source-engine/thirdparty/openssl/crypto/idea/i_cbc.c

/* crypto/idea/i_cbc.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/idea.h>
#include "idea_lcl.h"

void idea_cbc_encrypt(const unsigned char *in, unsigned char *out,
                      long length, IDEA_KEY_SCHEDULE *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) {
        n2l(iv, tout0);
        n2l(iv, tout1);
        iv -= 8;
        for (l -= 8; l >= 0; l -= 8) {
            n2l(in, tin0);
            n2l(in, tin1);
            tin0 ^= tout0;
            tin1 ^= tout1;
            tin[0] = tin0;
            tin[1] = tin1;
            idea_encrypt(tin, ks);
            tout0 = tin[0];
            l2n(tout0, out);
            tout1 = tin[1];
            l2n(tout1, out);
        }
        if (l != -8) {
            n2ln(in, tin0, tin1, l + 8);
            tin0 ^= tout0;
            tin1 ^= tout1;
            tin[0] = tin0;
            tin[1] = tin1;
            idea_encrypt(tin, ks);
            tout0 = tin[0];
            l2n(tout0, out);
            tout1 = tin[1];
            l2n(tout1, out);
        }
        l2n(tout0, iv);
        l2n(tout1, iv);
    } else {
        n2l(iv, xor0);
        n2l(iv, xor1);
        iv -= 8;
        for (l -= 8; l >= 0; l -= 8) {
            n2l(in, tin0);
            tin[0] = tin0;
            n2l(in, tin1);
            tin[1] = tin1;
            idea_encrypt(tin, ks);
            tout0 = tin[0] ^ xor0;
            tout1 = tin[1] ^ xor1;
            l2n(tout0, out);
            l2n(tout1, out);
            xor0 = tin0;
            xor1 = tin1;
        }
        if (l != -8) {
            n2l(in, tin0);
            tin[0] = tin0;
            n2l(in, tin1);
            tin[1] = tin1;
            idea_encrypt(tin, ks);
            tout0 = tin[0] ^ xor0;
            tout1 = tin[1] ^ xor1;
            l2nn(tout0, tout1, out, l + 8);
            xor0 = tin0;
            xor1 = tin1;
        }
        l2n(xor0, iv);
        l2n(xor1, iv);
    }
    tin0 = tin1 = tout0 = tout1 = xor0 = xor1 = 0;
    tin[0] = tin[1] = 0;
}

void idea_encrypt(unsigned long *d, IDEA_KEY_SCHEDULE *key)
{
    register IDEA_INT *p;
    register unsigned long x1, x2, x3, x4, t0, t1, ul;

    x2 = d[0];
    x1 = (x2 >> 16);
    x4 = d[1];
    x3 = (x4 >> 16);

    p = &(key->data[0][0]);

    E_IDEA(0);
    E_IDEA(1);
    E_IDEA(2);
    E_IDEA(3);
    E_IDEA(4);
    E_IDEA(5);
    E_IDEA(6);
    E_IDEA(7);

    x1 &= 0xffff;
    idea_mul(x1, x1, *p, ul);
    p++;

    t0 = x3 + *(p++);
    t1 = x2 + *(p++);

    x4 &= 0xffff;
    idea_mul(x4, x4, *p, ul);

    d[0] = (t0 & 0xffff) | ((x1 & 0xffff) << 16);
    d[1] = (x4 & 0xffff) | ((t1 & 0xffff) << 16);
}