mirror of
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686cdd19b1
API changes: - additional IPv6 ioctls - IPsec PF_KEY API was changed, it is mandatory to upgrade setkey(8). (also syntax change)
344 lines
8.4 KiB
C
344 lines
8.4 KiB
C
/* $FreeBSD$ */
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/* $KAME: bf_cbc_m.c,v 1.4 2000/06/14 10:41:16 itojun Exp $ */
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/*
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* heavily modified to accept mbuf, by Jun-ichiro itojun Itoh
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* <itojun@itojun.org>, 1997.
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*/
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/* crypto/bf/bf_cbc.c */
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/* Copyright (C) 1995-1997 Eric Young (eay@mincom.oz.au)
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* All rights reserved.
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*
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* This package is an SSL implementation written
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* by Eric Young (eay@mincom.oz.au).
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* The implementation was written so as to conform with Netscapes SSL.
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*
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* This library is free for commercial and non-commercial use as long as
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* the following conditions are aheared to. The following conditions
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* apply to all code found in this distribution, be it the RC4, RSA,
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* lhash, DES, etc., code; not just the SSL code. The SSL documentation
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* included with this distribution is covered by the same copyright terms
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* except that the holder is Tim Hudson (tjh@mincom.oz.au).
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*
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* Copyright remains Eric Young's, and as such any Copyright notices in
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* the code are not to be removed.
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* If this package is used in a product, Eric Young should be given attribution
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* as the author of the parts of the library used.
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* This can be in the form of a textual message at program startup or
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* in documentation (online or textual) provided with the package.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* "This product includes cryptographic software written by
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* Eric Young (eay@mincom.oz.au)"
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* The word 'cryptographic' can be left out if the rouines from the library
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* being used are not cryptographic related :-).
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* 4. If you include any Windows specific code (or a derivative thereof) from
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* the apps directory (application code) you must include an acknowledgement:
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* "This product includes software written by Tim Hudson (tjh@mincom.oz.au)"
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*
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* THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* The licence and distribution terms for any publically available version or
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* derivative of this code cannot be changed. i.e. this code cannot simply be
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* copied and put under another distribution licence
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* [including the GNU Public Licence.]
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*/
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#include <sys/param.h>
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#include <sys/mbuf.h>
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#include <sys/systm.h>
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#include <crypto/blowfish/blowfish.h>
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#include <crypto/blowfish/bf_locl.h>
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#define panic(x) do { printf(x); return EINVAL; } while (0)
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int BF_cbc_encrypt_m(m0, skip, length, key, iv, mode)
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struct mbuf *m0;
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int skip;
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int length;
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BF_KEY *key;
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unsigned char *iv;
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int mode;
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{
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u_int8_t inbuf[8], outbuf[8];
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struct mbuf *m;
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size_t off;
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register BF_LONG tin0, tin1;
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register BF_LONG tout0, tout1;
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BF_LONG tin[2];
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/* sanity checks */
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if (m0->m_pkthdr.len < skip) {
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printf("mbuf length < skip\n");
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return EINVAL;
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}
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if (m0->m_pkthdr.len < length) {
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printf("mbuf length < encrypt length\n");
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return EINVAL;
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}
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if (m0->m_pkthdr.len < skip + length) {
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printf("mbuf length < skip + encrypt length\n");
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return EINVAL;
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}
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if (length % 8) {
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printf("length is not multiple of 8\n");
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return EINVAL;
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}
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m = m0;
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off = 0;
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/* skip over the header */
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while (skip) {
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if (!m)
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panic("mbuf chain?\n");
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if (m->m_len <= skip) {
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skip -= m->m_len;
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m = m->m_next;
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off = 0;
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} else {
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off = skip;
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skip = 0;
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}
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}
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/* initialize */
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tin0 = tin1 = tout0 = tout1 = 0;
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tin[0] = tin[1] = 0;
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if (mode == BF_ENCRYPT) {
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u_int8_t *in, *out;
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n2l(iv, tout0);
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n2l(iv, tout1);
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while (0 < length) {
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if (!m)
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panic("mbuf chain?\n");
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/*
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* copy the source into input buffer.
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* don't update off or m, since we need to use them * later.
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*/
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if (off + 8 <= m->m_len)
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bcopy(mtod(m, u_int8_t *) + off, &inbuf[0], 8);
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else {
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struct mbuf *n;
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size_t noff;
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u_int8_t *p;
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u_int8_t *in;
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n = m;
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noff = off;
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p = mtod(n, u_int8_t *) + noff;
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in = &inbuf[0];
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while (in - &inbuf[0] < 8) {
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if (!p)
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panic("mbuf chain?\n");
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*in++ = *p++;
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noff++;
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if (noff < n->m_len)
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continue;
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do {
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n = n->m_next;
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} while (n && ! n->m_len);
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noff = 0;
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if (n)
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p = mtod(n, u_int8_t *) + noff;
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else
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p = NULL;
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}
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}
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in = &inbuf[0];
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out = &outbuf[0];
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n2l(in, tin0);
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n2l(in, tin1);
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tin0 ^= tout0; tin[0] = tin0;
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tin1 ^= tout1; tin[1] = tin1;
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BF_encrypt(tin, key, BF_ENCRYPT);
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tout0 = tin[0]; l2n(tout0, out);
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tout1 = tin[1]; l2n(tout1, out);
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/*
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* copy the output buffer into the result.
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* need to update off and m.
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*/
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if (off + 8 < m->m_len) {
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bcopy(&outbuf[0], mtod(m, u_int8_t *) + off, 8);
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off += 8;
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} else if (off + 8 == m->m_len) {
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bcopy(&outbuf[0], mtod(m, u_int8_t *) + off, 8);
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do {
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m = m->m_next;
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} while (m && ! m->m_len);
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off = 0;
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} else {
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struct mbuf *n;
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size_t noff;
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u_int8_t *p;
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u_int8_t *out;
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n = m;
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noff = off;
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p = mtod(n, u_int8_t *) + noff;
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out = &outbuf[0];
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while (out - &outbuf[0] < 8) {
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if (!p)
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panic("mbuf chain?");
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*p++ = *out++;
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noff++;
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if (noff < n->m_len)
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continue;
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do {
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n = n->m_next;
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} while (n && ! n->m_len);
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noff = 0;
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if (n)
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p = mtod(n, u_int8_t *) + noff;
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else
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p = NULL;
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}
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m = n;
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off = noff;
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}
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length -= 8;
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}
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} else if (mode == BF_DECRYPT) {
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register BF_LONG xor0, xor1;
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u_int8_t *in, *out;
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xor0 = xor1 = 0;
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n2l(iv, xor0);
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n2l(iv, xor1);
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while (0 < length) {
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if (!m)
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panic("mbuf chain?\n");
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/*
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* copy the source into input buffer.
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* don't update off or m, since we need to use them * later.
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*/
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if (off + 8 <= m->m_len)
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bcopy(mtod(m, u_int8_t *) + off, &inbuf[0], 8);
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else {
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struct mbuf *n;
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size_t noff;
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u_int8_t *p;
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u_int8_t *in;
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n = m;
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noff = off;
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p = mtod(n, u_int8_t *) + noff;
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in = &inbuf[0];
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while (in - &inbuf[0] < 8) {
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if (!p)
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panic("mbuf chain?\n");
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*in++ = *p++;
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noff++;
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if (noff < n->m_len)
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continue;
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do {
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n = n->m_next;
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} while (n && ! n->m_len);
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noff = 0;
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if (n)
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p = mtod(n, u_int8_t *) + noff;
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else
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p = NULL;
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}
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}
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in = &inbuf[0];
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out = &outbuf[0];
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n2l(in, tin0); tin[0] = tin0;
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n2l(in, tin1); tin[1] = tin1;
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BF_encrypt(tin, key, BF_DECRYPT);
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tout0 = tin[0] ^ xor0;
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tout1 = tin[1] ^ xor1;
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l2n(tout0, out);
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l2n(tout1, out);
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xor0 = tin0;
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xor1 = tin1;
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/*
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* copy the output buffer into the result.
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* need to update off and m.
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*/
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if (off + 8 < m->m_len) {
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bcopy(&outbuf[0], mtod(m, u_int8_t *) + off, 8);
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off += 8;
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} else if (off + 8 == m->m_len) {
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bcopy(&outbuf[0], mtod(m, u_int8_t *) + off, 8);
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do {
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m = m->m_next;
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} while (m && ! m->m_len);
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off = 0;
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} else {
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struct mbuf *n;
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size_t noff;
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u_int8_t *p;
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u_int8_t *out;
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n = m;
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noff = off;
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p = mtod(n, u_int8_t *) + noff;
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out = &outbuf[0];
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while (out - &outbuf[0] < 8) {
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if (!p)
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panic("mbuf chain?\n");
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*p++ = *out++;
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noff++;
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if (noff < n->m_len)
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continue;
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do {
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n = n->m_next;
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} while (n && ! n->m_len);
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noff = 0;
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if (n)
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p = mtod(n, u_int8_t *) + noff;
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else
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p = NULL;
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}
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m = n;
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off = noff;
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}
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length -= 8;
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}
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}
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return 0;
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}
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