erlang加密模塊crypto的一些使用

crypto

模塊描述
該模塊提供一系列加密函數:算法

  • 散列函數-安全散列標準,MD5報文摘要算法(RFC 1321)和MD4報文摘要算法(RFC 1320);
  • Hmac函數-散列消息認證(RFC 2104)
  • 分組密碼-DES和AES的分組密碼模式-ECB,CBC,CFB,OFB和CTR
  • RSA加密(RFC 1321)
  • 數字簽名 數字簽名標準(DSS)和橢圓曲線數字簽名算法(ECDSA)
  • 安全遠程密碼協議(RFC 2945)

數據類型安全

key_value() = integer() | binary()
digest_type() = md5 | sha | sha224 | sha256 | sha384 | sha512
hash_algorithms() = md5 | ripemd160 | sha | sha224 | sha256 | sha384 | sha512
rsa_private() = [key_value()] = [E, N, D] | [E, N, D, P1, P2, E1, E2, C]
dss_private() = [key_value()] = [P, Q, G, X]
ecdh_private() = key_value()
ecdh_params() = ec_named_curve() | ec_explicit_curve()
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
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函數

 

經常使用函數
sign/4
用法:加密

sign(Algorithm, DigestType, Msg, Key) -> binary() when
  Algorithm = rsa | dss | ecdsa, 
  DigestType = digest_type(),
  Msg = binary() | {digest, binary()},
  Key = rsa_private() | dss_private() | [ecdh_private(), ecdh_params()].

生成數字簽名,相似於public_key:sign/3。spa

 

verify/5code

verify(Algorithm, DigestType, Msg, Signature, Key) -> boolean() when
  Algorithm = rsa | dss | ecdsa,
  DigestType = digest_type(),
  Msg = binary() | {digest,binary()},
  Signature = binary(),
  Key = rsa_public() | dss_public() | [ecdh_public(),ecdh_params()].

數字簽名驗證,相似於public_key:verify/4。blog

 

hmac/3 & hmac/4ip

hmac(Type, Key, Data, MacLength) -> binary() when
  Type = 散列算法,除了ripemd160,
  Key = iodata(),
  Data = iodata(),
  MacLength = integer().

利用哈希算法,一個密鑰Key和一個消息Data爲輸入,生成一個消息摘要。md5

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