iOS 开发之路（AES/DES加密实现） 三

class CrypTools: NSObject {
    internal func cryptoOperation() -> String {
        // Validation checks.
        let jm = "fjdkasljfkls"
        let jmData = jm.data(using: String.Encoding.utf8)!
        let key = "\n\u{0014}\u{001E}(2<FP" //这里是java端对应的key byte[]的字符串表现形式 btye[] key = {10, 20, 30, 40, 50, 60 ,70, 80}
        var t:String = ""
        
        // Prepare data parameters
        let keyData: Data! = key.data(using: String.Encoding.utf8, allowLossyConversion: false)!
        let keyBytes = keyData.withUnsafeBytes { (bytes: UnsafePointer<UInt8>) -> UnsafePointer<UInt8> in
            return bytes
        }
        
        //let keyBytes         = keyData.bytes.bindMemory(to: Void.self, capacity: keyData.count)
        let dataLength       = Int(jmData.count)
        let dataBytes        = jmData.withUnsafeBytes { (bytes: UnsafePointer<UInt8>) -> UnsafePointer<UInt8> in
            return bytes
        }

        
        var bufferData       = Data(count: Int(dataLength) + 8)
        let bufferPointer    = bufferData.withUnsafeMutableBytes { (bytes: UnsafeMutablePointer<UInt8>) -> UnsafeMutablePointer<UInt8> in
            return bytes
        }
        let bufferLength     = size_t(bufferData.count)
        let ivStr = "\u{000B}\u{0016}!,7BMU" //这里是java端对应的iv变量字符串
        let iv = ivStr.data(using: String.Encoding.utf8)!
        let ivBuffer: UnsafePointer<UInt8>? = iv.withUnsafeBytes({ (bytes: UnsafePointer<UInt8>) -> UnsafePointer<UInt8> in
            return bytes
        })
        var bytesDecrypted   = Int(0)
        // Perform operation
        let cryptStatus = CCCrypt(
            0,                  // Operation 这里代表DES加密而非解密
            1,    // Algorithm 这里代表DES算法（其他数字可以是别的算法，如AES），研究一下OC的自带的方法就行了
            1,                    // Options 这里代表PKCS7Padding
            keyBytes,                   // key data
            8,                  // key length 
            ivBuffer,                   // IV buffer
            dataBytes,                  // input data
            dataLength,                 // input length
            bufferPointer,              // output buffer
            bufferLength,               // output buffer length
            &bytesDecrypted)            // output bytes decrypted real length
        if Int32(cryptStatus) == Int32(kCCSuccess) {
            bufferData.count = bytesDecrypted // Adjust buffer size to real bytes
            print(bufferData)
            let a = bufferData.withUnsafeBytes{
                [UInt8](UnsafeBufferPointer(start: $0, count: bufferData.count))
            }
            print(a)
            t = bufferData.base64EncodedString()
        }
        return t
    }

}