Class: Ccrypto::Ruby::CipherEngine

Inherits:
Object
  • Object
show all
Includes:
DataConversion, TR::CondUtils, TeLogger::TeLogHelper
Defined in:
lib/ccrypto/ruby/engines/cipher_engine.rb

Class Method Summary collapse

Instance Method Summary collapse

Methods included from DataConversion

#from_b64, #from_hex, included, #to_b64, #to_hex, #to_int_array

Constructor Details

#initialize(*args, &block) ⇒ CipherEngine

Returns a new instance of CipherEngine.



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# File 'lib/ccrypto/ruby/engines/cipher_engine.rb', line 61

def initialize(*args, &block)
  @spec = args.first

  #teLogger = TteLogger.new
  teLogger.debug "Cipher spec : #{@spec}"

  begin
    case @spec
    #when String
    #  @cipher = OpenSSL::Cipher.new(@spec)
    when Ccrypto::CipherEngineConfig
      @cipher = OpenSSL::Cipher.new(@spec.provider_config)
    when Ccrypto::DirectCipherConfig
      @cipher = OpenSSL::Cipher.new(self.class.to_openssl_spec(@spec))
    else
      raise Ccrypto::CipherEngineException, "Not supported cipher init type #{@spec.class}"
    end
  rescue OpenSSL::Cipher::CipherError, RuntimeError => ex
    raise Ccrypto::CipherEngineException, ex
  end

  case @spec.cipherOps
  when :encrypt, :enc
    teLogger.debug "Operation encrypt"
    @cipher.encrypt
  when :decrypt, :dec
    teLogger.debug "Operation decrypt"
    @cipher.decrypt
  else
    raise Ccrypto::CipherEngineException, "Cipher operation (encrypt/decrypt) must be given"
  end


  if @spec.has_iv?
    teLogger.debug "IV from spec"
    @cipher.iv = @spec.iv
    teLogger.debug "IV : #{to_hex(@spec.iv)}"
  else
    teLogger.debug "Generate random IV"
    @spec.iv = @cipher.random_iv
    teLogger.debug "IV : #{to_hex(@spec.iv)}"
  end


  if @spec.has_key?
    teLogger.debug "Key from spec"
    case @spec.key
    when Ccrypto::SecretKey
      @cipher.key = @spec.key.to_bin
    when String
      @cipher.key = @spec.key
    else
      raise Ccrypto::CipherEngineException, "Unknown key type for processing #{@spec.key}"
    end
  else
    teLogger.debug "Generate random Key"
    @spec.key = @cipher.random_key
  end


  if @spec.is_mode?(:gcm)

    if not_empty?(@spec.auth_data) 
      teLogger.debug "Setting auth data"
      @cipher.auth_data = @spec.auth_data
    end

    if not_empty?(@spec.auth_tag) 
      raise CipherEngineException, "Tag length of 16 bytes is expected" if @spec.auth_tag.bytesize != 16
      teLogger.debug "Setting auth tag"
      @cipher.auth_tag = @spec.auth_tag
    end

  end

end

Class Method Details

.is_supported_cipher?(c) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/ccrypto/ruby/engines/cipher_engine.rb', line 23

def self.is_supported_cipher?(c)
  case c
  when String
    supported_ciphers.include?(c)  
  when Hash
    spec = to_openssl_spec(c)
    begin
      OpenSSL::Cipher.new(spec)
      true
    rescue Exception => ex
      false
    end
  else
    raise Ccrypto::CipherEngineException, "Unsupported input #{c} to check supported cipher"
  end
end

.supported_ciphers ⇒ Object 



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# File 'lib/ccrypto/ruby/engines/cipher_engine.rb', line 14

def self.supported_ciphers
  if @sCipher.nil?
    @sCipher = OpenSSL::Cipher.ciphers
  end

  @sCipher

end

.to_openssl_spec(spec) ⇒ Object 



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# File 'lib/ccrypto/ruby/engines/cipher_engine.rb', line 40

def self.to_openssl_spec(spec)
  res = []

  teLogger.debug "to_openssl_spec #{spec}"
  case spec.algo
  when :blowfish
    res << "bf"
  else
    res << spec.algo
  end

  res << spec.keysize if not_empty?(spec.keysize) and spec.keysize.to_i > 0 and not spec.is_algo?(:chacha20) and not spec.is_algo?(:seed) and not spec.is_algo?(:sm4) and not spec.is_algo?(:blowfish)

  res << spec.mode 

  teLogger.debug "to_openssl_spec #{res}"

  res.join("-")
  
end

Instance Method Details

#final(val = nil) ⇒ Object 



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# File 'lib/ccrypto/ruby/engines/cipher_engine.rb', line 142

def final(val = nil)
  res = []

  begin

    if not_empty?(val)
      res << @cipher.update(val)
    end

    res << @cipher.final

  rescue Exception => ex
    raise CipherEngineException, ex
  end

  if @spec.is_mode?(:gcm) and @spec.is_encrypt_cipher_mode?
    @spec.auth_tag = @cipher.auth_tag 
  end

  res.join
end

#reset ⇒ Object 



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# File 'lib/ccrypto/ruby/engines/cipher_engine.rb', line 164

def reset
  @cipher.reset
end

#update(val) ⇒ Object 



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# File 'lib/ccrypto/ruby/engines/cipher_engine.rb', line 138

def update(val)
  @cipher.update(val) 
end