A Golang implementation of the Data Encryption Standard (DES). This module provides the following functions:

The Encrypt64 function signature is:

func Encrypt64(data [8]byte, key [8]byte) (encrypted [8]byte)

It takes a 64-bit data block and a 64-bit key and returns an encrypted version of the plaintext which is also 64-bits. All the inputs and outputs are represented as byte arrays of fixed size 8.

The Decrypt64 function signature is:

func Decrypt64(data [8]byte, key [8]byte) (decrypted [8]byte)

This is the inverse of the Encrypt64 function. It takes in a 64-bit ciphertext and a 64-bit key to generate a 64 bit plaintext version of it.

Encrypts using DES in ECB mode.

The Encrypt function signature is:

func Encrypt(data []byte, key [8]byte) (encrypted []byte)

It takes a byte array and a 64-bit key and returns an encrypted version of the plaintext. All the inputs and outputs are represented as byte arrays. The input plaintext is first padded to 64-bits using PKCS7 padding.

Decrypts using DES in ECB mode.

The Decrypt function signature is:

func Decrypt(data []byte, key [8]byte) (decrypted []byte, err error)

It takes a byte array and a 64-bit key and returns an decrypted version of the ciphertext. All the inputs and outputs are represented as byte arrays. Padding is removed from the decrypted plaintext using PKCS7 padding scheme. Error is raised if input is not a multiple of 64 bits or if padding is invalid.

Encrypts using DES in CBC mode.

Function signature is

func Encrypt_CBC(plaintext []byte, key [8]byte, iv [8]byte) (ciphertext []byte)

Decrypts using DES in CBC mode.

Function signature is

func Decrypt_CBC(ciphertext []byte, key [8]byte, iv [8]byte) (plaintext []byte, err error)

Encrypts using DES in CFB mode with 8-bit transmission.

Function signature is

func Encrypt_CFB8(plaintext []byte, key [8]byte, iv [8]byte) (ciphertext []byte, err error)

Decrypts using DES in CFB mode with 8-bit transmission.

Function signature is

func Decrypt_CFB8(ciphertext []byte, key [8]byte, iv [8]byte) (plaintext []byte, err error)

Encrypts using DES in OFB mode.

Function signature is

func Encrypt_OFB(plaintext []byte, key [8]byte, nonce [8]byte) (ciphertext []byte, err error)

Decrypts using DES in CFB mode.

Function signature is

func Decrypt_OFB(ciphertext []byte, key [8]byte, nonce [8]byte) (plaintext []byte, err error)

All the methods defined above are also available in their 3DES versions. Prefixing any of the methods above with TripleDES128_ will give you it's 2 Key 3DES version. All such methods take 128-bit (16-byte) keys. Similiarly, prefixing with TripleDES192_ will give you it's 3 Key 3DES version. These methods take 192-bit (24-byte) keys. Besides key-length all functions have the same signature as their normal DES counterparts.