mirror of
https://github.com/henrydcase/pqc.git
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434 lines
15 KiB
C
434 lines
15 KiB
C
#include <stdint.h>
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#include <string.h>
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#include "fips202.h"
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#include "packing.h"
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#include "params.h"
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#include "poly.h"
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#include "polyvec.h"
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#include "randombytes.h"
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#include "sign.h"
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#include "symmetric.h"
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/*************************************************
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* Name: expand_mat
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*
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* Description: Implementation of ExpandA. Generates matrix A with uniformly
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* random coefficients a_{i,j} by performing rejection
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* sampling on the output stream of SHAKE128(rho|i|j).
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*
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* Arguments: - polyvecl mat[K]: output matrix
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* - const uint8_t rho[]: byte array containing seed rho
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**************************************************/
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void PQCLEAN_DILITHIUM2_AVX2_expand_mat(polyvecl mat[4], const uint8_t rho[SEEDBYTES]) {
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PQCLEAN_DILITHIUM2_AVX2_poly_uniform_4x(&mat[0].vec[0],
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&mat[0].vec[1],
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&mat[0].vec[2],
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&mat[1].vec[0],
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rho, 0, 1, 2, 256);
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PQCLEAN_DILITHIUM2_AVX2_poly_uniform_4x(&mat[1].vec[1],
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&mat[1].vec[2],
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&mat[2].vec[0],
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&mat[2].vec[1],
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rho, 257, 258, 512, 513);
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PQCLEAN_DILITHIUM2_AVX2_poly_uniform_4x(&mat[2].vec[2],
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&mat[3].vec[0],
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&mat[3].vec[1],
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&mat[3].vec[2],
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rho, 514, 768, 769, 770);
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}
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/*************************************************
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* Name: PQCLEAN_DILITHIUM2_AVX2_challenge
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*
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* Description: Implementation of H. Samples polynomial with 60 nonzero
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* coefficients in {-1,1} using the output stream of
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* SHAKE256(mu|w1).
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*
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* Arguments: - poly *c: pointer to output polynomial
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* - const uint8_t mu[]: byte array containing mu
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* - const polyveck *w1: pointer to vector w1
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**************************************************/
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void PQCLEAN_DILITHIUM2_AVX2_challenge(poly *c,
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const uint8_t mu[CRHBYTES],
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const polyveck *w1) {
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uint8_t b;
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size_t pos;
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uint64_t signs;
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uint8_t inbuf[CRHBYTES + K * POLW1_SIZE_PACKED];
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uint8_t outbuf[SHAKE256_RATE];
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shake256ctx state;
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for (size_t i = 0; i < CRHBYTES; ++i) {
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inbuf[i] = mu[i];
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}
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for (size_t i = 0; i < K; ++i) {
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PQCLEAN_DILITHIUM2_AVX2_polyw1_pack(inbuf + CRHBYTES + i * POLW1_SIZE_PACKED, &w1->vec[i]);
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}
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shake256_absorb(&state, inbuf, sizeof(inbuf));
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shake256_squeezeblocks(outbuf, 1, &state);
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signs = 0;
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for (size_t i = 0; i < 8; ++i) {
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signs |= (uint64_t) outbuf[i] << 8 * i;
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}
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pos = 8;
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for (size_t i = 0; i < N; ++i) {
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c->coeffs[i] = 0;
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}
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for (size_t i = 196; i < 256; ++i) {
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do {
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if (pos >= SHAKE256_RATE) {
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shake256_squeezeblocks(outbuf, 1, &state);
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pos = 0;
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}
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b = outbuf[pos++];
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} while (b > i);
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c->coeffs[i] = c->coeffs[b];
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c->coeffs[b] = 1;
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c->coeffs[b] ^= -(signs & 1) & (1 ^ (Q - 1));
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signs >>= 1;
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}
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shake256_ctx_release(&state);
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}
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/*************************************************
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* Name: PQCLEAN_DILITHIUM2_AVX2_crypto_sign_keypair
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*
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* Description: Generates public and private key.
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*
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* Arguments: - uint8_t *pk: pointer to output public key (allocated
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* array of PQCLEAN_DILITHIUM2_AVX2_CRYPTO_PUBLICKEYBYTES bytes)
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* - uint8_t *sk: pointer to output private key (allocated
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* array of PQCLEAN_DILITHIUM2_AVX2_CRYPTO_SECRETKEYBYTES bytes)
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*
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* Returns 0 (success)
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**************************************************/
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int PQCLEAN_DILITHIUM2_AVX2_crypto_sign_keypair(uint8_t *pk, uint8_t *sk) {
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uint8_t seedbuf[3 * SEEDBYTES];
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uint8_t tr[CRHBYTES];
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const uint8_t *rho, *rhoprime, *key;
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uint16_t nonce = 0;
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polyvecl mat[K];
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polyvecl s1, s1hat;
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polyveck s2, t, t1, t0;
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/* Expand 32 bytes of randomness into rho, rhoprime and key */
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randombytes(seedbuf, 3 * SEEDBYTES);
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rho = seedbuf;
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rhoprime = seedbuf + SEEDBYTES;
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key = seedbuf + 2 * SEEDBYTES;
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/* Expand matrix */
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PQCLEAN_DILITHIUM2_AVX2_expand_mat(mat, rho);
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/* Sample short vectors s1 and s2 */
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PQCLEAN_DILITHIUM2_AVX2_poly_uniform_eta_4x(&s1.vec[0], &s1.vec[1], &s1.vec[2], &s2.vec[0], rhoprime,
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nonce, nonce + 1, nonce + 2, nonce + 3);
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PQCLEAN_DILITHIUM2_AVX2_poly_uniform_eta_4x(&s2.vec[1], &s2.vec[2], &s2.vec[3], &t.vec[0], rhoprime,
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nonce + 4, nonce + 5, nonce + 6, 0);
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/* Matrix-vector multiplication */
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s1hat = s1;
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PQCLEAN_DILITHIUM2_AVX2_polyvecl_ntt(&s1hat);
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for (size_t i = 0; i < K; ++i) {
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PQCLEAN_DILITHIUM2_AVX2_polyvecl_pointwise_acc_invmontgomery(&t.vec[i], &mat[i], &s1hat);
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//PQCLEAN_DILITHIUM2_AVX2_poly_reduce(&t.vec[i]);
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PQCLEAN_DILITHIUM2_AVX2_poly_invntt_montgomery(&t.vec[i]);
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}
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/* Add error vector s2 */
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PQCLEAN_DILITHIUM2_AVX2_polyveck_add(&t, &t, &s2);
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/* Extract t1 and write public key */
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PQCLEAN_DILITHIUM2_AVX2_polyveck_freeze(&t);
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PQCLEAN_DILITHIUM2_AVX2_polyveck_power2round(&t1, &t0, &t);
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PQCLEAN_DILITHIUM2_AVX2_pack_pk(pk, rho, &t1);
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/* Compute CRH(rho, t1) and write secret key */
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crh(tr, pk, PQCLEAN_DILITHIUM2_AVX2_CRYPTO_PUBLICKEYBYTES);
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PQCLEAN_DILITHIUM2_AVX2_pack_sk(sk, rho, key, tr, &s1, &s2, &t0);
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return 0;
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}
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/*************************************************
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* Name: PQCLEAN_DILITHIUM2_AVX2_crypto_sign_signature
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*
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* Description: Compute signed message.
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*
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* Arguments: - uint8_t *sig: pointer to output signature (PQCLEAN_DILITHIUM2_AVX2_CRYPTO_BYTES
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* of len)
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* - size_t *siglen: pointer to output length of signed message
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* (should be PQCLEAN_DILITHIUM2_AVX2_CRYPTO_BYTES)
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* - uint8_t *m: pointer to message to be signed
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* - size_t mlen: length of message
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* - uint8_t *sk: pointer to bit-packed secret key
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*
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* Returns 0 (success)
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**************************************************/
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int PQCLEAN_DILITHIUM2_AVX2_crypto_sign_signature(
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uint8_t *sig, size_t *siglen,
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const uint8_t *m, size_t mlen,
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const uint8_t *sk) {
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uint32_t n;
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uint8_t seedbuf[2 * SEEDBYTES + 3 * CRHBYTES];
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uint8_t *rho, *tr, *key, *mu, *rhoprime;
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uint16_t nonce = 0;
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poly c, chat;
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polyvecl mat[K], s1, y, yhat, z;
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polyveck t0, s2, w, w1, w0;
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polyveck h, cs2, ct0;
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rho = seedbuf;
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tr = rho + SEEDBYTES;
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key = tr + CRHBYTES;
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mu = key + SEEDBYTES;
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rhoprime = mu + CRHBYTES;
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PQCLEAN_DILITHIUM2_AVX2_unpack_sk(rho, key, tr, &s1, &s2, &t0, sk);
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// use incremental hash API instead of copying around buffers
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/* Compute CRH(tr, m) */
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shake256incctx state;
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shake256_inc_init(&state);
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shake256_inc_absorb(&state, tr, CRHBYTES);
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shake256_inc_absorb(&state, m, mlen);
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shake256_inc_finalize(&state);
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shake256_inc_squeeze(mu, CRHBYTES, &state);
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shake256_inc_ctx_release(&state);
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crh(rhoprime, key, SEEDBYTES + CRHBYTES);
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/* Expand matrix and transform vectors */
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PQCLEAN_DILITHIUM2_AVX2_expand_mat(mat, rho);
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PQCLEAN_DILITHIUM2_AVX2_polyvecl_ntt(&s1);
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PQCLEAN_DILITHIUM2_AVX2_polyveck_ntt(&s2);
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PQCLEAN_DILITHIUM2_AVX2_polyveck_ntt(&t0);
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rej:
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/* Sample intermediate vector y */
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PQCLEAN_DILITHIUM2_AVX2_poly_uniform_gamma1m1_4x(&y.vec[0], &y.vec[1], &y.vec[2], &yhat.vec[0],
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rhoprime, nonce, nonce + 1, nonce + 2, 0);
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nonce += 3;
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/* Matrix-vector multiplication */
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yhat = y;
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PQCLEAN_DILITHIUM2_AVX2_polyvecl_ntt(&yhat);
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for (size_t i = 0; i < K; ++i) {
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PQCLEAN_DILITHIUM2_AVX2_polyvecl_pointwise_acc_invmontgomery(&w.vec[i], &mat[i], &yhat);
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PQCLEAN_DILITHIUM2_AVX2_poly_reduce(&w.vec[i]);
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PQCLEAN_DILITHIUM2_AVX2_poly_invntt_montgomery(&w.vec[i]);
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}
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/* Decompose w and call the random oracle */
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PQCLEAN_DILITHIUM2_AVX2_polyveck_csubq(&w);
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PQCLEAN_DILITHIUM2_AVX2_polyveck_decompose(&w1, &w0, &w);
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PQCLEAN_DILITHIUM2_AVX2_challenge(&c, mu, &w1);
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chat = c;
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PQCLEAN_DILITHIUM2_AVX2_poly_ntt(&chat);
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/* Check that subtracting cs2 does not change high bits of w and low bits
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* do not reveal secret information */
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for (size_t i = 0; i < K; ++i) {
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PQCLEAN_DILITHIUM2_AVX2_poly_pointwise_invmontgomery(&cs2.vec[i], &chat, &s2.vec[i]);
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PQCLEAN_DILITHIUM2_AVX2_poly_invntt_montgomery(&cs2.vec[i]);
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}
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PQCLEAN_DILITHIUM2_AVX2_polyveck_sub(&w0, &w0, &cs2);
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PQCLEAN_DILITHIUM2_AVX2_polyveck_freeze(&w0);
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if (PQCLEAN_DILITHIUM2_AVX2_polyveck_chknorm(&w0, GAMMA2 - BETA)) {
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goto rej;
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}
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/* Compute z, reject if it reveals secret */
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for (size_t i = 0; i < L; ++i) {
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PQCLEAN_DILITHIUM2_AVX2_poly_pointwise_invmontgomery(&z.vec[i], &chat, &s1.vec[i]);
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PQCLEAN_DILITHIUM2_AVX2_poly_invntt_montgomery(&z.vec[i]);
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}
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PQCLEAN_DILITHIUM2_AVX2_polyvecl_add(&z, &z, &y);
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PQCLEAN_DILITHIUM2_AVX2_polyvecl_freeze(&z);
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if (PQCLEAN_DILITHIUM2_AVX2_polyvecl_chknorm(&z, GAMMA1 - BETA)) {
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goto rej;
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}
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/* Compute hints for w1 */
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for (size_t i = 0; i < K; ++i) {
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PQCLEAN_DILITHIUM2_AVX2_poly_pointwise_invmontgomery(&ct0.vec[i], &chat, &t0.vec[i]);
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PQCLEAN_DILITHIUM2_AVX2_poly_invntt_montgomery(&ct0.vec[i]);
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}
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PQCLEAN_DILITHIUM2_AVX2_polyveck_csubq(&ct0);
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if (PQCLEAN_DILITHIUM2_AVX2_polyveck_chknorm(&ct0, GAMMA2)) {
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goto rej;
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}
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PQCLEAN_DILITHIUM2_AVX2_polyveck_add(&w0, &w0, &ct0);
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PQCLEAN_DILITHIUM2_AVX2_polyveck_csubq(&w0);
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n = PQCLEAN_DILITHIUM2_AVX2_polyveck_make_hint(&h, &w0, &w1);
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if (n > OMEGA) {
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goto rej;
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}
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/* Write signature */
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PQCLEAN_DILITHIUM2_AVX2_pack_sig(sig, &z, &h, &c);
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*siglen = PQCLEAN_DILITHIUM2_AVX2_CRYPTO_BYTES;
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return 0;
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}
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/*************************************************
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* Name: PQCLEAN_DILITHIUM2_AVX2_crypto_sign
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*
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* Description: Compute signed message.
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*
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* Arguments: - uint8_t *sm: pointer to output signed message (allocated
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* array with PQCLEAN_DILITHIUM2_AVX2_CRYPTO_BYTES + mlen bytes),
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* can be equal to m
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* - size_t *smlen: pointer to output length of signed
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* message
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* - const uint8_t *m: pointer to message to be signed
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* - size_t mlen: length of message
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* - const uint8_t *sk: pointer to bit-packed secret key
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*
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* Returns 0 (success)
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**************************************************/
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int PQCLEAN_DILITHIUM2_AVX2_crypto_sign(
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uint8_t *sm, size_t *smlen,
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const uint8_t *m, size_t mlen,
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const uint8_t *sk) {
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int rc;
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memmove(sm + PQCLEAN_DILITHIUM2_AVX2_CRYPTO_BYTES, m, mlen);
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rc = PQCLEAN_DILITHIUM2_AVX2_crypto_sign_signature(sm, smlen, m, mlen, sk);
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*smlen += mlen;
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return rc;
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}
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/*************************************************
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* Name: PQCLEAN_DILITHIUM2_AVX2_crypto_sign_verify
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*
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* Description: Verify signed message.
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*
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* Arguments: - uint8_t *sig: signature
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* - size_t siglen: length of signature (PQCLEAN_DILITHIUM2_AVX2_CRYPTO_BYTES)
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* - uint8_t *m: pointer to message
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* - size_t *mlen: pointer to output length of message
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* - uint8_t *pk: pointer to bit-packed public key
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*
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* Returns 0 if signed message could be verified correctly and -1 otherwise
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**************************************************/
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int PQCLEAN_DILITHIUM2_AVX2_crypto_sign_verify(
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const uint8_t *sig, size_t siglen,
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const uint8_t *m, size_t mlen,
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const uint8_t *pk) {
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uint8_t rho[SEEDBYTES];
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uint8_t mu[CRHBYTES];
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poly c, chat, cp;
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polyvecl mat[K], z;
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polyveck t1, w1, h, tmp1, tmp2;
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if (siglen < PQCLEAN_DILITHIUM2_AVX2_CRYPTO_BYTES) {
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return -1;
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}
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PQCLEAN_DILITHIUM2_AVX2_unpack_pk(rho, &t1, pk);
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if (PQCLEAN_DILITHIUM2_AVX2_unpack_sig(&z, &h, &c, sig)) {
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return -1;
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}
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if (PQCLEAN_DILITHIUM2_AVX2_polyvecl_chknorm(&z, GAMMA1 - BETA)) {
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return -1;
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}
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/* Compute CRH(CRH(rho, t1), msg) */
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crh(mu, pk, PQCLEAN_DILITHIUM2_AVX2_CRYPTO_PUBLICKEYBYTES);
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shake256incctx state;
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shake256_inc_init(&state);
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shake256_inc_absorb(&state, mu, CRHBYTES);
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shake256_inc_absorb(&state, m, mlen);
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shake256_inc_finalize(&state);
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shake256_inc_squeeze(mu, CRHBYTES, &state);
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shake256_inc_ctx_release(&state);
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/* Matrix-vector multiplication; compute Az - c2^dt1 */
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PQCLEAN_DILITHIUM2_AVX2_expand_mat(mat, rho);
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PQCLEAN_DILITHIUM2_AVX2_polyvecl_ntt(&z);
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for (size_t i = 0; i < K; ++i) {
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PQCLEAN_DILITHIUM2_AVX2_polyvecl_pointwise_acc_invmontgomery(&tmp1.vec[i], &mat[i], &z);
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}
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chat = c;
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PQCLEAN_DILITHIUM2_AVX2_poly_ntt(&chat);
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PQCLEAN_DILITHIUM2_AVX2_polyveck_shiftl(&t1);
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PQCLEAN_DILITHIUM2_AVX2_polyveck_ntt(&t1);
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for (size_t i = 0; i < K; ++i) {
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PQCLEAN_DILITHIUM2_AVX2_poly_pointwise_invmontgomery(&tmp2.vec[i], &chat, &t1.vec[i]);
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}
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PQCLEAN_DILITHIUM2_AVX2_polyveck_sub(&tmp1, &tmp1, &tmp2);
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PQCLEAN_DILITHIUM2_AVX2_polyveck_reduce(&tmp1);
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PQCLEAN_DILITHIUM2_AVX2_polyveck_invntt_montgomery(&tmp1);
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/* Reconstruct w1 */
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PQCLEAN_DILITHIUM2_AVX2_polyveck_csubq(&tmp1);
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PQCLEAN_DILITHIUM2_AVX2_polyveck_use_hint(&w1, &tmp1, &h);
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/* Call random oracle and verify challenge */
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PQCLEAN_DILITHIUM2_AVX2_challenge(&cp, mu, &w1);
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for (size_t i = 0; i < N; ++i) {
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if (c.coeffs[i] != cp.coeffs[i]) {
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return -1;
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}
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}
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return 0;
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}
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/*************************************************
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* Name: PQCLEAN_DILITHIUM2_AVX2_crypto_sign_open
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*
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* Description: Verify signed message.
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*
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* Arguments: - uint8_t *m: pointer to output message (allocated
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* array with smlen bytes), can be equal to sm
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* - size_t *mlen: pointer to output length of message
|
|
* - const uint8_t *sm: pointer to signed message
|
|
* - size_t smlen: length of signed message
|
|
* - const uint8_t *pk: pointer to bit-packed public key
|
|
*
|
|
* Returns 0 if signed message could be verified correctly and -1 otherwise
|
|
**************************************************/
|
|
int PQCLEAN_DILITHIUM2_AVX2_crypto_sign_open(
|
|
uint8_t *m, size_t *mlen,
|
|
const uint8_t *sm, size_t smlen,
|
|
const uint8_t *pk) {
|
|
if (smlen < PQCLEAN_DILITHIUM2_AVX2_CRYPTO_BYTES) {
|
|
goto badsig;
|
|
}
|
|
*mlen = smlen - PQCLEAN_DILITHIUM2_AVX2_CRYPTO_BYTES;
|
|
|
|
if (PQCLEAN_DILITHIUM2_AVX2_crypto_sign_verify(sm, PQCLEAN_DILITHIUM2_AVX2_CRYPTO_BYTES,
|
|
sm + PQCLEAN_DILITHIUM2_AVX2_CRYPTO_BYTES, *mlen, pk)) {
|
|
goto badsig;
|
|
} else {
|
|
/* All good, copy msg, return 0 */
|
|
for (size_t i = 0; i < *mlen; ++i) {
|
|
m[i] = sm[PQCLEAN_DILITHIUM2_AVX2_CRYPTO_BYTES + i];
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/* Signature verification failed */
|
|
badsig:
|
|
*mlen = (size_t) -1;
|
|
for (size_t i = 0; i < smlen; ++i) {
|
|
m[i] = 0;
|
|
}
|
|
|
|
return -1;
|
|
}
|