crypto

DATA TYPES key_value() = integer() | binary()

Always binary() when used as return value

rsa_public() = [key_value()] = [E, N]

Where E is the public exponent and N is public modulus.

rsa_private() = [key_value()] = [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_value()] = [P, Q, G, Y]

Where P, Q and G are the dss parameters and Y is the public key.

dss_private() = [key_value()] = [P, Q, G, X]

Where P, Q and G are the dss parameters and X is the private key.

srp_public() = key_value()

Where is A or B from SRP design

srp_private() = key_value()

Where is a or b from SRP design

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'

dh_public() = key_value() dh_private() = key_value() dh_params() = [key_value()] = [P, G] | [P, G, PrivateKeyBitLength] ecdh_public() = key_value() ecdh_private() = key_value() ecdh_params() = ec_named_curve() | ec_explicit_curve()

ec_explicit_curve() =
    {ec_field(), Prime :: key_value(), Point :: key_value(), Order :: integer(),
     CoFactor :: none | integer()}

ec_field() = {prime_field, Prime :: integer()} |
    {characteristic_two_field, M :: integer(), Basis :: ec_basis()}

ec_basis() = {tpbasis, K :: non_neg_integer()} |
    {ppbasis, K1 :: non_neg_integer(), K2 :: non_neg_integer(), K3 :: non_neg_integer()} |
    onbasis

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

engine_key_ref() = #{engine   := engine_ref(),
                               key_id   := key_id(),
                               password => password()}

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 key's password

stream_cipher() = rc4 | aes_ctr

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

Key length is 128, 192 or 256 bits

rc4_key() = iodata()

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

des_key() = iodata()

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 rsa_digest_type() = md5 | ripemd160 | sha | sha224 | sha256 | sha384 | sha512 dss_digest_type() = sha | sha224 | sha256 | sha384 | sha512

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.

ecdsa_digest_type() = sha | sha224 | sha256 | sha384 | sha512 sign_options() = [{rsa_pad, rsa_sign_padding()} | {rsa_pss_saltlen, integer()}] rsa_sign_padding() = rsa_pkcs1_padding | rsa_pkcs1_pss_padding 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() = 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

Note that ec_gf2m is not strictly a public key algorithm, but a restriction on what curves are supported with ecdsa and ecdh.

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