加密解密常用函数
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本帖最后由小平于2013-6-22 10:05 编辑
#region DES加密解密
///
/// DES加密
///
/// 待加密字串
/// 32位Key值
///
public string DESEncrypt(string strSource)
{
return DESEncrypt(strSource, DESKey);
}
public string DESEncrypt(string strSource, byte[] key)
{
SymmetricAlgorithm sa = Rijndael.Create();
sa.Key = key;
sa.Mode = CipherMode.ECB;
sa.Padding = PaddingMode.Zeros;
MemoryStream ms = new MemoryStream();
CryptoStream cs = new CryptoStream(ms, sa.CreateEncryptor(), CryptoStreamMode.Write);
byte[] byt = Encoding.Unicode.GetBytes(strSource);
cs.Write(byt, 0, byt.Length);
cs.FlushFinalBlock();
cs.Close();
return Convert.ToBase64String(ms.ToArray());
}
///
/// DES解密
///
/// 待解密的字串 /// 32位Key值
///
public string DESDecrypt(string strSource)
{
return DESDecrypt(strSource, DESKey);
}
public string DESDecrypt(string strSource, byte[] key) {
SymmetricAlgorithm sa = Rijndael.Create();
sa.Key = key;
sa.Mode = CipherMode.ECB;
sa.Padding = PaddingMode.Zeros;
ICryptoTransform ct = sa.CreateDecryptor();
byte[] byt = Convert.FromBase64String(strSource);
MemoryStream ms = new MemoryStream(byt);
CryptoStream cs = new CryptoStream(ms, ct, CryptoStreamMode.Read);
StreamReader sr = new StreamReader(cs, Encoding.Unicode);
return sr.ReadToEnd();
}
#endregion
#region 一个用hash实现的加密解密方法
///
/// 加密
///
///
///
public static string EncryptStrByHash(string src)
{
if (src.Length == 0)
{
return "";
}
byte[] HaKey = System.Text.Encoding.ASCII.GetBytes((src + "Test").ToCharArray());
byte[] HaData = new byte[20];
HMACSHA1 Hmac = new HMACSHA1(HaKey);
CryptoStream cs = new CryptoStream(Stream.Null, Hmac, CryptoStreamMode.Write);
try
{
cs.Write(HaData, 0, HaData.Length);
}
finally
{
cs.Close();
}
string HaResult = System.Convert.ToBase64String(Hmac.Hash).Substring(0, 16);
byte[] RiKey = System.Text.Encoding.ASCII.GetBytes(HaResult.ToCharArray());
byte[] RiDataBuf = System.Text.Encoding.ASCII.GetBytes(src.ToCharArray());
byte[] EncodedBytes = { };
MemoryStream ms = new MemoryStream();
RijndaelManaged rv = new RijndaelManaged();
cs = new CryptoStream(ms, rv.CreateEncryptor(RiKey, RiKey),