GO与Java的DES ECB加解密算法互换

来源：互联网发布：php imagepng 编辑：程序博客网时间：2024/06/08 08:26

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 mainimport ("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 := outfor 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 := outfor 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)%blockSizepadtext := 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)]}

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