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aescbc.go
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aescbc.go
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package goEncrypt
import (
"crypto/aes"
"crypto/cipher"
"log"
"runtime"
)
/*
@Time : 2018/11/1 22:53
@Author : wuman
@File : AES_CBC
@Software: GoLand
*/
/**
eencrypt
Note: the key length is 16 bytes
*/
func init(){
log.SetFlags(log.Ldate|log.Lshortfile)
}
// encrypt
func AesCbcEncrypt(plainText,key []byte,ivAes ...byte )([]byte,error){
if len(key) != 16 && len(key) != 24 && len(key) != 32{
return nil,ErrKeyLengthSixteen
}
block, err := aes.NewCipher(key)
if err!=nil{
return nil,err
}
paddingText := PKCS5Padding(plainText, block.BlockSize())
var iv []byte
if len(ivAes)!=0{
if len(ivAes)!=16{
return nil,ErrIvAes
}else{
iv=ivAes
}
}else{
iv =[]byte(ivaes)
} // To initialize the vector, it needs to be the same length as block.blocksize
blockMode := cipher.NewCBCEncrypter(block, iv)
cipherText := make([]byte,len(paddingText))
blockMode.CryptBlocks(cipherText,paddingText)
return cipherText,nil
}
// decrypt
func AesCbcDecrypt(cipherText,key []byte,ivAes ...byte) ([]byte,error){
if len(key) != 16 && len(key) != 24 && len(key) != 32{
return nil,ErrKeyLengthSixteen
}
block, err := aes.NewCipher(key)
if err!=nil{
return nil,err
}
defer func(){
if err:=recover();err!=nil{
switch err.(type){
case runtime.Error:
log.Println("runtime err:",err,"Check that the key or text is correct")
default:
log.Println("error:",err)
}
}
}()
var iv []byte
if len(ivAes)!=0{
if len(ivAes)!=16{
return nil,ErrIvAes
}else{
iv=ivAes
}
}else{
iv =[]byte(ivaes)
}
blockMode := cipher.NewCBCDecrypter(block, iv)
paddingText := make([]byte,len(cipherText))
blockMode.CryptBlocks(paddingText,cipherText)
plainText,err := PKCS5UnPadding(paddingText)
if err!=nil{
return nil,err
}
return plainText,nil
}