Objective-C AES文件加密解密

- (NSData *)AES128EncryptWithKey:(NSString *)key gIv:(NSString *)Iv{//加密
        char keyPtr[kCCKeySizeAES128+1];
        bzero(keyPtr, sizeof(keyPtr));
        [key getCString:keyPtr maxLength:sizeof(keyPtr) encoding:NSUTF8StringEncoding];
        
        char ivPtr[kCCKeySizeAES128+1];
        memset(ivPtr, 0, sizeof(ivPtr));
        [Iv getCString:ivPtr maxLength:sizeof(ivPtr) encoding:NSUTF8StringEncoding];
        
        NSUInteger dataLength = [self length];
        size_t bufferSize = dataLength + kCCBlockSizeAES128;
        void *buffer = malloc(bufferSize);
        size_t numBytesEncrypted = 0;
        CCCryptorStatus cryptStatus = CCCrypt(kCCEncrypt,
                                              kCCAlgorithmAES128,
                                              kCCOptionPKCS7Padding,
                                              keyPtr,
                                              kCCBlockSizeAES128,
                                              ivPtr,
                                              [self bytes],
                                              dataLength,
                                              buffer,
                                              bufferSize,
                                              &numBytesEncrypted);
        if (cryptStatus == kCCSuccess) {
            return [NSData dataWithBytesNoCopy:buffer length:numBytesEncrypted];
        }
        free(buffer);
        return nil;
        }
    
    
    
    
    
    
        
        - (NSData *)AES128DecryptWithKey:(NSString *)key gIv:(NSString *)Iv{//解密
        char keyPtr[kCCKeySizeAES128+1];
        bzero(keyPtr, sizeof(keyPtr));
        [key getCString:keyPtr maxLength:sizeof(keyPtr) encoding:NSUTF8StringEncoding];
        
        char ivPtr[kCCKeySizeAES128+1];
        memset(ivPtr, 0, sizeof(ivPtr));
        [Iv getCString:ivPtr maxLength:sizeof(ivPtr) encoding:NSUTF8StringEncoding];
        
        NSUInteger dataLength = [self length];
        size_t bufferSize = dataLength + kCCBlockSizeAES128;
        void *buffer = malloc(bufferSize);
        size_t numBytesDecrypted = 0;
        CCCryptorStatus cryptStatus = CCCrypt(kCCDecrypt,
                                              kCCAlgorithmAES128,
                                              kCCOptionPKCS7Padding,
                                              keyPtr,
                                              kCCBlockSizeAES128,
                                              ivPtr,
                                              [self bytes],
                                              dataLength,
                                              buffer,
                                              bufferSize,
                                              &numBytesDecrypted);
        if (cryptStatus == kCCSuccess) {
            return [NSData dataWithBytesNoCopy:buffer length:numBytesDecrypted];
        }
        free(buffer);
        return nil;
          }

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