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📄 Makefile.in(1.77 KB)
📄 arc4random.c(7.06 KB)
📄 base64.c(10.25 KB)
📄 base64.h(2.69 KB)
📄 basename.c(1.78 KB)
📄 bcrypt_pbkdf.c(5.38 KB)
📄 bindresvport.c(3.24 KB)
📄 blf.h(3.49 KB)
📄 blowfish.c(23.11 KB)
📄 bsd-asprintf.c(2.31 KB)
📄 bsd-closefrom.c(2.84 KB)
📄 bsd-cygwin_util.c(3.15 KB)
📄 bsd-cygwin_util.h(2.34 KB)
📄 bsd-err.c(2.15 KB)
📄 bsd-flock.c(2.23 KB)
📄 bsd-getline.c(2.9 KB)
📄 bsd-getpagesize.c(463 B)
📄 bsd-getpeereid.c(1.68 KB)
📄 bsd-malloc.c(1.4 KB)
📄 bsd-misc.c(5.88 KB)
📄 bsd-misc.h(3.61 KB)
📄 bsd-nextstep.c(2.5 KB)
📄 bsd-nextstep.h(2.22 KB)
📄 bsd-openpty.c(4.92 KB)
📄 bsd-poll.c(2.91 KB)
📄 bsd-poll.h(2.06 KB)
📄 bsd-setres_id.c(2.34 KB)
📄 bsd-setres_id.h(930 B)
📄 bsd-signal.c(1.55 KB)
📄 bsd-signal.h(1.15 KB)
📄 bsd-snprintf.c(20.58 KB)
📄 bsd-statvfs.c(2.09 KB)
📄 bsd-statvfs.h(2.24 KB)
📄 bsd-waitpid.c(1.77 KB)
📄 bsd-waitpid.h(2.02 KB)
📄 chacha_private.h(5.26 KB)
📄 charclass.h(702 B)
📄 daemon.c(2.32 KB)
📄 dirname.c(1.87 KB)
📄 explicit_bzero.c(1.09 KB)
📄 fake-rfc2553.c(6.15 KB)
📄 fake-rfc2553.h(5.2 KB)
📄 fmt_scaled.c(7.69 KB)
📄 freezero.c(1.01 KB)
📄 getcwd.c(5.95 KB)
📄 getgrouplist.c(2.7 KB)
📄 getopt.h(2.71 KB)
📄 getopt_long.c(14.46 KB)
📄 getrrsetbyname-ldns.c(7.81 KB)
📄 getrrsetbyname.c(13.56 KB)
📄 getrrsetbyname.h(3.62 KB)
📄 glob.c(25.53 KB)
📄 glob.h(4.54 KB)
📄 inet_aton.c(5.23 KB)
📄 inet_ntoa.c(2.21 KB)
📄 inet_ntop.c(5.42 KB)
📄 kludge-fd_set.c(882 B)
📄 libressl-api-compat.c(16.19 KB)
📄 md5.c(7.83 KB)
📄 md5.h(1.85 KB)
📄 mktemp.c(3.14 KB)
📄 openbsd-compat.h(8.68 KB)
📄 openssl-compat.c(2.43 KB)
📄 openssl-compat.h(7.22 KB)
📄 port-aix.c(12.61 KB)
📄 port-aix.h(4.22 KB)
📄 port-irix.c(2.94 KB)
📄 port-irix.h(1.65 KB)
📄 port-linux.c(7.66 KB)
📄 port-linux.h(1.18 KB)
📄 port-net.c(8.33 KB)
📄 port-net.h(1.58 KB)
📄 port-solaris.c(9.56 KB)
📄 port-solaris.h(1.27 KB)
📄 port-uw.c(4.16 KB)
📄 port-uw.h(1.37 KB)
📄 pwcache.c(3.22 KB)
📄 readpassphrase.c(5.79 KB)
📄 readpassphrase.h(1.75 KB)
📄 reallocarray.c(1.49 KB)
📄 realpath.c(6.08 KB)
📄 recallocarray.c(2.4 KB)
📁 regress
📄 rmd160.c(11.72 KB)
📄 rmd160.h(2.81 KB)
📄 rresvport.c(2.97 KB)
📄 setenv.c(5.76 KB)
📄 setproctitle.c(4.55 KB)
📄 sha1.c(5.18 KB)
📄 sha1.h(2.23 KB)
📄 sha2.c(24.88 KB)
📄 sha2.h(5.66 KB)
📄 sigact.c(3.82 KB)
📄 sigact.h(3.66 KB)
📄 strcasestr.c(2.35 KB)
📄 strlcat.c(1.76 KB)
📄 strlcpy.c(1.64 KB)
📄 strmode.c(3.38 KB)
📄 strndup.c(1.27 KB)
📄 strnlen.c(1.18 KB)
📄 strptime.c(9.28 KB)
📄 strsep.c(2.59 KB)
📄 strtoll.c(4.29 KB)
📄 strtonum.c(1.85 KB)
📄 strtoul.c(3.07 KB)
📄 strtoull.c(3.13 KB)
📄 sys-queue.h(21.04 KB)
📄 sys-tree.h(24.68 KB)
📄 timingsafe_bcmp.c(1.17 KB)
📄 vis.c(5.97 KB)
📄 vis.h(3.57 KB)
📄 xcrypt.c(4.26 KB)

Editing: bcrypt_pbkdf.c

/* $OpenBSD: bcrypt_pbkdf.c,v 1.13 2015/01/12 03:20:04 tedu Exp $ */
/*
 * Copyright (c) 2013 Ted Unangst <tedu@openbsd.org>
 *
 * Permission to use, copy, modify, and distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */

#include "includes.h"

#ifndef HAVE_BCRYPT_PBKDF

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

#ifdef HAVE_STDLIB_H
# include <stdlib.h>
#endif
#include <string.h>

#ifdef HAVE_BLF_H
# include <blf.h>
#endif

#include "crypto_api.h"
#ifdef SHA512_DIGEST_LENGTH
# undef SHA512_DIGEST_LENGTH
#endif
#define SHA512_DIGEST_LENGTH crypto_hash_sha512_BYTES

#define	MINIMUM(a,b) (((a) < (b)) ? (a) : (b))

/*
 * pkcs #5 pbkdf2 implementation using the "bcrypt" hash
 *
 * The bcrypt hash function is derived from the bcrypt password hashing
 * function with the following modifications:
 * 1. The input password and salt are preprocessed with SHA512.
 * 2. The output length is expanded to 256 bits.
 * 3. Subsequently the magic string to be encrypted is lengthened and modified
 *    to "OxychromaticBlowfishSwatDynamite"
 * 4. The hash function is defined to perform 64 rounds of initial state
 *    expansion. (More rounds are performed by iterating the hash.)
 *
 * Note that this implementation pulls the SHA512 operations into the caller
 * as a performance optimization.
 *
 * One modification from official pbkdf2. Instead of outputting key material
 * linearly, we mix it. pbkdf2 has a known weakness where if one uses it to
 * generate (e.g.) 512 bits of key material for use as two 256 bit keys, an
 * attacker can merely run once through the outer loop, but the user
 * always runs it twice. Shuffling output bytes requires computing the
 * entirety of the key material to assemble any subkey. This is something a
 * wise caller could do; we just do it for you.
 */

#define BCRYPT_WORDS 8
#define BCRYPT_HASHSIZE (BCRYPT_WORDS * 4)

static void
bcrypt_hash(u_int8_t *sha2pass, u_int8_t *sha2salt, u_int8_t *out)
{
	blf_ctx state;
	u_int8_t ciphertext[BCRYPT_HASHSIZE] =
	    "OxychromaticBlowfishSwatDynamite";
	uint32_t cdata[BCRYPT_WORDS];
	int i;
	uint16_t j;
	size_t shalen = SHA512_DIGEST_LENGTH;

/* key expansion */
	Blowfish_initstate(&state);
	Blowfish_expandstate(&state, sha2salt, shalen, sha2pass, shalen);
	for (i = 0; i < 64; i++) {
		Blowfish_expand0state(&state, sha2salt, shalen);
		Blowfish_expand0state(&state, sha2pass, shalen);
	}

/* encryption */
	j = 0;
	for (i = 0; i < BCRYPT_WORDS; i++)
		cdata[i] = Blowfish_stream2word(ciphertext, sizeof(ciphertext),
		    &j);
	for (i = 0; i < 64; i++)
		blf_enc(&state, cdata, sizeof(cdata) / sizeof(uint64_t));

/* copy out */
	for (i = 0; i < BCRYPT_WORDS; i++) {
		out[4 * i + 3] = (cdata[i] >> 24) & 0xff;
		out[4 * i + 2] = (cdata[i] >> 16) & 0xff;
		out[4 * i + 1] = (cdata[i] >> 8) & 0xff;
		out[4 * i + 0] = cdata[i] & 0xff;
	}

/* zap */
	explicit_bzero(ciphertext, sizeof(ciphertext));
	explicit_bzero(cdata, sizeof(cdata));
	explicit_bzero(&state, sizeof(state));
}

int
bcrypt_pbkdf(const char *pass, size_t passlen, const u_int8_t *salt, size_t saltlen,
    u_int8_t *key, size_t keylen, unsigned int rounds)
{
	u_int8_t sha2pass[SHA512_DIGEST_LENGTH];
	u_int8_t sha2salt[SHA512_DIGEST_LENGTH];
	u_int8_t out[BCRYPT_HASHSIZE];
	u_int8_t tmpout[BCRYPT_HASHSIZE];
	u_int8_t *countsalt;
	size_t i, j, amt, stride;
	uint32_t count;
	size_t origkeylen = keylen;

/* nothing crazy */
	if (rounds < 1)
		return -1;
	if (passlen == 0 || saltlen == 0 || keylen == 0 ||
	    keylen > sizeof(out) * sizeof(out) || saltlen > 1<<20)
		return -1;
	if ((countsalt = calloc(1, saltlen + 4)) == NULL)
		return -1;
	stride = (keylen + sizeof(out) - 1) / sizeof(out);
	amt = (keylen + stride - 1) / stride;

memcpy(countsalt, salt, saltlen);

/* collapse password */
	crypto_hash_sha512(sha2pass, pass, passlen);

/* generate key, sizeof(out) at a time */
	for (count = 1; keylen > 0; count++) {
		countsalt[saltlen + 0] = (count >> 24) & 0xff;
		countsalt[saltlen + 1] = (count >> 16) & 0xff;
		countsalt[saltlen + 2] = (count >> 8) & 0xff;
		countsalt[saltlen + 3] = count & 0xff;

/* first round, salt is salt */
		crypto_hash_sha512(sha2salt, countsalt, saltlen + 4);

bcrypt_hash(sha2pass, sha2salt, tmpout);
		memcpy(out, tmpout, sizeof(out));

for (i = 1; i < rounds; i++) {
			/* subsequent rounds, salt is previous output */
			crypto_hash_sha512(sha2salt, tmpout, sizeof(tmpout));
			bcrypt_hash(sha2pass, sha2salt, tmpout);
			for (j = 0; j < sizeof(out); j++)
				out[j] ^= tmpout[j];
		}

/*
		 * pbkdf2 deviation: output the key material non-linearly.
		 */
		amt = MINIMUM(amt, keylen);
		for (i = 0; i < amt; i++) {
			size_t dest = i * stride + (count - 1);
			if (dest >= origkeylen)
				break;
			key[dest] = out[i];
		}
		keylen -= i;
	}

/* zap */
	explicit_bzero(out, sizeof(out));
	free(countsalt);

return 0;
}
#endif /* HAVE_BCRYPT_PBKDF */

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Editing: bcrypt_pbkdf.c

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