diff options
Diffstat (limited to 'lib/liboqs/src/sig/sphincs/pqclean_sphincs-shake256-128f-simple_clean/hash_shake256.c')
-rw-r--r-- | lib/liboqs/src/sig/sphincs/pqclean_sphincs-shake256-128f-simple_clean/hash_shake256.c | 106 |
1 files changed, 106 insertions, 0 deletions
diff --git a/lib/liboqs/src/sig/sphincs/pqclean_sphincs-shake256-128f-simple_clean/hash_shake256.c b/lib/liboqs/src/sig/sphincs/pqclean_sphincs-shake256-128f-simple_clean/hash_shake256.c new file mode 100644 index 000000000..1719f18a5 --- /dev/null +++ b/lib/liboqs/src/sig/sphincs/pqclean_sphincs-shake256-128f-simple_clean/hash_shake256.c @@ -0,0 +1,106 @@ +#include <stdint.h> +#include <string.h> + +#include "address.h" +#include "hash.h" +#include "params.h" +#include "utils.h" + +#include "fips202.h" + +/* For SHAKE256, there is no immediate reason to initialize at the start, + so this function is an empty operation. */ +void PQCLEAN_SPHINCSSHAKE256128FSIMPLE_CLEAN_initialize_hash_function( + hash_state *hash_state_seeded, // NOLINT(readability-non-const-parameter) + const unsigned char *pub_seed, const unsigned char *sk_seed) { + (void)hash_state_seeded; /* Suppress an 'unused parameter' warning. */ + (void)pub_seed; /* Suppress an 'unused parameter' warning. */ + (void)sk_seed; /* Suppress an 'unused parameter' warning. */ +} + +/* This is not necessary for SHAKE256, so we don't do anything */ +void PQCLEAN_SPHINCSSHAKE256128FSIMPLE_CLEAN_destroy_hash_function( + hash_state *hash_state_seeded) { // NOLINT(readability-non-const-parameter) + (void)hash_state_seeded; +} + +/* + * Computes PRF(key, addr), given a secret key of PQCLEAN_SPHINCSSHAKE256128FSIMPLE_CLEAN_N bytes and an address + */ +void PQCLEAN_SPHINCSSHAKE256128FSIMPLE_CLEAN_prf_addr( + unsigned char *out, const unsigned char *key, const uint32_t addr[8], + const hash_state *hash_state_seeded) { + unsigned char buf[PQCLEAN_SPHINCSSHAKE256128FSIMPLE_CLEAN_N + PQCLEAN_SPHINCSSHAKE256128FSIMPLE_CLEAN_ADDR_BYTES]; + + memcpy(buf, key, PQCLEAN_SPHINCSSHAKE256128FSIMPLE_CLEAN_N); + PQCLEAN_SPHINCSSHAKE256128FSIMPLE_CLEAN_addr_to_bytes(buf + PQCLEAN_SPHINCSSHAKE256128FSIMPLE_CLEAN_N, addr); + + shake256(out, PQCLEAN_SPHINCSSHAKE256128FSIMPLE_CLEAN_N, buf, PQCLEAN_SPHINCSSHAKE256128FSIMPLE_CLEAN_N + PQCLEAN_SPHINCSSHAKE256128FSIMPLE_CLEAN_ADDR_BYTES); + + (void)hash_state_seeded; /* Prevent unused parameter warning. */ +} + +/** + * Computes the message-dependent randomness R, using a secret seed and an + * optional randomization value as well as the message. + */ +void PQCLEAN_SPHINCSSHAKE256128FSIMPLE_CLEAN_gen_message_random( + unsigned char *R, + const unsigned char *sk_prf, const unsigned char *optrand, + const unsigned char *m, size_t mlen, + const hash_state *hash_state_seeded) { + shake256incctx state; + + shake256_inc_init(&state); + shake256_inc_absorb(&state, sk_prf, PQCLEAN_SPHINCSSHAKE256128FSIMPLE_CLEAN_N); + shake256_inc_absorb(&state, optrand, PQCLEAN_SPHINCSSHAKE256128FSIMPLE_CLEAN_N); + shake256_inc_absorb(&state, m, mlen); + shake256_inc_finalize(&state); + shake256_inc_squeeze(R, PQCLEAN_SPHINCSSHAKE256128FSIMPLE_CLEAN_N, &state); + shake256_inc_ctx_release(&state); + + (void)hash_state_seeded; /* Prevent unused parameter warning. */ +} + +/** + * Computes the message hash using R, the public key, and the message. + * Outputs the message digest and the index of the leaf. The index is split in + * the tree index and the leaf index, for convenient copying to an address. + */ +void PQCLEAN_SPHINCSSHAKE256128FSIMPLE_CLEAN_hash_message( + unsigned char *digest, uint64_t *tree, uint32_t *leaf_idx, + const unsigned char *R, const unsigned char *pk, + const unsigned char *m, size_t mlen, + const hash_state *hash_state_seeded) { +#define PQCLEAN_SPHINCSSHAKE256128FSIMPLE_CLEAN_TREE_BITS (PQCLEAN_SPHINCSSHAKE256128FSIMPLE_CLEAN_TREE_HEIGHT * (PQCLEAN_SPHINCSSHAKE256128FSIMPLE_CLEAN_D - 1)) +#define PQCLEAN_SPHINCSSHAKE256128FSIMPLE_CLEAN_TREE_BYTES ((PQCLEAN_SPHINCSSHAKE256128FSIMPLE_CLEAN_TREE_BITS + 7) / 8) +#define PQCLEAN_SPHINCSSHAKE256128FSIMPLE_CLEAN_LEAF_BITS PQCLEAN_SPHINCSSHAKE256128FSIMPLE_CLEAN_TREE_HEIGHT +#define PQCLEAN_SPHINCSSHAKE256128FSIMPLE_CLEAN_LEAF_BYTES ((PQCLEAN_SPHINCSSHAKE256128FSIMPLE_CLEAN_LEAF_BITS + 7) / 8) +#define PQCLEAN_SPHINCSSHAKE256128FSIMPLE_CLEAN_DGST_BYTES (PQCLEAN_SPHINCSSHAKE256128FSIMPLE_CLEAN_FORS_MSG_BYTES + PQCLEAN_SPHINCSSHAKE256128FSIMPLE_CLEAN_TREE_BYTES + PQCLEAN_SPHINCSSHAKE256128FSIMPLE_CLEAN_LEAF_BYTES) + + unsigned char buf[PQCLEAN_SPHINCSSHAKE256128FSIMPLE_CLEAN_DGST_BYTES]; + unsigned char *bufp = buf; + shake256incctx state; + + shake256_inc_init(&state); + shake256_inc_absorb(&state, R, PQCLEAN_SPHINCSSHAKE256128FSIMPLE_CLEAN_N); + shake256_inc_absorb(&state, pk, PQCLEAN_SPHINCSSHAKE256128FSIMPLE_CLEAN_PK_BYTES); + shake256_inc_absorb(&state, m, mlen); + shake256_inc_finalize(&state); + shake256_inc_squeeze(buf, PQCLEAN_SPHINCSSHAKE256128FSIMPLE_CLEAN_DGST_BYTES, &state); + shake256_inc_ctx_release(&state); + + memcpy(digest, bufp, PQCLEAN_SPHINCSSHAKE256128FSIMPLE_CLEAN_FORS_MSG_BYTES); + bufp += PQCLEAN_SPHINCSSHAKE256128FSIMPLE_CLEAN_FORS_MSG_BYTES; + + *tree = PQCLEAN_SPHINCSSHAKE256128FSIMPLE_CLEAN_bytes_to_ull( + bufp, PQCLEAN_SPHINCSSHAKE256128FSIMPLE_CLEAN_TREE_BYTES); + *tree &= (~(uint64_t)0) >> (64 - PQCLEAN_SPHINCSSHAKE256128FSIMPLE_CLEAN_TREE_BITS); + bufp += PQCLEAN_SPHINCSSHAKE256128FSIMPLE_CLEAN_TREE_BYTES; + + *leaf_idx = (uint32_t)PQCLEAN_SPHINCSSHAKE256128FSIMPLE_CLEAN_bytes_to_ull( + bufp, PQCLEAN_SPHINCSSHAKE256128FSIMPLE_CLEAN_LEAF_BYTES); + *leaf_idx &= (~(uint32_t)0) >> (32 - PQCLEAN_SPHINCSSHAKE256128FSIMPLE_CLEAN_LEAF_BITS); + + (void)hash_state_seeded; /* Prevent unused parameter warning. */ +} |