GO与Java的DES ECB加解密算法互换

Java默认DES算法使用DES/ECB/PKCS5Padding工作方式,在GO语言中因为ECB的脆弱性,DES的ECB模式是故意不放出来的,但实际情况中有时我们并不需要那么安全,以下代码完成与java默认DES算法的互通,为了能更好的与各种语言互通,建议在java中还是明确指明工作模式,如:DES/CBC/PKCS5Padding

package main
import (
	"bytes"
	"crypto/des"
	"errors"
	"log"
)
func main() {
	log.SetFlags(log.LstdFlags | log.Lshortfile)
	log.Println("程序开始....")
	key := []byte{0xD5, 0x92, 0x86, 0x02, 0x2A, 0x0B, 0x3E, 0x64}
	data := []byte("hello world")
	out, _ := MyEncrypt(data, key)
	log.Println("加密后:", out)
	out, _ = MyDecrypt(out, key)
	log.Println("解密后:", string(out))
}
func MyEncrypt(data, key []byte) ([]byte, error) {
	block, err := des.NewCipher(key)
	if err != nil {
		return nil, err
	}
	bs := block.BlockSize()
	data = PKCS5Padding(data, bs)
	if len(data)%bs != 0 {
		return nil, errors.New("Need a multiple of the blocksize")
	}
	out := make([]byte, len(data))
	dst := out
	for len(data) > 0 {
		block.Encrypt(dst, data[:bs])
		data = data[bs:]
		dst = dst[bs:]
	}
	return out, nil
}
func MyDecrypt(data []byte, key []byte) ([]byte, error) {
	block, err := des.NewCipher(key)
	if err != nil {
		return nil, err
	}
	bs := block.BlockSize()
	if len(data)%bs != 0 {
		return nil, errors.New("crypto/cipher: input not full blocks")
	}
	out := make([]byte, len(data))
	dst := out
	for len(data) > 0 {
		block.Decrypt(dst, data[:bs])
		data = data[bs:]
		dst = dst[bs:]
	}
	out = PKCS5UnPadding(out)
	return out, nil
}
func PKCS5Padding(ciphertext []byte, blockSize int) []byte {
	padding := blockSize - len(ciphertext)%blockSize
	padtext := bytes.Repeat([]byte{byte(padding)}, padding)
	return append(ciphertext, padtext...)
}
func PKCS5UnPadding(origData []byte) []byte {
	length := len(origData)
	unpadding := int(origData[length-1])
	return origData[:(length - unpadding)]
}

本文来自:CSDN博客

感谢作者:scybs

查看原文:GO与Java的DES ECB加解密算法互换

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