/release/src/router/openssl/crypto/idea/i_cfb64.c
C | 123 lines | 57 code | 4 blank | 62 comment | 8 complexity | 812f6f72ae1ae138c14df45d56b70cd5 MD5 | raw file
- /* crypto/idea/i_cfb64.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"
- /*
- * The input and output encrypted as though 64bit cfb mode is being used.
- * The extra state information to record how much of the 64bit block we have
- * used is contained in *num;
- */
- void idea_cfb64_encrypt(const unsigned char *in, unsigned char *out,
- long length, IDEA_KEY_SCHEDULE *schedule,
- unsigned char *ivec, int *num, int encrypt)
- {
- register unsigned long v0, v1, t;
- register int n = *num;
- register long l = length;
- unsigned long ti[2];
- unsigned char *iv, c, cc;
- iv = (unsigned char *)ivec;
- if (encrypt) {
- while (l--) {
- if (n == 0) {
- n2l(iv, v0);
- ti[0] = v0;
- n2l(iv, v1);
- ti[1] = v1;
- idea_encrypt((unsigned long *)ti, schedule);
- iv = (unsigned char *)ivec;
- t = ti[0];
- l2n(t, iv);
- t = ti[1];
- l2n(t, iv);
- iv = (unsigned char *)ivec;
- }
- c = *(in++) ^ iv[n];
- *(out++) = c;
- iv[n] = c;
- n = (n + 1) & 0x07;
- }
- } else {
- while (l--) {
- if (n == 0) {
- n2l(iv, v0);
- ti[0] = v0;
- n2l(iv, v1);
- ti[1] = v1;
- idea_encrypt((unsigned long *)ti, schedule);
- iv = (unsigned char *)ivec;
- t = ti[0];
- l2n(t, iv);
- t = ti[1];
- l2n(t, iv);
- iv = (unsigned char *)ivec;
- }
- cc = *(in++);
- c = iv[n];
- iv[n] = cc;
- *(out++) = c ^ cc;
- n = (n + 1) & 0x07;
- }
- }
- v0 = v1 = ti[0] = ti[1] = t = c = cc = 0;
- *num = n;
- }