使用CommonCrypto进行Swift AES加密

Question

我正在使用Swift 2.1在XCode 7.1上开发iOS应用程序,我正在尝试使用CommonCrypto库使用AES 128位和PKCS7填充进行简单加密.

代码工作,但每次我尝试将NSData对象转换NSString为String然后我得到一个零,应用程序崩溃.

我调试了应用程序,NSData对象不是零.

当我尝试解包String可选时,会发生错误.

如何解决这个问题？并将NSData对象正确转换为String？这是我的代码

static func AESEncryption(phrase: String,key: String,ivKey: String,encryptOrDecrypt: Bool) -> String {

let phraseData = phrase.dataUsingEncoding(NSUTF8StringEncoding)
let ivData = ivKey.dataUsingEncoding(NSUTF8StringEncoding)
    let keyData: NSData! = key.dataUsingEncoding(NSUTF8StringEncoding, allowLossyConversion: false)!
    let keyBytes         = UnsafePointer<Void>(keyData.bytes)
    let keyLength        = size_t(kCCKeySizeAES128)
    let dataLength       = Int(phraseData!.length)
    let dataBytes        = UnsafePointer<Void>(phraseData!.bytes)
    let bufferData       = NSMutableData(length: Int(dataLength) + kCCBlockSizeAES128)!
    let bufferPointer    = UnsafeMutablePointer<Void>(bufferData.mutableBytes)
    let bufferLength     = size_t(bufferData.length)
    let ivBuffer         = UnsafePointer<Void>(ivData!.bytes)
    var bytesDecrypted   = Int(0)

    let operation = encryptOrDecrypt ? UInt32(kCCEncrypt) : UInt32(kCCDecrypt)

    let algorithm:  CCAlgorithm = UInt32(kCCAlgorithmAES128)
    let options:   CCOptions   = UInt32(kCCOptionPKCS7Padding)

    let cryptStatus = CCCrypt(
        operation,
        algorithm,
        options,
        keyBytes,
        keyLength,
        ivBuffer,
        dataBytes,
        dataLength,
        bufferPointer,
        bufferLength,
        &bytesDecrypted)
    if Int32(cryptStatus) == Int32(kCCSuccess) {
        bufferData.length = bytesDecrypted

        let data = bufferData as NSData
        let stringData =  String(data: data,encoding: NSUTF8StringEncoding)
        print("After Operation: \(stringData)")
        return stringData!
    } else {
        print("Encryption Error: \(cryptStatus)")
    }
    return "";
}

Answer 1

加密数据不是有效的UTF-8字符串,因为它应该与随机位无法区分.如果你需要它以字符串形式,你需要做类似base64编码或写出字节的十六进制值.

NSData有一个base64EncodedDataWithOptions方法应该产生一个字符串.