freebsd-dev/sys/geom/eli/pkcs5v2.c
Pedro F. Giffuni 3728855a0f sys/geom: adoption of SPDX licensing ID tags.
Mainly focus on files that use BSD 2-Clause license, however the tool I
was using misidentified many licenses so this was mostly a manual - error
prone - task.

The Software Package Data Exchange (SPDX) group provides a specification
to make it easier for automated tools to detect and summarize well known
opensource licenses. We are gradually adopting the specification, noting
that the tags are considered only advisory and do not, in any way,
superceed or replace the license texts.
2017-11-27 15:17:37 +00:00

132 lines
3.7 KiB
C

/*-
* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
*
* Copyright (c) 2005 Pawel Jakub Dawidek <pjd@FreeBSD.org>
* 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 AUTHORS 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 AUTHORS 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.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/param.h>
#ifdef _KERNEL
#include <sys/systm.h>
#include <sys/kernel.h>
#else
#include <sys/resource.h>
#include <stdint.h>
#include <strings.h>
#endif
#include <geom/eli/g_eli.h>
#include <geom/eli/pkcs5v2.h>
static __inline void
xor(uint8_t *dst, const uint8_t *src, size_t size)
{
for (; size > 0; size--)
*dst++ ^= *src++;
}
void
pkcs5v2_genkey(uint8_t *key, unsigned keylen, const uint8_t *salt,
size_t saltsize, const char *passphrase, u_int iterations)
{
uint8_t md[SHA512_MDLEN], saltcount[saltsize + sizeof(uint32_t)];
uint8_t *counter, *keyp;
u_int i, bsize, passlen;
uint32_t count;
struct hmac_ctx startpoint, ctx;
passlen = strlen(passphrase);
bzero(key, keylen);
bcopy(salt, saltcount, saltsize);
counter = saltcount + saltsize;
keyp = key;
for (count = 1; keylen > 0; count++, keylen -= bsize, keyp += bsize) {
bsize = MIN(keylen, sizeof(md));
be32enc(counter, count);
g_eli_crypto_hmac_init(&startpoint, passphrase, passlen);
ctx = startpoint;
g_eli_crypto_hmac_update(&ctx, saltcount, sizeof(saltcount));
g_eli_crypto_hmac_final(&ctx, md, sizeof(md));
xor(keyp, md, bsize);
for(i = 1; i < iterations; i++) {
ctx = startpoint;
g_eli_crypto_hmac_update(&ctx, md, sizeof(md));
g_eli_crypto_hmac_final(&ctx, md, sizeof(md));
xor(keyp, md, bsize);
}
}
explicit_bzero(&startpoint, sizeof(startpoint));
explicit_bzero(&ctx, sizeof(ctx));
}
#ifndef _KERNEL
#ifndef _STAND
/*
* Return the number of microseconds needed for 'interations' iterations.
*/
static int
pkcs5v2_probe(int iterations)
{
uint8_t key[G_ELI_USERKEYLEN], salt[G_ELI_SALTLEN];
uint8_t passphrase[] = "passphrase";
struct rusage start, end;
int usecs;
getrusage(RUSAGE_SELF, &start);
pkcs5v2_genkey(key, sizeof(key), salt, sizeof(salt), passphrase,
iterations);
getrusage(RUSAGE_SELF, &end);
usecs = end.ru_utime.tv_sec - start.ru_utime.tv_sec;
usecs *= 1000000;
usecs += end.ru_utime.tv_usec - start.ru_utime.tv_usec;
return (usecs);
}
/*
* Return the number of iterations which takes 'usecs' microseconds.
*/
int
pkcs5v2_calculate(int usecs)
{
int iterations, v;
for (iterations = 1; ; iterations <<= 1) {
v = pkcs5v2_probe(iterations);
if (v > 2000000)
break;
}
return (((intmax_t)iterations * (intmax_t)usecs) / v);
}
#endif /* !_STAND */
#endif /* !_KERNEL */