解密來自PHP的Objective-C中的AES128/CBC

Question

我是xcode和Objective-C的新手。我編寫了一個QR掃描器，現在我需要解密用AES128 CBC加密的數據。我使用這段代碼在php中加密明文：http://www.androidsnippets.com/encrypt-decrypt-between-android-and-php

你能幫我嗎？對不起，我的英文不好，我是德國人：d

Answer 1

使用CommonCrypto，見CommonCrypto和CCCryptor

這裏是一個SNIPPIT讓你開始：

+ (NSData *)doCipher:(NSData *)dataIn 
        iv:(NSData *)iv 
       key:(NSData *)symmetricKey 
      context:(CCOperation)encryptOrDecrypt 
       error:(NSError **)error 
{ 
    CCCryptorStatus ccStatus = kCCSuccess; 
    size_t   cryptBytes = 0; // Number of bytes moved to buffer. 
    NSMutableData *dataOut = [NSMutableData dataWithLength:dataIn.length + kCCBlockSizeAES128]; 

    ccStatus = CCCrypt(encryptOrDecrypt, 
         kCCAlgorithmAES128, 
         kCCOptionPKCS7Padding, 
         symmetricKey.bytes, 
         kCCKeySizeAES128, 
         iv.bytes, 
         dataIn.bytes, 
         dataIn.length, 
         dataOut.mutableBytes, 
         dataOut.length, 
         &cryptBytes); 

    if (ccStatus == kCCSuccess) { 
     dataOut.length = cryptBytes; 
    } 
    else { 
     if (error) { 
      *error = [NSError errorWithDomain:@"kEncryptionError" 
             code:ccStatus 
            userInfo:nil]; 
     } 
     dataOut = nil; 
    } 

    return dataOut; 
} 

也看到RNCryptor的全面實施。