*/
using System;
+using System.Diagnostics.Contracts;
using System.IO;
using System.Security.Cryptography;
namespace Novacoin
{
+ /// <summary>
+ /// Hashing functionality.
+ /// </summary>
public class CryptoUtils
{
+ #region Private instances for various hashing algorithm implementations.
+ /// <summary>
+ /// Computes the SHA1 hash for the input data using the managed library.
+ /// </summary>
private static SHA1Managed _sha1 = new SHA1Managed();
+
+ /// <summary>
+ /// Computes the SHA256 hash for the input data using the managed library.
+ /// </summary>
private static SHA256Managed _sha256 = new SHA256Managed();
+
+ /// <summary>
+ /// Computes the SHA1 hash for the input data using the managed library.
+ /// </summary>
private static RIPEMD160Managed _ripe160 = new RIPEMD160Managed();
+ #endregion
/// <summary>
/// Sha1 calculation
/// <returns>Hashing result</returns>
public static byte[] ComputeHash256(ref byte[] input1, ref byte[] input2)
{
- var buffer = new byte[64];
+ var buffer = new byte[input1.Length + input2.Length];
+ // Fill the buffer
input1.CopyTo(buffer, 0);
input2.CopyTo(buffer, input1.Length);
return _sha256.ComputeHash(digest1, 0, digest1.Length);
}
+ /// <summary>
+ /// Calculate PBKDF2-SHA256(SALSA20/8(PBKDF2-SHA256(X)))
+ /// </summary>
+ /// <param name="inputBytes">Bytes to hash</param>
+ /// <returns>Hashing result</returns>
+ public static byte[] ComputeScryptHash256(byte[] inputBytes)
+ {
+ var V = new uint[(131072 + 63) / sizeof(uint)];
+
+ var keyBytes1 = PBKDF2_Sha256(128, inputBytes, inputBytes, 1);
+ var X = Interop.ToUInt32Array(keyBytes1);
+
+ for (var i = 0; i < 1024; i++)
+ {
+ Array.Copy(X, 0, V, i * 32, 32);
+
+ xor_salsa8(ref X, 0, ref X, 16);
+ xor_salsa8(ref X, 16, ref X, 0);
+ }
+ for (var i = 0; i < 1024; i++)
+ {
+ var j = 32 * (X[16] & 1023);
+ for (var k = 0; k < 32; k++)
+ {
+ X[k] ^= V[j + k];
+ }
+ xor_salsa8(ref X, 0, ref X, 16);
+ xor_salsa8(ref X, 16, ref X, 0);
+ }
+
+ var xBytes = Interop.LEBytes(X);
+
+ return PBKDF2_Sha256(32, inputBytes, xBytes, 1);
+ }
+
+
+ #region PBKDF2-SHA256
+ /// <summary>
+ /// Managed implementation of PBKDF2-SHA256.
+ /// </summary>
+ /// <param name="dklen">Key length</param>
+ /// <param name="password">Password</param>
+ /// <param name="salt">Salt</param>
+ /// <param name="iterationCount">Amount of derive iterations.</param>
+ /// <returns>Derived key</returns>
public static byte[] PBKDF2_Sha256(int dklen, byte[] password, byte[] salt, int iterationCount)
{
/* Init HMAC state. */
}
}
}
+ #endregion
+
+ #region SALSA20/8
+ private static void xor_salsa8(ref uint[] B, int indexB, ref uint[] Bx, int indexBx)
+ {
+ uint x00, x01, x02, x03, x04, x05, x06, x07, x08, x09, x10, x11, x12, x13, x14, x15;
+ byte i;
+
+ x00 = (B[indexB + 0] ^= Bx[indexBx + 0]);
+ x01 = (B[indexB + 1] ^= Bx[indexBx + 1]);
+ x02 = (B[indexB + 2] ^= Bx[indexBx + 2]);
+ x03 = (B[indexB + 3] ^= Bx[indexBx + 3]);
+ x04 = (B[indexB + 4] ^= Bx[indexBx + 4]);
+ x05 = (B[indexB + 5] ^= Bx[indexBx + 5]);
+ x06 = (B[indexB + 6] ^= Bx[indexBx + 6]);
+ x07 = (B[indexB + 7] ^= Bx[indexBx + 7]);
+ x08 = (B[indexB + 8] ^= Bx[indexBx + 8]);
+ x09 = (B[indexB + 9] ^= Bx[indexBx + 9]);
+ x10 = (B[indexB + 10] ^= Bx[indexBx + 10]);
+ x11 = (B[indexB + 11] ^= Bx[indexBx + 11]);
+ x12 = (B[indexB + 12] ^= Bx[indexBx + 12]);
+ x13 = (B[indexB + 13] ^= Bx[indexBx + 13]);
+ x14 = (B[indexB + 14] ^= Bx[indexBx + 14]);
+ x15 = (B[indexB + 15] ^= Bx[indexBx + 15]);
+
+ Func<uint, int, uint> R = (a, b) => (((a) << (b)) | ((a) >> (32 - (b))));
+
+ for (i = 0; i < 8; i += 2)
+ {
+ /* Operate on columns. */
+ x04 ^= R(x00 + x12, 7); x09 ^= R(x05 + x01, 7);
+ x14 ^= R(x10 + x06, 7); x03 ^= R(x15 + x11, 7);
+
+ x08 ^= R(x04 + x00, 9); x13 ^= R(x09 + x05, 9);
+ x02 ^= R(x14 + x10, 9); x07 ^= R(x03 + x15, 9);
+
+ x12 ^= R(x08 + x04, 13); x01 ^= R(x13 + x09, 13);
+ x06 ^= R(x02 + x14, 13); x11 ^= R(x07 + x03, 13);
+
+ x00 ^= R(x12 + x08, 18); x05 ^= R(x01 + x13, 18);
+ x10 ^= R(x06 + x02, 18); x15 ^= R(x11 + x07, 18);
+
+ /* Operate on rows. */
+ x01 ^= R(x00 + x03, 7); x06 ^= R(x05 + x04, 7);
+ x11 ^= R(x10 + x09, 7); x12 ^= R(x15 + x14, 7);
+
+ x02 ^= R(x01 + x00, 9); x07 ^= R(x06 + x05, 9);
+ x08 ^= R(x11 + x10, 9); x13 ^= R(x12 + x15, 9);
+
+ x03 ^= R(x02 + x01, 13); x04 ^= R(x07 + x06, 13);
+ x09 ^= R(x08 + x11, 13); x14 ^= R(x13 + x12, 13);
+
+ x00 ^= R(x03 + x02, 18); x05 ^= R(x04 + x07, 18);
+ x10 ^= R(x09 + x08, 18); x15 ^= R(x14 + x13, 18);
+ }
+
+ B[indexB + 0] += x00;
+ B[indexB + 1] += x01;
+ B[indexB + 2] += x02;
+ B[indexB + 3] += x03;
+ B[indexB + 4] += x04;
+ B[indexB + 5] += x05;
+ B[indexB + 6] += x06;
+ B[indexB + 7] += x07;
+ B[indexB + 8] += x08;
+ B[indexB + 9] += x09;
+ B[indexB + 10] += x10;
+ B[indexB + 11] += x11;
+ B[indexB + 12] += x12;
+ B[indexB + 13] += x13;
+ B[indexB + 14] += x14;
+ B[indexB + 15] += x15;
+ }
+ #endregion
}
}
git://git.novaco.in / NovacoinLibrary.git / blobdiff