public byte[] Protect(byte[] userData)
{
var armoredData = cryptoProvider.Encrypt(userData);
var hmacBytes = hmacProvider.GenerateHmac(armoredData);
var signedArmoredData = SecurityHelperMethods.MergeByteArrays(hmacBytes, armoredData);
return(signedArmoredData);
}
/// <summary>
/// Computes the hash.
/// </summary>
/// <param name="data">The data.</param>
/// <returns></returns>
/// <exception cref="System.ArgumentNullException">data</exception>
public byte[] ComputeHash(byte[] data)
{
if (data == null || data.Length == 0)
{
throw new ArgumentNullException(nameof(data));
}
var saltArray = SecurityHelperMethods.GenerateRandomSalt();
return(ComputeHash(data, saltArray));
}
/// <summary>
/// Generates the key.
/// </summary>
/// <param name="keySize">Size of the key.</param>
/// <returns></returns>
public static string GenerateKey(int keySize)
{
using (var rijProvider = new RijndaelManaged {
KeySize = keySize, BlockSize = 128
})
{
rijProvider.GenerateKey();
rijProvider.GenerateIV();
var key = SecurityHelperMethods.MergeByteArrays(rijProvider.Key, rijProvider.IV);
return(Convert.ToBase64String(key));
}
}
public byte[] ComputeHash(byte[] data, byte[] saltArray)
{
if (data == null)
{
throw new ArgumentNullException(nameof(data));
}
if (saltArray == null)
{
throw new ArgumentNullException(nameof(saltArray));
}
using var derivedBytes = new Rfc2898DeriveBytes(data, saltArray, iterations);
var hash = derivedBytes.GetBytes(hashSize);
var saltedHash = SecurityHelperMethods.MergeByteArrays(hash, saltArray);
return(saltedHash);
}
/// <summary>
/// Computes the hash.
/// </summary>
/// <param name="data">The data.</param>
/// <param name="saltArray">The salt array.</param>
/// <returns></returns>
/// <exception cref="System.ArgumentNullException">data</exception>
public byte[] ComputeHash(byte[] data, byte[] saltArray)
{
if (data == null || data.Length == 0)
{
throw new ArgumentNullException(nameof(data));
}
if (saltArray == null || saltArray.Length == 0)
{
throw new ArgumentNullException(nameof(saltArray));
}
using (var managedHashProvider = new SHA256Managed())
{
var saltedData = SecurityHelperMethods.MergeByteArrays(data, saltArray);
var hash = managedHashProvider.ComputeHash(saltedData);
var saltedHash = SecurityHelperMethods.MergeByteArrays(hash, saltArray);
return(saltedHash);
}
}
public bool VerifyHash(byte[] data, byte[] hash)
{
var salt = SecurityHelperMethods.ExtractRandomSalt(hashSize, hash);
return(VerifyHash(data, hash, salt));
}
public byte[] ComputeHash(byte[] data)
{
var saltArray = SecurityHelperMethods.GenerateRandomSalt();
return(ComputeHash(data, saltArray));
}
