2 using System.Collections.Generic;
8 /// Representation of scrypt hash
10 public class ScryptHash256 : Hash
13 public override int hashSize
18 public ScryptHash256() : base() { }
19 public ScryptHash256(byte[] bytes) : base(bytes) { }
20 public ScryptHash256(IEnumerable<byte> bytes) : base(bytes) { }
23 /// Calculate scrypt hash and return new instance of ScryptHash256 class
25 /// <param name="inputBytes">Byte sequence to hash</param>
26 /// <returns>Hashing result instance</returns>
27 public static ScryptHash256 Compute256(IEnumerable<byte> inputBytes)
29 uint[] V = new uint[(131072 + 63) / sizeof(uint)];
31 byte[] dataBytes = inputBytes.ToArray();
32 byte[] keyBytes1 = CryptoUtils.PBKDF2_Sha256(128, dataBytes, dataBytes, 1);
33 uint[] X = Interop.ToUInt32Array(keyBytes1);
36 for (i = 0; i < 1024; i++)
38 Array.Copy(X, 0, V, i * 32, 32);
40 xor_salsa8(ref X, 0, ref X, 16);
41 xor_salsa8(ref X, 16, ref X, 0);
43 for (i = 0; i < 1024; i++)
45 j = 32 * (X[16] & 1023);
46 for (k = 0; k < 32; k++)
48 xor_salsa8(ref X, 0, ref X, 16);
49 xor_salsa8(ref X, 16, ref X, 0);
52 byte[] xBytes = Interop.LEBytes(X);
53 byte[] keyBytes2 = CryptoUtils.PBKDF2_Sha256(32, dataBytes, xBytes, 1);
55 return new ScryptHash256(keyBytes2);
58 private static void xor_salsa8(ref uint[] B, int indexB, ref uint[] Bx, int indexBx)
60 uint x00, x01, x02, x03, x04, x05, x06, x07, x08, x09, x10, x11, x12, x13, x14, x15;
63 x00 = (B[indexB + 0] ^= Bx[indexBx + 0]);
64 x01 = (B[indexB + 1] ^= Bx[indexBx + 1]);
65 x02 = (B[indexB + 2] ^= Bx[indexBx + 2]);
66 x03 = (B[indexB + 3] ^= Bx[indexBx + 3]);
67 x04 = (B[indexB + 4] ^= Bx[indexBx + 4]);
68 x05 = (B[indexB + 5] ^= Bx[indexBx + 5]);
69 x06 = (B[indexB + 6] ^= Bx[indexBx + 6]);
70 x07 = (B[indexB + 7] ^= Bx[indexBx + 7]);
71 x08 = (B[indexB + 8] ^= Bx[indexBx + 8]);
72 x09 = (B[indexB + 9] ^= Bx[indexBx + 9]);
73 x10 = (B[indexB + 10] ^= Bx[indexBx + 10]);
74 x11 = (B[indexB + 11] ^= Bx[indexBx + 11]);
75 x12 = (B[indexB + 12] ^= Bx[indexBx + 12]);
76 x13 = (B[indexB + 13] ^= Bx[indexBx + 13]);
77 x14 = (B[indexB + 14] ^= Bx[indexBx + 14]);
78 x15 = (B[indexB + 15] ^= Bx[indexBx + 15]);
80 Func<uint, int, uint> R = (a, b) => (((a) << (b)) | ((a) >> (32 - (b))));
82 for (i = 0; i < 8; i += 2)
84 /* Operate on columns. */
85 x04 ^= R(x00 + x12, 7); x09 ^= R(x05 + x01, 7);
86 x14 ^= R(x10 + x06, 7); x03 ^= R(x15 + x11, 7);
88 x08 ^= R(x04 + x00, 9); x13 ^= R(x09 + x05, 9);
89 x02 ^= R(x14 + x10, 9); x07 ^= R(x03 + x15, 9);
91 x12 ^= R(x08 + x04, 13); x01 ^= R(x13 + x09, 13);
92 x06 ^= R(x02 + x14, 13); x11 ^= R(x07 + x03, 13);
94 x00 ^= R(x12 + x08, 18); x05 ^= R(x01 + x13, 18);
95 x10 ^= R(x06 + x02, 18); x15 ^= R(x11 + x07, 18);
97 /* Operate on rows. */
98 x01 ^= R(x00 + x03, 7); x06 ^= R(x05 + x04, 7);
99 x11 ^= R(x10 + x09, 7); x12 ^= R(x15 + x14, 7);
101 x02 ^= R(x01 + x00, 9); x07 ^= R(x06 + x05, 9);
102 x08 ^= R(x11 + x10, 9); x13 ^= R(x12 + x15, 9);
104 x03 ^= R(x02 + x01, 13); x04 ^= R(x07 + x06, 13);
105 x09 ^= R(x08 + x11, 13); x14 ^= R(x13 + x12, 13);
107 x00 ^= R(x03 + x02, 18); x05 ^= R(x04 + x07, 18);
108 x10 ^= R(x09 + x08, 18); x15 ^= R(x14 + x13, 18);
111 B[indexB + 0] += x00;
112 B[indexB + 1] += x01;
113 B[indexB + 2] += x02;
114 B[indexB + 3] += x03;
115 B[indexB + 4] += x04;
116 B[indexB + 5] += x05;
117 B[indexB + 6] += x06;
118 B[indexB + 7] += x07;
119 B[indexB + 8] += x08;
120 B[indexB + 9] += x09;
121 B[indexB + 10] += x10;
122 B[indexB + 11] += x11;
123 B[indexB + 12] += x12;
124 B[indexB + 13] += x13;
125 B[indexB + 14] += x14;
126 B[indexB + 15] += x15;