cryptog

README

cryptog

A cryptographic wrapper library for the Go programming language

Synopsis

Implements the RC4 and AES wrapper libraries.

RC4 Wrappers

Each of the RC4 wrappers contain an Initialization Vector (IV) and a constant value that will be checked to maintain data integrity.

RC4_PrepareKey()

This method takes any length key and takes a SHA256 sum of it, making it suitable for the RC4 encrypt/decrypt functions.

func RC4_PrepareKey(key []byte) *[]byte // Return an array containing the SHA256 of the input key

RC4_Encrypt()

This method uses the following structure:

[IV][Constant][Data]

The IV is randomized each time, but if the key is the same, then the Constant should be the same, otherwise the RC4_Decrypt() method will fail.

Please note that if the input_key parameter is nil, then the method will generate its own by calling generateHostnameKey(), which will be a key based on the hostname of the system.

const RC4_IV_LEN uint = 16
var RC4_CONSTANT_VALUE = [4]byte{ 0x40, 0xad, 0x4f, 0x22 }

func RC4_Encrypt(data []byte, input_key *[]byte) ([]byte, error)

RC4_Decrypt()

The decrypt method removes the IV and Constant values, but checks that the Constant matches RC4_CONSTANT_VALUE, otherwise an error will be thrown.

func RC4_Decrypt(data []byte, input_key *[]byte) ([]byte, error)

generateHostnameKey()

This method is used to generate a key based on the hostname of the system. An MD5 sum of the host is taken and returned as a []byte vector.

func generateHostnameKey() []byte

AES Wrappers

//TODO

Documentation

Overview

* Copyright (c) 2017 AlexRuzin (stan.ruzin@gmail.com) * * Permission is hereby granted, free of charge, to any person obtaining a copy * of this software and associated documentation files (the "Software"), to deal * in the Software without restriction, including without limitation the rights * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell * copies of the Software, and to permit persons to whom the Software is * furnished to do so, subject to the following conditions: * * The above copyright notice and this permission notice shall be included in all * copies or substantial portions of the Software. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE * SOFTWARE.

Index

• Constants
• Variables
• func AES128CBC_Decrypt(data []byte, input_key *[]byte) ([]byte, int)
• func AES128CBC_Encrypt(data []byte, input_key *[]byte) ([]byte, int)
• func GenerateRSAKeyPair(bitsize int) (public []byte, private *rsa.PrivateKey, err error)
• func RC4_Decrypt(data []byte, input_key *[]byte) ([]byte, error)
• func RC4_Encrypt(data []byte, input_key *[]byte) ([]byte, error)
• func RC4_PrepareKey(key []byte) *[]byte

Constants

const AES_KEY_SEED string = "b1ec0efec8bf032e586ffd4071b79757"

const RC4_IV_LEN uint = 16

The default initialization vector length for a new RC4 stream

const STATUS_FAIL int = -1

const STATUS_OK int = 0

Variables

var RC4_CONSTANT_VALUE = [4]byte{0x40, 0xad, 0x4f, 0x22}

Functions

func AES128CBC_Decrypt

func AES128CBC_Decrypt(data []byte, input_key *[]byte) ([]byte, int)

FIXME -- The AES functions are not complete

func AES128CBC_Encrypt

func AES128CBC_Encrypt(data []byte, input_key *[]byte) ([]byte, int)

FIXME -- The AES functions are not complete

func GenerateRSAKeyPair

func GenerateRSAKeyPair(bitsize int) (public []byte, private *rsa.PrivateKey, err error)

func RC4_Decrypt

func RC4_Decrypt(data []byte, input_key *[]byte) ([]byte, error)

func RC4_Encrypt

func RC4_Encrypt(data []byte, input_key *[]byte) ([]byte, error)

func RC4_PrepareKey

func RC4_PrepareKey(key []byte) *[]byte