b19633f9b9
This helps to avoid timing attacks. Signed-off-by: Joseph Sutton <josephsutton@catalyst.net.nz>
79 lines
2.4 KiB
C
79 lines
2.4 KiB
C
/*
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* Copyright (c) 1995 - 2000 Kungliga Tekniska Högskolan
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* (Royal Institute of Technology, Stockholm, Sweden).
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* All rights reserved.
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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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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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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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*
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* 3. Neither the name of the Institute nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``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 INSTITUTE 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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#ifdef HAVE_CONFIG_H
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#include "config.h"
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RCSID("$Id$");
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#endif
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#include "otp_locl.h"
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int
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otp_verify_user_1 (OtpContext *ctx, const char *passwd)
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{
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OtpKey key1, key2;
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if (otp_parse (key1, passwd, ctx->alg)) {
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ctx->err = "Syntax error in reply";
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return -1;
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}
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memcpy (key2, key1, sizeof(key1));
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ctx->alg->next (key2);
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if (ct_memcmp (ctx->key, key2, sizeof(key2)) == 0) {
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--ctx->n;
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memcpy (ctx->key, key1, sizeof(key1));
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return 0;
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} else
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return -1;
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}
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int
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otp_verify_user (OtpContext *ctx, const char *passwd)
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{
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void *dbm;
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int ret;
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if (!ctx->challengep)
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return -1;
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ret = otp_verify_user_1 (ctx, passwd);
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dbm = otp_db_open ();
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if (dbm == NULL) {
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free(ctx->user);
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return -1;
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}
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otp_put (dbm, ctx);
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free(ctx->user);
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otp_db_close (dbm);
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return ret;
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}
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