Swift中的图像加密

Question

我使用IDZSwiftCommonCrypto进行图像加密，使用StreamCryptor描述为GitHub页面上的示例：https://github.com/iosdevzone/IDZSwiftCommonCrypto

我无法成功解密。这是我的加密和解密代码(imageData来自UIImageView)。加密后的输出与输入不同(imageData与xx不同)。

加密：

func performImageEncryption(imageData: Data) -> Void {

        var inputStream = InputStream(data: imageData)

        let key = arrayFrom(hexString: "2b7e151628aed2a6abf7158809cf4f3c")

        var sc = StreamCryptor(operation:.encrypt, algorithm:.aes, options:.PKCS7Padding, key:key, iv:Array<UInt8>())

        var inputBuffer = Array<UInt8>(repeating:0, count:1024)
        var outputBuffer = Array<UInt8>(repeating:0, count:1024)

        inputStream.open()

        var cryptedBytes = 0

        var xx = Data()

        var count = 0

        while inputStream.hasBytesAvailable
        {
            count = count + 1024
            let bytesRead = inputStream.read(&inputBuffer, maxLength: inputBuffer.count)
            let status = sc.update(bufferIn: inputBuffer, byteCountIn: bytesRead, bufferOut: &outputBuffer, byteCapacityOut: outputBuffer.count, byteCountOut: &cryptedBytes)

            xx.append(contentsOf: outputBuffer)
        }

        let status = sc.final(bufferOut: &outputBuffer, byteCapacityOut: outputBuffer.count, byteCountOut: &cryptedBytes)


        xx.append(contentsOf: outputBuffer)


        inputStream.close()

        performImageDecryption(encryptedImageData: xx)


    }

解密：

func performImageDecryption(encryptedImageData: Data) -> Void {

        let key = arrayFrom(hexString: "2b7e151628aed2a6abf7158809cf4f3c")

        var sc = StreamCryptor(operation:.decrypt, algorithm:.aes, options:.PKCS7Padding, key:key, iv:Array<UInt8>())

        var inputStreamD = InputStream(data: encryptedImageData)

        var inputBuffer = Array<UInt8>(repeating:0, count:1024)
        var outputBuffer = Array<UInt8>(repeating:0, count:1024)

        inputStreamD.open()

        var cryptedBytes = 0


        var xx = Data()
        while inputStreamD.hasBytesAvailable
        {
            let bytesRead = inputStreamD.read(&inputBuffer, maxLength: inputBuffer.count)
            let status = sc.update(bufferIn: inputBuffer, byteCountIn: bytesRead, bufferOut: &outputBuffer, byteCapacityOut: outputBuffer.count, byteCountOut: &cryptedBytes)
            xx.append(contentsOf: outputBuffer)
        }

        let status = sc.final(bufferOut: &outputBuffer, byteCapacityOut: outputBuffer.count, byteCountOut: &cryptedBytes)
        xx.append(contentsOf: outputBuffer)

        inputStreamD.close()

    }

Answer 1

xx.append(outputBuffer, count: cryptedBytes)

应该能帮上忙。

下面是用于获取加密图像文件并返回数据的示例代码。

func decryptImage(from path:URL)-> Data? {
    var decryptData = Data()

    let sc = StreamCryptor(operation:.decrypt, algorithm:.aes, options:.PKCS7Padding, key:key, iv:iv)

    guard let encryptedInputStream = InputStream(fileAtPath: path.relativePath) else {
        return nil
    }

    var inputBuffer = [UInt8](repeating: 0, count: Int(1024))
    var outputBuffer = [UInt8](repeating: 0, count: Int(1024))

    encryptedInputStream.open()

    var cryptedBytes : Int = 0
    while encryptedInputStream.hasBytesAvailable
    {
        let bytesRead = encryptedInputStream.read(&inputBuffer, maxLength: inputBuffer.count)

        let status = sc.update(bufferIn: inputBuffer, byteCountIn: bytesRead, bufferOut: &outputBuffer, byteCapacityOut: outputBuffer.count, byteCountOut: &cryptedBytes)

        if (status != Status.success) {
        encryptedInputStream.close()
            return nil
        }

        if(cryptedBytes > 0)
        {
            decryptData.append(outputBuffer, count: cryptedBytes)
        }
    }

    let status = sc.final(bufferOut: &outputBuffer, byteCapacityOut: outputBuffer.count, byteCountOut: &cryptedBytes)
    if (status != Status.success) {
        encryptedInputStream.close()
        return nil
    }

    if(cryptedBytes > 0)
    {
        decryptData.append(outputBuffer, count: cryptedBytes)
    }
    encryptedInputStream.close()
    return decryptData
}

快乐编码:)