-/*
- * 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;
-}
-
projects / apple / xnu.git / blobdiff