在Golang中解密在Python AES CFB中加密的内容 [英] Decrypt in Golang what was encrypted in Python AES CFB
问题描述
基于有关CFB解密的Golang文档,我写了一个最小的工作示例来解密使用AES CFB加密的字符串,然后使用python3编码的base 64进行加密。
Based on the Golang documentation on CFB decryption I wrote a minimal working example to decrypt a string that was encrypted with AES CFB and then base 64 encoded in python3.
当消息在Golang中加密时,golang解密工作正常(使用来自Golang文档示例)。
但是,当我使用python crypto包在python脚本中加密消息时,无法在golang脚本中成功解密它。我没有得到正确的字节。
The golang decryption works fine when the message was encrypted within Golang (with the encryption function from the Golang doc example). However when I encrypt the message in a python script using the python crypto package, I am unable to decrypt it in the golang script successfully. I don't get the right bytes back.
$ python3 stack.py
Going to encrypt and base64 "This is not encrypted" result:
b'jf9A5LCxKWPuNb1XiH+G3APAgR//'
Now going to call the Golang script:
b'Hello from Golang, going to decrypt: jf9A5LCxKWPuNb1XiH+G3APAgR//
Result: Tl!\xca/\xf1\xc0\xb2\xd01Y\x02V\xec\xdf\xecy\xd38&\xd9\n'
两种AES实现的默认块大小均为16。
Blocksize is 16 by default for both AES implementations.
所以问题是:出了什么问题?
So the question: What is going wrong?
Golang脚本:
package main
import (
"crypto/aes"
"crypto/cipher"
"encoding/base64"
"fmt"
"os"
)
func main() {
key := []byte("TfvY7I358yospfWKcoviZizOShpm5hyH")
iv := []byte("mb13KcoviZizvYhp")
payload_python := os.Args[1]
fmt.Println("Hello from Golang, going to decrypt: "+payload_python+" Result: "+string(decrypt(key, payload_python, iv)))
}
func decrypt(key []byte, cryptoText string, iv []byte) []byte {
ciphertext, _ := base64.StdEncoding.DecodeString(cryptoText) //decode base64 coding
//prepare decryption based on key and iv
block, _ := aes.NewCipher(key)
stream := cipher.NewCFBDecrypter(block, iv)
//decrypt
stream.XORKeyStream(ciphertext, ciphertext)
return ciphertext
}
Python脚本:
#!/usr/bin/env python3
import base64
from Crypto.Cipher import AES
from subprocess import check_output
original_message = 'This is not encrypted'
key = 'TfvY7I358yospfWKcoviZizOShpm5hyH'
iv = 'mb13KcoviZizvYhp'
#prepare encryption
cfb_cipher_encrypt = AES.new(key, AES.MODE_CFB, iv)
#encrypt and base64 encode
encryptedpayload = base64.b64encode(cfb_cipher_encrypt.encrypt(original_message))
print('Going to encrypt and base64 "{}" result:\n{}\n'.format(original_message,encryptedpayload))
print('Now going to call the Golang script:')
print(check_output('go run stack.go {}'.format(encryptedpayload.decode()),shell=True))
推荐答案
尝试像这样从Python加密。
Try encrypting from Python like this.
然后可以从Go成功解密结果。
The result can then be unencrypted from Go successfully.
#!/usr/bin/env python3
import base64
from Crypto.Cipher import AES
MODE = AES.MODE_CFB
BLOCK_SIZE = 16
SEGMENT_SIZE = 128
def _pad_string(value):
length = len(value)
pad_size = BLOCK_SIZE - (length % BLOCK_SIZE)
return value.ljust(length + pad_size, '\x00')
def encrypt(key, iv, plaintext):
aes = AES.new(key, MODE, iv, segment_size=SEGMENT_SIZE)
plaintext = _pad_string(plaintext)
encrypted_text = aes.encrypt(plaintext)
return encrypted_text
key = 'TfvY7I358yospfWKcoviZizOShpm5hyH'
iv = 'mb13KcoviZizvYhp'
original_message = 'This is not encrypted'
encryptedpayload = base64.b64encode(encrypt(key, iv, original_message))
print('Going to encrypt and base64 "{}" result:\n{}\n'.format(original_message,encryptedpayload))
来源: http://chase-seibert.github.io/blog/2016/01/29/cryptojs-pycrypto-ios-aes256.html
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