-/*
- * 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.
- */
-/*
- * based on sys/crypto/des/des_cbc.c, rewrote by Tomomi Suzuki
- */
-#include <crypto/rc5/rc5.h>
-
-
-void
-rc5_cbc_process(m0, skip, length, e_key, iv, mode)
- struct mbuf *m0;
- size_t skip;
- size_t length;
- RC5_WORD *e_key;
- u_int8_t *iv;
- int mode;
-{
- u_int8_t inbuf[8], outbuf[8];
- struct mbuf *m;
- size_t off;
-
- /* sanity check */
- if (m0->m_pkthdr.len < skip) {
- printf("rc5_cbc_process: mbuf length < skip\n");
- return;
- }
- if (m0->m_pkthdr.len < length) {
- printf("rc5_cbc_process: mbuf length < encrypt length\n");
- return;
- }
- if (m0->m_pkthdr.len < skip + length) {
- printf("rc5_cbc_process: mbuf length < "
- "skip + encrypt length\n");
- return;
- }
- if (length % 8) {
- printf("rc5_cbc_process: length(%lu)is not multipleof 8\n",
- (u_long)length);
- return;
- }
-
- m = m0;
- off = 0;
-
- /* skip over the header */
- while (skip) {
- if (!m)
- panic("rc5_cbc_process: mbuf chain?\n");
- if (m->m_len <= skip) {
- skip -= m->m_len;
- m = m->m_next;
- off = 0;
- } else {
- off = skip;
- skip = 0;
- }
- }
-
- /* copy iv into outbuf for XOR (encrypt) */
- bcopy(iv, outbuf, 8);
-
- /*
- * encrypt/decrypt packet
- */
- while (length > 0) {
- int i;
-
- if (!m)
- panic("rc5_cbc_process: mbuf chain?\n");
-
- /*
- * copy the source into input buffer.
- * don't update off or m, since we need to use them
- * later.
- */
- if (off + 8 <= m->m_len)
- bcopy(mtod(m, u_int8_t *) + off, &inbuf[0], 8);
- else {
- struct mbuf *n;
- size_t noff;
- u_int8_t *p;
- u_int8_t *in;
-
- n = m;
- noff = off;
- p = mtod(n, u_int8_t *) + noff;
-
- in = &inbuf[0];
- while (in - &inbuf[0] < 8) {
- if (!p) {
- panic("rc5_cbc_process: "
- "mbuf chain?\n");
- }
- *in++ = *p++;
- noff++;
- if (noff < n->m_len)
- continue;
- do {
- n = n->m_next;
- } while (n && !n->m_len);
- noff = 0;
- if (n)
- p = mtod(n, u_int8_t *) + noff;
- else
- p = NULL;
- }
- }
-
- /* encrypt/decrypt */
- switch (mode) {
- case RC5_ENCRYPT:
- /* XOR */
- for (i = 0; i < 8; i++)
- inbuf[i] ^= outbuf[i];
-
- /* encrypt */
- rc5_encrypt_round16(outbuf, inbuf, e_key);
- break;
-
- case RC5_DECRYPT:
- /* decrypt */
- rc5_decrypt_round16(outbuf, inbuf, e_key);
-
- /* XOR */
- for (i = 0; i < 8; i++)
- outbuf[i] ^= iv[i];
-
- /* copy inbuf into iv for next XOR */
- bcopy(inbuf, iv, 8);
- break;
- }
-
- /*
- * copy the output buffer into the result.
- * need to update off and m.
- */
- if (off + 8 < m->m_len) {
- bcopy(&outbuf[0], mtod(m, u_int8_t *) + off, 8);
- off += 8;
- } else if (off + 8 == m->m_len) {
- bcopy(&outbuf[0], mtod(m, u_int8_t *) + off, 8);
- do {
- m = m->m_next;
- } while (m && !m->m_len);
- off = 0;
- } else {
- struct mbuf *n;
- size_t noff;
- u_int8_t *p;
- u_int8_t *out;
-
- n = m;
- noff = off;
- p = mtod(n, u_int8_t *) + noff;
-
- out = &outbuf[0];
- while (out - &outbuf[0] < 8) {
- if (!p) {
- panic("rc5_cbc_process: "
- "mbuf chain?\n");
- }
- *p++ = *out++;
- noff++;
- if (noff < n->m_len)
- continue;
- do {
- n = n->m_next;
- } while (n && !n->m_len);
- noff = 0;
- if (n)
- p = mtod(n, u_int8_t *) + noff;
- else
- p = NULL;
- }
-
- m = n;
- off = noff;
- }
-
- length -= 8;
- }
-}
-
projects / apple / xnu.git / blobdiff