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Copy pathdes.go
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108 lines (98 loc) · 2.32 KB
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package des
import (
"bytes"
"crypto/cipher"
"crypto/des"
"errors"
)
//ECB PKCS5Padding
func PKCS5Padding(ciphertext []byte, blockSize int) []byte {
padding := blockSize - len(ciphertext)%blockSize
padtext := bytes.Repeat([]byte{byte(padding)}, padding)
return append(ciphertext, padtext...)
}
//ECB PKCS5UnPadding
func PKCS5UnPadding(origData []byte) []byte {
length := len(origData)
unpadding := int(origData[length-1])
return origData[:(length - unpadding)]
}
//ECB Des加密
func ECBEncrypt(origData, key []byte) ([]byte, error) {
if len(origData) < 1 || len(key) < 1 {
return nil, errors.New("wrong data or key")
}
block, err := des.NewCipher(key)
if err != nil {
return nil, err
}
origData = PKCS5Padding(origData, block.BlockSize())
blockMode := cipher.NewCBCEncrypter(block, key)
crypted := make([]byte, len(origData))
blockMode.CryptBlocks(crypted, origData)
return crypted, nil
}
//ECB Des解密
func ECBDecrypt(crypted, key []byte) ([]byte, error) {
if len(crypted) < 1 || len(key) < 1 {
return nil, errors.New("wrong data or key")
}
block, err := des.NewCipher(key)
if err != nil {
return nil, err
}
blockMode := cipher.NewCBCDecrypter(block, key)
origData := make([]byte, len(crypted))
blockMode.CryptBlocks(origData, crypted)
origData = PKCS5UnPadding(origData)
return origData, nil
}
//[golang ECB 3DES Encrypt]
func TripleEcbDesEncrypt(origData, key []byte) ([]byte, error) {
tkey := make([]byte, 24, 24)
copy(tkey, key)
k1 := tkey[:8]
k2 := tkey[8:16]
k3 := tkey[16:]
block, err := des.NewCipher(k1)
if err != nil {
return nil, err
}
bs := block.BlockSize()
origData = PKCS5Padding(origData, bs)
buf1, err := ECBEncrypt(origData, k1)
if err != nil {
return nil, err
}
buf2, err := ECBDecrypt(buf1, k2)
if err != nil {
return nil, err
}
out, err := ECBEncrypt(buf2, k3)
if err != nil {
return nil, err
}
return out, nil
}
//[golang ECB 3DES Decrypt]
func TripleEcbDesDecrypt(crypted, key []byte) ([]byte, error) {
tkey := make([]byte, 24, 24)
copy(tkey, key)
k1 := tkey[:8]
k2 := tkey[8:16]
k3 := tkey[16:]
buf1, err := ECBDecrypt(crypted, k3)
if err != nil {
return nil, err
}
buf2, err := ECBEncrypt(buf1, k2)
if err != nil {
return nil, err
}
out, err := ECBDecrypt(buf2, k1)
if err != nil {
return nil, err
}
out = PKCS5UnPadding(out)
return out, nil
}