Class: Ccrypto::Java::PBKDF2Engine

Inherits:
Object
  • Object
show all
Includes:
DataConversion, TR::CondUtils
Defined in:
lib/ccrypto/java/engines/pbkdf2_engine.rb

Instance Method Summary collapse

Methods included from DataConversion

#from_b64, #from_hex, included, #to_b64, #to_b64_mime, #to_bin, #to_hex, #to_java_bytes, #to_str

Constructor Details

#initialize(*args, &block) ⇒ PBKDF2Engine

Returns a new instance of PBKDF2Engine.

Raises:

  • (KDFEngineException) 


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# File 'lib/ccrypto/java/engines/pbkdf2_engine.rb', line 11

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

  raise KDFEngineException, "KDF config is expected. Given #{@config}" if not @config.is_a?(Ccrypto::PBKDF2Config)
  raise KDFEngineException, "Output bit length (outBitLength) value is not given or not a positive value (#{@config.outBitLength})" if is_empty?(@config.outBitLength) or @config.outBitLength <= 0

  raise KDFEngineException, "Digest algo is not supported. Given #{@config.digest}, supported: #{supported_digest.join(", ")}" if not @config.digest.nil? and not is_digest_supported?(@config.digest)

  @config.digest = default_digest if is_empty?(@config.digest)

  @config.salt = SecureRandom.random_bytes(16) if is_empty?(@config.salt)
end

Instance Method Details

#default_digest ⇒ Object 



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# File 'lib/ccrypto/java/engines/pbkdf2_engine.rb', line 62

def default_digest
  :sha256
end

#derive(input, output = :binary) ⇒ Object 



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# File 'lib/ccrypto/java/engines/pbkdf2_engine.rb', line 24

def derive(input, output = :binary)
  
  begin

    case input
    when String
      if input.ascii_only?
        pass = input.to_java.toCharArray
      else
        pass = to_hex(to_java_bytes(input)).to_java.toCharArray
      end
    when ::Java::byte[]
      pass = to_hex(to_java_bytes(input)).to_java.toCharArray
    else
      raise KDFEngineException, "Input type '#{input.class}' cannot convert to char array"
    end

    skf = javax.crypto.SecretKeyFactory.getInstance("PBKDF2WithHMAC#{@config.digest.upcase}",JCEProvider::DEFProv)
    keySpec = javax.crypto.spec.PBEKeySpec.new(pass.to_java, to_java_bytes(@config.salt), @config.iter, @config.outBitLength)

    sk = skf.generateSecret(keySpec)
    out = sk.encoded

    case output
    when :b64
      to_b64(out)
    when :hex
      to_hex(out)
    else
      out
    end

  rescue Exception => ex
    raise KDFEngineException, ex
  end
  
end