mirror of
https://github.com/henrydcase/pqc.git
synced 2024-11-27 01:41:40 +00:00
0d7743d576
* Update NTRU version: https://github.com/jschanck/ntru/tree/485dde03 * Fixed ntruhrss701/clean/Makefile.Microsoft_nmake
71 lines
2.1 KiB
C
71 lines
2.1 KiB
C
#include <stdint.h>
|
|
|
|
#include "api.h"
|
|
#include "fips202.h"
|
|
#include "owcpa.h"
|
|
#include "params.h"
|
|
#include "randombytes.h"
|
|
#include "sample.h"
|
|
#include "verify.h"
|
|
|
|
// API FUNCTIONS
|
|
int PQCLEAN_NTRUHRSS701_CLEAN_crypto_kem_keypair(uint8_t *pk, uint8_t *sk) {
|
|
uint8_t seed[NTRU_SAMPLE_FG_BYTES];
|
|
|
|
randombytes(seed, NTRU_SAMPLE_FG_BYTES);
|
|
PQCLEAN_NTRUHRSS701_CLEAN_owcpa_keypair(pk, sk, seed);
|
|
|
|
randombytes(sk + NTRU_OWCPA_SECRETKEYBYTES, NTRU_PRFKEYBYTES);
|
|
|
|
return 0;
|
|
}
|
|
|
|
int PQCLEAN_NTRUHRSS701_CLEAN_crypto_kem_enc(uint8_t *c, uint8_t *k, const uint8_t *pk) {
|
|
poly r, m;
|
|
uint8_t rm[NTRU_OWCPA_MSGBYTES];
|
|
uint8_t rm_seed[NTRU_SAMPLE_RM_BYTES];
|
|
|
|
randombytes(rm_seed, NTRU_SAMPLE_RM_BYTES);
|
|
|
|
PQCLEAN_NTRUHRSS701_CLEAN_sample_rm(&r, &m, rm_seed);
|
|
|
|
PQCLEAN_NTRUHRSS701_CLEAN_poly_S3_tobytes(rm, &r);
|
|
PQCLEAN_NTRUHRSS701_CLEAN_poly_S3_tobytes(rm + NTRU_PACK_TRINARY_BYTES, &m);
|
|
sha3_256(k, rm, NTRU_OWCPA_MSGBYTES);
|
|
|
|
PQCLEAN_NTRUHRSS701_CLEAN_poly_Z3_to_Zq(&r);
|
|
PQCLEAN_NTRUHRSS701_CLEAN_owcpa_enc(c, &r, &m, pk);
|
|
|
|
return 0;
|
|
}
|
|
|
|
int PQCLEAN_NTRUHRSS701_CLEAN_crypto_kem_dec(uint8_t *k, const uint8_t *c, const uint8_t *sk) {
|
|
int i, fail;
|
|
uint8_t rm[NTRU_OWCPA_MSGBYTES];
|
|
uint8_t buf[NTRU_PRFKEYBYTES + NTRU_CIPHERTEXTBYTES];
|
|
|
|
fail = 0;
|
|
|
|
/* Check that unused bits of last byte of ciphertext are zero */
|
|
fail |= c[NTRU_CIPHERTEXTBYTES - 1] & (0xff << (8 - (7 & (NTRU_LOGQ * NTRU_PACK_DEG))));
|
|
|
|
fail |= PQCLEAN_NTRUHRSS701_CLEAN_owcpa_dec(rm, c, sk);
|
|
/* If fail = 0 then c = Enc(h, rm). There is no need to re-encapsulate. */
|
|
/* See comment in PQCLEAN_NTRUHRSS701_CLEAN_owcpa_dec for details. */
|
|
|
|
sha3_256(k, rm, NTRU_OWCPA_MSGBYTES);
|
|
|
|
/* shake(secret PRF key || input ciphertext) */
|
|
for (i = 0; i < NTRU_PRFKEYBYTES; i++) {
|
|
buf[i] = sk[i + NTRU_OWCPA_SECRETKEYBYTES];
|
|
}
|
|
for (i = 0; i < NTRU_CIPHERTEXTBYTES; i++) {
|
|
buf[NTRU_PRFKEYBYTES + i] = c[i];
|
|
}
|
|
sha3_256(rm, buf, NTRU_PRFKEYBYTES + NTRU_CIPHERTEXTBYTES);
|
|
|
|
PQCLEAN_NTRUHRSS701_CLEAN_cmov(k, rm, NTRU_SHAREDKEYBYTES, (unsigned char) fail);
|
|
|
|
return 0;
|
|
}
|