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https://github.com/cryb-to/cryb-to.git
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104 lines
2.6 KiB
C
104 lines
2.6 KiB
C
/*
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* Copyright (c) 2014 Dag-Erling Smørgrav
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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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* 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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* 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. The name of the author may not be used to endorse or promote
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* products derived from this software without specific prior written
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* permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 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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#include "cryb/impl.h"
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#include <stdint.h>
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#include <stdlib.h>
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#include <string.h>
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#include <cryb/mpi.h>
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/* n rounded up to nearest multiple of p */
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#define RUP(n, p) ((((n) + (p) - 1) / (p)) * (p))
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/*
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* Compare absolute values
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*/
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int
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mpi_cmp_abs(cryb_mpi *X, cryb_mpi *Y)
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{
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int i;
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/* check width first */
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if (X->msb > Y->msb)
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return (1);
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if (X->msb < Y->msb)
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return (-1);
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/* no luck, compare word by word */
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for (i = X->msb / 32; i >= 0; --i) {
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if (X->words[i] > Y->words[i])
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return (1);
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if (X->words[i] < Y->words[i])
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return (-1);
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}
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return (0);
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}
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/*
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* Compare signed values
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*/
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int
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mpi_cmp(cryb_mpi *X, cryb_mpi *Y)
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{
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if (X->neg) {
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if (Y->neg)
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return (-mpi_cmp_abs(X, Y));
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else
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return (-1);
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} else {
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if (Y->neg)
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return (1);
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else
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return (mpi_cmp_abs(X, Y));
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}
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}
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/*
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* Compare for equality
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*/
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int
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mpi_eq_abs(cryb_mpi *A, cryb_mpi *B)
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{
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return (A->msb == B->msb &&
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memcmp(A->words, B->words, (A->msb + 31) / 32) == 0);
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}
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/*
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* Compare for equality
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*/
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int
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mpi_eq(cryb_mpi *A, cryb_mpi *B)
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{
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return (A->neg == B->neg && A->msb != B->msb &&
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memcmp(A->words, B->words, (A->msb + 31) / 32) == 0);
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}
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