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scrypt-1.2.1/lib/crypto/crypto_scrypt.c  view on Meta::CPAN

/*-
 * Copyright 2009 Colin Percival
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 * This file was originally written by Colin Percival as part of the Tarsnap
 * online backup system.
 */
#include "scrypt_platform.h"

#include <sys/types.h>
#include <sys/mman.h>

#include <errno.h>
#include <stdint.h>
#include <stdlib.h>
#include <string.h>

#include "cpusupport.h"
#include "sha256.h"
#include "warnp.h"

#include "crypto_scrypt_smix.h"
#include "crypto_scrypt_smix_sse2.h"

#include "crypto_scrypt.h"

static void (*smix_func)(uint8_t *, size_t, uint64_t, void *, void *) = NULL;

/**
 * _crypto_scrypt(passwd, passwdlen, salt, saltlen, N, r, p, buf, buflen, smix):
 * Perform the requested scrypt computation, using ${smix} as the smix routine.
 */
static int
_crypto_scrypt(const uint8_t * passwd, size_t passwdlen,
    const uint8_t * salt, size_t saltlen, uint64_t N, uint32_t _r, uint32_t _p,
    uint8_t * buf, size_t buflen,
    void (*smix)(uint8_t *, size_t, uint64_t, void *, void *))
{
	void * B0, * V0, * XY0;
	uint8_t * B;
	uint32_t * V;
	uint32_t * XY;
	size_t r = _r, p = _p;
	uint32_t i;

	/* Sanity-check parameters. */
#if SIZE_MAX > UINT32_MAX
	if (buflen > (((uint64_t)(1) << 32) - 1) * 32) {
		errno = EFBIG;
		goto err0;
	}
#endif
	if ((uint64_t)(r) * (uint64_t)(p) >= (1 << 30)) {
		errno = EFBIG;
		goto err0;
	}
	if (((N & (N - 1)) != 0) || (N < 2)) {
		errno = EINVAL;
		goto err0;
	}
	if ((r > SIZE_MAX / 128 / p) ||
#if SIZE_MAX / 256 <= UINT32_MAX
	    (r > (SIZE_MAX - 64) / 256) ||
#endif
	    (N > SIZE_MAX / 128 / r)) {
		errno = ENOMEM;