updated
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Matthew Little
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/*-
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* Copyright 2009 Colin Percival, 2011 ArtForz
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* This file was originally written by Colin Percival as part of the Tarsnap
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* online backup system.
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*/
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#include "scrypt.h"
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#include <stdlib.h>
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#include <stdint.h>
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#include <string.h>
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static __inline uint32_t
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be32dec(const void *pp)
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{
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const uint8_t *p = (uint8_t const *)pp;
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return ((uint32_t)(p[3]) + ((uint32_t)(p[2]) << 8) +
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((uint32_t)(p[1]) << 16) + ((uint32_t)(p[0]) << 24));
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}
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static __inline void
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be32enc(void *pp, uint32_t x)
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{
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uint8_t * p = (uint8_t *)pp;
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p[3] = x & 0xff;
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p[2] = (x >> 8) & 0xff;
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p[1] = (x >> 16) & 0xff;
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p[0] = (x >> 24) & 0xff;
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}
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static __inline uint32_t
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le32dec(const void *pp)
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{
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const uint8_t *p = (uint8_t const *)pp;
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return ((uint32_t)(p[0]) + ((uint32_t)(p[1]) << 8) +
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((uint32_t)(p[2]) << 16) + ((uint32_t)(p[3]) << 24));
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}
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static __inline void
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le32enc(void *pp, uint32_t x)
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{
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uint8_t * p = (uint8_t *)pp;
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p[0] = x & 0xff;
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p[1] = (x >> 8) & 0xff;
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p[2] = (x >> 16) & 0xff;
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p[3] = (x >> 24) & 0xff;
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}
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typedef struct SHA256Context {
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uint32_t state[8];
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uint32_t count[2];
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unsigned char buf[64];
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} SHA256_CTX;
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typedef struct HMAC_SHA256Context {
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SHA256_CTX ictx;
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SHA256_CTX octx;
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} HMAC_SHA256_CTX;
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/*
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* Encode a length len/4 vector of (uint32_t) into a length len vector of
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* (unsigned char) in big-endian form. Assumes len is a multiple of 4.
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*/
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static void
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be32enc_vect(unsigned char *dst, const uint32_t *src, size_t len)
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{
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size_t i;
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for (i = 0; i < len / 4; i++)
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be32enc(dst + i * 4, src[i]);
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}
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/*
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* Decode a big-endian length len vector of (unsigned char) into a length
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* len/4 vector of (uint32_t). Assumes len is a multiple of 4.
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*/
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static void
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be32dec_vect(uint32_t *dst, const unsigned char *src, size_t len)
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{
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size_t i;
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for (i = 0; i < len / 4; i++)
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dst[i] = be32dec(src + i * 4);
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}
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/* Elementary functions used by SHA256 */
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#define Ch(x, y, z) ((x & (y ^ z)) ^ z)
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#define Maj(x, y, z) ((x & (y | z)) | (y & z))
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#define SHR(x, n) (x >> n)
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#define ROTR(x, n) ((x >> n) | (x << (32 - n)))
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#define S0(x) (ROTR(x, 2) ^ ROTR(x, 13) ^ ROTR(x, 22))
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#define S1(x) (ROTR(x, 6) ^ ROTR(x, 11) ^ ROTR(x, 25))
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#define s0(x) (ROTR(x, 7) ^ ROTR(x, 18) ^ SHR(x, 3))
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#define s1(x) (ROTR(x, 17) ^ ROTR(x, 19) ^ SHR(x, 10))
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/* SHA256 round function */
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#define RND(a, b, c, d, e, f, g, h, k) \
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t0 = h + S1(e) + Ch(e, f, g) + k; \
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t1 = S0(a) + Maj(a, b, c); \
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d += t0; \
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h = t0 + t1;
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/* Adjusted round function for rotating state */
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#define RNDr(S, W, i, k) \
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RND(S[(64 - i) % 8], S[(65 - i) % 8], \
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S[(66 - i) % 8], S[(67 - i) % 8], \
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S[(68 - i) % 8], S[(69 - i) % 8], \
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S[(70 - i) % 8], S[(71 - i) % 8], \
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W[i] + k)
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/*
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* SHA256 block compression function. The 256-bit state is transformed via
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* the 512-bit input block to produce a new state.
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*/
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static void
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SHA256_Transform(uint32_t * state, const unsigned char block[64])
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{
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uint32_t W[64];
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uint32_t S[8];
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uint32_t t0, t1;
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int i;
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/* 1. Prepare message schedule W. */
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be32dec_vect(W, block, 64);
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for (i = 16; i < 64; i++)
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W[i] = s1(W[i - 2]) + W[i - 7] + s0(W[i - 15]) + W[i - 16];
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/* 2. Initialize working variables. */
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memcpy(S, state, 32);
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/* 3. Mix. */
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RNDr(S, W, 0, 0x428a2f98);
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RNDr(S, W, 1, 0x71374491);
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RNDr(S, W, 2, 0xb5c0fbcf);
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RNDr(S, W, 3, 0xe9b5dba5);
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RNDr(S, W, 4, 0x3956c25b);
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RNDr(S, W, 5, 0x59f111f1);
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RNDr(S, W, 6, 0x923f82a4);
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RNDr(S, W, 7, 0xab1c5ed5);
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RNDr(S, W, 8, 0xd807aa98);
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RNDr(S, W, 9, 0x12835b01);
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RNDr(S, W, 10, 0x243185be);
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RNDr(S, W, 11, 0x550c7dc3);
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RNDr(S, W, 12, 0x72be5d74);
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RNDr(S, W, 13, 0x80deb1fe);
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RNDr(S, W, 14, 0x9bdc06a7);
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RNDr(S, W, 15, 0xc19bf174);
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RNDr(S, W, 16, 0xe49b69c1);
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RNDr(S, W, 17, 0xefbe4786);
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RNDr(S, W, 18, 0x0fc19dc6);
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RNDr(S, W, 19, 0x240ca1cc);
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RNDr(S, W, 20, 0x2de92c6f);
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RNDr(S, W, 21, 0x4a7484aa);
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RNDr(S, W, 22, 0x5cb0a9dc);
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RNDr(S, W, 23, 0x76f988da);
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RNDr(S, W, 24, 0x983e5152);
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RNDr(S, W, 25, 0xa831c66d);
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RNDr(S, W, 26, 0xb00327c8);
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RNDr(S, W, 27, 0xbf597fc7);
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RNDr(S, W, 28, 0xc6e00bf3);
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RNDr(S, W, 29, 0xd5a79147);
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RNDr(S, W, 30, 0x06ca6351);
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RNDr(S, W, 31, 0x14292967);
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RNDr(S, W, 32, 0x27b70a85);
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RNDr(S, W, 33, 0x2e1b2138);
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RNDr(S, W, 34, 0x4d2c6dfc);
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RNDr(S, W, 35, 0x53380d13);
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RNDr(S, W, 36, 0x650a7354);
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RNDr(S, W, 37, 0x766a0abb);
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RNDr(S, W, 38, 0x81c2c92e);
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RNDr(S, W, 39, 0x92722c85);
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RNDr(S, W, 40, 0xa2bfe8a1);
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RNDr(S, W, 41, 0xa81a664b);
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RNDr(S, W, 42, 0xc24b8b70);
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RNDr(S, W, 43, 0xc76c51a3);
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RNDr(S, W, 44, 0xd192e819);
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RNDr(S, W, 45, 0xd6990624);
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RNDr(S, W, 46, 0xf40e3585);
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RNDr(S, W, 47, 0x106aa070);
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RNDr(S, W, 48, 0x19a4c116);
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RNDr(S, W, 49, 0x1e376c08);
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RNDr(S, W, 50, 0x2748774c);
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RNDr(S, W, 51, 0x34b0bcb5);
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RNDr(S, W, 52, 0x391c0cb3);
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RNDr(S, W, 53, 0x4ed8aa4a);
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RNDr(S, W, 54, 0x5b9cca4f);
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RNDr(S, W, 55, 0x682e6ff3);
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RNDr(S, W, 56, 0x748f82ee);
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RNDr(S, W, 57, 0x78a5636f);
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RNDr(S, W, 58, 0x84c87814);
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RNDr(S, W, 59, 0x8cc70208);
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RNDr(S, W, 60, 0x90befffa);
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RNDr(S, W, 61, 0xa4506ceb);
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RNDr(S, W, 62, 0xbef9a3f7);
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RNDr(S, W, 63, 0xc67178f2);
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/* 4. Mix local working variables into global state */
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for (i = 0; i < 8; i++)
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state[i] += S[i];
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/* Clean the stack. */
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memset(W, 0, 256);
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memset(S, 0, 32);
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t0 = t1 = 0;
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}
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static unsigned char PAD[64] = {
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0x80, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
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};
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/* SHA-256 initialization. Begins a SHA-256 operation. */
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static void
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SHA256_Init(SHA256_CTX * ctx)
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{
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/* Zero bits processed so far */
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ctx->count[0] = ctx->count[1] = 0;
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/* Magic initialization constants */
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ctx->state[0] = 0x6A09E667;
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ctx->state[1] = 0xBB67AE85;
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ctx->state[2] = 0x3C6EF372;
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ctx->state[3] = 0xA54FF53A;
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ctx->state[4] = 0x510E527F;
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ctx->state[5] = 0x9B05688C;
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ctx->state[6] = 0x1F83D9AB;
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ctx->state[7] = 0x5BE0CD19;
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}
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/* Add bytes into the hash */
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static void
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SHA256_Update(SHA256_CTX * ctx, const void *in, size_t len)
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{
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uint32_t bitlen[2];
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uint32_t r;
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const unsigned char *src = in;
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/* Number of bytes left in the buffer from previous updates */
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r = (ctx->count[1] >> 3) & 0x3f;
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/* Convert the length into a number of bits */
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bitlen[1] = ((uint32_t)len) << 3;
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bitlen[0] = (uint32_t)(len >> 29);
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/* Update number of bits */
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if ((ctx->count[1] += bitlen[1]) < bitlen[1])
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ctx->count[0]++;
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ctx->count[0] += bitlen[0];
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/* Handle the case where we don't need to perform any transforms */
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if (len < 64 - r) {
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memcpy(&ctx->buf[r], src, len);
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return;
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}
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/* Finish the current block */
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memcpy(&ctx->buf[r], src, 64 - r);
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SHA256_Transform(ctx->state, ctx->buf);
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src += 64 - r;
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len -= 64 - r;
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/* Perform complete blocks */
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while (len >= 64) {
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SHA256_Transform(ctx->state, src);
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src += 64;
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len -= 64;
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}
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/* Copy left over data into buffer */
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memcpy(ctx->buf, src, len);
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}
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/* Add padding and terminating bit-count. */
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static void
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SHA256_Pad(SHA256_CTX * ctx)
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{
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unsigned char len[8];
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uint32_t r, plen;
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/*
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* Convert length to a vector of bytes -- we do this now rather
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* than later because the length will change after we pad.
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*/
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be32enc_vect(len, ctx->count, 8);
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/* Add 1--64 bytes so that the resulting length is 56 mod 64 */
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r = (ctx->count[1] >> 3) & 0x3f;
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plen = (r < 56) ? (56 - r) : (120 - r);
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SHA256_Update(ctx, PAD, (size_t)plen);
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/* Add the terminating bit-count */
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SHA256_Update(ctx, len, 8);
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}
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/*
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* SHA-256 finalization. Pads the input data, exports the hash value,
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* and clears the context state.
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*/
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static void
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SHA256_Final(unsigned char digest[32], SHA256_CTX * ctx)
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{
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/* Add padding */
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SHA256_Pad(ctx);
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/* Write the hash */
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be32enc_vect(digest, ctx->state, 32);
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/* Clear the context state */
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memset((void *)ctx, 0, sizeof(*ctx));
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}
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/* Initialize an HMAC-SHA256 operation with the given key. */
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static void
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HMAC_SHA256_Init(HMAC_SHA256_CTX * ctx, const void * _K, size_t Klen)
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{
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unsigned char pad[64];
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unsigned char khash[32];
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const unsigned char * K = _K;
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size_t i;
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/* If Klen > 64, the key is really SHA256(K). */
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if (Klen > 64) {
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SHA256_Init(&ctx->ictx);
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SHA256_Update(&ctx->ictx, K, Klen);
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SHA256_Final(khash, &ctx->ictx);
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K = khash;
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Klen = 32;
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}
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/* Inner SHA256 operation is SHA256(K xor [block of 0x36] || data). */
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SHA256_Init(&ctx->ictx);
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memset(pad, 0x36, 64);
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for (i = 0; i < Klen; i++)
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pad[i] ^= K[i];
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SHA256_Update(&ctx->ictx, pad, 64);
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/* Outer SHA256 operation is SHA256(K xor [block of 0x5c] || hash). */
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SHA256_Init(&ctx->octx);
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memset(pad, 0x5c, 64);
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for (i = 0; i < Klen; i++)
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pad[i] ^= K[i];
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SHA256_Update(&ctx->octx, pad, 64);
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/* Clean the stack. */
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memset(khash, 0, 32);
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}
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/* Add bytes to the HMAC-SHA256 operation. */
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static void
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HMAC_SHA256_Update(HMAC_SHA256_CTX * ctx, const void *in, size_t len)
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{
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/* Feed data to the inner SHA256 operation. */
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SHA256_Update(&ctx->ictx, in, len);
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}
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/* Finish an HMAC-SHA256 operation. */
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static void
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HMAC_SHA256_Final(unsigned char digest[32], HMAC_SHA256_CTX * ctx)
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{
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unsigned char ihash[32];
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/* Finish the inner SHA256 operation. */
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SHA256_Final(ihash, &ctx->ictx);
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/* Feed the inner hash to the outer SHA256 operation. */
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SHA256_Update(&ctx->octx, ihash, 32);
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/* Finish the outer SHA256 operation. */
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SHA256_Final(digest, &ctx->octx);
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/* Clean the stack. */
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memset(ihash, 0, 32);
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}
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/**
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* PBKDF2_SHA256(passwd, passwdlen, salt, saltlen, c, buf, dkLen):
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* Compute PBKDF2(passwd, salt, c, dkLen) using HMAC-SHA256 as the PRF, and
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* write the output to buf. The value dkLen must be at most 32 * (2^32 - 1).
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*/
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static void
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PBKDF2_SHA256(const uint8_t * passwd, size_t passwdlen, const uint8_t * salt,
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size_t saltlen, uint64_t c, uint8_t * buf, size_t dkLen)
|
||||
{
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||||
HMAC_SHA256_CTX PShctx, hctx;
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||||
size_t i;
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||||
uint8_t ivec[4];
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uint8_t U[32];
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uint8_t T[32];
|
||||
uint64_t j;
|
||||
int k;
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||||
size_t clen;
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||||
|
||||
/* Compute HMAC state after processing P and S. */
|
||||
HMAC_SHA256_Init(&PShctx, passwd, passwdlen);
|
||||
HMAC_SHA256_Update(&PShctx, salt, saltlen);
|
||||
|
||||
/* Iterate through the blocks. */
|
||||
for (i = 0; i * 32 < dkLen; i++) {
|
||||
/* Generate INT(i + 1). */
|
||||
be32enc(ivec, (uint32_t)(i + 1));
|
||||
|
||||
/* Compute U_1 = PRF(P, S || INT(i)). */
|
||||
memcpy(&hctx, &PShctx, sizeof(HMAC_SHA256_CTX));
|
||||
HMAC_SHA256_Update(&hctx, ivec, 4);
|
||||
HMAC_SHA256_Final(U, &hctx);
|
||||
|
||||
/* T_i = U_1 ... */
|
||||
memcpy(T, U, 32);
|
||||
|
||||
for (j = 2; j <= c; j++) {
|
||||
/* Compute U_j. */
|
||||
HMAC_SHA256_Init(&hctx, passwd, passwdlen);
|
||||
HMAC_SHA256_Update(&hctx, U, 32);
|
||||
HMAC_SHA256_Final(U, &hctx);
|
||||
|
||||
/* ... xor U_j ... */
|
||||
for (k = 0; k < 32; k++)
|
||||
T[k] ^= U[k];
|
||||
}
|
||||
|
||||
/* Copy as many bytes as necessary into buf. */
|
||||
clen = dkLen - i * 32;
|
||||
if (clen > 32)
|
||||
clen = 32;
|
||||
memcpy(&buf[i * 32], T, clen);
|
||||
}
|
||||
|
||||
/* Clean PShctx, since we never called _Final on it. */
|
||||
memset(&PShctx, 0, sizeof(HMAC_SHA256_CTX));
|
||||
}
|
||||
|
||||
|
||||
static void blkcpy(void *, void *, size_t);
|
||||
static void blkxor(void *, void *, size_t);
|
||||
static void salsa20_8(uint32_t[16]);
|
||||
static void blockmix_salsa8(uint32_t *, uint32_t *, uint32_t *, size_t);
|
||||
static uint64_t integerify(void *, size_t);
|
||||
static void smix(uint8_t *, size_t, uint64_t, uint32_t *, uint32_t *);
|
||||
|
||||
static void
|
||||
blkcpy(void * dest, void * src, size_t len)
|
||||
{
|
||||
size_t * D = dest;
|
||||
size_t * S = src;
|
||||
size_t L = len / sizeof(size_t);
|
||||
size_t i;
|
||||
|
||||
for (i = 0; i < L; i++)
|
||||
D[i] = S[i];
|
||||
}
|
||||
|
||||
static void
|
||||
blkxor(void * dest, void * src, size_t len)
|
||||
{
|
||||
size_t * D = dest;
|
||||
size_t * S = src;
|
||||
size_t L = len / sizeof(size_t);
|
||||
size_t i;
|
||||
|
||||
for (i = 0; i < L; i++)
|
||||
D[i] ^= S[i];
|
||||
}
|
||||
|
||||
/**
|
||||
* salsa20_8(B):
|
||||
* Apply the salsa20/8 core to the provided block.
|
||||
*/
|
||||
static void
|
||||
salsa20_8(uint32_t B[16])
|
||||
{
|
||||
uint32_t x[16];
|
||||
size_t i;
|
||||
|
||||
blkcpy(x, B, 64);
|
||||
for (i = 0; i < 8; i += 2) {
|
||||
#define R(a,b) (((a) << (b)) | ((a) >> (32 - (b))))
|
||||
/* Operate on columns. */
|
||||
x[ 4] ^= R(x[ 0]+x[12], 7); x[ 8] ^= R(x[ 4]+x[ 0], 9);
|
||||
x[12] ^= R(x[ 8]+x[ 4],13); x[ 0] ^= R(x[12]+x[ 8],18);
|
||||
|
||||
x[ 9] ^= R(x[ 5]+x[ 1], 7); x[13] ^= R(x[ 9]+x[ 5], 9);
|
||||
x[ 1] ^= R(x[13]+x[ 9],13); x[ 5] ^= R(x[ 1]+x[13],18);
|
||||
|
||||
x[14] ^= R(x[10]+x[ 6], 7); x[ 2] ^= R(x[14]+x[10], 9);
|
||||
x[ 6] ^= R(x[ 2]+x[14],13); x[10] ^= R(x[ 6]+x[ 2],18);
|
||||
|
||||
x[ 3] ^= R(x[15]+x[11], 7); x[ 7] ^= R(x[ 3]+x[15], 9);
|
||||
x[11] ^= R(x[ 7]+x[ 3],13); x[15] ^= R(x[11]+x[ 7],18);
|
||||
|
||||
/* Operate on rows. */
|
||||
x[ 1] ^= R(x[ 0]+x[ 3], 7); x[ 2] ^= R(x[ 1]+x[ 0], 9);
|
||||
x[ 3] ^= R(x[ 2]+x[ 1],13); x[ 0] ^= R(x[ 3]+x[ 2],18);
|
||||
|
||||
x[ 6] ^= R(x[ 5]+x[ 4], 7); x[ 7] ^= R(x[ 6]+x[ 5], 9);
|
||||
x[ 4] ^= R(x[ 7]+x[ 6],13); x[ 5] ^= R(x[ 4]+x[ 7],18);
|
||||
|
||||
x[11] ^= R(x[10]+x[ 9], 7); x[ 8] ^= R(x[11]+x[10], 9);
|
||||
x[ 9] ^= R(x[ 8]+x[11],13); x[10] ^= R(x[ 9]+x[ 8],18);
|
||||
|
||||
x[12] ^= R(x[15]+x[14], 7); x[13] ^= R(x[12]+x[15], 9);
|
||||
x[14] ^= R(x[13]+x[12],13); x[15] ^= R(x[14]+x[13],18);
|
||||
#undef R
|
||||
}
|
||||
for (i = 0; i < 16; i++)
|
||||
B[i] += x[i];
|
||||
}
|
||||
|
||||
/**
|
||||
* blockmix_salsa8(Bin, Bout, X, r):
|
||||
* Compute Bout = BlockMix_{salsa20/8, r}(Bin). The input Bin must be 128r
|
||||
* bytes in length; the output Bout must also be the same size. The
|
||||
* temporary space X must be 64 bytes.
|
||||
*/
|
||||
static void
|
||||
blockmix_salsa8(uint32_t * Bin, uint32_t * Bout, uint32_t * X, size_t r)
|
||||
{
|
||||
size_t i;
|
||||
|
||||
/* 1: X <-- B_{2r - 1} */
|
||||
blkcpy(X, &Bin[(2 * r - 1) * 16], 64);
|
||||
|
||||
/* 2: for i = 0 to 2r - 1 do */
|
||||
for (i = 0; i < 2 * r; i += 2) {
|
||||
/* 3: X <-- H(X \xor B_i) */
|
||||
blkxor(X, &Bin[i * 16], 64);
|
||||
salsa20_8(X);
|
||||
|
||||
/* 4: Y_i <-- X */
|
||||
/* 6: B' <-- (Y_0, Y_2 ... Y_{2r-2}, Y_1, Y_3 ... Y_{2r-1}) */
|
||||
blkcpy(&Bout[i * 8], X, 64);
|
||||
|
||||
/* 3: X <-- H(X \xor B_i) */
|
||||
blkxor(X, &Bin[i * 16 + 16], 64);
|
||||
salsa20_8(X);
|
||||
|
||||
/* 4: Y_i <-- X */
|
||||
/* 6: B' <-- (Y_0, Y_2 ... Y_{2r-2}, Y_1, Y_3 ... Y_{2r-1}) */
|
||||
blkcpy(&Bout[i * 8 + r * 16], X, 64);
|
||||
}
|
||||
}
|
||||
|
||||
/**
|
||||
* integerify(B, r):
|
||||
* Return the result of parsing B_{2r-1} as a little-endian integer.
|
||||
*/
|
||||
static uint64_t
|
||||
integerify(void * B, size_t r)
|
||||
{
|
||||
uint32_t * X = (void *)((uintptr_t)(B) + (2 * r - 1) * 64);
|
||||
|
||||
return (((uint64_t)(X[1]) << 32) + X[0]);
|
||||
}
|
||||
|
||||
/**
|
||||
* smix(B, r, N, V, XY):
|
||||
* Compute B = SMix_r(B, N). The input B must be 128r bytes in length;
|
||||
* the temporary storage V must be 128rN bytes in length; the temporary
|
||||
* storage XY must be 256r + 64 bytes in length. The value N must be a
|
||||
* power of 2 greater than 1. The arrays B, V, and XY must be aligned to a
|
||||
* multiple of 64 bytes.
|
||||
*/
|
||||
static void
|
||||
smix(uint8_t * B, size_t r, uint64_t N, uint32_t * V, uint32_t * XY)
|
||||
{
|
||||
uint32_t * X = XY;
|
||||
uint32_t * Y = &XY[32 * r];
|
||||
uint32_t * Z = &XY[64 * r];
|
||||
uint64_t i;
|
||||
uint64_t j;
|
||||
size_t k;
|
||||
|
||||
/* 1: X <-- B */
|
||||
for (k = 0; k < 32 * r; k++)
|
||||
X[k] = le32dec(&B[4 * k]);
|
||||
|
||||
/* 2: for i = 0 to N - 1 do */
|
||||
for (i = 0; i < N; i += 2) {
|
||||
/* 3: V_i <-- X */
|
||||
blkcpy(&V[i * (32 * r)], X, 128 * r);
|
||||
|
||||
/* 4: X <-- H(X) */
|
||||
blockmix_salsa8(X, Y, Z, r);
|
||||
|
||||
/* 3: V_i <-- X */
|
||||
blkcpy(&V[(i + 1) * (32 * r)], Y, 128 * r);
|
||||
|
||||
/* 4: X <-- H(X) */
|
||||
blockmix_salsa8(Y, X, Z, r);
|
||||
}
|
||||
|
||||
/* 6: for i = 0 to N - 1 do */
|
||||
for (i = 0; i < N; i += 2) {
|
||||
/* 7: j <-- Integerify(X) mod N */
|
||||
j = integerify(X, r) & (N - 1);
|
||||
|
||||
/* 8: X <-- H(X \xor V_j) */
|
||||
blkxor(X, &V[j * (32 * r)], 128 * r);
|
||||
blockmix_salsa8(X, Y, Z, r);
|
||||
|
||||
/* 7: j <-- Integerify(X) mod N */
|
||||
j = integerify(Y, r) & (N - 1);
|
||||
|
||||
/* 8: X <-- H(X \xor V_j) */
|
||||
blkxor(Y, &V[j * (32 * r)], 128 * r);
|
||||
blockmix_salsa8(Y, X, Z, r);
|
||||
}
|
||||
|
||||
/* 10: B' <-- X */
|
||||
for (k = 0; k < 32 * r; k++)
|
||||
le32enc(&B[4 * k], X[k]);
|
||||
}
|
||||
|
||||
/* cpu and memory intensive function to transform a 80 byte buffer into a 32 byte output
|
||||
scratchpad size needs to be at least 63 + (128 * r * p) + (256 * r + 64) + (128 * r * N) bytes
|
||||
*/
|
||||
void scrypt_1024_1_1_256_sp(const char* input, char* output, char* scratchpad)
|
||||
{
|
||||
uint8_t * B;
|
||||
uint32_t * V;
|
||||
uint32_t * XY;
|
||||
uint32_t i;
|
||||
|
||||
const uint32_t N = 1024;
|
||||
const uint32_t r = 1;
|
||||
const uint32_t p = 1;
|
||||
|
||||
B = (uint8_t *)(((uintptr_t)(scratchpad) + 63) & ~ (uintptr_t)(63));
|
||||
XY = (uint32_t *)(B + (128 * r * p));
|
||||
V = (uint32_t *)(B + (128 * r * p) + (256 * r + 64));
|
||||
|
||||
/* 1: (B_0 ... B_{p-1}) <-- PBKDF2(P, S, 1, p * MFLen) */
|
||||
PBKDF2_SHA256((const uint8_t*)input, 80, (const uint8_t*)input, 80, 1, B, p * 128 * r);
|
||||
|
||||
/* 2: for i = 0 to p - 1 do */
|
||||
for (i = 0; i < p; i++) {
|
||||
/* 3: B_i <-- MF(B_i, N) */
|
||||
smix(&B[i * 128 * r], r, N, V, XY);
|
||||
}
|
||||
|
||||
/* 5: DK <-- PBKDF2(P, B, 1, dkLen) */
|
||||
PBKDF2_SHA256((const uint8_t*)input, 80, B, p * 128 * r, 1, (uint8_t*)output, 32);
|
||||
}
|
||||
|
||||
void scrypt_1024_1_1_256(const char* input, char* output)
|
||||
{
|
||||
char scratchpad[131583];
|
||||
scrypt_1024_1_1_256_sp(input, output, scratchpad);
|
||||
}
|
||||
|
||||
@ -1,16 +0,0 @@
|
||||
#ifndef SCRYPT_H
|
||||
#define SCRYPT_H
|
||||
|
||||
#ifdef __cplusplus
|
||||
extern "C" {
|
||||
#endif
|
||||
|
||||
void scrypt_1024_1_1_256(const char* input, char* output);
|
||||
void scrypt_1024_1_1_256_sp(const char* input, char* output, char* scratchpad);
|
||||
#define scrypt_scratchpad_size 131583;
|
||||
|
||||
#ifdef __cplusplus
|
||||
}
|
||||
#endif
|
||||
|
||||
#endif
|
||||
@ -1,57 +0,0 @@
|
||||
#include <Python.h>
|
||||
|
||||
#include "scrypt.h"
|
||||
|
||||
static PyObject *scrypt_getpowhash(PyObject *self, PyObject *args)
|
||||
{
|
||||
char *output;
|
||||
PyObject *value;
|
||||
#if PY_MAJOR_VERSION >= 3
|
||||
PyBytesObject *input;
|
||||
#else
|
||||
PyStringObject *input;
|
||||
#endif
|
||||
if (!PyArg_ParseTuple(args, "S", &input))
|
||||
return NULL;
|
||||
Py_INCREF(input);
|
||||
output = PyMem_Malloc(32);
|
||||
|
||||
#if PY_MAJOR_VERSION >= 3
|
||||
scrypt_1024_1_1_256((char *)PyBytes_AsString((PyObject*) input), output);
|
||||
#else
|
||||
scrypt_1024_1_1_256((char *)PyString_AsString((PyObject*) input), output);
|
||||
#endif
|
||||
Py_DECREF(input);
|
||||
#if PY_MAJOR_VERSION >= 3
|
||||
value = Py_BuildValue("y#", output, 32);
|
||||
#else
|
||||
value = Py_BuildValue("s#", output, 32);
|
||||
#endif
|
||||
PyMem_Free(output);
|
||||
return value;
|
||||
}
|
||||
|
||||
static PyMethodDef ScryptMethods[] = {
|
||||
{ "getPoWHash", scrypt_getpowhash, METH_VARARGS, "Returns the proof of work hash using scrypt" },
|
||||
{ NULL, NULL, 0, NULL }
|
||||
};
|
||||
|
||||
#if PY_MAJOR_VERSION >= 3
|
||||
static struct PyModuleDef ScryptModule = {
|
||||
PyModuleDef_HEAD_INIT,
|
||||
"ltc_scrypt",
|
||||
"...",
|
||||
-1,
|
||||
ScryptMethods
|
||||
};
|
||||
|
||||
PyMODINIT_FUNC PyInit_ltc_scrypt(void) {
|
||||
return PyModule_Create(&ScryptModule);
|
||||
}
|
||||
|
||||
#else
|
||||
|
||||
PyMODINIT_FUNC initltc_scrypt(void) {
|
||||
(void) Py_InitModule("ltc_scrypt", ScryptMethods);
|
||||
}
|
||||
#endif
|
||||
@ -1,11 +0,0 @@
|
||||
from distutils.core import setup, Extension
|
||||
|
||||
ltc_scrypt_module = Extension('ltc_scrypt',
|
||||
sources = ['scryptmodule.c',
|
||||
'scrypt.c'],
|
||||
include_dirs=['.'])
|
||||
|
||||
setup (name = 'ltc_scrypt',
|
||||
version = '1.0',
|
||||
description = 'Bindings for scrypt proof of work used by Litecoin',
|
||||
ext_modules = [ltc_scrypt_module])
|
||||
177
python/util.py
177
python/util.py
@ -1,177 +0,0 @@
|
||||
import binascii
|
||||
import struct
|
||||
from hashlib import sha256
|
||||
import ltc_scrypt
|
||||
|
||||
def ser_number(n):
|
||||
# For encoding nHeight into coinbase
|
||||
s = bytearray(b'\1')
|
||||
while n > 127:
|
||||
s[0] += 1
|
||||
s.append(n % 256)
|
||||
n //= 256
|
||||
s.append(n)
|
||||
return bytes(s)
|
||||
|
||||
|
||||
|
||||
def ser_string(s):
|
||||
if len(s) < 253:
|
||||
return chr(len(s)) + s
|
||||
elif len(s) < 0x10000:
|
||||
print "here"
|
||||
return chr(253) + struct.pack("<H", len(s)) + s
|
||||
elif len(s) < 0x100000000L:
|
||||
return chr(254) + struct.pack("<I", len(s)) + s
|
||||
else:
|
||||
return chr(255) + struct.pack("<Q", len(s)) + s
|
||||
|
||||
|
||||
|
||||
def doublesha(b):
|
||||
return sha256(sha256(b).digest()).digest()
|
||||
|
||||
__b58chars = '123456789ABCDEFGHJKLMNPQRSTUVWXYZabcdefghijkmnopqrstuvwxyz'
|
||||
__b58base = len(__b58chars)
|
||||
|
||||
def b58decode(v, length):
|
||||
""" decode v into a string of len bytes
|
||||
"""
|
||||
long_value = 0L
|
||||
for (i, c) in enumerate(v[::-1]):
|
||||
long_value += __b58chars.find(c) * (__b58base**i)
|
||||
|
||||
result = ''
|
||||
while long_value >= 256:
|
||||
div, mod = divmod(long_value, 256)
|
||||
result = chr(mod) + result
|
||||
long_value = div
|
||||
result = chr(long_value) + result
|
||||
|
||||
nPad = 0
|
||||
for c in v:
|
||||
if c == __b58chars[0]: nPad += 1
|
||||
else: break
|
||||
|
||||
result = chr(0)*nPad + result
|
||||
if length is not None and len(result) != length:
|
||||
return None
|
||||
|
||||
return result
|
||||
|
||||
def address_to_pubkeyhash(addr):
|
||||
#try:
|
||||
addr = b58decode(addr, 25)
|
||||
#except:
|
||||
# return None
|
||||
|
||||
if addr is None:
|
||||
return None
|
||||
|
||||
ver = addr[0]
|
||||
cksumA = addr[-4:]
|
||||
cksumB = doublesha(addr[:-4])[:4]
|
||||
|
||||
if cksumA != cksumB:
|
||||
return None
|
||||
|
||||
return (ver, addr[1:-4])
|
||||
|
||||
def script_to_address(addr):
|
||||
d = address_to_pubkeyhash(addr)
|
||||
if not d:
|
||||
raise ValueError('invalid address')
|
||||
(ver, pubkeyhash) = d
|
||||
print "a - " + binascii.hexlify(pubkeyhash)
|
||||
return b'\x76\xa9\x14' + pubkeyhash + b'\x88\xac'
|
||||
|
||||
|
||||
def ser_uint256(u):
|
||||
rs = ""
|
||||
for i in xrange(8):
|
||||
rs += struct.pack("<I", u & 0xFFFFFFFFL)
|
||||
u >>= 32
|
||||
return rs
|
||||
|
||||
def uint256_from_str(s):
|
||||
r = 0L
|
||||
t = struct.unpack("<IIIIIIII", s[:32])
|
||||
for i in xrange(8):
|
||||
r += t[i] << (i * 32)
|
||||
return r
|
||||
|
||||
def ser_uint256_be(u):
|
||||
'''ser_uint256 to big endian'''
|
||||
rs = ""
|
||||
for i in xrange(8):
|
||||
rs += struct.pack(">I", u & 0xFFFFFFFFL)
|
||||
u >>= 32
|
||||
return rs
|
||||
|
||||
def reverse_hash(h):
|
||||
# This only revert byte order, nothing more
|
||||
if len(h) != 64:
|
||||
raise Exception('hash must have 64 hexa chars')
|
||||
|
||||
return ''.join([ h[56-i:64-i] for i in range(0, 64, 8) ])
|
||||
|
||||
def serialize_header(merkle_root_int, ntime_bin, nonce_bin, nVersion, nBits, prevhash_bin):
|
||||
'''Serialize header for calculating block hash'''
|
||||
r = struct.pack(">i", nVersion)
|
||||
r += prevhash_bin
|
||||
r += ser_uint256_be(merkle_root_int)
|
||||
r += ntime_bin
|
||||
r += struct.pack(">I", nBits)
|
||||
r += nonce_bin
|
||||
return r
|
||||
|
||||
|
||||
def diff_to_target(difficulty):
|
||||
diff1 = 0x0000ffff00000000000000000000000000000000000000000000000000000000
|
||||
return diff1 / difficulty
|
||||
|
||||
|
||||
|
||||
nonce = "cf280000"
|
||||
nonce_bin = binascii.unhexlify(nonce)
|
||||
|
||||
bits = "1c013403"
|
||||
nBits = int(bits, 16)
|
||||
|
||||
ntime = "52ce31b9"
|
||||
ntime_bin = binascii.unhexlify(ntime)
|
||||
|
||||
merkleroot = "38f3e68be0b74813af175b8da506dfa3c3017ff06fed7ae85e3efee655c9f7fd"
|
||||
|
||||
merkle_root_bin = binascii.unhexlify(merkleroot)
|
||||
merkle_root_int = uint256_from_str(merkle_root_bin)
|
||||
|
||||
|
||||
pbh = "fefbf5b855440b6ac8f742e03558a910969a8232cc0436c59c306e1d493ca917"
|
||||
prevhash_bin = binascii.unhexlify(reverse_hash(pbh))
|
||||
|
||||
version = 1
|
||||
|
||||
|
||||
|
||||
header_bin = serialize_header(merkle_root_int, ntime_bin, nonce_bin, version, nBits, prevhash_bin)
|
||||
hash_bin = ''.join([ header_bin[i*4:i*4+4][::-1] for i in range(0, 20) ])
|
||||
hash_bin = ltc_scrypt.getPoWHash(hash_bin)
|
||||
hash_int = uint256_from_str(hash_bin)
|
||||
|
||||
target_user = diff_to_target(16)
|
||||
|
||||
print hash_int
|
||||
print target_user
|
||||
|
||||
if hash_int > target_user:
|
||||
print 'bad'
|
||||
else:
|
||||
print 'good'
|
||||
|
||||
|
||||
|
||||
for x in range(0, 10):
|
||||
source = binascii.unhexlify("38f3e68be0b74813af175b8da506dfa3c3017ff06fed7ae85e3efee655c9f7fd");
|
||||
print binascii.hexlify(source)
|
||||
print "hash " + str(x) + " " + binascii.hexlify(ltc_scrypt.getPoWHash(source))
|
||||
Loading…
Reference in New Issue
Block a user