Module: CcipherFactory::Digest

Includes:
Common, TR::CondUtils
Defined in:
lib/ccipher_factory/digest/digest.rb,
lib/ccipher_factory/digest/supported_digest.rb

Defined Under Namespace

Classes: DigestEngine, DigestError, SupportedDigest

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Methods included from 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

#algo ⇒ Object

Mixin methods



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# File 'lib/ccipher_factory/digest/digest.rb', line 73

def algo
  @algo
end

#digestVal ⇒ Object

Mixin methods



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# File 'lib/ccipher_factory/digest/digest.rb', line 73

def digestVal
  @digestVal
end

#salt ⇒ Object

Mixin methods



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# File 'lib/ccipher_factory/digest/digest.rb', line 73

def salt
  @salt
end

Class Method Details

.from_encoded(bin, &block) ⇒ Object 



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# File 'lib/ccipher_factory/digest/digest.rb', line 20

def self.from_encoded(bin, &block)
  ts = BinStruct.instance.struct_from_bin(bin)
  from_tspec(ts, &block)
end

.from_tspec(ts, &block) ⇒ Object 



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# File 'lib/ccipher_factory/digest/digest.rb', line 25

def self.from_tspec(ts, &block)

  if ts.oid == BTag.constant_value(:digest_attached)
    dig = from_encoded(ts.digest_config)
    dig.digestVal = ts.digest_value
    dig
  else

    algo = BTag.value_constant(ts.digest_algo)
    logger.debug "from_encoded algo : #{algo}"
    dig = instance
    dig.salt = ts.salt
    dig.digest_init(algo, dig.salt, &block)
  end
end

.instance ⇒ Object

(eng = SupportedDigest.instance.default_digest, *args)



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# File 'lib/ccipher_factory/digest/digest.rb', line 13

def self.instance #(eng = SupportedDigest.instance.default_digest, *args)
  #raise DigestEror, "Digest '#{eng}' is not supported" if not SupportedDigest.instance.is_supported?(eng)
  dig = DigestEngine.new
  dig.extend(Digest)
  dig
end

.logger ⇒ Object 



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# File 'lib/ccipher_factory/digest/digest.rb', line 62

def self.logger
  if @logger.nil?
    @logger = Tlogger.new
    @logger.tag = :ccfact_digest
  end
  @logger
end

.parse(bin, &block) ⇒ Object 



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# File 'lib/ccipher_factory/digest/digest.rb', line 41

def self.parse(bin, &block)
 
  res = {  }
  ts = BinStruct.instance.struct_from_bin(bin)
  res[:type] = BTag.value_constant(ts.oid)

  if res[:type] == :digest_attached
    #conf = Encoding::ASN1Decoder.from_encoded(ts.value(:digest_config))
    conf = BinStruct.instance.struct_from_bin(ts.digest_config)
    res[:algo] = BTag.value_constant(conf.digest_algo)
    res[:salt] = conf.salt
    #res[:algo] = Tag.constant_key(conf.value(:digest_algo)) 
    #res[:salt] = conf.value(:salt)
  end

  res[:digest] = ts.digest_value

  res

end

.to_digest_string(sym) ⇒ Object 



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# File 'lib/ccipher_factory/digest/digest.rb', line 154

def self.to_digest_string(sym)
  if not_empty?(sym)
    sym.to_s.gsub("_","-")
  else
    sym
  end
end

Instance Method Details

#digest_final ⇒ Object

Raises:



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# File 'lib/ccipher_factory/digest/digest.rb', line 122

def digest_final

  raise DigestError, "Please call digest_init first before call final() (#{@digest.inspect})" if @digest.nil?

  @digestVal = @digest.digest_final
  @digest = nil

  write_to_output(@digestVal)

  #ts = Encoding::ASN1Encoder.instance(:digest)
  ts = BinStruct.instance.struct(:digest)
  ts.digest_algo = BTag.constant_value(@algo)
  if not_empty?(@salt)
    ts.salt = @salt
  else
    ts.salt = ""
  end

  if is_attach_mode?
    tsd = BinStruct.instance.struct(:digest_attached)
    #tsd = Encoding::ASN1Encoder.instance(:digest_attached)
    tsd.digest_config = ts.encoded
    tsd.digest_value = @digestVal
    res = tsd.encoded
  else
    res = ts.encoded
  end

  res

end

#digest_init(*args, &block) ⇒ Object

Raises:



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# File 'lib/ccipher_factory/digest/digest.rb', line 74

def digest_init(*args, &block)

  logger.debug "args : #{args}"

  @algo = args.first
  @algo = SupportedDigest.instance.default_digest if is_empty?(@algo)
  raise DigestError, "Given digest '#{@algo}' is not supported.\nPossible digest algo including: #{SupportedDigest.instance.supported.join(", ")}" if not SupportedDigest.instance.is_supported?(@algo)

  logger.debug "Digest algo in init : #{@algo}"

  @digest = Ccrypto::AlgoFactory.engine(Ccrypto::DigestConfig).digest(@algo)

  #@digest = OpenSSL::Digest.new(Digest.to_digest_string(@algo))

  salt = args[1]
  if not_empty?(salt)
    logger.debug "Salt given #{salt} / #{salt.length}"

    case salt
    when :random_salt, :random
      saltLen = args[2] || 16
      sre = Ccrypto::AlgoFactory.engine(Ccrypto::SecureRandomConfig)
      @salt = sre.random_bytes(saltLen)
      @digest.digest_update(@salt)
    else
      if salt.is_a?(String)
        @salt = salt
        @digest.digest_update(@salt)
      else
        raise DigestError, "Unknown option '#{salt}' for salt"
      end
    end
  end

  if block
    instance_eval(&block)
    digest_final
  else
    self
  end

end

#digest_update(val) ⇒ Object

Raises:



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# File 'lib/ccipher_factory/digest/digest.rb', line 117

def digest_update(val)
  raise DigestError, "Please call digest_init first before call update() (#{@digest.inspect})" if @digest.nil?
  @digest.digest_update(val) 
end