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  • silverlight中AES加密RijndaelManaged的使用

    因silverlight不支持DES(X509)加密,服务端与WPF本来是用X509加解密的,

    因为要兼容SL,所以改用AES来完成,但是不幸的是在silverlight中虽然支持AES却不支持RijndaelManaged类,

    只能使用AesManaged类来实现了,具体实现代码如下:
    /// <summary>
            /// 使用AES加密字符串
            /// </summary>
            /// <param name="encryptString">待加密字符串</param>
            /// <param name="encryptKey">加密密匙</param>
            /// <param name="salt">盐</param>
            /// <returns>加密结果,加密失败则返回源串</returns>
            public static string EncryptAES(string encryptString, string encryptKey, string salt)
            {
                AesManaged aes = null;
                MemoryStream ms = null;
                CryptoStream cs = null;

                try
                {
                    Rfc2898DeriveBytes rfc2898 = new Rfc2898DeriveBytes(encryptKey, Encoding.UTF8.GetBytes(salt));

                    aes = new AesManaged();
                    aes.Key = rfc2898.GetBytes(aes.KeySize / 8);
                    aes.IV = rfc2898.GetBytes(aes.BlockSize / 8);

                    ms = new MemoryStream();
                    cs = new CryptoStream(ms, aes.CreateEncryptor(), CryptoStreamMode.Write);

                    byte[] data = Encoding.UTF8.GetBytes(encryptString);
                    cs.Write(data, 0, data.Length);
                    cs.FlushFinalBlock();

                    return Convert.ToBase64String(ms.ToArray());
                }
                catch
                {
                    return encryptString;
                }
                finally
                {
                    if (cs != null)
                        cs.Close();

                    if (ms != null)
                        ms.Close();

                    if (aes != null)
                        aes.Clear();
                }
            }

            /// <summary>
            /// 使用AES解密字符串
            /// </summary>
            /// <param name="decryptString">待解密字符串</param>
            /// <param name="decryptKey">解密密匙</param>
            /// <param name="salt">盐</param>
            /// <returns>解密结果,解谜失败则返回源串</returns>
            public static string DecryptAES(string decryptString, string decryptKey, string salt)
            {
                AesManaged aes = null;
                MemoryStream ms = null;
                CryptoStream cs = null;

                try
                {
                    Rfc2898DeriveBytes rfc2898 = new Rfc2898DeriveBytes(decryptKey, Encoding.UTF8.GetBytes(salt));

                    aes = new AesManaged();
                    aes.Key = rfc2898.GetBytes(aes.KeySize / 8);
                    aes.IV = rfc2898.GetBytes(aes.BlockSize / 8);

                    ms = new MemoryStream();
                    cs = new CryptoStream(ms, aes.CreateDecryptor(), CryptoStreamMode.Write);

                    byte[] data = Convert.FromBase64String(decryptString);
                    cs.Write(data, 0, data.Length);
                    cs.FlushFinalBlock();

                    return Encoding.UTF8.GetString(ms.ToArray(), 0, ms.ToArray().Length);
                }
                catch
                {
                    return decryptString;
                }
                finally
                {
                    if (cs != null)
                        cs.Close();

                    if (ms != null)
                        ms.Close();

                    if (aes != null)
                        aes.Clear();
                }
            }

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  • 原文地址:https://www.cnblogs.com/zjoch/p/2708973.html
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