diff options
Diffstat (limited to 'sys/crypto/rc5/rc5.c')
| -rw-r--r-- | sys/crypto/rc5/rc5.c | 218 |
1 files changed, 218 insertions, 0 deletions
diff --git a/sys/crypto/rc5/rc5.c b/sys/crypto/rc5/rc5.c new file mode 100644 index 0000000..52ccdd1 --- /dev/null +++ b/sys/crypto/rc5/rc5.c @@ -0,0 +1,218 @@ +/* + * 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. + * + * $FreeBSD$ + */ +#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; +} + |
