Class: RubeePass::Cipher

Inherits:
Object
  • Object
show all
Defined in:
lib/rubeepass/cipher.rb

Defined Under Namespace

Modules: ID

Instance Method Summary collapse

Constructor Details

#initialize(id, iv, key) ⇒ Cipher

Returns a new instance of Cipher.



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# File 'lib/rubeepass/cipher.rb', line 52

def initialize(id, iv, key)
    @id = id
    @iv = iv
    @key = key
end

Instance Method Details

#decrypt(enc) ⇒ Object 



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# File 'lib/rubeepass/cipher.rb', line 12

def decrypt(enc)
    # Setup
    case @id
    when ID::AES
        cipher = OpenSSL::Cipher::AES.new(256, :CBC)
    when ID::CHACHA20
        cipher = OpenSSL::Cipher.new("chacha20")
    when ID::TWOFISH
        cipher = Twofish.new(
            @key,
            {
                :iv => @iv,
                :mode => :cbc,
                :padding => :none
            }
        )
    else
        raise RubeePass::Error::NotSupported.new
    end

    # Decrypt
    case @id
    when ID::AES, ID::CHACHA20
        begin
            cipher.decrypt
            cipher.key = @key
            cipher.iv = @iv
            return StringIO.new(cipher.update(enc) + cipher.final)
        rescue OpenSSL::Cipher::CipherError
            raise RubeePass::Error::InvalidPassword.new
        end
    when ID::TWOFISH
        begin
            return StringIO.new(cipher.decrypt(enc))
        rescue ArgumentError
            raise RubeePass::Error::InvalidPassword.new
        end
    end
end