 |
wtls10 |
wtls11 |
wtls12 |
wtls3 |
wtls4 |
wtls5 |
wtls6 |
wtls7 |
wtls8 |
wtls9
edwards_curve_dh() = x25519 | x448
edwards_curve_ed() = ed25519 | ed448
Note that some curves are disabled if FIPS is enabled.
ec_explicit_curve() =
{Field :: ec_field(),
Curve :: ec_curve(),
BasePoint :: binary(),
Order :: binary(),
CoFactor :: none | binary()}
ec_field() = ec_prime_field() | ec_characteristic_two_field()
ec_curve() =
{A :: binary(), B :: binary(), Seed :: none | binary()}
Parametric curve definition.
ec_prime_field() = {prime_field, Prime :: integer()}
ec_characteristic_two_field() =
{characteristic_two_field,
M :: integer(),
Basis :: ec_basis()}
ec_basis() =
{tpbasis, K :: integer() >= 0} |
{ppbasis,
K1 :: integer() >= 0,
K2 :: integer() >= 0,
K3 :: integer() >= 0} |
onbasis
Curve definition details.
key() = iodata()
des3_key() = [key()]
For keylengths, iv-sizes and blocksizes see the User's Guide.
A key for des3 is a list of three iolists
key_integer() = integer() | binary()
Always binary() when used as return value
rsa_public() = [key_integer()]
rsa_private() = [key_integer()]
rsa_params() =
{ModulusSizeInBits :: integer(),
PublicExponent :: key_integer()}
rsa_public() = [E, N]
rsa_private() = [E, N, D] | [E, N, D, P1, P2, E1, E2, C]
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 RFC 3447.
dss_public() = [key_integer()]
dss_private() = [key_integer()]
dss_public() = [P, Q, G, Y]
Where P, Q and G are the dss parameters and Y is the public key.
dss_private() = [P, Q, G, X]
Where P, Q and G are the dss parameters and X is the private key.
ecdsa_public() = key_integer()
ecdsa_private() = key_integer()
ecdsa_params() = ec_named_curve() | ec_explicit_curve()
eddsa_public() = key_integer()
eddsa_private() = key_integer()
eddsa_params() = edwards_curve_ed()
srp_public() = key_integer()
srp_private() = key_integer()
srp_public() = key_integer()
Where is A or B from SRP design
srp_private() = key_integer()
Where is a or b from SRP design
srp_gen_params() =
{user, srp_user_gen_params()} | {host, srp_host_gen_params()}
srp_comp_params() =
{user, srp_user_comp_params()} |
{host, srp_host_comp_params()}
srp_user_gen_params() = [DerivedKey::binary(), Prime::binary(), Generator::binary(), Version::atom()]
srp_host_gen_params() = [Verifier::binary(), Prime::binary(), Version::atom() ]
srp_user_comp_params() = [DerivedKey::binary(), Prime::binary(), Generator::binary(), Version::atom() | ScramblerArg::list()]
srp_host_comp_params() = [Verifier::binary(), Prime::binary(), Version::atom() | ScramblerArg::list()]
Where Verifier is v, Generator is g and Prime is N, DerivedKey is X, and Scrambler is u (optional will be generated if not provided) from SRP design Version = '3' | '6' | '6a'
pk_encrypt_decrypt_algs() = rsa
Algorithms for public key encrypt/decrypt. Only RSA is supported.
pk_encrypt_decrypt_opts() = [rsa_opt()] | rsa_compat_opts()
rsa_opt() =
{rsa_padding, rsa_padding()} |
{signature_md, atom()} |
{rsa_mgf1_md, sha} |
{rsa_oaep_label, binary()} |
{rsa_oaep_md, sha}
rsa_padding() =
rsa_pkcs1_padding |
rsa_pkcs1_oaep_padding |
rsa_sslv23_padding |
rsa_x931_padding |
rsa_no_padding
Options for public key encrypt/decrypt. Only RSA is supported.
The RSA options are experimental.
The exact set of options and there syntax may be changed without prior notice.
rsa_compat_opts() = [{rsa_pad, rsa_padding()}] | rsa_padding()
Those option forms are kept only for compatibility and should not be used in new code.
pk_sign_verify_algs() = rsa | dss | ecdsa | eddsa
Algorithms for sign and verify.
pk_sign_verify_opts() = [rsa_sign_verify_opt()]
rsa_sign_verify_opt() =
{rsa_padding, rsa_sign_verify_padding()} |
{rsa_pss_saltlen, integer()}
rsa_sign_verify_padding() =
rsa_pkcs1_padding |
rsa_pkcs1_pss_padding |
rsa_x931_padding |
rsa_no_padding
Options for sign and verify.
The RSA options are experimental.
The exact set of options and there syntax may be changed without prior notice.
dh_public() = key_integer()
dh_private() = key_integer()
dh_params() = [key_integer()]
dh_params() = [P, G] | [P, G, PrivateKeyBitLength]
ecdh_public() = key_integer()
ecdh_private() = key_integer()
ecdh_params() =
ec_named_curve() | edwards_curve_dh() | ec_explicit_curve()
engine_key_ref() =
#{engine := engine_ref(),
key_id := key_id(),
password => password(),
term() => term()}
engine_ref() = term()
The result of a call to engine_load/3.
key_id() = string() | binary()
Identifies the key to be used. The format depends on the loaded engine. It is passed to the ENGINE_load_(private|public)_key functions in libcrypto.
password() = string() | binary()
The password of the key stored in an engine.
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 |
engine_method_ec
engine_cmnd() = {unicode:chardata(), unicode:chardata()}
Pre and Post commands for engine_load/3 and /4.
stream_state()
hmac_state()
hash_state()
Contexts with an internal state that should not be manipulated but passed between function calls.
block_encrypt(Type :: block_cipher_without_iv(),
Key :: key(),
PlainText :: iodata()) ->
binary()
Encrypt PlainText according to Type block cipher.
May raise exception error:notsup in case the chosen Type is not supported by the underlying libcrypto implementation.
For keylengths and blocksizes see the User's Guide.
block_decrypt(Type :: block_cipher_without_iv(),
Key :: key(),
Data :: iodata()) ->
binary()
Decrypt CipherText according to Type block cipher.
May raise exception error:notsup in case the chosen Type is not supported by the underlying libcrypto implementation.
For keylengths and blocksizes see the User's Guide.
block_encrypt(Type, Key, Ivec, PlainText) -> CipherText
block_encrypt(AeadType, Key, Ivec, {AAD, PlainText}) -> {CipherText,
CipherTag}
block_encrypt(aes_gcm | aes_ccm, Key, Ivec, {AAD, PlainText, TagLength})
-> {CipherText, CipherTag}
Types:
Encrypt PlainText according to Type block cipher. IVec is an arbitrary initializing vector.
In AEAD (Authenticated Encryption with Associated Data) mode, encrypt PlainTextaccording to Type block cipher and calculate CipherTag that also authenticates the AAD (Associated Authenticated Data).
May raise exception error:notsup in case the chosen Type is not supported by the underlying libcrypto implementation.
For keylengths, iv-sizes and blocksizes see the User's Guide.
block_decrypt(Type, Key, Ivec, CipherText) -> PlainText
block_decrypt(AeadType, Key, Ivec, {AAD, CipherText, CipherTag}) ->
PlainText | error
Types:
Decrypt CipherText according to Type block cipher. IVec is an arbitrary initializing vector.
In AEAD (Authenticated Encryption with Associated Data) mode, decrypt CipherTextaccording to Type block cipher and check the authenticity the PlainText and AAD (Associated Authenticated Data) using the CipherTag. May return error if the decryption or validation fail's
May raise exception error:notsup in case the chosen Type is not supported by the underlying libcrypto implementation.
For keylengths, iv-sizes and blocksizes see the User's Guide.
bytes_to_integer(Bin :: binary()) -> integer()
Convert binary representation, of an integer, to an Erlang integer.
compute_key(Type, OthersPublicKey, MyPrivateKey, Params) ->
SharedSecret
Types:
Computes the shared secret from the private key and the other party's public key. See also public_key:compute_key/2
exor(Bin1 :: iodata(), Bin2 :: iodata()) -> binary()
Performs bit-wise XOR (exclusive or) on the data supplied.
generate_key(Type, Params) -> {PublicKey, PrivKeyOut}
generate_key(Type, Params, PrivKeyIn) -> {PublicKey, PrivKeyOut}
Types:
Generates a public key of type Type. See also public_key:generate_key/1. May raise exception:
hash(Type, Data) -> Digest
Types:
Computes a message digest of type Type from Data.
May raise exception error:notsup in case the chosen Type is not supported by the underlying libcrypto implementation.
hash_init(Type) -> State
Types:
Initializes the context for streaming hash operations. Type determines which digest to use. The returned context should be used as argument to hash_update.
May raise exception error:notsup in case the chosen Type is not supported by the underlying libcrypto implementation.
hash_update(State, Data) -> NewState
Types:
Updates the digest represented by Context using the given Data. Context must have been generated using hash_init or a previous call to this function. Data can be any length. NewContext must be passed into the next call to hash_update or hash_final.
hash_final(State) -> Digest
Types:
Finalizes the hash operation referenced by Context returned from a previous call to hash_update. The size of Digest is determined by the type of hash function used to generate it.
hmac(Type, Key, Data) -> Mac
hmac(Type, Key, Data, MacLength) -> Mac
Types:
Computes a HMAC of type Type from Data using Key as the authentication key.
MacLength will limit the size of the resultant Mac.
hmac_init(Type, Key) -> State
Types:
Initializes the context for streaming HMAC operations. Type determines which hash function to use in the HMAC operation. Key is the authentication key. The key can be any length.
hmac_update(State, Data) -> NewState
Types:
Updates the HMAC represented by Context using the given Data. Context must have been generated using an HMAC init function (such as hmac_init). Data can be any length. NewContext must be passed into the next call to hmac_update or to one of the functions hmac_final and hmac_final_n
hmac_final(State) -> Mac
Types:
Finalizes the HMAC operation referenced by Context. The size of the resultant MAC is determined by the type of hash function used to generate it.
hmac_final_n(State, HashLen) -> Mac
Types:
Finalizes the HMAC operation referenced by Context. HashLen must be greater than zero. Mac will be a binary with at most HashLen 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 HashLen bytes.
cmac(Type, Key, Data) -> Mac
cmac(Type, Key, Data, MacLength) -> Mac
Types:
Computes a CMAC of type Type from Data using Key as the authentication key.
MacLength will limit the size of the resultant Mac.
info_fips() -> not_supported | not_enabled | enabled
Provides information about the FIPS operating status of crypto and the underlying libcrypto library. If crypto was built with FIPS support this can be either enabled (when running in FIPS mode) or not_enabled. For other builds this value is always not_supported.
See enable_fips_mode/1 about how to enable FIPS mode.
enable_fips_mode(Enable) -> Result
Types:
Enables (Enable = true) or disables (Enable = false) FIPS mode. Returns true if the operation was successful or false otherwise.
Note that to enable FIPS mode succesfully, OTP must be built with the configure option --enable-fips, and the underlying libcrypto must also support FIPS.
See also info_fips/0.
info_lib() -> [{Name, VerNum, VerStr}]
Types:
Provides the name and version of the libraries used by crypto.
Name is the name of the library. VerNum is the numeric version according to the library's own versioning scheme. VerStr contains a text variant of the version.
> info_lib().
[{<<"OpenSSL">>,269484095,<<"OpenSSL 1.1.0c 10 Nov 2016"">>}]
mod_pow(N, P, M) -> Result
Types:
Computes the function N^P mod M.
next_iv(Type :: cbc_cipher(), Data) -> NextIVec
next_iv(Type :: des_cfb, Data, IVec) -> NextIVec
Types:
Returns the initialization vector to be used in the next iteration of encrypt/decrypt of type Type. Data is the encrypted data from the previous iteration step. The IVec argument is only needed for des_cfb as the vector used in the previous iteration step.
poly1305(Key :: iodata(), Data :: iodata()) -> Mac
Types:
Computes a POLY1305 message authentication code (Mac) from Data using Key as the authentication key.
private_decrypt(Algorithm, CipherText, PrivateKey, Options) ->
PlainText
Types:
Decrypts the CipherText, encrypted with public_encrypt/4 (or equivalent function) using the PrivateKey, and returns the plaintext (message digest). This is a low level signature verification operation used for instance by older versions of the SSL protocol. See also public_key:decrypt_private/[2,3]
private_encrypt(Algorithm, PlainText, PrivateKey, Options) ->
CipherText
Types:
Encrypts the PlainText using the PrivateKey and returns the ciphertext. This is a low level signature operation used for instance by older versions of the SSL protocol. See also public_key:encrypt_private/[2,3]
public_decrypt(Algorithm, CipherText, PublicKey, Options) ->
PlainText
Types:
Decrypts the CipherText, encrypted with private_encrypt/4(or equivalent function) using the PrivateKey, and returns the plaintext (message digest). This is a low level signature verification operation used for instance by older versions of the SSL protocol. See also public_key:decrypt_public/[2,3]
public_encrypt(Algorithm, PlainText, PublicKey, Options) ->
CipherText
Types:
Encrypts the PlainText (message digest) using the PublicKey and returns the CipherText. This is a low level signature operation used for instance by older versions of the SSL protocol. See also public_key:encrypt_public/[2,3]
rand_seed(Seed :: binary()) -> ok
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 strong_rand_bytes/1 raises error:low_entropy
rand_uniform(Lo, Hi) -> N
Types:
Generate a random number N, Lo =< N < Hi. Uses the crypto library pseudo-random number generator. Hi must be larger than Lo.
start() -> ok | {error, Reason :: term()}
Equivalent to application:start(crypto).
stop() -> ok | {error, Reason :: term()}
Equivalent to application:stop(crypto).
strong_rand_bytes(N :: integer() >= 0) -> binary()
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 RAND_bytes method from OpenSSL.
May raise exception error:low_entropy in case the random generator failed due to lack of secure "randomness".
rand_seed() -> rand:state()
Creates state object for random number generation, in order to generate cryptographically strong random numbers (based on OpenSSL's BN_rand_range), and saves it in the process dictionary before returning it as well. See also rand:seed/1 and rand_seed_s/0.
When using the state object from this function the rand functions using it may raise exception error:low_entropy in case the random generator failed due to lack of secure "randomness".
Example
_ = crypto:rand_seed(), _IntegerValue = rand:uniform(42), % [1; 42] _FloatValue = rand:uniform(). % [0.0; 1.0[
rand_seed_s() -> rand:state()
Creates state object for random number generation, in order to generate cryptographically strongly random numbers (based on OpenSSL's BN_rand_range). See also rand:seed_s/1.
When using the state object from this function the rand functions using it may raise exception error:low_entropy in case the random generator failed due to lack of secure "randomness".
The only supported usage is to generate one distinct random sequence from this start state.
rand_seed_alg(Alg) -> rand:state()
Types:
Creates state object for random number generation, in order to generate cryptographically strong random numbers. See also rand:seed/1 and rand_seed_alg_s/1.
When using the state object from this function the rand functions using it may raise exception error:low_entropy in case the random generator failed due to lack of secure "randomness".
The cache size can be changed from its default value using the crypto app's configuration parameter rand_cache_size.
Example
_ = crypto:rand_seed_alg(crypto_cache), _IntegerValue = rand:uniform(42), % [1; 42] _FloatValue = rand:uniform(). % [0.0; 1.0[
rand_seed_alg_s(Alg) -> rand:state()
Types:
Creates state object for random number generation, in order to generate cryptographically strongly random numbers. See also rand:seed_s/1.
If Alg is crypto this function behaves exactly like rand_seed_s/0.
If Alg is crypto_cache this function fetches random data with OpenSSL's RAND_bytes and caches it for speed using an internal word size of 56 bits that makes calculations fast on 64 bit machines.
When using the state object from this function the rand functions using it may raise exception error:low_entropy in case the random generator failed due to lack of secure "randomness".
The cache size can be changed from its default value using the crypto app's configuration parameter rand_cache_size.
In fact since random data is cached some numbers may get reproduced if you try, but this is unpredictable.
The only supported usage is to generate one distinct random sequence from this start state.
stream_init(Type, Key) -> State
Types:
Initializes the state for use in RC4 stream encryption stream_encrypt and stream_decrypt
For keylengths see the User's Guide.
stream_init(Type, Key, IVec) -> State
Types:
Initializes the state for use in streaming AES encryption using Counter mode (CTR). Key is the AES key and must be either 128, 192, or 256 bits long. IVec is an arbitrary initializing vector of 128 bits (16 bytes). This state is for use with stream_encrypt and stream_decrypt.
For keylengths and iv-sizes see the User's Guide.
stream_encrypt(State, PlainText) -> {NewState, CipherText}
Types:
Encrypts PlainText according to the stream cipher Type specified in stream_init/3. Text can be any number of bytes. The initial State is created using stream_init. NewState must be passed into the next call to stream_encrypt.
stream_decrypt(State, CipherText) -> {NewState, PlainText}
Types:
Decrypts CipherText according to the stream cipher Type specified in stream_init/3. PlainText can be any number of bytes. The initial State is created using stream_init. NewState must be passed into the next call to stream_decrypt.
supports() -> [Support]
Types:
Can be used to determine which crypto algorithms that are supported by the underlying libcrypto library
Note: the rsa_opts entry is in an experimental state and may change or be removed without notice. No guarantee for the accuarcy of the rsa option's value list should be assumed.
ec_curves() -> [EllipticCurve]
Types:
Can be used to determine which named elliptic curves are supported.
ec_curve(CurveName) -> ExplicitCurve
Types:
Return the defining parameters of a elliptic curve.
sign(Algorithm, DigestType, Msg, Key) -> Signature
sign(Algorithm, DigestType, Msg, Key, Options) -> Signature
Types:
Creates a digital signature.
The msg is either the binary "cleartext" data to be signed or it is the hashed value of "cleartext" i.e. the digest (plaintext).
Algorithm dss can only be used together with digest type sha.
See also public_key:sign/3.
verify(Algorithm, DigestType, Msg, Signature, Key) -> Result
verify(Algorithm, DigestType, Msg, Signature, Key, Options) ->
Result
Types:
Verifies a digital signature
The msg is either the binary "cleartext" data to be signed or it is the hashed value of "cleartext" i.e. the digest (plaintext).
Algorithm dss can only be used together with digest type sha.
See also public_key:verify/4.
privkey_to_pubkey(Type, EnginePrivateKeyRef) -> PublicKey
Types:
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.
engine_get_all_methods() -> Result
Types:
Returns a list of all possible engine methods.
May raise exception error:notsup in case there is no engine support in the underlying OpenSSL implementation.
See also the chapter Engine Load in the User's Guide.
engine_load(EngineId, PreCmds, PostCmds) -> Result
Types:
Loads the OpenSSL engine given by EngineId if it is available and then returns ok and an engine handle. This function is the same as calling engine_load/4 with EngineMethods set to a list of all the possible methods. An error tuple is returned if the engine can't be loaded.
The function raises a error:badarg if the parameters are in wrong format. It may also raise the exception error:notsup in case there is no engine support in the underlying OpenSSL implementation.
See also the chapter Engine Load in the User's Guide.
engine_load(EngineId, PreCmds, PostCmds, EngineMethods) -> Result
Types:
Loads the OpenSSL engine given by EngineId if it is available and then returns ok and an engine handle. An error tuple is returned if the engine can't be loaded.
The function raises a error:badarg if the parameters are in wrong format. It may also raise the exception error:notsup in case there is no engine support in the underlying OpenSSL implementation.
See also the chapter Engine Load in the User's Guide.
engine_unload(Engine) -> Result
Types:
Unloads the OpenSSL engine given by Engine. An error tuple is returned if the engine can't be unloaded.
The function raises a error:badarg if the parameter is in wrong format. It may also raise the exception error:notsup in case there is no engine support in the underlying OpenSSL implementation.
See also the chapter Engine Load in the User's Guide.
engine_by_id(EngineId) -> Result
Types:
Get a reference to an already loaded engine with EngineId. An error tuple is returned if the engine can't be unloaded.
The function raises a error:badarg if the parameter is in wrong format. It may also raise the exception error:notsup in case there is no engine support in the underlying OpenSSL implementation.
See also the chapter Engine Load in the User's Guide.
engine_ctrl_cmd_string(Engine, CmdName, CmdArg) -> Result
Types:
Sends ctrl commands to the OpenSSL engine given by Engine. This function is the same as calling engine_ctrl_cmd_string/4 with Optional set to false.
The function raises a error:badarg if the parameters are in wrong format. It may also raise the exception error:notsup in case there is no engine support in the underlying OpenSSL implementation.
engine_ctrl_cmd_string(Engine, CmdName, CmdArg, Optional) ->
Result
Types:
Sends ctrl commands to the OpenSSL engine given by Engine. Optional is a boolean argument that can relax the semantics of the function. If set to true 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 false.
The function raises a error:badarg if the parameters are in wrong format. It may also raise the exception error:notsup in case there is no engine support in the underlying OpenSSL implementation.
engine_add(Engine) -> Result
Types:
Add the engine to OpenSSL's internal list.
The function raises a error:badarg if the parameters are in wrong format. It may also raise the exception error:notsup in case there is no engine support in the underlying OpenSSL implementation.
engine_remove(Engine) -> Result
Types:
Remove the engine from OpenSSL's internal list.
The function raises a error:badarg if the parameters are in wrong format. It may also raise the exception error:notsup in case there is no engine support in the underlying OpenSSL implementation.
engine_get_id(Engine) -> EngineId
Types:
Return the ID for the engine, or an empty binary if there is no id set.
The function raises a error:badarg if the parameters are in wrong format. It may also raise the exception error:notsup in case there is no engine support in the underlying OpenSSL implementation.
engine_get_name(Engine) -> EngineName
Types:
Return the name (eg a description) for the engine, or an empty binary if there is no name set.
The function raises a error:badarg if the parameters are in wrong format. It may also raise the exception error:notsup in case there is no engine support in the underlying OpenSSL implementation.
engine_list() -> Result
Types:
List the id's of all engines in OpenSSL's internal list.
It may also raise the exception error:notsup in case there is no engine support in the underlying OpenSSL implementation.
See also the chapter Engine Load in the User's Guide.
May raise exception error:notsup in case engine functionality is not supported by the underlying OpenSSL implementation.
ensure_engine_loaded(EngineId, LibPath) -> Result
Types:
Loads the OpenSSL engine given by EngineId and the path to the dynamic library implementing the engine. This function is the same as calling ensure_engine_loaded/3 with EngineMethods set to a list of all the possible methods. An error tuple is returned if the engine can't be loaded.
The function raises a error:badarg if the parameters are in wrong format. It may also raise the exception error:notsup in case there is no engine support in the underlying OpenSSL implementation.
See also the chapter Engine Load in the User's Guide.
ensure_engine_loaded(EngineId, LibPath, EngineMethods) -> Result
Types:
Loads the OpenSSL engine given by EngineId and the path to the dynamic library implementing the engine. This function differs from the normal engine_load in that sense it also add the engine id to the internal list in OpenSSL. Then in the following calls to the function it just fetch the reference to the engine instead of loading it again. An error tuple is returned if the engine can't be loaded.
The function raises a error:badarg if the parameters are in wrong format. It may also raise the exception error:notsup in case there is no engine support in the underlying OpenSSL implementation.
See also the chapter Engine Load in the User's Guide.
ensure_engine_unloaded(Engine) -> Result
Types:
Unloads an engine loaded with the ensure_engine_loaded function. It both removes the label from the OpenSSL internal engine list and unloads the engine. This function is the same as calling ensure_engine_unloaded/2 with EngineMethods set to a list of all the possible methods. An error tuple is returned if the engine can't be unloaded.
The function raises a error:badarg if the parameters are in wrong format. It may also raise the exception error:notsup in case there is no engine support in the underlying OpenSSL implementation.
See also the chapter Engine Load in the User's Guide.
ensure_engine_unloaded(Engine, EngineMethods) -> Result
Types:
Unloads an engine loaded with the ensure_engine_loaded function. It both removes the label from the OpenSSL internal engine list and unloads the engine. An error tuple is returned if the engine can't be unloaded.
The function raises a error:badarg if the parameters are in wrong format. It may also raise the exception error:notsup in case there is no engine support in the underlying OpenSSL implementation.
See also the chapter Engine Load in the User's Guide.
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