1.本文采用微软的

RijndaelManaged

命名空间:: System.Security.Cryptography

Assemblies:: mscorlib.dll, netstandard.dll, System.Security.Cryptography.Algorithms.dll

访问的托管的版本Rijndael算法。此类不能被继承。

实现加密解密，

查看代码：

using System;

using System.IO;

using System.Security.Cryptography;

namespace RijndaelManaged_Example

{

    class RijndaelExample

    {

        public static void Main()

        {

            try

            {

                string original = "Here is some data to encrypt!";

                // Create a new instance of the RijndaelManaged

                // class.  This generates a new key and initialization

                // vector (IV).

                using (RijndaelManaged myRijndael = new RijndaelManaged())

                {

                    myRijndael.GenerateKey();

                    myRijndael.GenerateIV();

                    // Encrypt the string to an array of bytes.

                    byte[] encrypted = EncryptStringToBytes(original, myRijndael.Key, myRijndael.IV);

                    // Decrypt the bytes to a string.

                    string roundtrip = DecryptStringFromBytes(encrypted, myRijndael.Key, myRijndael.IV);

                    //Display the original data and the decrypted data.

                    Console.WriteLine("Original:   {0}", original);

                    Console.WriteLine("Round Trip: {0}", roundtrip);

                }

            }

            catch (Exception e)

            {

                Console.WriteLine("Error: {0}", e.Message);

            }

        }

        static byte[] EncryptStringToBytes(string plainText, byte[] Key, byte[] IV)

        {

            // Check arguments.

            if (plainText == null || plainText.Length <= )

                throw new ArgumentNullException("plainText");

            if (Key == null || Key.Length <= )

                throw new ArgumentNullException("Key");

            if (IV == null || IV.Length <= )

                throw new ArgumentNullException("IV");

            byte[] encrypted;

            // Create an RijndaelManaged object

            // with the specified key and IV.

            using (RijndaelManaged rijAlg = new RijndaelManaged())

            {

                rijAlg.Key = Key;

                rijAlg.IV = IV;

                // Create an encryptor to perform the stream transform.

                ICryptoTransform encryptor = rijAlg.CreateEncryptor(rijAlg.Key, rijAlg.IV);

                // Create the streams used for encryption.

                using (MemoryStream msEncrypt = new MemoryStream())

                {

                    using (CryptoStream csEncrypt = new CryptoStream(msEncrypt, encryptor, CryptoStreamMode.Write))

                    {

                        using (StreamWriter swEncrypt = new StreamWriter(csEncrypt))

                        {

                            //Write all data to the stream.

                            swEncrypt.Write(plainText);

                        }

                        encrypted = msEncrypt.ToArray();

                    }

                }

            }

            // Return the encrypted bytes from the memory stream.

            return encrypted;

        }

        static string DecryptStringFromBytes(byte[] cipherText, byte[] Key, byte[] IV)

        {

            // Check arguments.

            if (cipherText == null || cipherText.Length <= )

                throw new ArgumentNullException("cipherText");

            if (Key == null || Key.Length <= )

                throw new ArgumentNullException("Key");

            if (IV == null || IV.Length <= )

                throw new ArgumentNullException("IV");

            // Declare the string used to hold

            // the decrypted text.

            string plaintext = null;

            // Create an RijndaelManaged object

            // with the specified key and IV.

            using (RijndaelManaged rijAlg = new RijndaelManaged())

            {

                rijAlg.Key = Key;

                rijAlg.IV = IV;

                // Create a decryptor to perform the stream transform.

                ICryptoTransform decryptor = rijAlg.CreateDecryptor(rijAlg.Key, rijAlg.IV);

                // Create the streams used for decryption.

                using (MemoryStream msDecrypt = new MemoryStream(cipherText))

                {

                    using (CryptoStream csDecrypt = new CryptoStream(msDecrypt, decryptor, CryptoStreamMode.Read))

                    {

                        using (StreamReader srDecrypt = new StreamReader(csDecrypt))

                        {

                            // Read the decrypted bytes from the decrypting stream

                            // and place them in a string.

                            plaintext = srDecrypt.ReadToEnd();

                        }

                    }

                }

            }

            return plaintext;

        }

    }

}

这个加密乃微软官方案例。毛的问题

下面这个是错误的代码

       [Fact(DisplayName ="")]

        public void stat()

        {

            string original = "Here is some data to encrypt!";

            // Create a new instance of the RijndaelManaged

            // class.  This generates a new key and initialization

            // vector (IV).

            using (RijndaelManaged myRijndael = new RijndaelManaged())

            {

                myRijndael.GenerateKey();

                myRijndael.GenerateIV();

                // Encrypt the string to an array of bytes.

                byte[] encrypted = EncryptStringToBytes(original, myRijndael.Key, myRijndael.IV);

                myRijndael.GenerateKey();

                myRijndael.GenerateIV();

                // Decrypt the bytes to a string.

                string roundtrip = DecryptStringFromBytes(encrypted, myRijndael.Key, myRijndael.IV);

                //Display the original data and the decrypted data.

                Console.WriteLine("Original:   {0}", original);

                Console.WriteLine("Round Trip: {0}", roundtrip);

            }

        }

        /// <summary>

        ///

        /// </summary>

        /// <param name="plainText"></param>

        /// <param name="Key"></param>

        /// <param name="IV"></param>

        /// <returns></returns>

        static byte[] EncryptStringToBytes(string plainText, byte[] Key, byte[] IV)

        {

            // Check arguments.

            if (plainText == null || plainText.Length <= )

                throw new ArgumentNullException("plainText");

            if (Key == null || Key.Length <= )

                throw new ArgumentNullException("Key");

            if (IV == null || IV.Length <= )

                throw new ArgumentNullException("IV");

            byte[] encrypted;

            // Create an RijndaelManaged object

            // with the specified key and IV.

            using (RijndaelManaged rijAlg = new RijndaelManaged())

            {

                rijAlg.Key = Key;

                rijAlg.IV = IV;

                // Create an encryptor to perform the stream transform.

                ICryptoTransform encryptor = rijAlg.CreateEncryptor(rijAlg.Key, rijAlg.IV);

                // Create the streams used for encryption.

                using (MemoryStream msEncrypt = new MemoryStream())

                {

                    using (CryptoStream csEncrypt = new CryptoStream(msEncrypt, encryptor, CryptoStreamMode.Write))

                    {

                        using (StreamWriter swEncrypt = new StreamWriter(csEncrypt))

                        {

                            //Write all data to the stream.

                            swEncrypt.Write(plainText);

                        }

                        encrypted = msEncrypt.ToArray();

                    }

                }

            }

            // Return the encrypted bytes from the memory stream.

            return encrypted;

        }

        /// <summary>

        ///

        /// </summary>

        /// <param name="cipherText"></param>

        /// <param name="Key"></param>

        /// <param name="IV"></param>

        /// <returns></returns>

        static string DecryptStringFromBytes(byte[] cipherText, byte[] Key, byte[] IV)

        {

            // Check arguments.

            if (cipherText == null || cipherText.Length <= )

                throw new ArgumentNullException("cipherText");

            if (Key == null || Key.Length <= )

                throw new ArgumentNullException("Key");

            if (IV == null || IV.Length <= )

                throw new ArgumentNullException("IV");

            // Declare the string used to hold

            // the decrypted text.

            string plaintext = null;

            // Create an RijndaelManaged object

            // with the specified key and IV.

            using (RijndaelManaged rijAlg = new RijndaelManaged())

            {

                rijAlg.Key = Key;

                rijAlg.IV = IV;

                // Create a decryptor to perform the stream transform.

                ICryptoTransform decryptor = rijAlg.CreateDecryptor(rijAlg.Key, rijAlg.IV);

                // Create the streams used for decryption.

                using (MemoryStream msDecrypt = new MemoryStream(cipherText))

                {

                    using (CryptoStream csDecrypt = new CryptoStream(msDecrypt, decryptor, CryptoStreamMode.Read))

                    {

                        using (StreamReader srDecrypt = new StreamReader(csDecrypt))

                        {

                            // Read the decrypted bytes from the decrypting stream

                            // and place them in a string.

                            plaintext = srDecrypt.ReadToEnd();

                        }

                    }

                }

            }

            return plaintext;

        }

我把唯一改动测试的地方做了个标记。因为加密前随机的key 跟解密后的key 不一致，所以导致了这个错误

防止踩坑，以及知道这个玩意的原理。

巴特西

C# 填充无效，无法被移除

RijndaelManaged

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