Question

C#对字符串加密，加密后字符串小于原来的字符串，并能解密

Answer 1

public class StringEncrypt { /// <summary> /// 使用缺省密钥字符串加密 /// </summary> /// <param name="original">明文</param> /// <returns>密文</returns> public static string Encrypt(string original) { return Encrypt(original, "xyzABc*$!"); } /// <summary> /// 使用缺省密钥解密 /// </summary> /// <param name="original">密文</param> /// <returns>明文</returns> public static string Decrypt(string original) { return Decrypt(original, "xyzABc*$!", System.Text.Encoding.Default); } /// <summary> /// 使用给定密钥解密 /// </summary> /// <param name="original">密文</param> /// <param name="key">密钥</param> /// <returns>明文</returns> public static string Decrypt(string original, string key) { return Decrypt(original, key, System.Text.Encoding.Default); } /// <summary> /// 使用缺省密钥解密,返回指定编码方式明文 /// </summary> /// <param name="original">密文</param> /// <param name="encoding">编码方式</param> /// <returns>明文</returns> public static string Decrypt(string original, Encoding encoding) { return Decrypt(original, "xyzABc*$!", encoding); } /// <summary> /// 使用给定密钥加密 /// </summary> /// <param name="original">原始文字</param> /// <param name="key">密钥</param> /// <param name="encoding">字符编码方案</param> /// <returns>密文</returns> public static string Encrypt(string original, string key) { byte[] buff = System.Text.Encoding.Default.GetBytes(original); byte[] kb = System.Text.Encoding.Default.GetBytes(key); return Convert.ToBase64String(Encrypt(buff, kb)); } /// <summary> /// 使用给定密钥解密 /// </summary> /// <param name="encrypted">密文</param> /// <param name="key">密钥</param> /// <param name="encoding">字符编码方案</param> /// <returns>明文</returns> public static string Decrypt(string encrypted, string key, Encoding encoding) { byte[] buff = Convert.FromBase64String(encrypted); byte[] kb = System.Text.Encoding.Default.GetBytes(key); return encoding.GetString(Decrypt(buff, kb)); } /// <summary> /// 生成MD5摘要 /// </summary> /// <param name="original">数据源</param> /// <returns>摘要</returns> public static byte[] MakeMD5(byte[] original) { MD5CryptoServiceProvider hashmd5 = new MD5CryptoServiceProvider(); byte[] keyhash = hashmd5.ComputeHash(original); hashmd5 = null; return keyhash; } /// <summary> /// 使用给定密钥加密 /// </summary> /// <param name="original">明文</param> /// <param name="key">密钥</param> /// <returns>密文</returns> public static byte[] Encrypt(byte[] original, byte[] key) { TripleDESCryptoServiceProvider des = new TripleDESCryptoServiceProvider(); des.Key = MakeMD5(key); des.Mode = CipherMode.ECB; return des.CreateEncryptor().TransformFinalBlock(original, 0, original.Length); } /// <summary> /// 使用给定密钥解密数据 /// </summary> /// <param name="encrypted">密文</param> /// <param name="key">密钥</param> /// <returns>明文</returns> public static byte[] Decrypt(byte[] encrypted, byte[] key) { TripleDESCryptoServiceProvider des = new TripleDESCryptoServiceProvider(); des.Key = MakeMD5(key); des.Mode = CipherMode.ECB; return des.CreateDecryptor().TransformFinalBlock(encrypted, 0, encrypted.Length); } /// <summary> /// 使用给定密钥加密 /// </summary> /// <param name="original">原始数据</param> /// <param name="key">密钥</param> /// <returns>密文</returns> public static byte[] Encrypt(byte[] original) { byte[] key = System.Text.Encoding.Default.GetBytes("xyzABc*$!"); return Encrypt(original, key); } /// <summary> /// 使用缺省密钥解密数据 /// </summary> /// <param name="encrypted">密文</param> /// <param name="key">密钥</param> /// <returns>明文</returns> public static byte[] Decrypt(byte[] encrypted) { byte[] key = System.Text.Encoding.Default.GetBytes("xyzABc*$!"); return Decrypt(encrypted, key); } }

追问

你好，使用MakeMD5方式，不能解密啊？解密有异常