Coverage Report

Created: 2022-11-30 06:20

/src/openssl/crypto/cast/c_cfb64.c
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/* crypto/cast/c_cfb64.c */
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/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
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 * All rights reserved.
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 *
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 * This package is an SSL implementation written
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 * by Eric Young (eay@cryptsoft.com).
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 * The implementation was written so as to conform with Netscapes SSL.
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 *
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 * This library is free for commercial and non-commercial use as long as
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 * the following conditions are aheared to.  The following conditions
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 * apply to all code found in this distribution, be it the RC4, RSA,
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 * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
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 * included with this distribution is covered by the same copyright terms
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 * except that the holder is Tim Hudson (tjh@cryptsoft.com).
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 *
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 * Copyright remains Eric Young's, and as such any Copyright notices in
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 * the code are not to be removed.
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 * If this package is used in a product, Eric Young should be given attribution
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 * as the author of the parts of the library used.
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 * This can be in the form of a textual message at program startup or
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 * in documentation (online or textual) provided with the package.
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 *
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 * Redistribution and use in source and binary forms, with or without
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 * modification, are permitted provided that the following conditions
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 * are met:
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 * 1. Redistributions of source code must retain the copyright
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 *    notice, this list of conditions and the following disclaimer.
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 * 2. Redistributions in binary form must reproduce the above copyright
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 *    notice, this list of conditions and the following disclaimer in the
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 *    documentation and/or other materials provided with the distribution.
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 * 3. All advertising materials mentioning features or use of this software
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 *    must display the following acknowledgement:
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 *    "This product includes cryptographic software written by
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 *     Eric Young (eay@cryptsoft.com)"
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 *    The word 'cryptographic' can be left out if the rouines from the library
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 *    being used are not cryptographic related :-).
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 * 4. If you include any Windows specific code (or a derivative thereof) from
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 *    the apps directory (application code) you must include an acknowledgement:
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 *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
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 *
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 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
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 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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 * SUCH DAMAGE.
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 *
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 * The licence and distribution terms for any publically available version or
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 * derivative of this code cannot be changed.  i.e. this code cannot simply be
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 * copied and put under another distribution licence
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 * [including the GNU Public Licence.]
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 */
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#include <openssl/cast.h>
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#include "cast_lcl.h"
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/*
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 * The input and output encrypted as though 64bit cfb mode is being used.
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 * The extra state information to record how much of the 64bit block we have
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 * used is contained in *num;
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 */
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void CAST_cfb64_encrypt(const unsigned char *in, unsigned char *out,
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                        long length, const CAST_KEY *schedule,
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                        unsigned char *ivec, int *num, int enc)
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0
{
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0
    register CAST_LONG v0, v1, t;
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    register int n = *num;
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    register long l = length;
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    CAST_LONG ti[2];
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    unsigned char *iv, c, cc;
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    iv = ivec;
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    if (enc) {
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0
        while (l--) {
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0
            if (n == 0) {
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                n2l(iv, v0);
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                ti[0] = v0;
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                n2l(iv, v1);
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                ti[1] = v1;
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                CAST_encrypt((CAST_LONG *)ti, schedule);
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                iv = ivec;
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                t = ti[0];
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                l2n(t, iv);
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                t = ti[1];
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                l2n(t, iv);
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                iv = ivec;
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            }
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            c = *(in++) ^ iv[n];
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            *(out++) = c;
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            iv[n] = c;
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            n = (n + 1) & 0x07;
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        }
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    } else {
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        while (l--) {
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            if (n == 0) {
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                n2l(iv, v0);
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                ti[0] = v0;
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                n2l(iv, v1);
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                ti[1] = v1;
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                CAST_encrypt((CAST_LONG *)ti, schedule);
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                iv = ivec;
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                t = ti[0];
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                l2n(t, iv);
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                t = ti[1];
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                l2n(t, iv);
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                iv = ivec;
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            }
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            cc = *(in++);
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            c = iv[n];
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            iv[n] = cc;
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            *(out++) = c ^ cc;
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            n = (n + 1) & 0x07;
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        }
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    }
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    v0 = v1 = ti[0] = ti[1] = t = c = cc = 0;
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    *num = n;
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0
}