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NetBSD/sys/crypto/blowfish/bf_cbc_m.c

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/* $NetBSD: bf_cbc_m.c,v 1.2 2000/08/31 06:46:21 itojun Exp $ */
/* $KAME: bf_cbc_m.c,v 1.5 2000/08/31 05:41:03 itojun Exp $ */
/*
* heavily modified to accept mbuf, by Jun-ichiro itojun Itoh
* <itojun@itojun.org>, 1997.
*/
/* crypto/bf/bf_cbc.c */
/* Copyright (C) 1995-1997 Eric Young (eay@mincom.oz.au)
* All rights reserved.
*
* This package is an SSL implementation written
* by Eric Young (eay@mincom.oz.au).
* The implementation was written so as to conform with Netscapes SSL.
*
* This library is free for commercial and non-commercial use as long as
* the following conditions are aheared to. The following conditions
* apply to all code found in this distribution, be it the RC4, RSA,
* lhash, DES, etc., code; not just the SSL code. The SSL documentation
* included with this distribution is covered by the same copyright terms
* except that the holder is Tim Hudson (tjh@mincom.oz.au).
*
* Copyright remains Eric Young's, and as such any Copyright notices in
* the code are not to be removed.
* If this package is used in a product, Eric Young should be given attribution
* as the author of the parts of the library used.
* This can be in the form of a textual message at program startup or
* in documentation (online or textual) provided with the package.
*
* 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 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. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* "This product includes cryptographic software written by
* Eric Young (eay@mincom.oz.au)"
* The word 'cryptographic' can be left out if the rouines from the library
* being used are not cryptographic related :-).
* 4. If you include any Windows specific code (or a derivative thereof) from
* the apps directory (application code) you must include an acknowledgement:
* "This product includes software written by Tim Hudson (tjh@mincom.oz.au)"
*
* THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``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 AUTHOR 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.
*
* The licence and distribution terms for any publically available version or
* derivative of this code cannot be changed. i.e. this code cannot simply be
* copied and put under another distribution licence
* [including the GNU Public Licence.]
*/
#include <sys/types.h>
#include <sys/param.h>
#include <sys/malloc.h>
#include <sys/mbuf.h>
#include <sys/systm.h>
#include <crypto/blowfish/blowfish.h>
#include <crypto/blowfish/bf_locl.h>
#define panic(x) do { printf(x); return EINVAL; } while (0)
int BF_cbc_encrypt_m(m0, skip, length, key, iv, mode)
struct mbuf *m0;
int skip;
int length;
BF_KEY *key;
unsigned char *iv;
int mode;
{
u_int8_t inbuf[8], outbuf[8];
struct mbuf *m;
size_t off;
register BF_LONG tin0, tin1;
register BF_LONG tout0, tout1;
BF_LONG tin[2];
/* sanity checks */
if (m0->m_pkthdr.len < skip) {
printf("mbuf length < skip\n");
return EINVAL;
}
if (m0->m_pkthdr.len < length) {
printf("mbuf length < encrypt length\n");
return EINVAL;
}
if (m0->m_pkthdr.len < skip + length) {
printf("mbuf length < skip + encrypt length\n");
return EINVAL;
}
if (length % 8) {
printf("length is not multiple of 8\n");
return EINVAL;
}
m = m0;
off = 0;
/* skip over the header */
while (skip) {
if (!m)
panic("mbuf chain?\n");
if (m->m_len <= skip) {
skip -= m->m_len;
m = m->m_next;
off = 0;
} else {
off = skip;
skip = 0;
}
}
/* initialize */
tin0 = tin1 = tout0 = tout1 = 0;
tin[0] = tin[1] = 0;
if (mode == BF_ENCRYPT) {
u_int8_t *in, *out;
n2l(iv, tout0);
n2l(iv, tout1);
while (0 < length) {
if (!m)
panic("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("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;
}
}
in = &inbuf[0];
out = &outbuf[0];
n2l(in, tin0);
n2l(in, tin1);
tin0 ^= tout0; tin[0] = tin0;
tin1 ^= tout1; tin[1] = tin1;
BF_encrypt(tin, key, BF_ENCRYPT);
tout0 = tin[0]; l2n(tout0, out);
tout1 = tin[1]; l2n(tout1, out);
/*
* 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("mbuf chain?");
*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;
}
} else if (mode == BF_DECRYPT) {
register BF_LONG xor0, xor1;
u_int8_t *in, *out;
xor0 = xor1 = 0;
n2l(iv, xor0);
n2l(iv, xor1);
while (0 < length) {
if (!m)
panic("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("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;
}
}
in = &inbuf[0];
out = &outbuf[0];
n2l(in, tin0); tin[0] = tin0;
n2l(in, tin1); tin[1] = tin1;
BF_encrypt(tin, key, BF_DECRYPT);
tout0 = tin[0] ^ xor0;
tout1 = tin[1] ^ xor1;
l2n(tout0, out);
l2n(tout1, out);
xor0 = tin0;
xor1 = tin1;
/*
* 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("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;
}
}
return 0;
}
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