/// <summary>
/// 密码解密
/// </summary>
/// <param name="pass"></param>
/// <param name="passwordFormat">枚举PasswordFormat</param>
/// <param name="salt"></param>
/// <returns></returns>
public static string UnEncodePassword(string pass, PasswordFormatOptions formatOptions, string salt)
{
switch (formatOptions)
{
case PasswordFormatOptions.Clear: // Clear:
return(pass);
case PasswordFormatOptions.Hashed: //Hashed:
throw new ArgumentException("UnEncodePassword.Hashed");
case PasswordFormatOptions.Aes:
var aes = new AESEncrypt();
return(aes.Decrypt(pass, salt));
default:
return(pass);
}
}
/// <summary>
/// 密码加密
/// </summary>
/// <param name="pass"></param>
/// <param name="passwordFormat">枚举PasswordFormat</param>
/// <param name="salt"></param>
/// <returns></returns>
public static string EncodePassword(string password, PasswordFormatOptions formatOptions, string salt)
{
if (formatOptions == PasswordFormatOptions.Clear)
{
return(password);
}
if (formatOptions == PasswordFormatOptions.Aes)
{
var aes = new AESEncrypt();
return(aes.Encrypt(password, salt));
}
var hm = GetHashAlgorithm(formatOptions);
//Hashed：不可逆，不能解密
if (formatOptions == PasswordFormatOptions.Hashed)
{
byte[] bIn = Encoding.Unicode.GetBytes(password);
byte[] bSalt = Convert.FromBase64String(salt);
byte[] bRet = null;
if (hm is KeyedHashAlgorithm)
{
KeyedHashAlgorithm kha = (KeyedHashAlgorithm)hm;
if (kha.Key.Length == bSalt.Length)
{
kha.Key = bSalt;
}
else if (kha.Key.Length < bSalt.Length)
{
byte[] bKey = new byte[kha.Key.Length];
Buffer.BlockCopy(bSalt, 0, bKey, 0, bKey.Length);
kha.Key = bKey;
}
else
{
byte[] bKey = new byte[kha.Key.Length];
for (int iter = 0; iter < bKey.Length;)
{
int len = Math.Min(bSalt.Length, bKey.Length - iter);
Buffer.BlockCopy(bSalt, 0, bKey, iter, len);
iter += len;
}
kha.Key = bKey;
}
bRet = kha.ComputeHash(bIn);
}
else
{
byte[] bAll = new byte[bSalt.Length + bIn.Length];
Buffer.BlockCopy(bSalt, 0, bAll, 0, bSalt.Length);
Buffer.BlockCopy(bIn, 0, bAll, bSalt.Length, bIn.Length);
bRet = hm.ComputeHash(bAll);
}
return(Convert.ToBase64String(bRet));
}
else
{
return(Convert.ToBase64String(hm.ComputeHash(Encoding.UTF8.GetBytes(password))));
}
}
