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using System;
using System.Collections.Generic;
using System.Linq;
using System.Security.Cryptography;
using System.Text;
using System.Threading.Tasks;
namespace Tango.Core.Cryptography
{
/// <summary>
/// Represents a hashing algorithm engine for one-way password encryption.
/// </summary>
/// <seealso cref="Tango.Core.Cryptography.IEncryptor" />
public class BasicHashGenerator : IHashGenerator
{
/// <summary>
/// Encrypts the specified text using the static salt key.
/// </summary>
/// <param name="text">The text.</param>
/// <returns></returns>
public string Encrypt(string text)
{
return Encrypt(text, "twine-solutions9");
}
/// <summary>
/// Encrypts the specified text using the specified salt.
/// </summary>
/// <param name="text">The text.</param>
/// <param name="salt">The key.</param>
/// <returns></returns>
public string Encrypt(string text, string salt)
{
if (salt.Length < 16)
{
salt = salt.PadRight(16);
}
salt = salt.Substring(0, 16);
byte[] saltBytes = Encoding.ASCII.GetBytes(salt);
var pbkdf2 = new Rfc2898DeriveBytes(text, saltBytes, 10000);
byte[] hash = pbkdf2.GetBytes(20);
byte[] hashBytes = new byte[36];
Array.Copy(saltBytes, 0, hashBytes, 0, 16);
Array.Copy(hash, 0, hashBytes, 16, 20);
return Convert.ToBase64String(hashBytes);
}
/// <summary>
/// Validates the specified text against the specified hash.
/// </summary>
/// <param name="text">The text.</param>
/// <param name="hash"></param>
public bool Validate(string text, string hash)
{
byte[] hashBytes = Convert.FromBase64String(hash);
byte[] salt = new byte[16];
Array.Copy(hashBytes, 0, salt, 0, 16);
var pbkdf2 = new Rfc2898DeriveBytes(text, salt, 10000);
byte[] h = pbkdf2.GetBytes(20);
for (int i = 0; i < 20; i++)
{
if (hashBytes[i + 16] != h[i])
{
return false;
}
}
return true;
}
}
}
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