Class: Ccrypto::Java::Argon2Engine

Inherits:
Object
  • Object
show all
Includes:
DataConversion, TR::CondUtils
Defined in:
lib/ccrypto/java/engines/argon2_engine.rb

Instance Method Summary collapse

Methods included from DataConversion

#from_b64, #from_b64_mime, #from_hex, included, #to_b64, #to_b64_mime, #to_bin, #to_hex, #to_java_bytes, #to_str

Constructor Details

#initialize(conf, &block) ⇒ Argon2Engine

Returns a new instance of Argon2Engine.

Raises:

  • (KDFEngineException) 


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# File 'lib/ccrypto/java/engines/argon2_engine.rb', line 11

def initialize(conf, &block)
  
  raise KDFEngineException, "Argon2 config is expected" if not conf.is_a?(Ccrypto::Argon2Config)
  raise KDFEngineException, "Output bit length (outBitLength) value is not given or not a positive value (Given #{conf.outBitLength})" if is_empty?(conf.outBitLength) or conf.outBitLength <= 0

  #logger.warn "Memory cost is less then 1GB (recommended value)" if conf.cost < 1024*1024*1024

  @config = conf
end

Instance Method Details

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



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# File 'lib/ccrypto/java/engines/argon2_engine.rb', line 21

def derive(input, outFormat = :binary)
 
  gen = org.bouncycastle.crypto.generators.Argon2BytesGenerator.new
  builder = org.bouncycastle.crypto.params.Argon2Parameters::Builder.new

  logger.debug "outBitLength : #{@config.outBitLength} / #{@config.outBitLength/8} bytes"
  outBuf = ::Java::byte[@config.outBitLength/8].new

  logger.debug "Iteration : #{@config.iter}"
  builder.withIterations(@config.iter)

  logger.debug "Cost : #{2**@config.cost}"
  #builder.withMemoryAsKB(@config.cost)  # unit here is Kilobyte. Config standardize to byte length
  builder.withMemoryPowOfTwo(@config.cost)  

  logger.debug "Parallel : #{@config.parallel}"
  builder.withParallelism(@config.parallel)

  logger.debug "Salt : #{to_hex(@config.salt)}"
  builder.withSalt(to_java_bytes(@config.salt))

  #logger.debug "Secret : #{to_b64(to_java_bytes(@config.secret))}"
  if not (@config.secret.nil? or @config.secret.empty?)
    logger.debug "Secret given #{to_hex(@config.secret)}" 
    builder.withSecret(to_java_bytes(@config.secret)) 
  else
    logger.debug "Empty secret value" 
  end

  case @config.variant
  when :argon2d
    logger.debug "Variant : argon2d"
    builder.withVersion(0)
  when :argon2i
    logger.debug "Variant : argon2i"
    builder.withVersion(1)
  when :argon2id
    logger.debug "Variant : argon2id"
    builder.withVersion(2)
  when :argon2_version_10
    logger.debug "Variant : argon2_version_10"
    # 0x10
    builder.withVersion(16)
  when :argon2_version_13
    logger.debug "Variant : argon2_version_13"
    # 0x13
    builder.withVersion(19)
  else
    raise KDFEngineException, "Unknown variant '#{@config.variant}'"
  end

  gen.init(builder.build())

  gen.generateBytes(to_java_bytes(input), outBuf)

  case outFormat
  when :hex
    to_hex(outBuf)
  when :b64
    to_b64(outBuf)
  else
    outBuf
  end

end