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Crypto build cleanup: remove NEED_FIPS186_2_PRF

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Instead of using a define and conditional building of crypto wrapper
parts, move the FIPS 186-2 PRF implementation into separate files.
This commit is contained in:
Johannes Berg 2009-08-11 20:06:23 +03:00 • committed by Jouni Malinen
parent ad01a5315e
commit 05edfe2994
8 changed files with 210 additions and 142 deletions
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75
src/crypto/fips_prf_internal.c Normal file
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/*
* FIPS 186-2 PRF for internal crypto implementation
* Copyright (c) 2006-2007, Jouni Malinen <j@w1.fi>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
* Alternatively, this software may be distributed under the terms of BSD
* license.
*
* See README and COPYING for more details.
*/
#include "includes.h"
#include "common.h"
#include "sha1.h"
#include "crypto.h"
void SHA1Transform(u32 state[5], const unsigned char buffer[64]);
int fips186_2_prf(const u8 *seed, size_t seed_len, u8 *x, size_t xlen)
{
u8 xkey[64];
u32 t[5], _t[5];
int i, j, m, k;
u8 *xpos = x;
u32 carry;
if (seed_len > sizeof(xkey))
seed_len = sizeof(xkey);
/* FIPS 186-2 + change notice 1 */
os_memcpy(xkey, seed, seed_len);
os_memset(xkey + seed_len, 0, 64 - seed_len);
t[0] = 0x67452301;
t[1] = 0xEFCDAB89;
t[2] = 0x98BADCFE;
t[3] = 0x10325476;
t[4] = 0xC3D2E1F0;
m = xlen / 40;
for (j = 0; j < m; j++) {
/* XSEED_j = 0 */
for (i = 0; i < 2; i++) {
/* XVAL = (XKEY + XSEED_j) mod 2^b */
/* w_i = G(t, XVAL) */
os_memcpy(_t, t, 20);
SHA1Transform(_t, xkey);
_t[0] = host_to_be32(_t[0]);
_t[1] = host_to_be32(_t[1]);
_t[2] = host_to_be32(_t[2]);
_t[3] = host_to_be32(_t[3]);
_t[4] = host_to_be32(_t[4]);
os_memcpy(xpos, _t, 20);
/* XKEY = (1 + XKEY + w_i) mod 2^b */
carry = 1;
for (k = 19; k >= 0; k--) {
carry += xkey[k] + xpos[k];
xkey[k] = carry & 0xff;
carry >>= 8;
}
xpos += SHA1_MAC_LEN;
}
/* x_j = w_0|w_1 */
}
return 0;
}