Python中的AES加密与iOS不同

Question

我正在尝试在iOS上加密一个字符串，然后把它发送到一个TCP服务器。下面是Python版本和iOS版本的代码。请看一下这两个版本的输出结果。它们看起来很相似，但长度却不同，我不知道原因是什么。有没有人能帮我看看，可能是什么原因呢？

请注意，Python脚本中的填充（PADDING）应该被忽略，因为我已经给出了16的文本长度。

PYTHON代码：

     #!/usr/bin/env python

     from Crypto.Cipher import AES
     import base64
     import os

     # the block size for the cipher object; must be 16, 24, or 32 for AES
     BLOCK_SIZE = 16

     PADDING = '{'

     # one-liner to sufficiently pad the text to be encrypted
     pad = lambda s: s + (BLOCK_SIZE - len(s) % BLOCK_SIZE) * PADDING

     # one-liners to encrypt/encode and decrypt/decode a string
     # encrypt with AES, encode with base64
     EncodeAES = lambda c, s: base64.b64encode(c.encrypt(pad(s)))
     DecodeAES = lambda c, e: c.decrypt(base64.b64decode(e)).rstrip(PADDING)


     secret = "1234567890123456" 

     # create a cipher object using the random secret
     cipher = AES.new(secret)

     encoded = EncodeAES(cipher, 'password12345678')
     print 'Encrypted string:', encoded

     decoded = DecodeAES(cipher, encoded)
     print 'Decrypted string:', decoded

输出：

加密字符串：57AayWF4jKYx7KzGkwudIBZUsn1ULOC0C4c5YF3xeI8=

解密字符串：password12345678

NSString *forKey=@"1234567890123456";
NSString *mystr =@"password12345678";
const char *utfString = [mystr UTF8String];
NSData *aData=[NSData dataWithBytes: utfString length: strlen(utfString)];
aData=[mystr dataUsingEncoding:NSUTF8StringEncoding];
NSData *data;//=[aData AES128EncryptWithKey:forKey];
data=[aData AES128EncryptWithKey:forKey];

NSString *base64 = [data base64EncodedString];

aData=[data AES128DecryptWithKey:forKey];
mystr=[[NSString alloc] initWithData:aData encoding:NSUTF8StringEncoding];

NSLog(@"AES data : %@  \n %@",mystr,base64 );

输出：

AES数据：password12345678
57AayWF4jKYx7KzGkwudIKNlwA+HErrmiy1Z0szzZds=

Answer 1

好的，事情就是这样的。感谢sarnold给的提示 :)

from Crypto.Cipher import AES
import base64
import os

    # the block size for the cipher object; must be 16, 24, or 32 for AES
    BLOCK_SIZE = 16
    mode = AES.MODE_CBC
    secret = "1234567890123456" #os.urandom(BLOCK_SIZE)

    # create a cipher object using the random secret
    cipher = AES.new(secret,mode)

    # encode a string
    #tx=cipher.encrypt('1234567890123456')
    #print base64.b64encode(tx)

    myData='aaaaaaaaaaaaaaaa'
    #encoded = EncodeAES(cipher, myData)
    encoded = cipher.encrypt(myData)
    print 'Encrypted string:', base64.b64encode(encoded)
    mode = AES.MODE_ECB
    cipher=AES.new(secret,mode)
    decoded = cipher.decrypt(encoded)
    print 'Decrypted string:', decoded

Python 输出：

加密后的字符串：C9pEG6g8ge76xt2q9XLbpw==

解密后的字符串：aaaaaaaaaaaaaaaa

*在iOS中将AES的CCOptions改为了kCCOptionECBMode。*

CCCryptorStatus cryptStatus = CCCrypt(kCCEncrypt, kCCAlgorithmAES128, kCCOptionECBMode,keyPtr, CCKeySizeAES128, NULL,[self bytes], dataLength,  buffer, bufferSize,  &numBytesEncrypted);

现在的输出是：

iOS 输出：

AES数据：aaaaaaaaaaaaaaaa
C9pEG6g8ge76xt2q9XLbpw==