ttimingsafe_bcmp.c - sick - sign and check files using ed25519
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       ttimingsafe_bcmp.c (1000B)
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            1 /* Copyright (c) 2010 Damien Miller.  All rights reserved.
            2  *
            3  * Permission to use, copy, modify, and distribute this software for any
            4  * purpose with or without fee is hereby granted, provided that the above
            5  * copyright notice and this permission notice appear in all copies.
            6  *
            7  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
            8  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
            9  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
           10  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
           11  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
           12  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
           13  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
           14  */
           15 
           16 #include <string.h>
           17 
           18 int
           19 timingsafe_bcmp(const void *b1, const void *b2, size_t n)
           20 {
           21         const unsigned char *p1 = b1, *p2 = b2;
           22         int ret = 0;
           23 
           24         for (; n > 0; n--)
           25                 ret |= *p1++ ^ *p2++;
           26         return (ret != 0);
           27 }