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|
brainpoolP160r1| brainpoolP160t1| brainpoolP192r1| brainpoolP192t1| brainpoolP224r1|
brainpoolP224t1| brainpoolP256r1| brainpoolP256t1| brainpoolP320r1| brainpoolP320t1|
brainpoolP384r1| brainpoolP384t1| brainpoolP512r1| brainpoolP512t1
Note that the sect curves are GF2m (characteristic two) curves and are only supported if the
underlying OpenSSL has support for them.
See also crypto:supports/0
stream_cipher() = rc4 | aes_ctr
block_cipher() = aes_cbc128 | aes_cfb8 | aes_cfb128 | aes_ige256 | blowfish_cbc |
blowfish_cfb64 | des_cbc | des_cfb | des3_cbc | des3_cbf
| des_ede3 | rc2_cbc aead_cipher() = aes_gcm | chacha20_poly1305
stream_key() = aes_key() | rc4_key()
block_key() = aes_key() | blowfish_key() | des_key()| des3_key()
Key length is 128, 192 or 256 bits
Variable key length from 8 bits up to 2048 bits (usually between 40 and 256)
blowfish_key() = iodata()
Variable key length from 32 bits up to 448 bits
Key length is 64 bits (in CBC mode only 8 bits are used)
des3_key() = [binary(), binary(), binary()]
Each key part is 64 bits (in CBC mode only 8 bits are used)
digest_type() = md5 | sha | sha224 | sha256 | sha384 | sha512
hash_algorithms() = md5 | ripemd160 | sha | sha224 | sha256 | sha384 | sha512
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.
cipher_algorithms() = des_cbc | des_cfb | des3_cbc | des3_cbf | des_ede3 |
blowfish_cbc | blowfish_cfb64 | aes_cbc128 | aes_cfb8 | aes_cfb128| aes_cbc256 | aes_ige256 | aes_gcm | chacha20_poly1305 | rc2_cbc | aes_ctr| rc4 public_key_algorithms() = rsa |dss | ecdsa | dh | ecdh | ec_gf2m
Note that ec_gf2m is not strictly a public key algorithm, but a restriction on what curves are supported
with ecdsa and ecdh.
Encrypt PlainText according to Type block cipher.
May throw exception notsup in case the chosen Type
is not supported by the underlying OpenSSL implementation.
block_decrypt(Type, Key, CipherText) -> PlainText
Types:
Type = des_ecb | blowfish_ecb | aes_ecb
Key = block_key()
PlainText = iodata()
Decrypt CipherText according to Type block cipher.
May throw exception notsup in case the chosen Type
is not supported by the underlying OpenSSL implementation.
block_encrypt(Type, Key, Ivec, PlainText) -> CipherText
block_encrypt(AeadType, Key, Ivec, {AAD, PlainText}) -> {CipherText, CipherTag}
Types:
Type = block_cipher()
AeadType = aead_cipher()
Key = block_key()
PlainText = iodata()
AAD = IVec = CipherText = CipherTag = binary()
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 throw exception notsup in case the chosen Type
is not supported by the underlying OpenSSL implementation.
block_decrypt(Type, Key, Ivec, CipherText) -> PlainText
block_decrypt(AeadType, Key, Ivec, {AAD, CipherText, CipherTag}) -> PlainText | error
Types:
Type = block_cipher()
AeadType = aead_cipher()
Key = block_key()
PlainText = iodata()
AAD = IVec = CipherText = CipherTag = binary()
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 throw exception notsup in case the chosen Type
is not supported by the underlying OpenSSL implementation.
bytes_to_integer(Bin) -> Integer
Types:
Bin = binary() - as returned by crypto functions
Integer = integer()
Convert binary representation, of an integer, to an Erlang integer.
compute_key(Type, OthersPublicKey, MyKey, Params) -> SharedSecret
Types:
Type = dh | ecdh | srp
OthersPublicKey = dh_public() | ecdh_public() | srp_public()
MyKey = dh_private() | ecdh_private() | {srp_public(),srp_private()}
Params = dh_params() | ecdh_params() | SrpUserParams | SrpHostParams
SrpUserParams = {user, [DerivedKey::binary(), Prime::binary(), Generator::binary(), Version::atom() | [Scrambler:binary()]]}
SrpHostParams = {host, [Verifier::binary(), Prime::binary(), Version::atom() | [Scrambler::binary]]}
SharedSecret = binary()
Computes the shared secret from the private key and the other party's public key.
See also public_key:compute_key/2
exor(Data1, Data2) -> Result
Types:
Data1, Data2 = iodata()
Result = 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:
Type = dh | ecdh | srp
Params = dh_params() | ecdh_params() | SrpUserParams | SrpHostParams
SrpUserParams = {user, [Generator::binary(), Prime::binary(), Version::atom()]}
SrpHostParams = {host, [Verifier::binary(), Generator::binary(), Prime::binary(), Version::atom()]}
PublicKey = dh_public() | ecdh_public() | srp_public()
PrivKeyIn = undefined | dh_private() | ecdh_private() | srp_private()
PrivKeyOut = dh_private() | ecdh_private() | srp_private()
Generates public keys of type Type.
See also public_key:generate_key/1
hash(Type, Data) -> Digest
Types:
Type = md4 | hash_algorithms()
Data = iodata()
Digest = binary()
Computes a message digest of type Type from Data.
May throw exception notsup in case the chosen Type
is not supported by the underlying OpenSSL implementation.
hash_init(Type) -> Context
Types:
Type = md4 | hash_algorithms()
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 throw exception notsup in case the chosen Type
is not supported by the underlying OpenSSL implementation.
hash_update(Context, Data) -> NewContext
Types:
Data = iodata()
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(Context) -> Digest
Types:
Digest = binary()
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:
Type = hash_algorithms() - except ripemd160
Key = iodata()
Data = iodata()
MacLength = integer()
Mac = binary()
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) -> Context
Types:
Type = hash_algorithms() - except ripemd160
Key = iodata()
Context = binary()
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(Context, Data) -> NewContext
Types:
Context = NewContext = binary()
Data = iodata()
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
Warning
Do not use a Context as argument in more than one
call to hmac_update or hmac_final. The semantics of reusing old contexts
in any way is undefined and could even crash the VM in earlier releases.
The reason for this limitation is a lack of support in the underlying
OpenSSL API.
hmac_final(Context) -> Mac
Types:
Context = Mac = binary()
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(Context, HashLen) -> Mac
Types:
Context = Mac = binary()
HashLen = non_neg_integer()
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.
info_lib() -> [{Name,VerNum,VerStr}]
Types:
Name = binary()
VerNum = integer()
VerStr = binary()
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">>,9469983,<<"OpenSSL 0.9.8a 11 Oct 2005">>}]
From OTP R16 the numeric version represents the version of the OpenSSL
header files (openssl/opensslv.h) 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.
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.
private_decrypt(Type, CipherText, PrivateKey, Padding) -> PlainText
Types:
Type = rsa
CipherText = binary()
PrivateKey = rsa_private()
Padding = rsa_pkcs1_padding | rsa_pkcs1_oaep_padding | rsa_no_padding
PlainText = binary()
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(Type, PlainText, PrivateKey, Padding) -> CipherText
Types:
Type = rsa
PlainText = binary()
The size of the PlainText must be less
than byte_size(N)-11 if rsa_pkcs1_padding is
used, and byte_size(N) if rsa_no_padding is
used, where N is public modulus of the RSA key.
PrivateKey = rsa_private()
Padding = rsa_pkcs1_padding | rsa_no_padding
CipherText = binary()
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(Type, CipherText, PublicKey, Padding) -> PlainText
Types:
Type = rsa
CipherText = binary()
PublicKey = rsa_public()
Padding = rsa_pkcs1_padding | rsa_no_padding
PlainText = binary()
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(Type, PlainText, PublicKey, Padding) -> CipherText
Types:
Type = rsa
PlainText = binary()
The size of the PlainText must be less
than byte_size(N)-11 if rsa_pkcs1_padding is
used, and byte_size(N) if rsa_no_padding is
used, where N is public modulus of the RSA key.
PublicKey = rsa_public()
Padding = rsa_pkcs1_padding | rsa_pkcs1_oaep_padding | rsa_no_padding
CipherText = binary()
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_bytes(N) -> binary()
Types:
N = integer()
Generates N bytes randomly uniform 0..255, and returns the
result in a binary. Uses the crypto library pseudo-random
number generator.
This function is not recommended for cryptographic purposes.
Please use
strong_rand_bytes/1 instead.
rand_seed(Seed) -> ok
Types:
Seed = binary()
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 returns low_entropy
rand_uniform(Lo, Hi) -> N
Types:
Lo, Hi, N = integer()
Generate a random number N, Lo =< N < Hi. Uses the
crypto library pseudo-random number generator.
Hi must be larger than Lo.
sign(Algorithm, DigestType, Msg, Key) -> binary()
Types:
Algorithm = rsa | dss | ecdsa
Msg = binary() | {digest,binary()}
The msg is either the binary "cleartext" data to be
signed or it is the hashed value of "cleartext" i.e. the
digest (plaintext).
DigestType = digest_type()
Key = rsa_private() | dss_private() | [ecdh_private(),ecdh_params()]
Creates a digital signature.
Algorithm dss can only be used together with digest type
sha.
See also public_key:sign/3.
start() -> ok
Equivalent to application:start(crypto).
stop() -> ok
Equivalent to application:stop(crypto).
strong_rand_bytes(N) -> binary()
Types:
N = integer()
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 throw exception low_entropy in case the random generator
failed due to lack of secure "randomness".
stream_init(Type, Key) -> State
Types:
Type = rc4
State = opaque()
Key = iodata()
Initializes the state for use in RC4 stream encryption
stream_encrypt and
stream_decrypt
stream_init(Type, Key, IVec) -> State
Types:
Type = aes_ctr
State = opaque()
Key = iodata()
IVec = binary()
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.
stream_encrypt(State, PlainText) -> { NewState, CipherText}
Types:
Text = iodata()
CipherText = binary()
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:
CipherText = iodata()
PlainText = binary()
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() -> AlgorithmList
Types:
AlgorithmList = [{hashs, [hash_algorithms()]},
{ciphers, [cipher_algorithms()]},
{public_keys, [public_key_algorithms()]}
Can be used to determine which crypto algorithms that are supported
by the underlying OpenSSL library
ec_curves() -> EllipticCurveList
Types:
EllipticCurveList = [ec_named_curve()]
Can be used to determine which named elliptic curves are supported.
ec_curve(NamedCurve) -> EllipticCurve
Types:
NamedCurve = ec_named_curve()
EllipticCurve = ec_explicit_curve()
Return the defining parameters of a elliptic curve.
verify(Algorithm, DigestType, Msg, Signature, Key) -> boolean()
Types:
Algorithm = rsa | dss | ecdsa
Msg = binary() | {digest,binary()}
The msg is either the binary "cleartext" data
or it is the hashed value of "cleartext" i.e. the digest (plaintext).
DigestType = digest_type()
Signature = binary()
Key = rsa_public() | dss_public() | [ecdh_public(),ecdh_params()]
Verifies a digital signature
Algorithm dss can only be used together with digest type
sha.
See also public_key:verify/4.
