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📁 ..
📄 i15_add.c(1.45 KB)
📄 i15_bitlen.c(1.42 KB)
📄 i15_decmod.c(3.45 KB)
📄 i15_decode.c(1.59 KB)
📄 i15_decred.c(2.52 KB)
📄 i15_encode.c(1.6 KB)
📄 i15_fmont.c(1.86 KB)
📄 i15_iszero.c(1.32 KB)
📄 i15_moddiv.c(12.25 KB)
📄 i15_modpow.c(1.68 KB)
📄 i15_modpow2.c(4.06 KB)
📄 i15_montmul.c(7.28 KB)
📄 i15_mulacc.c(1.85 KB)
📄 i15_muladd.c(4.57 KB)
📄 i15_ninv15.c(1.35 KB)
📄 i15_reduce.c(1.98 KB)
📄 i15_rshift.c(1.44 KB)
📄 i15_sub.c(1.45 KB)
📄 i15_tmont.c(1.3 KB)
📄 i31_add.c(1.47 KB)
📄 i31_bitlen.c(1.42 KB)
📄 i31_decmod.c(3.46 KB)
📄 i31_decode.c(1.63 KB)
📄 i31_decred.c(2.57 KB)
📄 i31_encode.c(1.99 KB)
📄 i31_fmont.c(1.88 KB)
📄 i31_iszero.c(1.32 KB)
📄 i31_moddiv.c(12.91 KB)
📄 i31_modpow.c(2.11 KB)
📄 i31_modpow2.c(4.06 KB)
📄 i31_montmul.c(3.75 KB)
📄 i31_mulacc.c(2.24 KB)
📄 i31_muladd.c(4.51 KB)
📄 i31_ninv31.c(1.33 KB)
📄 i31_reduce.c(1.98 KB)
📄 i31_rshift.c(1.45 KB)
📄 i31_sub.c(1.46 KB)
📄 i31_tmont.c(1.3 KB)
📄 i32_add.c(1.57 KB)
📄 i32_bitlen.c(1.42 KB)
📄 i32_decmod.c(2.2 KB)
📄 i32_decode.c(1.68 KB)
📄 i32_decred.c(2.67 KB)
📄 i32_div32.c(1.66 KB)
📄 i32_encode.c(1.88 KB)
📄 i32_fmont.c(1.86 KB)
📄 i32_iszero.c(1.32 KB)
📄 i32_modpow.c(2.11 KB)
📄 i32_montmul.c(1.98 KB)
📄 i32_mulacc.c(1.65 KB)
📄 i32_muladd.c(4.06 KB)
📄 i32_ninv32.c(1.31 KB)
📄 i32_reduce.c(1.98 KB)
📄 i32_sub.c(1.57 KB)
📄 i32_tmont.c(1.3 KB)
📄 i62_modpow2.c(12.71 KB)

Editing: i32_decmod.c

/*
 * Copyright (c) 2016 Thomas Pornin <pornin@bolet.org>
 *
 * Permission is hereby granted, free of charge, to any person obtaining 
 * a copy of this software and associated documentation files (the
 * "Software"), to deal in the Software without restriction, including
 * without limitation the rights to use, copy, modify, merge, publish,
 * distribute, sublicense, and/or sell copies of the Software, and to
 * permit persons to whom the Software is furnished to do so, subject to
 * the following conditions:
 *
 * The above copyright notice and this permission notice shall be 
 * included in all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, 
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND 
 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */

#include "inner.h"

/* see inner.h */
uint32_t
br_i32_decode_mod(uint32_t *x, const void *src, size_t len, const uint32_t *m)
{
	const unsigned char *buf;
	uint32_t r;
	size_t u, v, mlen;

buf = src;

/*
	 * First pass: determine whether the value fits. The 'r' value
	 * will contain the comparison result, as 0x00000000 (value is
	 * equal to the modulus), 0x00000001 (value is greater than the
	 * modulus), or 0xFFFFFFFF (value is lower than the modulus).
	 */
	mlen = (m[0] + 7) >> 3;
	r = 0;
	for (u = (mlen > len) ? mlen : len; u > 0; u --) {
		uint32_t mb, xb;

v = u - 1;
		if (v >= mlen) {
			mb = 0;
		} else {
			mb = (m[1 + (v >> 2)] >> ((v & 3) << 3)) & 0xFF;
		}
		if (v >= len) {
			xb = 0;
		} else {
			xb = buf[len - u];
		}
		r = MUX(EQ(r, 0), (uint32_t)CMP(xb, mb), r);
	}

/*
	 * Only r == 0xFFFFFFFF is acceptable. We want to set r to 0xFF if
	 * the value fits, 0x00 otherwise.
	 */
	r >>= 24;
	br_i32_zero(x, m[0]);
	u = (mlen > len) ? len : mlen;
	while (u > 0) {
		uint32_t xb;

xb = buf[len - u] & r;
		u --;
		x[1 + (u >> 2)] |= xb << ((u & 3) << 3);
	}
	return r >> 7;
}

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Editing: i32_decmod.c

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