Warren Togami
11 years ago
9 changed files with 349 additions and 56 deletions
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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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#include <openssl/sha.h> |
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static inline uint32_t 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 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 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 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 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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/* 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 unsigned char *_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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{ |
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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]; |
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uint64_t j; |
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int k; |
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size_t clen; |
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/* Compute HMAC state after processing P and S. */ |
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HMAC_SHA256_Init(&PShctx, passwd, passwdlen); |
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HMAC_SHA256_Update(&PShctx, salt, saltlen); |
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/* Iterate through the blocks. */ |
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for (i = 0; i * 32 < dkLen; i++) { |
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/* Generate INT(i + 1). */ |
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be32enc(ivec, (uint32_t)(i + 1)); |
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/* Compute U_1 = PRF(P, S || INT(i)). */ |
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memcpy(&hctx, &PShctx, sizeof(HMAC_SHA256_CTX)); |
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HMAC_SHA256_Update(&hctx, ivec, 4); |
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HMAC_SHA256_Final(U, &hctx); |
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/* T_i = U_1 ... */ |
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memcpy(T, U, 32); |
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for (j = 2; j <= c; j++) { |
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/* Compute U_j. */ |
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HMAC_SHA256_Init(&hctx, passwd, passwdlen); |
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HMAC_SHA256_Update(&hctx, U, 32); |
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HMAC_SHA256_Final(U, &hctx); |
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/* ... xor U_j ... */ |
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for (k = 0; k < 32; k++) |
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T[k] ^= U[k]; |
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} |
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/* Copy as many bytes as necessary into buf. */ |
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clen = dkLen - i * 32; |
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if (clen > 32) |
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clen = 32; |
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memcpy(&buf[i * 32], T, clen); |
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} |
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/* Clean PShctx, since we never called _Final on it. */ |
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memset(&PShctx, 0, sizeof(HMAC_SHA256_CTX)); |
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} |
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#define ROTL(a, b) (((a) << (b)) | ((a) >> (32 - (b)))) |
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static inline void xor_salsa8(uint32_t B[16], const uint32_t Bx[16]) |
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{ |
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uint32_t x00,x01,x02,x03,x04,x05,x06,x07,x08,x09,x10,x11,x12,x13,x14,x15; |
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int i; |
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x00 = (B[ 0] ^= Bx[ 0]); |
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x01 = (B[ 1] ^= Bx[ 1]); |
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x02 = (B[ 2] ^= Bx[ 2]); |
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x03 = (B[ 3] ^= Bx[ 3]); |
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x04 = (B[ 4] ^= Bx[ 4]); |
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x05 = (B[ 5] ^= Bx[ 5]); |
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x06 = (B[ 6] ^= Bx[ 6]); |
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x07 = (B[ 7] ^= Bx[ 7]); |
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x08 = (B[ 8] ^= Bx[ 8]); |
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x09 = (B[ 9] ^= Bx[ 9]); |
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x10 = (B[10] ^= Bx[10]); |
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x11 = (B[11] ^= Bx[11]); |
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x12 = (B[12] ^= Bx[12]); |
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x13 = (B[13] ^= Bx[13]); |
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x14 = (B[14] ^= Bx[14]); |
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x15 = (B[15] ^= Bx[15]); |
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for (i = 0; i < 8; i += 2) { |
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/* Operate on columns. */ |
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x04 ^= ROTL(x00 + x12, 7); x09 ^= ROTL(x05 + x01, 7); |
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x14 ^= ROTL(x10 + x06, 7); x03 ^= ROTL(x15 + x11, 7); |
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x08 ^= ROTL(x04 + x00, 9); x13 ^= ROTL(x09 + x05, 9); |
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x02 ^= ROTL(x14 + x10, 9); x07 ^= ROTL(x03 + x15, 9); |
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x12 ^= ROTL(x08 + x04, 13); x01 ^= ROTL(x13 + x09, 13); |
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x06 ^= ROTL(x02 + x14, 13); x11 ^= ROTL(x07 + x03, 13); |
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x00 ^= ROTL(x12 + x08, 18); x05 ^= ROTL(x01 + x13, 18); |
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x10 ^= ROTL(x06 + x02, 18); x15 ^= ROTL(x11 + x07, 18); |
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/* Operate on rows. */ |
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x01 ^= ROTL(x00 + x03, 7); x06 ^= ROTL(x05 + x04, 7); |
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x11 ^= ROTL(x10 + x09, 7); x12 ^= ROTL(x15 + x14, 7); |
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x02 ^= ROTL(x01 + x00, 9); x07 ^= ROTL(x06 + x05, 9); |
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x08 ^= ROTL(x11 + x10, 9); x13 ^= ROTL(x12 + x15, 9); |
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x03 ^= ROTL(x02 + x01, 13); x04 ^= ROTL(x07 + x06, 13); |
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x09 ^= ROTL(x08 + x11, 13); x14 ^= ROTL(x13 + x12, 13); |
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x00 ^= ROTL(x03 + x02, 18); x05 ^= ROTL(x04 + x07, 18); |
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x10 ^= ROTL(x09 + x08, 18); x15 ^= ROTL(x14 + x13, 18); |
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} |
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B[ 0] += x00; |
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B[ 1] += x01; |
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B[ 2] += x02; |
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B[ 3] += x03; |
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B[ 4] += x04; |
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B[ 5] += x05; |
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B[ 6] += x06; |
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B[ 7] += x07; |
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B[ 8] += x08; |
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B[ 9] += x09; |
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B[10] += x10; |
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B[11] += x11; |
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B[12] += x12; |
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B[13] += x13; |
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B[14] += x14; |
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B[15] += x15; |
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} |
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void scrypt_1024_1_1_256_sp(const char *input, char *output, char *scratchpad) |
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{ |
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uint8_t B[128]; |
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uint32_t X[32]; |
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uint32_t *V; |
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uint32_t i, j, k; |
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V = (uint32_t *)(((uintptr_t)(scratchpad) + 63) & ~ (uintptr_t)(63)); |
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PBKDF2_SHA256((const uint8_t *)input, 80, (const uint8_t *)input, 80, 1, B, 128); |
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for (k = 0; k < 32; k++) |
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X[k] = le32dec(&B[4 * k]); |
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for (i = 0; i < 1024; i++) { |
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memcpy(&V[i * 32], X, 128); |
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xor_salsa8(&X[0], &X[16]); |
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xor_salsa8(&X[16], &X[0]); |
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} |
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for (i = 0; i < 1024; i++) { |
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j = 32 * (X[16] & 1023); |
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for (k = 0; k < 32; k++) |
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X[k] ^= V[j + k]; |
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xor_salsa8(&X[0], &X[16]); |
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xor_salsa8(&X[16], &X[0]); |
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} |
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for (k = 0; k < 32; k++) |
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le32enc(&B[4 * k], X[k]); |
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PBKDF2_SHA256((const uint8_t *)input, 80, B, 128, 1, (uint8_t *)output, 32); |
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} |
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void scrypt_1024_1_1_256(const char *input, char *output) |
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{ |
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char scratchpad[SCRYPT_SCRATCHPAD_SIZE]; |
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scrypt_1024_1_1_256_sp(input, output, scratchpad); |
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} |
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@ -0,0 +1,17 @@
@@ -0,0 +1,17 @@
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#ifndef SCRYPT_H |
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#define SCRYPT_H |
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#ifdef __cplusplus |
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extern "C" { |
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#endif |
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#define SCRYPT_SCRATCHPAD_SIZE (131072 + 63) |
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void scrypt_1024_1_1_256_sp(const char *input, char *output, char *scratchpad); |
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void scrypt_1024_1_1_256(const char *input, char *output); |
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#ifdef __cplusplus |
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} |
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#endif |
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#endif |
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