freebsd-dev/sys/crypto/rc5/rc5.c

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/* $FreeBSD$ */
/* $KAME: rc5.c,v 1.3 2000/03/27 04:36:36 sumikawa Exp $ */
/*
* Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
* 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.
* 3. Neither the name of the project nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE PROJECT 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 PROJECT 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 <crypto/rc5/rc5.h>
void
set_rc5_expandkey(e_key, key, keylen, rounds)
RC5_WORD *e_key;
u_int8_t *key;
size_t keylen;
int rounds;
{
int i, j, k, LL, t, T;
RC5_WORD L[256/WW];
RC5_WORD A, B;
LL = (keylen + WW - 1) / WW;
bzero(L, sizeof(RC5_WORD)*LL);
for (i = 0; i < keylen; i++) {
t = (key[i] & 0xff) << (8*(i%4));
L[i/WW] = L[i/WW] + t;
}
T = 2 * (rounds + 1);
e_key[0] = Pw;
for (i = 1; i < T; i++)
e_key[i] = e_key[i-1] + Qw;
i = j = 0;
A = B = 0;
if (LL > T)
k = 3 * LL;
else
k = 3 * T;
for (; k > 0; k--) {
A = ROTL(e_key[i]+A+B, 3, W);
e_key[i] = A;
B = ROTL(L[j]+A+B, A+B, W);
L[j] = B;
i = (i + 1) % T;
j = (j + 1) % LL;
}
}
/*
*
*/
void
rc5_encrypt_round16(out, in, e_key)
u_int8_t *out;
const u_int8_t *in;
const RC5_WORD *e_key;
{
RC5_WORD A, B;
const RC5_WORD *e_keyA, *e_keyB;
A = in[0] & 0xff;
A += (in[1] & 0xff) << 8;
A += (in[2] & 0xff) << 16;
A += (in[3] & 0xff) << 24;
B = in[4] & 0xff;
B += (in[5] & 0xff) << 8;
B += (in[6] & 0xff) << 16;
B += (in[7] & 0xff) << 24;
e_keyA = e_key;
e_keyB = e_key + 1;
A += *e_keyA; e_keyA += 2;
B += *e_keyB; e_keyB += 2;
A = ROTL(A^B, B, W) + *e_keyA; e_keyA += 2;
B = ROTL(B^A, A, W) + *e_keyB; e_keyB += 2;
A = ROTL(A^B, B, W) + *e_keyA; e_keyA += 2;
B = ROTL(B^A, A, W) + *e_keyB; e_keyB += 2;
A = ROTL(A^B, B, W) + *e_keyA; e_keyA += 2;
B = ROTL(B^A, A, W) + *e_keyB; e_keyB += 2;
A = ROTL(A^B, B, W) + *e_keyA; e_keyA += 2;
B = ROTL(B^A, A, W) + *e_keyB; e_keyB += 2; /* round 4 */
A = ROTL(A^B, B, W) + *e_keyA; e_keyA += 2;
B = ROTL(B^A, A, W) + *e_keyB; e_keyB += 2;
A = ROTL(A^B, B, W) + *e_keyA; e_keyA += 2;
B = ROTL(B^A, A, W) + *e_keyB; e_keyB += 2;
A = ROTL(A^B, B, W) + *e_keyA; e_keyA += 2;
B = ROTL(B^A, A, W) + *e_keyB; e_keyB += 2;
A = ROTL(A^B, B, W) + *e_keyA; e_keyA += 2;
B = ROTL(B^A, A, W) + *e_keyB; e_keyB += 2; /* round 8 */
A = ROTL(A^B, B, W) + *e_keyA; e_keyA += 2;
B = ROTL(B^A, A, W) + *e_keyB; e_keyB += 2;
A = ROTL(A^B, B, W) + *e_keyA; e_keyA += 2;
B = ROTL(B^A, A, W) + *e_keyB; e_keyB += 2;
A = ROTL(A^B, B, W) + *e_keyA; e_keyA += 2;
B = ROTL(B^A, A, W) + *e_keyB; e_keyB += 2;
A = ROTL(A^B, B, W) + *e_keyA; e_keyA += 2;
B = ROTL(B^A, A, W) + *e_keyB; e_keyB += 2; /* round 12 */
A = ROTL(A^B, B, W) + *e_keyA; e_keyA += 2;
B = ROTL(B^A, A, W) + *e_keyB; e_keyB += 2;
A = ROTL(A^B, B, W) + *e_keyA; e_keyA += 2;
B = ROTL(B^A, A, W) + *e_keyB; e_keyB += 2;
A = ROTL(A^B, B, W) + *e_keyA; e_keyA += 2;
B = ROTL(B^A, A, W) + *e_keyB; e_keyB += 2;
A = ROTL(A^B, B, W) + *e_keyA; e_keyA += 2;
B = ROTL(B^A, A, W) + *e_keyB; e_keyB += 2; /* round 16 */
out[0] = A & 0xff;
out[1] = (A >> 8) & 0xff;
out[2] = (A >> 16) & 0xff;
out[3] = (A >> 24) & 0xff;
out[4] = B & 0xff;
out[5] = (B >> 8) & 0xff;
out[6] = (B >> 16) & 0xff;
out[7] = (B >> 24) & 0xff;
}
/*
*
*/
void
rc5_decrypt_round16(out, in, e_key)
u_int8_t *out;
const u_int8_t *in;
const RC5_WORD *e_key;
{
RC5_WORD A, B;
const RC5_WORD *e_keyA, *e_keyB;
A = in[0] & 0xff;
A += (in[1] & 0xff) << 8;
A += (in[2] & 0xff) << 16;
A += (in[3] & 0xff) << 24;
B = in[4] & 0xff;
B += (in[5] & 0xff) << 8;
B += (in[6] & 0xff) << 16;
B += (in[7] & 0xff) << 24;
e_keyA = e_key + 2*16;
e_keyB = e_key + 2*16 + 1;
B = ROTR(B-*e_keyB, A, W) ^ A; e_keyB -= 2;
A = ROTR(A-*e_keyA, B, W) ^ B; e_keyA -= 2;
B = ROTR(B-*e_keyB, A, W) ^ A; e_keyB -= 2;
A = ROTR(A-*e_keyA, B, W) ^ B; e_keyA -= 2;
B = ROTR(B-*e_keyB, A, W) ^ A; e_keyB -= 2;
A = ROTR(A-*e_keyA, B, W) ^ B; e_keyA -= 2;
B = ROTR(B-*e_keyB, A, W) ^ A; e_keyB -= 2;
A = ROTR(A-*e_keyA, B, W) ^ B; e_keyA -= 2; /* round 4 */
B = ROTR(B-*e_keyB, A, W) ^ A; e_keyB -= 2;
A = ROTR(A-*e_keyA, B, W) ^ B; e_keyA -= 2;
B = ROTR(B-*e_keyB, A, W) ^ A; e_keyB -= 2;
A = ROTR(A-*e_keyA, B, W) ^ B; e_keyA -= 2;
B = ROTR(B-*e_keyB, A, W) ^ A; e_keyB -= 2;
A = ROTR(A-*e_keyA, B, W) ^ B; e_keyA -= 2;
B = ROTR(B-*e_keyB, A, W) ^ A; e_keyB -= 2;
A = ROTR(A-*e_keyA, B, W) ^ B; e_keyA -= 2; /* round 8 */
B = ROTR(B-*e_keyB, A, W) ^ A; e_keyB -= 2;
A = ROTR(A-*e_keyA, B, W) ^ B; e_keyA -= 2;
B = ROTR(B-*e_keyB, A, W) ^ A; e_keyB -= 2;
A = ROTR(A-*e_keyA, B, W) ^ B; e_keyA -= 2;
B = ROTR(B-*e_keyB, A, W) ^ A; e_keyB -= 2;
A = ROTR(A-*e_keyA, B, W) ^ B; e_keyA -= 2;
B = ROTR(B-*e_keyB, A, W) ^ A; e_keyB -= 2;
A = ROTR(A-*e_keyA, B, W) ^ B; e_keyA -= 2; /* round 12 */
B = ROTR(B-*e_keyB, A, W) ^ A; e_keyB -= 2;
A = ROTR(A-*e_keyA, B, W) ^ B; e_keyA -= 2;
B = ROTR(B-*e_keyB, A, W) ^ A; e_keyB -= 2;
A = ROTR(A-*e_keyA, B, W) ^ B; e_keyA -= 2;
B = ROTR(B-*e_keyB, A, W) ^ A; e_keyB -= 2;
A = ROTR(A-*e_keyA, B, W) ^ B; e_keyA -= 2;
B = ROTR(B-*e_keyB, A, W) ^ A; e_keyB -= 2;
A = ROTR(A-*e_keyA, B, W) ^ B; e_keyA -= 2; /* round 16 */
B = B - *e_keyB;
A = A - *e_keyA;
out[0] = A & 0xff;
out[1] = (A >> 8) & 0xff;
out[2] = (A >> 16) & 0xff;
out[3] = (A >> 24) & 0xff;
out[4] = B & 0xff;
out[5] = (B >> 8) & 0xff;
out[6] = (B >> 16) & 0xff;
out[7] = (B >> 24) & 0xff;
}