Class: Melos::Crypto::CipherSuite

Inherits:
Object
  • Object
show all
Defined in:
lib/melos/crypto.rb

Defined Under Namespace

Modules: X25519, X448 Classes: EC, P256, P384, P521

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(suite_id) ⇒ CipherSuite

Returns a new instance of CipherSuite.



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# File 'lib/melos/crypto.rb', line 120

def initialize(suite_id)
  case suite_id
  when 1 # MLS_128_DHKEMX25519_AES128GCM_SHA256_Ed25519
    @level = 128
    @digest = OpenSSL::Digest.new('sha256')
    @hpke = HPKE.new(:x25519, :sha256, :sha256, :aes_128_gcm)
    @kdf = @hpke.hkdf
    @pkey = Melos::Crypto::CipherSuite::X25519
  when 2 # MLS_128_DHKEMP256_AES128GCM_SHA256_P256
    @level = 128
    @digest = OpenSSL::Digest.new('sha256')
    @hpke = HPKE.new(:p_256, :sha256, :sha256, :aes_128_gcm)
    @kdf = @hpke.hkdf
    @pkey = Melos::Crypto::CipherSuite::P256
  when 3 # MLS_128_DHKEMX25519_CHACHA20POLY1305_SHA256_Ed25519
    @level = 128
    @digest = OpenSSL::Digest.new('sha256')
    @hpke = HPKE.new(:x25519, :sha256, :sha256, :chacha20_poly1305)
    @kdf = @hpke.hkdf
    @pkey = Melos::Crypto::CipherSuite::X25519
  when 4 # MLS_256_DHKEMX448_AES256GCM_SHA512_Ed448
    @level = 256
    @digest = OpenSSL::Digest.new('sha512')
    @hpke = HPKE.new(:x448, :sha512, :sha512, :aes_256_gcm)
    @kdf = @hpke.hkdf
    @pkey = Melos::Crypto::CipherSuite::X448
  when 5 # MLS_256_DHKEMP521_AES256GCM_SHA512_P521
    @level = 256
    @digest = OpenSSL::Digest.new('sha512')
    @hpke = HPKE.new(:p_521, :sha512, :sha512, :aes_256_gcm)
    @kdf = @hpke.hkdf
    @pkey = Melos::Crypto::CipherSuite::P521
  when 6 # MLS_256_DHKEMX448_CHACHA20POLY1305_SHA512_Ed448
    @level = 256
    @digest = OpenSSL::Digest.new('sha512')
    @hpke = HPKE.new(:x448, :sha512, :sha512, :chacha20_poly1305)
    @kdf = @hpke.hkdf
    @pkey = Melos::Crypto::CipherSuite::X448
  when 7 # MLS_256_DHKEMP384_AES256GCM_SHA384_P384
    @level = 256
    @digest = OpenSSL::Digest.new('sha384')
    @hpke = HPKE.new(:p_384, :sha384, :sha384, :aes_256_gcm)
    @kdf = @hpke.hkdf
    @pkey = Melos::Crypto::CipherSuite::P384
  end
end

Instance Attribute Details

#digest ⇒ Object

Returns the value of attribute digest.



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# File 'lib/melos/crypto.rb', line 119

def digest
  @digest
end

#hpke ⇒ Object

Returns the value of attribute hpke.



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# File 'lib/melos/crypto.rb', line 119

def hpke
  @hpke
end

#kdf ⇒ Object

Returns the value of attribute kdf.



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# File 'lib/melos/crypto.rb', line 119

def kdf
  @kdf
end

#level ⇒ Object

Returns the value of attribute level.



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# File 'lib/melos/crypto.rb', line 119

def level
  @level
end

#pkey ⇒ Object

Returns the value of attribute pkey.



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# File 'lib/melos/crypto.rb', line 119

def pkey
  @pkey
end