-\feffusing System;
+\feff/**
+ * Novacoin classes library
+ * Copyright (C) 2015 Alex D. (balthazar.ad@gmail.com)
+
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as
+ * published by the Free Software Foundation, either version 3 of the
+ * License, or (at your option) any later version.
+
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU Affero General Public License for more details.
+
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+using System;
+using System.IO;
using System.Security.Cryptography;
namespace Novacoin
{
public class CryptoUtils
{
+ private static SHA1Managed _sha1 = new SHA1Managed();
+ private static SHA256Managed _sha256 = new SHA256Managed();
+ private static RIPEMD160Managed _ripe160 = new RIPEMD160Managed();
+
+ /// <summary>
+ /// Sha1 calculation
+ /// </summary>
+ /// <param name="inputBytes">Bytes to hash</param>
+ /// <returns>Hashing result</returns>
+ public static byte[] ComputeSha1(byte[] inputBytes)
+ {
+ return _sha1.ComputeHash(inputBytes, 0, inputBytes.Length);
+ }
+
+ /// <summary>
+ /// Sha256 calculation
+ /// </summary>
+ /// <param name="inputBytes">Bytes to hash</param>
+ /// <returns>Hashing result</returns>
+ public static byte[] ComputeSha256(byte[] inputBytes)
+ {
+ return _sha256.ComputeHash(inputBytes, 0, inputBytes.Length);
+ }
+
+ /// <summary>
+ /// RIPEMD-160 calculation
+ /// </summary>
+ /// <param name="inputBytes">Bytes to hash</param>
+ /// <returns>Hashing result</returns>
+ public static byte[] ComputeRipeMD160(byte[] inputBytes)
+ {
+ return _ripe160.ComputeHash(inputBytes, 0, inputBytes.Length);
+ }
+
+ /// <summary>
+ /// RipeMD160(Sha256(X)) calculation
+ /// </summary>
+ /// <param name="inputBytes">Bytes to hash</param>
+ /// <returns>Hashing result</returns>
+ public static byte[] ComputeHash160(byte[] inputBytes)
+ {
+ var digest1 = _sha256.ComputeHash(inputBytes, 0, inputBytes.Length);
+ return _ripe160.ComputeHash(digest1, 0, digest1.Length);
+ }
+
+ /// <summary>
+ /// Sha256(Sha256(X)) calculation
+ /// </summary>
+ /// <param name="inputBytes">Bytes to hash</param>
+ /// <returns>Hashing result</returns>
+ public static byte[] ComputeHash256(byte[] dataBytes)
+ {
+ var digest1 = _sha256.ComputeHash(dataBytes, 0, dataBytes.Length);
+ return _sha256.ComputeHash(digest1, 0, digest1.Length);
+ }
+
+ /// <summary>
+ /// Sha256(Sha256(X)) calculation
+ /// </summary>
+ /// <param name="input1">Reference to first half of data</param>
+ /// <param name="input2">Reference to second half of data</param>
+ /// <returns>Hashing result</returns>
+ public static byte[] ComputeHash256(ref byte[] input1, ref byte[] input2)
+ {
+ var buffer = new byte[64];
+
+ input1.CopyTo(buffer, 0);
+ input2.CopyTo(buffer, input1.Length);
+
+ var digest1 = _sha256.ComputeHash(buffer, 0, buffer.Length);
+ return _sha256.ComputeHash(digest1, 0, digest1.Length);
+ }
+
public static byte[] PBKDF2_Sha256(int dklen, byte[] password, byte[] salt, int iterationCount)
{
+ /* Init HMAC state. */
using (var hmac = new HMACSHA256(password))
{
int hashLength = hmac.HashSize / 8;
if ((hmac.HashSize & 7) != 0)
+ {
hashLength++;
+ }
int keyLength = dklen / hashLength;
- if ((long)dklen > (0xFFFFFFFFL * hashLength) || dklen < 0)
+ if (dklen > (0xFFFFFFFFL * hashLength) || dklen < 0)
+ {
throw new ArgumentOutOfRangeException("dklen");
+ }
if (dklen % hashLength != 0)
+ {
keyLength++;
- byte[] extendedkey = new byte[salt.Length + 4];
+ }
+ var extendedkey = new byte[salt.Length + 4];
Buffer.BlockCopy(salt, 0, extendedkey, 0, salt.Length);
- using (var ms = new System.IO.MemoryStream())
+ using (var ms = new MemoryStream())
{
+ /* Iterate through the blocks. */
for (int i = 0; i < keyLength; i++)
{
+ /* Generate INT(i + 1). */
extendedkey[salt.Length] = (byte)(((i + 1) >> 24) & 0xFF);
extendedkey[salt.Length + 1] = (byte)(((i + 1) >> 16) & 0xFF);
extendedkey[salt.Length + 2] = (byte)(((i + 1) >> 8) & 0xFF);
extendedkey[salt.Length + 3] = (byte)(((i + 1)) & 0xFF);
- byte[] u = hmac.ComputeHash(extendedkey);
+
+ /* Compute U_1 = PRF(P, S || INT(i)). */
+ var u = hmac.ComputeHash(extendedkey);
Array.Clear(extendedkey, salt.Length, 4);
- byte[] f = u;
+
+ /* T_i = U_1 ... */
+ var f = u;
for (int j = 1; j < iterationCount; j++)
{
+ /* Compute U_j. */
u = hmac.ComputeHash(u);
for (int k = 0; k < f.Length; k++)
{
+ /* ... xor U_j ... */
f[k] ^= u[k];
}
}
+
+ /* Copy as many bytes as necessary into memory stream. */
ms.Write(f, 0, f.Length);
Array.Clear(u, 0, u.Length);
Array.Clear(f, 0, f.Length);
}
- byte[] dk = new byte[dklen];
ms.Position = 0;
+
+ /* Initialize result array. */
+ var dk = new byte[dklen];
+
+ /* Read key from memory stream. */
ms.Read(dk, 0, dklen);
+
ms.Position = 0;
for (long i = 0; i < ms.Length; i++)
{
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