golang - DES加密ECB(模式)

Java默认DES算法使用DES/ECB/PKCS5Padding，而golang认为这种方式是不安全的，所以故意没有提供这种加密方式，那如果我们还是要用到怎么办？下面贴上golang版的DES ECB加密解密代码（默认对密文做了base64处理）。

1package main
2
3import (
4    log "ad-service/alog"
5    "bytes"
6    "crypto/des"
7    "encoding/base64" )
8
9func EntryptDesECB(data, key []byte) string { if len(key) > 8 {
10        key = key[:8]
11    }
12    block, err := des.NewCipher(key) if err != nil {
13        log.Errorf("EntryptDesECB newCipher error[%v]", err) return "" }
14    bs := block.BlockSize()
15    data = PKCS5Padding(data, bs) if len(data)%bs != 0 {
16        log.Error("EntryptDesECB Need a multiple of the blocksize") return "" } out := make([]byte, len(data))
17    dst := out
18    for len(data) > 0 {
19        block.Encrypt(dst, data[:bs])
20        data = data[bs:]
21        dst = dst[bs:]
22    } return base64.StdEncoding.EncodeToString(out)
23}
24func DecryptDESECB(d, key []byte) string {
25    data, err := base64.StdEncoding.DecodeString(d) if err != nil {
26        log.Errorf("DecryptDES Decode base64 error[%v]", err) return "" } if len(key) > 8 {
27        key = key[:8]
28    }
29    block, err := des.NewCipher(key) if err != nil {
30        log.Errorf("DecryptDES NewCipher error[%v]", err) return "" }
31    bs := block.BlockSize() if len(data)%bs != 0 {
32        log.Error("DecryptDES crypto/cipher: input not full blocks") return "" } out := make([]byte, len(data))
33    dst := out
34    for len(data) > 0 {
35        block.Decrypt(dst, data[:bs])
36        data = data[bs:]
37        dst = dst[bs:]
38    } out = PKCS5UnPadding(out) return string(out)
39}
40
41func PKCS5Padding(ciphertext []byte, blockSize int) []byte {
42    padding := blockSize - len(ciphertext)%blockSize
43    padtext := bytes.Repeat([]byte{byte(padding)}, padding) return append(ciphertext, padtext...)
44}
45
46func PKCS5UnPadding(origData []byte) []byte {
47    length := len(origData)
48    unpadding := int(origData[length-1]) return origData[:(length - unpadding)]
49}