196 lines
6.3 KiB
C
196 lines
6.3 KiB
C
#include "inner.h"
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#include <assert.h>
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/*
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* PRNG and interface to the system RNG.
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*
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* ==========================(LICENSE BEGIN)============================
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*
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* Copyright (c) 2017-2019 Falcon Project
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*
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* Permission is hereby granted, free of charge, to any person obtaining
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* a copy of this software and associated documentation files (the
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* "Software"), to deal in the Software without restriction, including
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* without limitation the rights to use, copy, modify, merge, publish,
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* distribute, sublicense, and/or sell copies of the Software, and to
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* permit persons to whom the Software is furnished to do so, subject to
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* the following conditions:
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*
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* The above copyright notice and this permission notice shall be
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* included in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
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* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
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* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
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* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
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* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*
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* ===========================(LICENSE END)=============================
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*
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* @author Thomas Pornin <thomas.pornin@nccgroup.com>
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*/
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/*
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* Include relevant system header files. For Win32, this will also need
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* linking with advapi32.dll, which we trigger with an appropriate #pragma.
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*/
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/* see inner.h */
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int
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PQCLEAN_FALCON512_AVX2_get_seed(void *seed, size_t len) {
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(void)seed;
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if (len == 0) {
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return 1;
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}
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return 0;
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}
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/* see inner.h */
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void
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PQCLEAN_FALCON512_AVX2_prng_init(prng *p, inner_shake256_context *src) {
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inner_shake256_extract(src, p->state.d, 56);
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PQCLEAN_FALCON512_AVX2_prng_refill(p);
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}
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/*
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* PRNG based on ChaCha20.
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*
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* State consists in key (32 bytes) then IV (16 bytes) and block counter
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* (8 bytes). Normally, we should not care about local endianness (this
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* is for a PRNG), but for the NIST competition we need reproducible KAT
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* vectors that work across architectures, so we enforce little-endian
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* interpretation where applicable. Moreover, output words are "spread
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* out" over the output buffer with the interleaving pattern that is
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* naturally obtained from the AVX2 implementation that runs eight
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* ChaCha20 instances in parallel.
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*
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* The block counter is XORed into the first 8 bytes of the IV.
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*/
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void
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PQCLEAN_FALCON512_AVX2_prng_refill(prng *p) {
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static const uint32_t CW[] = {
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0x61707865, 0x3320646e, 0x79622d32, 0x6b206574
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};
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uint64_t cc;
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size_t u;
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int i;
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uint32_t *sw;
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union {
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uint32_t w[16];
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__m256i y[2]; /* for alignment */
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} t;
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__m256i state[16], init[16];
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sw = (uint32_t *)p->state.d;
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/*
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* XOR next counter values into state.
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*/
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cc = *(uint64_t *)(p->state.d + 48);
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for (u = 0; u < 8; u ++) {
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t.w[u] = (uint32_t)(cc + u);
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t.w[u + 8] = (uint32_t)((cc + u) >> 32);
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}
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*(uint64_t *)(p->state.d + 48) = cc + 8;
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/*
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* Load state.
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*/
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for (u = 0; u < 4; u ++) {
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state[u] = init[u] =
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_mm256_broadcastd_epi32(_mm_cvtsi32_si128((int32_t)CW[u]));
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}
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for (u = 0; u < 10; u ++) {
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state[u + 4] = init[u + 4] =
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_mm256_broadcastd_epi32(_mm_cvtsi32_si128((int32_t)sw[u]));
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}
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state[14] = init[14] = _mm256_xor_si256(
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_mm256_broadcastd_epi32(_mm_cvtsi32_si128((int32_t)sw[10])),
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_mm256_loadu_si256((__m256i *)&t.w[0]));
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state[15] = init[15] = _mm256_xor_si256(
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_mm256_broadcastd_epi32(_mm_cvtsi32_si128((int32_t)sw[11])),
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_mm256_loadu_si256((__m256i *)&t.w[8]));
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/*
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* Do all rounds.
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*/
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for (i = 0; i < 10; i ++) {
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#define QROUND(a, b, c, d) do { \
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state[a] = _mm256_add_epi32(state[a], state[b]); \
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state[d] = _mm256_xor_si256(state[d], state[a]); \
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state[d] = _mm256_or_si256( \
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_mm256_slli_epi32(state[d], 16), \
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_mm256_srli_epi32(state[d], 16)); \
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state[c] = _mm256_add_epi32(state[c], state[d]); \
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state[b] = _mm256_xor_si256(state[b], state[c]); \
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state[b] = _mm256_or_si256( \
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_mm256_slli_epi32(state[b], 12), \
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_mm256_srli_epi32(state[b], 20)); \
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state[a] = _mm256_add_epi32(state[a], state[b]); \
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state[d] = _mm256_xor_si256(state[d], state[a]); \
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state[d] = _mm256_or_si256( \
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_mm256_slli_epi32(state[d], 8), \
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_mm256_srli_epi32(state[d], 24)); \
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state[c] = _mm256_add_epi32(state[c], state[d]); \
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state[b] = _mm256_xor_si256(state[b], state[c]); \
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state[b] = _mm256_or_si256( \
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_mm256_slli_epi32(state[b], 7), \
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_mm256_srli_epi32(state[b], 25)); \
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} while (0)
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QROUND( 0, 4, 8, 12);
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QROUND( 1, 5, 9, 13);
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QROUND( 2, 6, 10, 14);
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QROUND( 3, 7, 11, 15);
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QROUND( 0, 5, 10, 15);
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QROUND( 1, 6, 11, 12);
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QROUND( 2, 7, 8, 13);
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QROUND( 3, 4, 9, 14);
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#undef QROUND
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}
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/*
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* Add initial state back and encode the result in the destination
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* buffer. We can dump the AVX2 values "as is" because the non-AVX2
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* code uses a compatible order of values.
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*/
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for (u = 0; u < 16; u ++) {
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_mm256_storeu_si256((__m256i *)&p->buf.d[u << 5],
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_mm256_add_epi32(state[u], init[u]));
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}
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p->ptr = 0;
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}
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/* see inner.h */
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void
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PQCLEAN_FALCON512_AVX2_prng_get_bytes(prng *p, void *dst, size_t len) {
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uint8_t *buf;
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buf = dst;
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while (len > 0) {
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size_t clen;
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clen = (sizeof p->buf.d) - p->ptr;
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if (clen > len) {
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clen = len;
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}
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memcpy(buf, p->buf.d, clen);
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buf += clen;
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len -= clen;
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p->ptr += clen;
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if (p->ptr == sizeof p->buf.d) {
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PQCLEAN_FALCON512_AVX2_prng_refill(p);
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}
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}
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}
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