72 lines
1.5 KiB
Go
72 lines
1.5 KiB
Go
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package utils
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import (
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"bytes"
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"crypto/des"
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"encoding/hex"
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"errors"
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"fmt"
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)
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const (
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DES_CRYPT_KEY = "w$D5%8x@"
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)
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func DesEcbDecrypt(src string, key ...string) (result string, err error) {
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if len(key) == 0 {
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return DES_ECB{}.DecryptDES_ECB(src, DES_CRYPT_KEY)
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} else {
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return DES_ECB{}.DecryptDES_ECB(src, key[0])
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}
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}
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type DES_ECB struct {
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}
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//DecryptDES_ECB ECB解密
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func (d DES_ECB) DecryptDES_ECB(src, key string) (result string, err error) {
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defer func() {
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if defErr := recover(); defErr != nil {
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fmt.Printf("DecryptDES_ECB_V2 panic info:%v\n", defErr)
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result = ""
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err = errors.New("DecryptDES_ECB_V2 err")
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}
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}()
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data, err := hex.DecodeString(src)
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if err != nil {
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return "", err
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}
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keyByte := []byte(key)
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block, err := des.NewCipher(keyByte)
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if err != nil {
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return "", err
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}
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bs := block.BlockSize()
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if len(data)%bs != 0 {
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return "", errors.New("crypto/cipher: input not full blocks")
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}
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out := make([]byte, len(data))
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dst := out
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for len(data) > 0 {
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block.Decrypt(dst, data[:bs])
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data = data[bs:]
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dst = dst[bs:]
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}
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out = d.PKCS5UnPadding(out)
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return string(out), nil
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}
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//明文补码算法
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func (d DES_ECB) PKCS5Padding(ciphertext []byte, blockSize int) []byte {
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padding := blockSize - len(ciphertext)%blockSize
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padtext := bytes.Repeat([]byte{byte(padding)}, padding)
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return append(ciphertext, padtext...)
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}
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//明文减码算法
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func (d DES_ECB) PKCS5UnPadding(origData []byte) []byte {
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length := len(origData)
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unpadding := int(origData[length-1])
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return origData[:(length - unpadding)]
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}
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