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当我尝试再次解密相同的字节片时,我遇到解密问题。的代码为澄清三重DES解密在再次解密时返回错误的前16个字节
实施例:
package main
import (
"fmt"
"crypto/cipher"
"crypto/des"
)
const (
// tripleKey is TripleDES key string (3x8 bytes)
tripleKey = "12345678asdfghjkzxcvbnmq"
)
var (
encrypter cipher.BlockMode
decrypter cipher.BlockMode
)
func init() {
// tripleDESChiper is chiper block based on tripleKey used for encryption/decryption
tripleDESChiper, err := des.NewTripleDESCipher([]byte(tripleKey))
if err != nil {
panic(err)
}
// iv is Initialization Vector used for encrypter/decrypter creation
ciphertext := []byte("qwerty")
iv := ciphertext[:des.BlockSize]
// create encrypter and decrypter
encrypter = cipher.NewCBCEncrypter(tripleDESChiper, iv)
decrypter = cipher.NewCBCDecrypter(tripleDESChiper, iv)
}
func main() {
message := "12345678qwertyuia12345678zxcvbnm,12345678poiuytr"
data := []byte(message)
hash := encrypt(data)
decoded1 := decrypt(hash)
decoded2 := decrypt(hash)
decoded3 := decrypt(hash)
decoded4 := decrypt(hash)
fmt.Printf("encrypted data : %x\n", data)
fmt.Printf("1 try of decryption result : %x\n", decoded1)
fmt.Printf("2 try of decryption result : %x\n", decoded2)
fmt.Printf("3 try of decryption result : %x\n", decoded3)
fmt.Printf("4 try of decryption result : %x\n", decoded4)
}
func encrypt(msg []byte) []byte {
encrypted := make([]byte, len(msg))
encrypter.CryptBlocks(encrypted, msg)
return encrypted
}
func decrypt(hash []byte) []byte {
decrypted := make([]byte, len(hash))
decrypter.CryptBlocks(decrypted, hash)
return decrypted
}
此代码也可以和上the playground可运行 。
它提供了以下结果:
encrypted data : 313233343536373871776572747975696131323334353637387a786376626e6d2c3132333435363738706f6975797472
1 try of decryption result : 313233343536373871776572747975696131323334353637387a786376626e6d2c3132333435363738706f6975797472
2 try of decryption result : 5e66fa74456402c271776572747975696131323334353637387a786376626e6d2c3132333435363738706f6975797472
3 try of decryption result : 5e66fa74456402c271776572747975696131323334353637387a786376626e6d2c3132333435363738706f6975797472
4 try of decryption result : 5e66fa74456402c271776572747975696131323334353637387a786376626e6d2c3132333435363738706f6975797472
正如你所看到的第一解密运作良好,并返回有效的结果, 但所有其他尝试返回错误的结果。 结果的前16个字节不在源字节片中。
有人可以描述我做错了什么吗?
弗雷德里克,非常感谢!我只是重写我的代码,为每个迭代创建新的解密器,现在它工作正常。 – Yury