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40 lines
2.2 KiB
C
40 lines
2.2 KiB
C
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/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
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│vi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi│
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╞══════════════════════════════════════════════════════════════════════════════╡
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│ Copyright 2021 Justine Alexandra Roberts Tunney │
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│ │
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│ Permission to use, copy, modify, and/or distribute this software for │
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│ any purpose with or without fee is hereby granted, provided that the │
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│ above copyright notice and this permission notice appear in all copies. │
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│ │
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│ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL │
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│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED │
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│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE │
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│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL │
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│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR │
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│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER │
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│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │
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│ PERFORMANCE OF THIS SOFTWARE. │
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╚─────────────────────────────────────────────────────────────────────────────*/
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#include "third_party/mbedtls/bignum_internal.h"
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#include "third_party/mbedtls/platform.h"
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void ShiftRightPure(mbedtls_mpi_uint *p, size_t n, unsigned char k) {
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mbedtls_mpi_uint x, y, *e, *f;
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MBEDTLS_ASSERT(!(k & ~63));
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f = p;
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if (n) {
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y = 0;
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x = p[0];
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e = p + n;
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for (; ++p < e; x = y) {
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y = p[0];
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p[-1] = x >> 1 | y << (64 - 1);
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}
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p[-1] = x >> 1;
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}
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while (p < f) {
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*p++ = 0;
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}
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}
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