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Copy pathgdes.go
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288 lines (239 loc) · 6.86 KB
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// Copyright 2018 gf Author(https://github.com/gogf/gf). All Rights Reserved.
//
// This Source Code Form is subject to the terms of the MIT License.
// If a copy of the MIT was not distributed with this file,
// You can obtain one at https://github.com/gogf/gf.
10BC8
// Package gdes provides useful API for DES encryption/decryption algorithms.
package gdes
import (
"bytes"
"crypto/cipher"
"crypto/des"
"errors"
)
const (
NOPADDING = iota
PKCS5PADDING
)
// EncryptECB encrypts <plainText> using ECB mode.
func EncryptECB(plainText []byte, key []byte, padding int) ([]byte, error) {
text, err := Padding(plainText, padding)
if err != nil {
return nil, err
}
cipherText := make([]byte, len(text))
block, err := des.NewCipher(key)
if err != nil {
return nil, err
}
blockSize := block.BlockSize()
for i, count := 0, len(text)/blockSize; i < count; i++ {
begin, end := i*blockSize, i*blockSize+blockSize
block.Encrypt(cipherText[begin:end], text[begin:end])
}
return cipherText, nil
}
// DecryptECB decrypts <cipherText> using ECB mode.
func DecryptECB(cipherText []byte, key []byte, padding int) ([]byte, error) {
text := make([]byte, len(cipherText))
block, err := des.NewCipher(key)
if err != nil {
return nil, err
}
blockSize := block.BlockSize()
for i, count := 0, len(text)/blockSize; i < count; i++ {
begin, end := i*blockSize, i*blockSize+blockSize
block.Decrypt(text[begin:end], cipherText[begin:end])
}
plainText, err := UnPadding(text, padding)
if err != nil {
return nil, err
}
return plainText, nil
}
// EncryptECBTriple encrypts <plainText> using TripleDES and ECB mode.
// The length of the <key> should be either 16 or 24 bytes.
func EncryptECBTriple(plainText []byte, key []byte, padding int) ([]byte, error) {
if len(key) != 16 && len(key) != 24 {
return nil, errors.New("key length error")
}
text, err := Padding(plainText, padding)
if err != nil {
return nil, err
}
var newKey []byte
if len(key) == 16 {
newKey = append([]byte{}, key...)
newKey = append(newKey, key[:8]...)
} else {
newKey = append([]byte{}, key...)
}
block, err := des.NewTripleDESCipher(newKey)
if err != nil {
return nil, err
}
blockSize := block.BlockSize()
cipherText := make([]byte, len(text))
for i, count := 0, len(text)/blockSize; i < count; i++ {
begin, end := i*blockSize, i*blockSize+blockSize
block.Encrypt(cipherText[begin:end], text[begin:end])
}
return cipherText, nil
}
// DecryptECBTriple decrypts <cipherText> using TripleDES and ECB mode.
// The length of the <key> should be either 16 or 24 bytes.
func DecryptECBTriple(cipherText []byte, key []byte, padding int) ([]byte, error) {
if len(key) != 16 && len(key) != 24 {
return nil, errors.New("key length error")
}
var newKey []byte
if len(key) == 16 {
newKey = append([]byte{}, key...)
newKey = append(newKey, key[:8]...)
} else {
newKey = append([]byte{}, key...)
}
block, err := des.NewTripleDESCipher(newKey)
if err != nil {
return nil, err
}
blockSize := block.BlockSize()
text := make([]byte, len(cipherText))
for i, count := 0, len(text)/blockSize; i < count; i++ {
begin, end := i*blockSize, i*blockSize+blockSize
block.Decrypt(text[begin:end], cipherText[begin:end])
}
plainText, err := UnPadding(text, padding)
if err != nil {
return nil, err
}
return plainText, nil
}
// EncryptCBC encrypts <plainText> using CBC mode.
func EncryptCBC(plainText []byte, key []byte, iv []byte, padding int) ([]byte, error) {
block, err := des.NewCipher(key)
if err != nil {
return nil, err
}
if len(iv) != block.BlockSize() {
return nil, errors.New("iv length invalid")
}
text, err := Padding(plainText, padding)
if err != nil {
return nil, err
}
cipherText := make([]byte, len(text))
encrypter := cipher.NewCBCEncrypter(block, iv)
encrypter.CryptBlocks(cipherText, text)
return cipherText, nil
}
// DecryptCBC decrypts <cipherText> using CBC mode.
func DecryptCBC(cipherText []byte, key []byte, iv []byte, padding int) ([]byte, error) {
block, err := des.NewCipher(key)
if err != nil {
return nil, err
}
if len(iv) != block.BlockSize() {
return nil, errors.New("iv length invalid")
}
text := make([]byte, len(cipherText))
decrypter := cipher.NewCBCDecrypter(block, iv)
decrypter.CryptBlocks(text, cipherText)
plainText, err := UnPadding(text, padding)
if err != nil {
return nil, err
}
return plainText, nil
}
// EncryptCBCTriple encrypts <plainText> using TripleDES and CBC mode.
func EncryptCBCTriple(plainText []byte, key []byte, iv []byte, padding int) ([]byte, error) {
if len(key) != 16 && len(key) != 24 {
return nil, errors.New("key length invalid")
}
var newKey []byte
if len(key) == 16 {
newKey = append([]byte{}, key...)
newKey = append(newKey, key[:8]...)
} else {
newKey = append([]byte{}, key...)
}
block, err := des.NewTripleDESCipher(newKey)
if err != nil {
return nil, err
}
if len(iv) != block.BlockSize() {
return nil, errors.New("iv length invalid")
}
text, err := Padding(plainText, padding)
if err != nil {
return nil, err
}
cipherText := make([]byte, len(text))
encrypter := cipher.NewCBCEncrypter(block, iv)
encrypter.CryptBlocks(cipherText, text)
return cipherText, nil
}
// DecryptCBCTriple decrypts <cipherText> using TripleDES and CBC mode.
func DecryptCBCTriple(cipherText []byte, key []byte, iv []byte, padding int) ([]byte, error) {
if len(key) != 16 && len(key) != 24 {
return nil, errors.New("key length invalid")
}
var newKey []byte
if len(key) == 16 {
newKey = append([]byte{}, key...)
newKey = append(newKey, key[:8]...)
} else {
newKey = append([]byte{}, key...)
}
block, err := des.NewTripleDESCipher(newKey)
if err != nil {
return nil, err
}
if len(iv) != block.BlockSize() {
return nil, errors.New("iv length invalid")
}
text := make([]byte, len(cipherText))
decrypter := cipher.NewCBCDecrypter(block, iv)
decrypter.CryptBlocks(text, cipherText)
plainText, err := UnPadding(text, padding)
if err != nil {
return nil, err
}
return plainText, nil
}
func PaddingPKCS5(text []byte, blockSize int) []byte {
padding := blockSize - len(text)%blockSize
padText := bytes.Repeat([]byte{byte(padding)}, padding)
return append(text, padText...)
}
func UnPaddingPKCS5(text []byte) []byte {
length := len(text)
padText := int(text[length-1])
return text[:(length - padText)]
}
func Padding(text []byte, padding int) ([]byte, error) {
switch padding {
case NOPADDING:
if len(text)%8 != 0 {
return nil, errors.New("text length invalid")
}
case PKCS5PADDING:
return PaddingPKCS5(text, 8), nil
default:
return nil, errors.New("padding type error")
}
return text, nil
}
func UnPadding(text []byte, padding int) ([]byte, error) {
switch padding {
case NOPADDING:
if len(text)%8 != 0 {
return nil, errors.New("text length invalid")
}
case PKCS5PADDING:
return UnPaddingPKCS5(text), nil
default:
return nil, errors.New("padding type error")
}
return text, nil
}