iOS之AES加密解密

#import

#import

//AES128位加密 base64编码 注：kCCKeySizeAES128点进去可以更换256位加密

//加密
 -(NSString *)AES128Encrypt:(NSString *)plainText key:(NSString *)key
{ char keyPtr[kCCKeySizeAES128+1];//
    memset(keyPtr, 0, sizeof(keyPtr));
    [key getCString:keyPtr maxLength:sizeof(keyPtr) encoding:NSUTF8StringEncoding];

    NSData* data = [plainText dataUsingEncoding:NSUTF8StringEncoding];
    NSUInteger dataLength = [data length];

    size_t bufferSize = dataLength + kCCBlockSizeAES128; void *buffer = malloc(bufferSize);
    size_t numBytesEncrypted = 0;
    CCCryptorStatus cryptStatus = CCCrypt(kCCEncrypt,
                                          kCCAlgorithmAES128,
                                          kCCOptionPKCS7Padding|kCCOptionECBMode,
                                          keyPtr,
                                          kCCBlockSizeAES128,
                                          NULL,
                                          [data bytes],
                                          dataLength,
                                          buffer,
                                          bufferSize, &numBytesEncrypted); if (cryptStatus == kCCSuccess) {
        NSData *resultData = [NSData dataWithBytesNoCopy:buffer length:numBytesEncrypted];

        NSString *stringBase64 = [resultData base64EncodedStringWithOptions:NSDataBase64EncodingEndLineWithLineFeed]; // base64格式的字符串
        return stringBase64;

    }
    free(buffer); return nil;
} 

//解密
-(NSString *)AES128Decrypt:(NSString *)encryptText key:(NSString *)key
{ char keyPtr[kCCKeySizeAES128 + 1];
    memset(keyPtr, 0, sizeof(keyPtr));
    [key getCString:keyPtr maxLength:sizeof(keyPtr) encoding:NSUTF8StringEncoding];

    NSData *data = [[NSData alloc] initWithBase64EncodedString:encryptText options:NSDataBase64DecodingIgnoreUnknownCharacters];//base64解码

    NSUInteger dataLength = [data length];
    size_t bufferSize = dataLength + kCCBlockSizeAES128; void *buffer = malloc(bufferSize);

    size_t numBytesCrypted = 0;
    CCCryptorStatus cryptStatus = CCCrypt(kCCDecrypt,
                                          kCCAlgorithmAES128,
                                          kCCOptionPKCS7Padding|kCCOptionECBMode,
                                          keyPtr,
                                          kCCBlockSizeAES128,
                                          NULL,
                                          [data bytes],
                                          dataLength,
                                          buffer,
                                          bufferSize, &numBytesCrypted); if (cryptStatus == kCCSuccess) {
        NSData *resultData = [NSData dataWithBytesNoCopy:buffer length:numBytesCrypted]; return [[NSString alloc] initWithData:resultData encoding:NSUTF8StringEncoding];
    }
    free(buffer); return nil;
}