You cannot select more than 25 topics Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.

125 lines
3.9 KiB
Plaintext

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