Module: CcipherFactory::CompositeCipher::DecryptVerifier

Includes:
CcipherFactory::Common, TR::CondUtils, TeLogger::TeLogHelper
Defined in:
lib/ccipher_factory/composite_cipher/decrypt_verifier.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Methods included from CcipherFactory::Common

#attach_mode, #cleanup_intOutputBuf, #cleanup_intOutputFile, #detach_mode, #disposeOutput, #intOutputBuf, #intOutputFile, #is_attach_mode?, #is_output_given?, #output, #output_obj, #sanitize_symbol, #write_to_output

Instance Attribute Details

#decryption_key ⇒ Object

Returns the value of attribute decryption_key.



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# File 'lib/ccipher_factory/composite_cipher/decrypt_verifier.rb', line 15

def decryption_key
  @decryption_key
end

#verification_key ⇒ Object

Returns the value of attribute verification_key.



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# File 'lib/ccipher_factory/composite_cipher/decrypt_verifier.rb', line 15

def verification_key
  @verification_key
end

Instance Method Details

#decrypt_verify_final ⇒ Object 



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# File 'lib/ccipher_factory/composite_cipher/decrypt_verifier.rb', line 96

def decrypt_verify_final

  @cipher.decrypt_final

  intOutputFile.rewind
  while not intOutputFile.eof?
    @verifier.att_verify_update(intOutputFile.read)
  end

  @verifier.att_verify_final

end

#decrypt_verify_init(opts = { }, &block) ⇒ Object

Raises:



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# File 'lib/ccipher_factory/composite_cipher/decrypt_verifier.rb', line 16

def decrypt_verify_init(opts = {  }, &block)

  #@dKey = opts[:decryption_key]
  #@vKey = opts[:verification_key] # optional as asymkey the key is included

  raise CompositeCipherError, "Decryption key is required" if is_empty?(@decryption_key)
  raise CompositeCipherError, "Output is required" if not is_output_given?

  if block
    instance_eval(&block)
    decrypt_verify_final
  else
    self
  end

end

#decrypt_verify_update_cipher(cipher) ⇒ Object

Raises:



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# File 'lib/ccipher_factory/composite_cipher/decrypt_verifier.rb', line 90

def decrypt_verify_update_cipher(cipher)
  raise CompositeCipherError, "Please call update_meta() before calling update_cipher()" if is_empty?(@cipher) 

  @cipher.decrypt_update_cipher(cipher)
end

#decrypt_verify_update_meta(meta) ⇒ Object 



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# File 'lib/ccipher_factory/composite_cipher/decrypt_verifier.rb', line 33

def decrypt_verify_update_meta(meta)

  intOutputBuf.write(meta)

  begin

    Encoding.extract_meta(intOutputBuf) do |meta, bal|

      ts = BinStruct.instance.struct_from_bin(meta)
      ccBin = ts.cipher_config
      cc = BinStruct.instance.struct_from_bin(ccBin)
      scBin = ts.signer_config
      sc = BinStruct.instance.struct_from_bin(scBin)

      case BTag.value_constant(cc.oid)
      when :symkey_cipher
        @cipher = CcipherFactory::SymKeyCipher.decryptor
        @cipher.output(intOutputFile)
        @cipher.key = @decryption_key
        @cipher.decrypt_init
        @cipher.decrypt_update_meta(ccBin)
      when :ecc_cipher
        @cipher = CcipherFactory::AsymKeyCipher.decryptor
        @cipher.output(intOutputFile)
        @cipher.decryption_key = @decryption_key
        @cipher.decrypt_init
        @cipher.decrypt_update_meta(ccBin)
      else
        raise CompositeCipherError, "Unknown envelope type '#{cc.id}'"
      end

      case BTag.value_constant(sc.oid)
      when :ecc_att_sign
        @verifier = AsymKeySigner.att_verifier
        @verifier.output(@output)
      when :symkey_att_sign
        @verifier = SymKeySigner.att_verifier
        @verifier.output(@output)
        @verifier.verification_key = @verification_key
        @verifier.att_verify_init
      else
        raise CompositeCipherError, "Unknown signer type '#{sc.id}'"
      end

      decrypt_verify_update_cipher(bal) if bal.length > 0

      disposeOutput(intOutputBuf)

    end

  rescue Encoding::InsufficientData
  end



end

#embedded_signer ⇒ Object 



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# File 'lib/ccipher_factory/composite_cipher/decrypt_verifier.rb', line 109

def embedded_signer
  @verifier.embedded_signer if not_empty?(@verifier) and @verifier.respond_to?(:embedded_signer)
end