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godot/drivers/builtin_openssl2/crypto/rc5/rc5_enc.c

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/* crypto/rc5/rc5_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 <stdio.h>
#include <openssl/rc5.h>
#include "rc5_locl.h"
void RC5_32_cbc_encrypt(const unsigned char *in, unsigned char *out,
long length, RC5_32_KEY *ks, unsigned char *iv,
int encrypt)
{
register unsigned long tin0, tin1;
register unsigned long tout0, tout1, xor0, xor1;
register long l = length;
unsigned long tin[2];
if (encrypt) {
c2l(iv, tout0);
c2l(iv, tout1);
iv -= 8;
for (l -= 8; l >= 0; l -= 8) {
c2l(in, tin0);
c2l(in, tin1);
tin0 ^= tout0;
tin1 ^= tout1;
tin[0] = tin0;
tin[1] = tin1;
RC5_32_encrypt(tin, ks);
tout0 = tin[0];
l2c(tout0, out);
tout1 = tin[1];
l2c(tout1, out);
}
if (l != -8) {
c2ln(in, tin0, tin1, l + 8);
tin0 ^= tout0;
tin1 ^= tout1;
tin[0] = tin0;
tin[1] = tin1;
RC5_32_encrypt(tin, ks);
tout0 = tin[0];
l2c(tout0, out);
tout1 = tin[1];
l2c(tout1, out);
}
l2c(tout0, iv);
l2c(tout1, iv);
} else {
c2l(iv, xor0);
c2l(iv, xor1);
iv -= 8;
for (l -= 8; l >= 0; l -= 8) {
c2l(in, tin0);
tin[0] = tin0;
c2l(in, tin1);
tin[1] = tin1;
RC5_32_decrypt(tin, ks);
tout0 = tin[0] ^ xor0;
tout1 = tin[1] ^ xor1;
l2c(tout0, out);
l2c(tout1, out);
xor0 = tin0;
xor1 = tin1;
}
if (l != -8) {
c2l(in, tin0);
tin[0] = tin0;
c2l(in, tin1);
tin[1] = tin1;
RC5_32_decrypt(tin, ks);
tout0 = tin[0] ^ xor0;
tout1 = tin[1] ^ xor1;
l2cn(tout0, tout1, out, l + 8);
xor0 = tin0;
xor1 = tin1;
}
l2c(xor0, iv);
l2c(xor1, iv);
}
tin0 = tin1 = tout0 = tout1 = xor0 = xor1 = 0;
tin[0] = tin[1] = 0;
}
void RC5_32_encrypt(unsigned long *d, RC5_32_KEY *key)
{
RC5_32_INT a, b, *s;
s = key->data;
a = d[0] + s[0];
b = d[1] + s[1];
E_RC5_32(a, b, s, 2);
E_RC5_32(a, b, s, 4);
E_RC5_32(a, b, s, 6);
E_RC5_32(a, b, s, 8);
E_RC5_32(a, b, s, 10);
E_RC5_32(a, b, s, 12);
E_RC5_32(a, b, s, 14);
E_RC5_32(a, b, s, 16);
if (key->rounds == 12) {
E_RC5_32(a, b, s, 18);
E_RC5_32(a, b, s, 20);
E_RC5_32(a, b, s, 22);
E_RC5_32(a, b, s, 24);
} else if (key->rounds == 16) {
/* Do a full expansion to avoid a jump */
E_RC5_32(a, b, s, 18);
E_RC5_32(a, b, s, 20);
E_RC5_32(a, b, s, 22);
E_RC5_32(a, b, s, 24);
E_RC5_32(a, b, s, 26);
E_RC5_32(a, b, s, 28);
E_RC5_32(a, b, s, 30);
E_RC5_32(a, b, s, 32);
}
d[0] = a;
d[1] = b;
}
void RC5_32_decrypt(unsigned long *d, RC5_32_KEY *key)
{
RC5_32_INT a, b, *s;
s = key->data;
a = d[0];
b = d[1];
if (key->rounds == 16) {
D_RC5_32(a, b, s, 32);
D_RC5_32(a, b, s, 30);
D_RC5_32(a, b, s, 28);
D_RC5_32(a, b, s, 26);
/* Do a full expansion to avoid a jump */
D_RC5_32(a, b, s, 24);
D_RC5_32(a, b, s, 22);
D_RC5_32(a, b, s, 20);
D_RC5_32(a, b, s, 18);
} else if (key->rounds == 12) {
D_RC5_32(a, b, s, 24);
D_RC5_32(a, b, s, 22);
D_RC5_32(a, b, s, 20);
D_RC5_32(a, b, s, 18);
}
D_RC5_32(a, b, s, 16);
D_RC5_32(a, b, s, 14);
D_RC5_32(a, b, s, 12);
D_RC5_32(a, b, s, 10);
D_RC5_32(a, b, s, 8);
D_RC5_32(a, b, s, 6);
D_RC5_32(a, b, s, 4);
D_RC5_32(a, b, s, 2);
d[0] = a - s[0];
d[1] = b - s[1];
}
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