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aes.go
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aes.go
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package cryptlib
import (
"crypto/aes"
"crypto/cipher"
"encoding/base64"
"github.com/suiyunonghen/DxCommonLib"
)
type AES struct {
fInitVector []byte //CBC初始化向量
}
func NewAes(initvector []byte)*AES {
return &AES{fInitVector:initvector}
}
func (aestool *AES)ResetVector(vector []byte) {
aestool.fInitVector = vector
}
func (aestool *AES)Encrypt(key,value []byte)([]byte,error) {
var realkey []byte
btlen := len(key)
if btlen < 16{
realkey = append(key,make([]byte,16-btlen)...)
}else{
realkey = key[:16]
}
block, err := aes.NewCipher(realkey[:16])
if err != nil {
return nil,err
}
blockSize := block.BlockSize()
value = PKCS5Padding(value, blockSize)
blockMode := cipher.NewCBCEncrypter(block, aestool.fInitVector[:blockSize])
crypted := make([]byte, len(value))
// 根据CryptBlocks方法的说明,如下方式初始化crypted也可以
blockMode.CryptBlocks(crypted, value)
return crypted,nil
}
func (aestool *AES)EncryptBase64(key,value []byte)(string,error) {
crypted,err := aestool.Encrypt(key,value)
if err != nil{
return "",err
}
return base64.StdEncoding.EncodeToString(crypted),nil
}
func (aestool *AES)EncryptHex(key,value []byte)(string,error) {
crypted,err := aestool.Encrypt(key,value)
if err != nil{
return "",err
}
return DxCommonLib.Bin2Hex(crypted),nil
}
func (aestool *AES)DecryptBase64(value,key string) string {
var realkey []byte
bt := []byte(key)
btlen := len(bt)
if btlen < 16{
realkey = append(bt,make([]byte,16-btlen)...)
}else{
realkey = bt[:16]
}
block, err := aes.NewCipher(realkey[:16])
if err != nil {
return value
}
var vbyte []byte
vbyte,err = base64.StdEncoding.DecodeString(value)
if err != nil{
return value
}
blockSize := block.BlockSize()
blockMode := cipher.NewCBCDecrypter(block,aestool.fInitVector[:blockSize])
origData := make([]byte, len(vbyte))
blockMode.CryptBlocks(origData, vbyte)
origData = PKCS5UnPadding(origData)
if origData == nil{
return value
}
return string(origData)
}
func (aestool *AES)DecryptWithHex(value,key string) string {
var realkey []byte
bt := []byte(key)
btlen := len(bt)
if btlen < 16{
realkey = append(bt,make([]byte,16-btlen)...)
}else{
realkey = bt[:16]
}
block, err := aes.NewCipher(realkey[:16])
if err != nil {
return value
}
vbyte := DxCommonLib.Hex2Binary(value)
blockSize := block.BlockSize()
blockMode := cipher.NewCBCDecrypter(block,aestool.fInitVector[:blockSize])
origData := make([]byte, len(vbyte))
blockMode.CryptBlocks(origData, vbyte)
origData = PKCS5UnPadding(origData)
if origData == nil{
return value
}
return string(origData)
}
func (aestool *AES)Decrypt(value []byte,key string) []byte {
var realkey []byte
bt := []byte(key)
btlen := len(bt)
if btlen < 16{
realkey = append(bt,make([]byte,16-btlen)...)
}else{
realkey = bt[:16]
}
block, err := aes.NewCipher(realkey[:16])
if err != nil {
return value
}
blockSize := block.BlockSize()
blockMode := cipher.NewCBCDecrypter(block,aestool.fInitVector[:blockSize])
origData := make([]byte, len(value))
blockMode.CryptBlocks(origData, value)
origData = PKCS5UnPadding(origData)
if origData == nil{
return value
}
return origData
}