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openssl1.0/crypto/bf/bf_enc.c
Mario Fetka 33f8b6874c Imported Upstream version 1.0.2s
2019-08-09 10:00:55 +02:00

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/* crypto/bf/bf_enc.c */
/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
* All rights reserved.
*
* This package is an SSL implementation written
* by Eric Young (eay@cryptsoft.com).
* 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@cryptsoft.com).
*
* 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@cryptsoft.com)"
* 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@cryptsoft.com)"
*
* 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 <openssl/blowfish.h>
#include "bf_locl.h"
/*
* Blowfish as implemented from 'Blowfish: Springer-Verlag paper' (From
* LECTURE NOTES IN COMPUTER SCIENCE 809, FAST SOFTWARE ENCRYPTION, CAMBRIDGE
* SECURITY WORKSHOP, CAMBRIDGE, U.K., DECEMBER 9-11, 1993)
*/
#if (BF_ROUNDS != 16) && (BF_ROUNDS != 20)
# error If you set BF_ROUNDS to some value other than 16 or 20, you will have \
to modify the code.
#endif
void BF_encrypt(BF_LONG *data, const BF_KEY *key)
{
#ifndef BF_PTR2
register BF_LONG l, r;
register const BF_LONG *p, *s;
p = key->P;
s = &(key->S[0]);
l = data[0];
r = data[1];
l ^= p[0];
BF_ENC(r, l, s, p[1]);
BF_ENC(l, r, s, p[2]);
BF_ENC(r, l, s, p[3]);
BF_ENC(l, r, s, p[4]);
BF_ENC(r, l, s, p[5]);
BF_ENC(l, r, s, p[6]);
BF_ENC(r, l, s, p[7]);
BF_ENC(l, r, s, p[8]);
BF_ENC(r, l, s, p[9]);
BF_ENC(l, r, s, p[10]);
BF_ENC(r, l, s, p[11]);
BF_ENC(l, r, s, p[12]);
BF_ENC(r, l, s, p[13]);
BF_ENC(l, r, s, p[14]);
BF_ENC(r, l, s, p[15]);
BF_ENC(l, r, s, p[16]);
# if BF_ROUNDS == 20
BF_ENC(r, l, s, p[17]);
BF_ENC(l, r, s, p[18]);
BF_ENC(r, l, s, p[19]);
BF_ENC(l, r, s, p[20]);
# endif
r ^= p[BF_ROUNDS + 1];
data[1] = l & 0xffffffffL;
data[0] = r & 0xffffffffL;
#else
register BF_LONG l, r, t, *k;
l = data[0];
r = data[1];
k = (BF_LONG *)key;
l ^= k[0];
BF_ENC(r, l, k, 1);
BF_ENC(l, r, k, 2);
BF_ENC(r, l, k, 3);
BF_ENC(l, r, k, 4);
BF_ENC(r, l, k, 5);
BF_ENC(l, r, k, 6);
BF_ENC(r, l, k, 7);
BF_ENC(l, r, k, 8);
BF_ENC(r, l, k, 9);
BF_ENC(l, r, k, 10);
BF_ENC(r, l, k, 11);
BF_ENC(l, r, k, 12);
BF_ENC(r, l, k, 13);
BF_ENC(l, r, k, 14);
BF_ENC(r, l, k, 15);
BF_ENC(l, r, k, 16);
# if BF_ROUNDS == 20
BF_ENC(r, l, k, 17);
BF_ENC(l, r, k, 18);
BF_ENC(r, l, k, 19);
BF_ENC(l, r, k, 20);
# endif
r ^= k[BF_ROUNDS + 1];
data[1] = l & 0xffffffffL;
data[0] = r & 0xffffffffL;
#endif
}
#ifndef BF_DEFAULT_OPTIONS
void BF_decrypt(BF_LONG *data, const BF_KEY *key)
{
# ifndef BF_PTR2
register BF_LONG l, r;
register const BF_LONG *p, *s;
p = key->P;
s = &(key->S[0]);
l = data[0];
r = data[1];
l ^= p[BF_ROUNDS + 1];
# if BF_ROUNDS == 20
BF_ENC(r, l, s, p[20]);
BF_ENC(l, r, s, p[19]);
BF_ENC(r, l, s, p[18]);
BF_ENC(l, r, s, p[17]);
# endif
BF_ENC(r, l, s, p[16]);
BF_ENC(l, r, s, p[15]);
BF_ENC(r, l, s, p[14]);
BF_ENC(l, r, s, p[13]);
BF_ENC(r, l, s, p[12]);
BF_ENC(l, r, s, p[11]);
BF_ENC(r, l, s, p[10]);
BF_ENC(l, r, s, p[9]);
BF_ENC(r, l, s, p[8]);
BF_ENC(l, r, s, p[7]);
BF_ENC(r, l, s, p[6]);
BF_ENC(l, r, s, p[5]);
BF_ENC(r, l, s, p[4]);
BF_ENC(l, r, s, p[3]);
BF_ENC(r, l, s, p[2]);
BF_ENC(l, r, s, p[1]);
r ^= p[0];
data[1] = l & 0xffffffffL;
data[0] = r & 0xffffffffL;
# else
register BF_LONG l, r, t, *k;
l = data[0];
r = data[1];
k = (BF_LONG *)key;
l ^= k[BF_ROUNDS + 1];
# if BF_ROUNDS == 20
BF_ENC(r, l, k, 20);
BF_ENC(l, r, k, 19);
BF_ENC(r, l, k, 18);
BF_ENC(l, r, k, 17);
# endif
BF_ENC(r, l, k, 16);
BF_ENC(l, r, k, 15);
BF_ENC(r, l, k, 14);
BF_ENC(l, r, k, 13);
BF_ENC(r, l, k, 12);
BF_ENC(l, r, k, 11);
BF_ENC(r, l, k, 10);
BF_ENC(l, r, k, 9);
BF_ENC(r, l, k, 8);
BF_ENC(l, r, k, 7);
BF_ENC(r, l, k, 6);
BF_ENC(l, r, k, 5);
BF_ENC(r, l, k, 4);
BF_ENC(l, r, k, 3);
BF_ENC(r, l, k, 2);
BF_ENC(l, r, k, 1);
r ^= k[0];
data[1] = l & 0xffffffffL;
data[0] = r & 0xffffffffL;
# endif
}
void BF_cbc_encrypt(const unsigned char *in, unsigned char *out, long length,
const BF_KEY *schedule, unsigned char *ivec, int encrypt)
{
register BF_LONG tin0, tin1;
register BF_LONG tout0, tout1, xor0, xor1;
register long l = length;
BF_LONG tin[2];
if (encrypt) {
n2l(ivec, tout0);
n2l(ivec, tout1);
ivec -= 8;
for (l -= 8; l >= 0; l -= 8) {
n2l(in, tin0);
n2l(in, tin1);
tin0 ^= tout0;
tin1 ^= tout1;
tin[0] = tin0;
tin[1] = tin1;
BF_encrypt(tin, schedule);
tout0 = tin[0];
tout1 = tin[1];
l2n(tout0, out);
l2n(tout1, out);
}
if (l != -8) {
n2ln(in, tin0, tin1, l + 8);
tin0 ^= tout0;
tin1 ^= tout1;
tin[0] = tin0;
tin[1] = tin1;
BF_encrypt(tin, schedule);
tout0 = tin[0];
tout1 = tin[1];
l2n(tout0, out);
l2n(tout1, out);
}
l2n(tout0, ivec);
l2n(tout1, ivec);
} else {
n2l(ivec, xor0);
n2l(ivec, xor1);
ivec -= 8;
for (l -= 8; l >= 0; l -= 8) {
n2l(in, tin0);
n2l(in, tin1);
tin[0] = tin0;
tin[1] = tin1;
BF_decrypt(tin, schedule);
tout0 = tin[0] ^ xor0;
tout1 = tin[1] ^ xor1;
l2n(tout0, out);
l2n(tout1, out);
xor0 = tin0;
xor1 = tin1;
}
if (l != -8) {
n2l(in, tin0);
n2l(in, tin1);
tin[0] = tin0;
tin[1] = tin1;
BF_decrypt(tin, schedule);
tout0 = tin[0] ^ xor0;
tout1 = tin[1] ^ xor1;
l2nn(tout0, tout1, out, l + 8);
xor0 = tin0;
xor1 = tin1;
}
l2n(xor0, ivec);
l2n(xor1, ivec);
}
tin0 = tin1 = tout0 = tout1 = xor0 = xor1 = 0;
tin[0] = tin[1] = 0;
}
#endif
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