DES加密ECB(模式) golang

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）。

package main

import (
    log "ad-service/alog"
    "bytes"
    "crypto/des"
    "encoding/base64"
)

func EntryptDesECB(data, key []byte) string {
    if len(key) >  {
        key = key[:]
    }
    block, err := des.NewCipher(key)
    if err != nil {
        log.Errorf("EntryptDesECB newCipher error[%v]", err)
        return ""
    }
    bs := block.BlockSize()
    data = PKCS5Padding(data, bs)
    if len(data)%bs !=  {
        log.Error("EntryptDesECB Need a multiple of the blocksize")
        return ""
    }
    out := make([]byte, len(data))
    dst := out
    for len(data) >  {
        block.Encrypt(dst, data[:bs])
        data = data[bs:]
        dst = dst[bs:]
    }
    return base64.StdEncoding.EncodeToString(out)
}
func DecryptDESECB(d, key []byte) string {
    data, err := base64.StdEncoding.DecodeString(d)
    if err != nil {
        log.Errorf("DecryptDES Decode base64 error[%v]", err)
        return ""
    }
    if len(key) >  {
        key = key[:]
    }
    block, err := des.NewCipher(key)
    if err != nil {
        log.Errorf("DecryptDES NewCipher error[%v]", err)
        return ""
    }
    bs := block.BlockSize()
    if len(data)%bs !=  {
        log.Error("DecryptDES crypto/cipher: input not full blocks")
        return ""
    }
    out := make([]byte, len(data))
    dst := out
    for len(data) >  {
        block.Decrypt(dst, data[:bs])
        data = data[bs:]
        dst = dst[bs:]
    }
    out = PKCS5UnPadding(out)
    return string(out)
}

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-])
    return origData[:(length - unpadding)]
}