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125 lines
3.9 KiB
Plaintext
125 lines
3.9 KiB
Plaintext
using System;
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using System.Collections.Generic;
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using System.Linq;
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using System.Text;
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using System.IO;
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using System.Security.Cryptography;
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namespace DecryptAndEncryptionHelper
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{
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public class DecryptAndEncryptionHelper
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{
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private readonly SymmetricAlgorithm _symmetricAlgorithm;
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private const String DefKey = "qazwsxedcrfvtgb!@#$%^&*(tgbrfvedcwsxqaz)(*&^%$#@!qaz";
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private String _key = "";
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public String Key
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{
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get { return _key; }
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set
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{
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if (!String.IsNullOrEmpty(value))
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{
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_key = value;
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}
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else
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{
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_key = DefKey;
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}
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}
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}
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private const String DefIV = "tgbrfvedcwsxqaz)(*&^%$#@!qazwsxedcrfvtgb!@#$%^&*(qaz";
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private String _iv = "";
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public String IV
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{
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get { return _iv; }
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set
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{
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if (!String.IsNullOrEmpty(value))
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{
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_iv = value;
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}
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else
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{
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_iv = DefIV;
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}
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}
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}
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public DecryptAndEncryptionHelper()
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{
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_symmetricAlgorithm = new RijndaelManaged();
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}
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public DecryptAndEncryptionHelper(String Key, String IV)
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{
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_symmetricAlgorithm = new RijndaelManaged();
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_key = String.IsNullOrEmpty(Key) ? DefKey : Key;
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_iv = String.IsNullOrEmpty(IV) ? DefIV : IV;
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}
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/// <summary>
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/// Get Key
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/// </summary>
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/// <returns>密钥</returns>
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private byte[] GetLegalKey()
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{
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_symmetricAlgorithm.GenerateKey();
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byte[] bytTemp = _symmetricAlgorithm.Key;
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int KeyLength = bytTemp.Length;
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if (_key.Length > KeyLength)
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_key = _key.Substring(0, KeyLength);
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else if (_key.Length < KeyLength)
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_key = _key.PadRight(KeyLength, '#');
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return ASCIIEncoding.ASCII.GetBytes(_key);
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}
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/// <summary>
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/// Get IV
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/// </summary>
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private byte[] GetLegalIV()
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{
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_symmetricAlgorithm.GenerateIV();
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byte[] bytTemp = _symmetricAlgorithm.IV;
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int IVLength = bytTemp.Length;
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if (_iv.Length > IVLength)
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_iv = _iv.Substring(0, IVLength);
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else if (_iv.Length < IVLength)
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_iv = _iv.PadRight(IVLength, '#');
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return ASCIIEncoding.ASCII.GetBytes(_iv);
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}
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/// <summary>
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/// Encrypto 加密
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/// </summary>
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public string Encrypto(string Source)
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{
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byte[] bytIn = UTF8Encoding.UTF8.GetBytes(Source);
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MemoryStream ms = new MemoryStream();
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_symmetricAlgorithm.Key = GetLegalKey();
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_symmetricAlgorithm.IV = GetLegalIV();
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ICryptoTransform encrypto = _symmetricAlgorithm.CreateEncryptor();
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CryptoStream cs = new CryptoStream(ms, encrypto, CryptoStreamMode.Write);
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cs.Write(bytIn, 0, bytIn.Length);
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cs.FlushFinalBlock();
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ms.Close();
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byte[] bytOut = ms.ToArray();
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return Convert.ToBase64String(bytOut);
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}
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/// <summary>
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/// Decrypto 解密
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/// </summary>
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public string Decrypto(string Source)
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{
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byte[] bytIn = Convert.FromBase64String(Source);
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MemoryStream ms = new MemoryStream(bytIn, 0, bytIn.Length);
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_symmetricAlgorithm.Key = GetLegalKey();
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_symmetricAlgorithm.IV = GetLegalIV();
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ICryptoTransform encrypto = _symmetricAlgorithm.CreateDecryptor();
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CryptoStream cs = new CryptoStream(ms, encrypto, CryptoStreamMode.Read);
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StreamReader sr = new StreamReader(cs);
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return sr.ReadToEnd();
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}
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}
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}
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