mirror of
https://github.com/henrydcase/pqc.git
synced 2024-11-27 01:41:40 +00:00
a655ec8a9d
* Add state destroy to SHA2 API * Include optimized SPHINCS+ implementations I've generated new implementations from the sphincsplus repository. * Don't destroy sha256ctx after finalize * Attempt to shut up MSVC * Make sure to drop errors in rmtree
410 lines
16 KiB
C
410 lines
16 KiB
C
#include <immintrin.h>
|
|
#include <stddef.h>
|
|
#include <stdint.h>
|
|
#include <string.h>
|
|
|
|
#include "address.h"
|
|
#include "api.h"
|
|
#include "fors.h"
|
|
#include "hash.h"
|
|
#include "hash_state.h"
|
|
#include "params.h"
|
|
#include "randombytes.h"
|
|
#include "thash.h"
|
|
#include "utils.h"
|
|
#include "wots.h"
|
|
|
|
|
|
/**
|
|
* Computes the leaf at a given address. First generates the WOTS key pair,
|
|
* then computes leaf by hashing horizontally.
|
|
*/
|
|
static void wots_gen_leaf(unsigned char *leaf, const unsigned char *sk_seed,
|
|
const unsigned char *pub_seed,
|
|
uint32_t addr_idx, const uint32_t tree_addr[8],
|
|
const hash_state *hash_state_seeded) {
|
|
unsigned char pk[PQCLEAN_SPHINCSSHAKE256256FROBUST_AVX2_WOTS_BYTES];
|
|
uint32_t wots_addr[8] = {0};
|
|
uint32_t wots_pk_addr[8] = {0};
|
|
|
|
PQCLEAN_SPHINCSSHAKE256256FROBUST_AVX2_set_type(
|
|
wots_addr, PQCLEAN_SPHINCSSHAKE256256FROBUST_AVX2_ADDR_TYPE_WOTS);
|
|
PQCLEAN_SPHINCSSHAKE256256FROBUST_AVX2_set_type(
|
|
wots_pk_addr, PQCLEAN_SPHINCSSHAKE256256FROBUST_AVX2_ADDR_TYPE_WOTSPK);
|
|
|
|
PQCLEAN_SPHINCSSHAKE256256FROBUST_AVX2_copy_subtree_addr(
|
|
wots_addr, tree_addr);
|
|
PQCLEAN_SPHINCSSHAKE256256FROBUST_AVX2_set_keypair_addr(
|
|
wots_addr, addr_idx);
|
|
PQCLEAN_SPHINCSSHAKE256256FROBUST_AVX2_wots_gen_pk(
|
|
pk, sk_seed, pub_seed, wots_addr, hash_state_seeded);
|
|
|
|
PQCLEAN_SPHINCSSHAKE256256FROBUST_AVX2_copy_keypair_addr(
|
|
wots_pk_addr, wots_addr);
|
|
PQCLEAN_SPHINCSSHAKE256256FROBUST_AVX2_thash_WOTS_LEN(
|
|
leaf, pk, pub_seed, wots_pk_addr, hash_state_seeded);
|
|
}
|
|
|
|
/*
|
|
* Returns the length of a secret key, in bytes
|
|
*/
|
|
size_t PQCLEAN_SPHINCSSHAKE256256FROBUST_AVX2_crypto_sign_secretkeybytes(void) {
|
|
return PQCLEAN_SPHINCSSHAKE256256FROBUST_AVX2_CRYPTO_SECRETKEYBYTES;
|
|
}
|
|
|
|
/*
|
|
* Returns the length of a public key, in bytes
|
|
*/
|
|
size_t PQCLEAN_SPHINCSSHAKE256256FROBUST_AVX2_crypto_sign_publickeybytes(void) {
|
|
return PQCLEAN_SPHINCSSHAKE256256FROBUST_AVX2_CRYPTO_PUBLICKEYBYTES;
|
|
}
|
|
|
|
/*
|
|
* Returns the length of a signature, in bytes
|
|
*/
|
|
size_t PQCLEAN_SPHINCSSHAKE256256FROBUST_AVX2_crypto_sign_bytes(void) {
|
|
return PQCLEAN_SPHINCSSHAKE256256FROBUST_AVX2_CRYPTO_BYTES;
|
|
}
|
|
|
|
/*
|
|
* Returns the length of the seed required to generate a key pair, in bytes
|
|
*/
|
|
size_t PQCLEAN_SPHINCSSHAKE256256FROBUST_AVX2_crypto_sign_seedbytes(void) {
|
|
return PQCLEAN_SPHINCSSHAKE256256FROBUST_AVX2_CRYPTO_SEEDBYTES;
|
|
}
|
|
|
|
/*
|
|
* Generates an SPX key pair given a seed of length
|
|
* Format sk: [SK_SEED || SK_PRF || PUB_SEED || root]
|
|
* Format pk: [PUB_SEED || root]
|
|
*/
|
|
int PQCLEAN_SPHINCSSHAKE256256FROBUST_AVX2_crypto_sign_seed_keypair(
|
|
uint8_t *pk, uint8_t *sk, const uint8_t *seed) {
|
|
/* We do not need the auth path in key generation, but it simplifies the
|
|
code to have just one treehash routine that computes both root and path
|
|
in one function. */
|
|
unsigned char auth_path[PQCLEAN_SPHINCSSHAKE256256FROBUST_AVX2_TREE_HEIGHT * PQCLEAN_SPHINCSSHAKE256256FROBUST_AVX2_N];
|
|
uint32_t top_tree_addr[8] = {0};
|
|
hash_state hash_state_seeded;
|
|
|
|
PQCLEAN_SPHINCSSHAKE256256FROBUST_AVX2_set_layer_addr(
|
|
top_tree_addr, PQCLEAN_SPHINCSSHAKE256256FROBUST_AVX2_D - 1);
|
|
PQCLEAN_SPHINCSSHAKE256256FROBUST_AVX2_set_type(
|
|
top_tree_addr, PQCLEAN_SPHINCSSHAKE256256FROBUST_AVX2_ADDR_TYPE_HASHTREE);
|
|
|
|
/* Initialize SK_SEED, SK_PRF and PUB_SEED from seed. */
|
|
memcpy(sk, seed, PQCLEAN_SPHINCSSHAKE256256FROBUST_AVX2_CRYPTO_SEEDBYTES);
|
|
|
|
memcpy(pk, sk + 2 * PQCLEAN_SPHINCSSHAKE256256FROBUST_AVX2_N, PQCLEAN_SPHINCSSHAKE256256FROBUST_AVX2_N);
|
|
|
|
/* This hook allows the hash function instantiation to do whatever
|
|
preparation or computation it needs, based on the public seed. */
|
|
PQCLEAN_SPHINCSSHAKE256256FROBUST_AVX2_initialize_hash_function(&hash_state_seeded, pk, sk);
|
|
|
|
/* Compute root node of the top-most subtree. */
|
|
PQCLEAN_SPHINCSSHAKE256256FROBUST_AVX2_treehash_TREE_HEIGHT(
|
|
sk + 3 * PQCLEAN_SPHINCSSHAKE256256FROBUST_AVX2_N, auth_path, sk, sk + 2 * PQCLEAN_SPHINCSSHAKE256256FROBUST_AVX2_N, 0, 0,
|
|
wots_gen_leaf, top_tree_addr, &hash_state_seeded);
|
|
|
|
memcpy(pk + PQCLEAN_SPHINCSSHAKE256256FROBUST_AVX2_N, sk + 3 * PQCLEAN_SPHINCSSHAKE256256FROBUST_AVX2_N, PQCLEAN_SPHINCSSHAKE256256FROBUST_AVX2_N);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Generates an SPX key pair.
|
|
* Format sk: [SK_SEED || SK_PRF || PUB_SEED || root]
|
|
* Format pk: [PUB_SEED || root]
|
|
*/
|
|
int PQCLEAN_SPHINCSSHAKE256256FROBUST_AVX2_crypto_sign_keypair(
|
|
uint8_t *pk, uint8_t *sk) {
|
|
|
|
// guarantee alignment of pk
|
|
union {
|
|
__m128 _x[PQCLEAN_SPHINCSSHAKE256256FROBUST_AVX2_CRYPTO_PUBLICKEYBYTES / 16];
|
|
uint8_t pk[PQCLEAN_SPHINCSSHAKE256256FROBUST_AVX2_CRYPTO_PUBLICKEYBYTES];
|
|
} aligned_pk;
|
|
|
|
// guarantee alignment of sk
|
|
union {
|
|
__m128 _x[PQCLEAN_SPHINCSSHAKE256256FROBUST_AVX2_CRYPTO_SECRETKEYBYTES / 16];
|
|
uint8_t sk[PQCLEAN_SPHINCSSHAKE256256FROBUST_AVX2_CRYPTO_SECRETKEYBYTES];
|
|
} aligned_sk;
|
|
|
|
union {
|
|
__m128 _x[PQCLEAN_SPHINCSSHAKE256256FROBUST_AVX2_CRYPTO_SEEDBYTES / 16];
|
|
uint8_t seed[PQCLEAN_SPHINCSSHAKE256256FROBUST_AVX2_CRYPTO_SEEDBYTES];
|
|
} aligned_seed;
|
|
randombytes(aligned_seed.seed, PQCLEAN_SPHINCSSHAKE256256FROBUST_AVX2_CRYPTO_SEEDBYTES);
|
|
|
|
PQCLEAN_SPHINCSSHAKE256256FROBUST_AVX2_crypto_sign_seed_keypair(
|
|
aligned_pk.pk, aligned_sk.sk, aligned_seed.seed);
|
|
memcpy(pk, aligned_pk.pk, PQCLEAN_SPHINCSSHAKE256256FROBUST_AVX2_CRYPTO_PUBLICKEYBYTES);
|
|
memcpy(sk, aligned_sk.sk, PQCLEAN_SPHINCSSHAKE256256FROBUST_AVX2_CRYPTO_SECRETKEYBYTES);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* Returns an array containing a detached signature.
|
|
*/
|
|
int PQCLEAN_SPHINCSSHAKE256256FROBUST_AVX2_crypto_sign_signature(
|
|
uint8_t *sig, size_t *siglen,
|
|
const uint8_t *m, size_t mlen, const uint8_t *sk) {
|
|
// guarantee alignment of sk
|
|
union {
|
|
__m128 *_x;
|
|
uint8_t sk[PQCLEAN_SPHINCSSHAKE256256FROBUST_AVX2_CRYPTO_SECRETKEYBYTES];
|
|
} aligned_sk;
|
|
memcpy(aligned_sk.sk, sk, PQCLEAN_SPHINCSSHAKE256256FROBUST_AVX2_CRYPTO_SECRETKEYBYTES);
|
|
sk = aligned_sk.sk;
|
|
|
|
// guarantee alignment of sig
|
|
union {
|
|
__m128 *_x;
|
|
uint8_t sig[PQCLEAN_SPHINCSSHAKE256256FROBUST_AVX2_BYTES];
|
|
} aligned_sig;
|
|
uint8_t *orig_sig = sig;
|
|
sig = (uint8_t *)aligned_sig.sig;
|
|
|
|
const unsigned char *sk_seed = sk;
|
|
const unsigned char *sk_prf = sk + PQCLEAN_SPHINCSSHAKE256256FROBUST_AVX2_N;
|
|
const unsigned char *pk = sk + 2 * PQCLEAN_SPHINCSSHAKE256256FROBUST_AVX2_N;
|
|
const unsigned char *pub_seed = pk;
|
|
|
|
unsigned char optrand[PQCLEAN_SPHINCSSHAKE256256FROBUST_AVX2_N];
|
|
unsigned char mhash[PQCLEAN_SPHINCSSHAKE256256FROBUST_AVX2_FORS_MSG_BYTES];
|
|
unsigned char root[PQCLEAN_SPHINCSSHAKE256256FROBUST_AVX2_N];
|
|
uint32_t i;
|
|
uint64_t tree;
|
|
uint32_t idx_leaf;
|
|
uint32_t wots_addr[8] = {0};
|
|
uint32_t tree_addr[8] = {0};
|
|
|
|
hash_state hash_state_seeded;
|
|
|
|
/* This hook allows the hash function instantiation to do whatever
|
|
preparation or computation it needs, based on the public seed. */
|
|
PQCLEAN_SPHINCSSHAKE256256FROBUST_AVX2_initialize_hash_function(
|
|
&hash_state_seeded,
|
|
pub_seed, sk_seed);
|
|
|
|
PQCLEAN_SPHINCSSHAKE256256FROBUST_AVX2_set_type(
|
|
wots_addr, PQCLEAN_SPHINCSSHAKE256256FROBUST_AVX2_ADDR_TYPE_WOTS);
|
|
PQCLEAN_SPHINCSSHAKE256256FROBUST_AVX2_set_type(
|
|
tree_addr, PQCLEAN_SPHINCSSHAKE256256FROBUST_AVX2_ADDR_TYPE_HASHTREE);
|
|
|
|
/* Optionally, signing can be made non-deterministic using optrand.
|
|
This can help counter side-channel attacks that would benefit from
|
|
getting a large number of traces when the signer uses the same nodes. */
|
|
randombytes(optrand, PQCLEAN_SPHINCSSHAKE256256FROBUST_AVX2_N);
|
|
/* Compute the digest randomization value. */
|
|
PQCLEAN_SPHINCSSHAKE256256FROBUST_AVX2_gen_message_random(
|
|
sig, sk_prf, optrand, m, mlen, &hash_state_seeded);
|
|
|
|
/* Derive the message digest and leaf index from R, PK and M. */
|
|
PQCLEAN_SPHINCSSHAKE256256FROBUST_AVX2_hash_message(
|
|
mhash, &tree, &idx_leaf, sig, pk, m, mlen, &hash_state_seeded);
|
|
sig += PQCLEAN_SPHINCSSHAKE256256FROBUST_AVX2_N;
|
|
|
|
PQCLEAN_SPHINCSSHAKE256256FROBUST_AVX2_set_tree_addr(wots_addr, tree);
|
|
PQCLEAN_SPHINCSSHAKE256256FROBUST_AVX2_set_keypair_addr(
|
|
wots_addr, idx_leaf);
|
|
|
|
/* Sign the message hash using FORS. */
|
|
PQCLEAN_SPHINCSSHAKE256256FROBUST_AVX2_fors_sign(
|
|
sig, root, mhash, sk_seed, pub_seed, wots_addr, &hash_state_seeded);
|
|
sig += PQCLEAN_SPHINCSSHAKE256256FROBUST_AVX2_FORS_BYTES;
|
|
|
|
for (i = 0; i < PQCLEAN_SPHINCSSHAKE256256FROBUST_AVX2_D; i++) {
|
|
PQCLEAN_SPHINCSSHAKE256256FROBUST_AVX2_set_layer_addr(tree_addr, i);
|
|
PQCLEAN_SPHINCSSHAKE256256FROBUST_AVX2_set_tree_addr(tree_addr, tree);
|
|
|
|
PQCLEAN_SPHINCSSHAKE256256FROBUST_AVX2_copy_subtree_addr(
|
|
wots_addr, tree_addr);
|
|
PQCLEAN_SPHINCSSHAKE256256FROBUST_AVX2_set_keypair_addr(
|
|
wots_addr, idx_leaf);
|
|
|
|
/* Compute a WOTS signature. */
|
|
PQCLEAN_SPHINCSSHAKE256256FROBUST_AVX2_wots_sign(
|
|
sig, root, sk_seed, pub_seed, wots_addr, &hash_state_seeded);
|
|
sig += PQCLEAN_SPHINCSSHAKE256256FROBUST_AVX2_WOTS_BYTES;
|
|
|
|
/* Compute the authentication path for the used WOTS leaf. */
|
|
PQCLEAN_SPHINCSSHAKE256256FROBUST_AVX2_treehash_TREE_HEIGHT(
|
|
root, sig, sk_seed, pub_seed, idx_leaf, 0,
|
|
wots_gen_leaf, tree_addr, &hash_state_seeded);
|
|
sig += PQCLEAN_SPHINCSSHAKE256256FROBUST_AVX2_TREE_HEIGHT * PQCLEAN_SPHINCSSHAKE256256FROBUST_AVX2_N;
|
|
|
|
/* Update the indices for the next layer. */
|
|
idx_leaf = (tree & ((1 << PQCLEAN_SPHINCSSHAKE256256FROBUST_AVX2_TREE_HEIGHT) - 1));
|
|
tree = tree >> PQCLEAN_SPHINCSSHAKE256256FROBUST_AVX2_TREE_HEIGHT;
|
|
}
|
|
|
|
memcpy(orig_sig, aligned_sig.sig, PQCLEAN_SPHINCSSHAKE256256FROBUST_AVX2_BYTES);
|
|
*siglen = PQCLEAN_SPHINCSSHAKE256256FROBUST_AVX2_BYTES;
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* Verifies a detached signature and message under a given public key.
|
|
*/
|
|
int PQCLEAN_SPHINCSSHAKE256256FROBUST_AVX2_crypto_sign_verify(
|
|
const uint8_t *sig, size_t siglen,
|
|
const uint8_t *m, size_t mlen, const uint8_t *pk) {
|
|
// guarantee alignment of pk
|
|
union {
|
|
__m128 *_x;
|
|
uint8_t pk[PQCLEAN_SPHINCSSHAKE256256FROBUST_AVX2_CRYPTO_PUBLICKEYBYTES];
|
|
} aligned_pk;
|
|
memcpy(aligned_pk.pk, pk, PQCLEAN_SPHINCSSHAKE256256FROBUST_AVX2_CRYPTO_PUBLICKEYBYTES);
|
|
pk = aligned_pk.pk;
|
|
|
|
const unsigned char *pub_seed = pk;
|
|
const unsigned char *pub_root = pk + PQCLEAN_SPHINCSSHAKE256256FROBUST_AVX2_N;
|
|
unsigned char mhash[PQCLEAN_SPHINCSSHAKE256256FROBUST_AVX2_FORS_MSG_BYTES];
|
|
unsigned char wots_pk[PQCLEAN_SPHINCSSHAKE256256FROBUST_AVX2_WOTS_BYTES];
|
|
unsigned char root[PQCLEAN_SPHINCSSHAKE256256FROBUST_AVX2_N];
|
|
unsigned char leaf[PQCLEAN_SPHINCSSHAKE256256FROBUST_AVX2_N];
|
|
unsigned int i;
|
|
uint64_t tree;
|
|
uint32_t idx_leaf;
|
|
uint32_t wots_addr[8] = {0};
|
|
uint32_t tree_addr[8] = {0};
|
|
uint32_t wots_pk_addr[8] = {0};
|
|
|
|
hash_state hash_state_seeded;
|
|
|
|
if (siglen != PQCLEAN_SPHINCSSHAKE256256FROBUST_AVX2_BYTES) {
|
|
return -1;
|
|
}
|
|
|
|
/* This hook allows the hash function instantiation to do whatever
|
|
preparation or computation it needs, based on the public seed. */
|
|
PQCLEAN_SPHINCSSHAKE256256FROBUST_AVX2_initialize_hash_function(
|
|
&hash_state_seeded,
|
|
pub_seed, NULL);
|
|
|
|
PQCLEAN_SPHINCSSHAKE256256FROBUST_AVX2_set_type(
|
|
wots_addr, PQCLEAN_SPHINCSSHAKE256256FROBUST_AVX2_ADDR_TYPE_WOTS);
|
|
PQCLEAN_SPHINCSSHAKE256256FROBUST_AVX2_set_type(
|
|
tree_addr, PQCLEAN_SPHINCSSHAKE256256FROBUST_AVX2_ADDR_TYPE_HASHTREE);
|
|
PQCLEAN_SPHINCSSHAKE256256FROBUST_AVX2_set_type(
|
|
wots_pk_addr, PQCLEAN_SPHINCSSHAKE256256FROBUST_AVX2_ADDR_TYPE_WOTSPK);
|
|
|
|
/* Derive the message digest and leaf index from R || PK || M. */
|
|
/* The additional PQCLEAN_SPHINCSSHAKE256256FROBUST_AVX2_N is a result of the hash domain separator. */
|
|
PQCLEAN_SPHINCSSHAKE256256FROBUST_AVX2_hash_message(
|
|
mhash, &tree, &idx_leaf, sig, pk, m, mlen, &hash_state_seeded);
|
|
sig += PQCLEAN_SPHINCSSHAKE256256FROBUST_AVX2_N;
|
|
|
|
/* Layer correctly defaults to 0, so no need to set_layer_addr */
|
|
PQCLEAN_SPHINCSSHAKE256256FROBUST_AVX2_set_tree_addr(wots_addr, tree);
|
|
PQCLEAN_SPHINCSSHAKE256256FROBUST_AVX2_set_keypair_addr(
|
|
wots_addr, idx_leaf);
|
|
|
|
PQCLEAN_SPHINCSSHAKE256256FROBUST_AVX2_fors_pk_from_sig(
|
|
root, sig, mhash, pub_seed, wots_addr, &hash_state_seeded);
|
|
sig += PQCLEAN_SPHINCSSHAKE256256FROBUST_AVX2_FORS_BYTES;
|
|
|
|
/* For each subtree.. */
|
|
for (i = 0; i < PQCLEAN_SPHINCSSHAKE256256FROBUST_AVX2_D; i++) {
|
|
PQCLEAN_SPHINCSSHAKE256256FROBUST_AVX2_set_layer_addr(tree_addr, i);
|
|
PQCLEAN_SPHINCSSHAKE256256FROBUST_AVX2_set_tree_addr(tree_addr, tree);
|
|
|
|
PQCLEAN_SPHINCSSHAKE256256FROBUST_AVX2_copy_subtree_addr(
|
|
wots_addr, tree_addr);
|
|
PQCLEAN_SPHINCSSHAKE256256FROBUST_AVX2_set_keypair_addr(
|
|
wots_addr, idx_leaf);
|
|
|
|
PQCLEAN_SPHINCSSHAKE256256FROBUST_AVX2_copy_keypair_addr(
|
|
wots_pk_addr, wots_addr);
|
|
|
|
/* The WOTS public key is only correct if the signature was correct. */
|
|
/* Initially, root is the FORS pk, but on subsequent iterations it is
|
|
the root of the subtree below the currently processed subtree. */
|
|
PQCLEAN_SPHINCSSHAKE256256FROBUST_AVX2_wots_pk_from_sig(
|
|
wots_pk, sig, root, pub_seed, wots_addr, &hash_state_seeded);
|
|
sig += PQCLEAN_SPHINCSSHAKE256256FROBUST_AVX2_WOTS_BYTES;
|
|
|
|
/* Compute the leaf node using the WOTS public key. */
|
|
PQCLEAN_SPHINCSSHAKE256256FROBUST_AVX2_thash_WOTS_LEN(
|
|
leaf, wots_pk, pub_seed, wots_pk_addr, &hash_state_seeded);
|
|
|
|
/* Compute the root node of this subtree. */
|
|
PQCLEAN_SPHINCSSHAKE256256FROBUST_AVX2_compute_root(
|
|
root, leaf, idx_leaf, 0, sig, PQCLEAN_SPHINCSSHAKE256256FROBUST_AVX2_TREE_HEIGHT,
|
|
pub_seed, tree_addr, &hash_state_seeded);
|
|
sig += PQCLEAN_SPHINCSSHAKE256256FROBUST_AVX2_TREE_HEIGHT * PQCLEAN_SPHINCSSHAKE256256FROBUST_AVX2_N;
|
|
|
|
/* Update the indices for the next layer. */
|
|
idx_leaf = (tree & ((1 << PQCLEAN_SPHINCSSHAKE256256FROBUST_AVX2_TREE_HEIGHT) - 1));
|
|
tree = tree >> PQCLEAN_SPHINCSSHAKE256256FROBUST_AVX2_TREE_HEIGHT;
|
|
}
|
|
|
|
/* Check if the root node equals the root node in the public key. */
|
|
if (memcmp(root, pub_root, PQCLEAN_SPHINCSSHAKE256256FROBUST_AVX2_N) != 0) {
|
|
return -1;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
|
|
/**
|
|
* Returns an array containing the signature followed by the message.
|
|
*/
|
|
int PQCLEAN_SPHINCSSHAKE256256FROBUST_AVX2_crypto_sign(
|
|
uint8_t *sm, size_t *smlen,
|
|
const uint8_t *m, size_t mlen, const uint8_t *sk) {
|
|
size_t siglen;
|
|
|
|
PQCLEAN_SPHINCSSHAKE256256FROBUST_AVX2_crypto_sign_signature(
|
|
sm, &siglen, m, mlen, sk);
|
|
|
|
memmove(sm + PQCLEAN_SPHINCSSHAKE256256FROBUST_AVX2_BYTES, m, mlen);
|
|
*smlen = siglen + mlen;
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* Verifies a given signature-message pair under a given public key.
|
|
*/
|
|
int PQCLEAN_SPHINCSSHAKE256256FROBUST_AVX2_crypto_sign_open(
|
|
uint8_t *m, size_t *mlen,
|
|
const uint8_t *sm, size_t smlen, const uint8_t *pk) {
|
|
|
|
// guarantee alignment of pk
|
|
union {
|
|
__m128 *_x;
|
|
uint8_t pk[PQCLEAN_SPHINCSSHAKE256256FROBUST_AVX2_CRYPTO_PUBLICKEYBYTES];
|
|
} aligned_pk;
|
|
memcpy(aligned_pk.pk, pk, PQCLEAN_SPHINCSSHAKE256256FROBUST_AVX2_CRYPTO_PUBLICKEYBYTES);
|
|
pk = aligned_pk.pk;
|
|
|
|
|
|
/* The API caller does not necessarily know what size a signature should be
|
|
but SPHINCS+ signatures are always exactly PQCLEAN_SPHINCSSHAKE256256FROBUST_AVX2_BYTES. */
|
|
if (smlen < PQCLEAN_SPHINCSSHAKE256256FROBUST_AVX2_BYTES) {
|
|
memset(m, 0, smlen);
|
|
*mlen = 0;
|
|
return -1;
|
|
}
|
|
|
|
*mlen = smlen - PQCLEAN_SPHINCSSHAKE256256FROBUST_AVX2_BYTES;
|
|
|
|
if (PQCLEAN_SPHINCSSHAKE256256FROBUST_AVX2_crypto_sign_verify(
|
|
sm, PQCLEAN_SPHINCSSHAKE256256FROBUST_AVX2_BYTES, sm + PQCLEAN_SPHINCSSHAKE256256FROBUST_AVX2_BYTES, *mlen, pk)) {
|
|
memset(m, 0, smlen);
|
|
*mlen = 0;
|
|
return -1;
|
|
}
|
|
|
|
/* If verification was successful, move the message to the right place. */
|
|
memmove(m, sm + PQCLEAN_SPHINCSSHAKE256256FROBUST_AVX2_BYTES, *mlen);
|
|
|
|
return 0;
|
|
}
|