Method: ECIES::Crypt#initialize

Defined in:
lib/ecies/crypt.rb

#initialize(cipher: 'AES-256-CTR', digest: 'SHA256', mac_length: :half, kdf_digest: nil, mac_digest: nil, kdf_shared_info: '', mac_shared_info: '') ⇒ Crypt

Creates a new instance of ECIES::Crypt.

Parameters:

  • cipher (String) (defaults to: 'AES-256-CTR') —

    The cipher algorithm to use. Must be one of CIPHERS.

  • digest (String, OpenSSL::Digest) (defaults to: 'SHA256') —

    The digest algorithm to use for HMAC and KDF. Must be one of DIGESTS.

  • mac_length (:half, :full) (defaults to: :half) —

    The length of the mac. If :half, the mac length will be equal to half the mac_digest's digest_legnth. If :full, the mac length will be equal to the mac_digest's digest_length.

  • kdf_digest (String, OpenSSL::Digest, nil) (defaults to: nil) —

    The digest algorithm to use for KDF. If not specified, the digest argument will be used.

  • mac_digest (String, OpenSSL::Digest, nil) (defaults to: nil) —

    The digest algorithm to use for HMAC. If not specified, the digest argument will be used.

  • kdf_shared_info (String) (defaults to: '') —

    Optional. A string containing the shared info used for KDF, also known as SharedInfo1.

  • mac_shared_info (String) (defaults to: '') —

    Optional. A string containing the shared info used for MAC, also known as SharedInfo2.


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# File 'lib/ecies/crypt.rb', line 38

def initialize(cipher: 'AES-256-CTR', digest: 'SHA256', mac_length: :half, kdf_digest: nil, mac_digest: nil, kdf_shared_info: '', mac_shared_info: '')
  @cipher = OpenSSL::Cipher.new(cipher)
  @mac_digest = OpenSSL::Digest.new(mac_digest || digest)
  @kdf_digest = OpenSSL::Digest.new(kdf_digest || digest)
  @kdf_shared_info = kdf_shared_info
  @mac_shared_info = mac_shared_info

  CIPHERS.include?(@cipher.name) or raise "Cipher must be one of #{CIPHERS}"
  DIGESTS.include?(@mac_digest.name) or raise "Digest must be one of #{DIGESTS}"
  DIGESTS.include?(@kdf_digest.name) or raise "Digest must be one of #{DIGESTS}"
  [:half, :full].include?(mac_length) or raise "mac_length must be :half or :full"

  @mac_length = @mac_digest.digest_length
  @mac_length /= 2 if mac_length == :half
end