对3DES加密的运用的一个简单示例

命名空间
using System.Security.Cryptography;
对称算法的机密密钥
  private const string sKey = "123"; 
对称算法的初始化向量
  private const string sIV = "abc";
加密

public static string EncryptString(string Value)
        {
            SymmetricAlgorithm mCSP = new TripleDESCryptoServiceProvider();
            ICryptoTransform ct;
            MemoryStream ms;
            CryptoStream cs;
            byte[] byt;

            mCSP.Key = Convert.FromBase64String(sKey);
            mCSP.IV = Convert.FromBase64String(sIV);
            mCSP.Mode = System.Security.Cryptography.CipherMode.ECB;
            mCSP.Padding = System.Security.Cryptography.PaddingMode.PKCS7;

            ct = mCSP.CreateEncryptor(mCSP.Key, mCSP.IV);
            byt = Encoding.UTF8.GetBytes(Value);
            ms = new MemoryStream();
            cs = new CryptoStream(ms, ct, CryptoStreamMode.Write);
            cs.Write(byt, 0, byt.Length);
            cs.FlushFinalBlock();
            cs.Close();

            return Convert.ToBase64String(ms.ToArray());
        }

解密

public static string DecryptString(string Value)
        {
            SymmetricAlgorithm mCSP = new TripleDESCryptoServiceProvider();
            ICryptoTransform ct;
            MemoryStream ms;
            CryptoStream cs;
            byte[] byt;

            mCSP.Key = Convert.FromBase64String(sKey);
            mCSP.IV = Convert.FromBase64String(sIV);
            mCSP.Mode = System.Security.Cryptography.CipherMode.ECB;
            mCSP.Padding = System.Security.Cryptography.PaddingMode.PKCS7;
            ct = mCSP.CreateDecryptor(mCSP.Key, mCSP.IV);
            byt = Convert.FromBase64String(Value);
            ms = new MemoryStream();
            cs = new CryptoStream(ms, ct, CryptoStreamMode.Write);
            cs.Write(byt, 0, byt.Length);
            cs.FlushFinalBlock();
            cs.Close();

            return Encoding.UTF8.GetString(ms.ToArray());
        }