複習做UWP時涉及到的幾種加密簽名相關

    internal sealed class TripleDesEncryptHelper
    {

        //加/解密 第一步 
        //通過SymmetricKeyAlgorithmProvider的靜態方法OpenAlgorithm()得到一個SymmetricKeyAlgorithmProvider例項
        //該方法引數是要使用的加/解密演算法的名字
        internal static SymmetricKeyAlgorithmProvider syprd = SymmetricKeyAlgorithmProvider.OpenAlgorithm(SymmetricAlgorithmNames.TripleDesEcb);


        /// <summary>
        /// 加密函式
        /// </summary>
        /// <param name="data">需要加密的字串</param>
        /// <returns>返回加密後的結果</returns>
        public static string Encrypt(string data, string key)
        {
            string encryptedData = null;
            try
            {
                byte[] dataBytes = Encoding.UTF8.GetBytes(data);
                //這裡我自己寫了一個pkcs5對齊，不過後來有看到過C#pkcs5和pkcs7是一樣的說法，有待驗證
                byte[] pkcs5databytes = pkcs5(dataBytes);
                IBuffer databuffer = pkcs5databytes.AsBuffer();

                byte[] keyBytes = Convert.FromBase64String(key);
                IBuffer keybuffer = keyBytes.AsBuffer();
                //構造CryptographicKey
                CryptographicKey cryptographicKey = syprd.CreateSymmetricKey(keybuffer);
                //加密
                //Encrypt需要三個引數分別為加密使用的Key，需要加密的Data，以及向量IV
                //Des加密中Ecb模式和Cbc模式的區別就在於是否必須使用向量IV
                IBuffer cryptBuffer = CryptographicEngine.Encrypt(cryptographicKey, databuffer, null);      **************/
                byte[] enctyptedBytes = cryptBuffer.ToArray();
                //進行base64編碼
                encryptedData = Convert.ToBase64String(enctyptedBytes); 
            }
            catch (Exception ex)
            {
                DebugHelper.Log("TripleDesEncryptHelper.Encrypt", ex.Message);
            }
            return encryptedData.Trim();
        }

        /// <summary>
        /// 解密函式
        /// </summary>
        /// <param name="data">待解密的字串</param>
        /// <returns>解密後的資料</returns>
        public static string Decrypt(string data, string key)
        {
            string decryptedData = null;
            try
            {
                byte[] dataBytes = Convert.FromBase64String(data);
                IBuffer dataBuffer = dataBytes.AsBuffer();
                byte[] keyBytes = Convert.FromBase64String(key);
                IBuffer keybuffer = keyBytes.AsBuffer();
                CryptographicKey cryptographicKey = syprd.CreateSymmetricKey(keybuffer);
                IBuffer decryptedBuffer = CryptographicEngine.Decrypt(cryptographicKey, dataBuffer, null);
                decryptedData = CryptographicBuffer.ConvertBinaryToString(BinaryStringEncoding.Utf8, decryptedBuffer);
                //防止亂碼
                var result = System.Text.RegularExpressions.Regex.Match(decryptedData, "[a-zA-Z0-9]*");
                decryptedData = result.ToString();
            }
            catch (Exception ex)
            {
                DebugHelper.Log("TripleDesEncryptHelper.Decrypt", ex.Message);
            }
            return decryptedData;
        }




        /// <summary>
        /// 把資料進行pkcs5對齊
        /// </summary>
        /// <param name="databytes">待處理的資料</param>
        /// <returns></returns>
        private static byte[] pkcs5(byte[] databytes)
        {
            byte[] newBytes = null;

            int datalength = databytes.Length;
            int blocksize = (int)syprd.BlockLength;
            if (!(datalength % blocksize == 0))
            {
                int need = blocksize - (datalength % 8);
                newBytes = new byte[datalength + need];
                for (int i = 0; i < datalength; i++)
                {
                    newBytes[i] = databytes[i];
                }
                byte xx = 0x0;
                switch (need)
                {
                    case 1:
                        xx = 0x1;
                        break;
                    case 2:
                        xx = 0x2;
                        break;
                    case 3:
                        xx = 0x3;
                        break;
                    case 4:
                        xx = 0x4;
                        break;
                    case 5:
                        xx = 0x5;
                        break;
                    case 6:
                        xx = 0x6;
                        break;
                    case 7:
                        xx = 0x7;
                        break;
                }
                for (int i = 0; i < need; i++)
                {
                    newBytes[datalength + i] = xx;
                }
            }
            else
            {
                newBytes = new byte[datalength + 8];
                for (int i = 0; i < datalength; i++)
                {
                    newBytes[i] = databytes[i];
                }
                byte xx = 0x8;
                for (int i = 0; i < 8; i++)
                {
                    newBytes[datalength + i] = xx;
                }
            }
            return newBytes;
        }
}

internal sealed class Sha1SignHelper
    {
        /// <summary>
        /// 用sha1進行簽名
        /// </summary>
        /// <param name="data">需要簽名的資料</param>
        /// <param name="key">簽名私鑰</param>
        /// <returns></returns>
        internal static string Sha1Sign(string data, string key)
        {
            string signedData = null;
            IBuffer dataBuffer = Encoding.UTF8.GetBytes(data).AsBuffer();
            try
            {
                AsymmetricKeyAlgorithmProvider asymmetricAlgorithm = AsymmetricKeyAlgorithmProvider.OpenAlgorithm("RSASIGN_PKCS1_SHA1");
                //建立一個公鑰私鑰對
                CryptographicKey KeyPair = asymmetricAlgorithm.ImportKeyPair(CryptographicBuffer.DecodeFromBase64String(key), CryptographicPrivateKeyBlobType.Pkcs1RsaPrivateKey);
                //雜湊計算data
                HashAlgorithmProvider provider = HashAlgorithmProvider.OpenAlgorithm(Windows.Security.Cryptography.Core.HashAlgorithmNames.Sha1);
                IBuffer hashedData = provider.HashData(dataBuffer);
                //簽名
                IBuffer signedHashedBuffer = CryptographicEngine.SignHashedData(KeyPair, hashedData);
                signedData = CryptographicBuffer.EncodeToBase64String(signedHashedBuffer);
            }
            catch (Exception ex)
            {
                DebugHelper.Log("Sha1SignHelper.Sha1Sign", ex.Message);
            }
            return signedData;
        }

        internal static bool Sha1VerifySignature(string oldText, string signature, string publicKey)
        {
            bool dataCorrect = false;
            try
            {
                AsymmetricKeyAlgorithmProvider asymmetricAlgorithm = AsymmetricKeyAlgorithmProvider.OpenAlgorithm("RSASIGN_PKCS1_SHA1");
                //建立一個公鑰私鑰對
                IBuffer pubKeyBuffer = Convert.FromBase64String(publicKey).AsBuffer();
                CryptographicKey KeyPair = asymmetricAlgorithm.ImportPublicKey(CryptographicBuffer.DecodeFromBase64String(publicKey));
                // 驗證簽名（通過公鑰）
                IBuffer databuffer = CryptographicBuffer.ConvertStringToBinary(oldText, BinaryStringEncoding.Utf8); ;
                dataCorrect = CryptographicEngine.VerifySignature(KeyPair, databuffer, Convert.FromBase64String(signature).AsBuffer());
            }
            catch (Exception ex)
            {
                DebugHelper.Log("Sha1SignHelper.Sha1VerifySignature", ex.Message);
            }
            return dataCorrect;
        }
    }