" CFB1(Cipher Feedback Mode 1)是一种加密模式,它基于CFB(Cipher Feedback)模式。CFB模式是对称加密算法的一种分组模式,它将加密算法产生的密文与上一分组的密文进行XOR操作,然后将结果反馈给加密算法作为下一分组的明文。
以下是使用Go语言实现CFB1模式的示例代码:
```go
package main
import (
"crypto/aes"
"crypto/cipher"
"crypto/rand"
"encoding/hex"
"fmt"
)
func main() {
key := []byte("0123456789abcdef")
iv := []byte("0123456789abcdef")
plaintext := []byte("Hello, World!")
ciphertext := encryptCFB1(plaintext, key, iv)
decrypted := decryptCFB1(ciphertext, key, iv)
fmt.Println("Plaintext:", string(plaintext))
fmt.Println("Ciphertext:", hex.EncodeToString(ciphertext))
fmt.Println("Decrypted:", string(decrypted))
}
func encryptCFB1(plaintext, key, iv []byte) []byte {
blockSize := aes.BlockSize
ciphertext := make([]byte, len(plaintext)+blockSize)
encryptor := cipher.NewCBCEncrypter(aes.NewCipher(key), iv)
encryptor.Encrypt(ciphertext[:blockSize], plaintext)
for i := blockSize; i < len(ciphertext); i++ {
ciphertext[i] = ciphertext[i-blockSize] ^ iv[i%blockSize]
}
return ciphertext
}
func decryptCFB1(ciphertext, key, iv []byte) []byte {
blockSize := aes.BlockSize
plaintext := make([]byte, len(ciphertext)-blockSize)
decryptor := cipher.NewCBCDecrypter(aes.NewCipher(key), iv)
decryptor.Decrypt(plaintext, ciphertext[blockSize:])
for i := 0; i < len(plaintext); i++ {
plaintext[i] = plaintext[i] ^ ciphertext[i+blockSize]
}
return plaintext
}
```
这个示例中使用了AES加密算法,首先定义了密钥和初始化向量(IV),然后定义了一段明文。使用`encryptCFB1`函数对明文进行加密,再使用`decryptCFB1`函数对加密后的密文进行解密。
`encryptCFB1`和`decryptCFB1`函数都使用了Go语言的`crypto/cipher`包中的`CBCEncrypter`和`CBCDecrypter`类。在加密过程中,将明文与上一分组的密文进行XOR操作,然后将结果作为下一分组的明文。在解密过程中,先将密文与上一分组的明文进行XOR操作,然后得到解密后的明文。"