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serialize error_vector before hashing instead of pointer cast

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Leon 2019-06-07 13:02:25 +02:00
parent b320752f2a
commit 6f31e7e4c2
1 changed files with 28 additions and 17 deletions
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45
crypto_kem/ledakemlt12/clean/kem.c
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@ -8,45 +8,56 @@
/* Generates a keypair - pk is the public key and sk is the secret key. */
int PQCLEAN_LEDAKEMLT12_CLEAN_crypto_kem_keypair(unsigned char *pk, unsigned char *sk) {
AES_XOF_struct niederreiter_keys_expander;
randombytes(((privateKeyNiederreiter_t *)sk)->prng_seed, TRNG_BYTE_LENGTH);
PQCLEAN_LEDAKEMLT12_CLEAN_seedexpander_from_trng(&niederreiter_keys_expander,
((privateKeyNiederreiter_t *)sk)->prng_seed);
PQCLEAN_LEDAKEMLT12_CLEAN_niederreiter_keygen((publicKeyNiederreiter_t *) pk,
(privateKeyNiederreiter_t *) sk,
&niederreiter_keys_expander);
PQCLEAN_LEDAKEMLT12_CLEAN_seedexpander_from_trng(&niederreiter_keys_expander, ((privateKeyNiederreiter_t *)sk)->prng_seed);
PQCLEAN_LEDAKEMLT12_CLEAN_niederreiter_keygen((publicKeyNiederreiter_t *) pk, (privateKeyNiederreiter_t *) sk, &niederreiter_keys_expander);
return 0;
}
static void error_tobytes(uint8_t *error_bytes, const uint64_t *error_digits) {
size_t i, j, k;
uint64_t t;
for (i = 0; i < N0; i++) {
for (j = 0; j < NUM_DIGITS_GF2X_ELEMENT; j++) {
t = error_digits[i * NUM_DIGITS_GF2X_ELEMENT + j];
for (k = 0; k < DIGIT_SIZE_B; k++) {
error_bytes[(i * NUM_DIGITS_GF2X_ELEMENT + j) * DIGIT_SIZE_B + k] = (uint8_t) ((t >> (8 * k)) & 0xFF);
}
}
}
}
/* Encrypt - pk is the public key, ct is a key encapsulation message
(ciphertext), ss is the shared secret.*/
int PQCLEAN_LEDAKEMLT12_CLEAN_crypto_kem_enc( unsigned char *ct, unsigned char *ss, const unsigned char *pk) {
int PQCLEAN_LEDAKEMLT12_CLEAN_crypto_kem_enc(unsigned char *ct, unsigned char *ss, const unsigned char *pk) {
AES_XOF_struct niederreiter_encap_key_expander;
unsigned char encapsulated_key_seed[TRNG_BYTE_LENGTH];
DIGIT error_vector[N0 * NUM_DIGITS_GF2X_ELEMENT];
uint8_t error_bytes[N0 * NUM_DIGITS_GF2X_ELEMENT * DIGIT_SIZE_B];
randombytes(encapsulated_key_seed, TRNG_BYTE_LENGTH);
PQCLEAN_LEDAKEMLT12_CLEAN_seedexpander_from_trng(&niederreiter_encap_key_expander, encapsulated_key_seed);
PQCLEAN_LEDAKEMLT12_CLEAN_rand_circulant_blocks_sequence(error_vector, &niederreiter_encap_key_expander);
HASH_FUNCTION(ss, (const uint8_t *) error_vector, (N0 * NUM_DIGITS_GF2X_ELEMENT * DIGIT_SIZE_B));
error_tobytes(error_bytes, error_vector);
HASH_FUNCTION(ss, error_bytes, (N0 * NUM_DIGITS_GF2X_ELEMENT * DIGIT_SIZE_B));
PQCLEAN_LEDAKEMLT12_CLEAN_niederreiter_encrypt((DIGIT *) ct, (publicKeyNiederreiter_t *) pk, error_vector);
return 0;
}
/* Decrypt - ct is a key encapsulation message (ciphertext), sk is the private
key, ss is the shared secret */
int PQCLEAN_LEDAKEMLT12_CLEAN_crypto_kem_dec(unsigned char *ss,
const unsigned char *ct,
const unsigned char *sk ) {
int PQCLEAN_LEDAKEMLT12_CLEAN_crypto_kem_dec(unsigned char *ss, const unsigned char *ct, const unsigned char *sk) {
DIGIT decoded_error_vector[N0 * NUM_DIGITS_GF2X_ELEMENT];
uint8_t decoded_error_bytes[N0 * NUM_DIGITS_GF2X_ELEMENT * DIGIT_SIZE_B];
PQCLEAN_LEDAKEMLT12_CLEAN_niederreiter_decrypt(decoded_error_vector,
(privateKeyNiederreiter_t *)sk,
(DIGIT *)ct);
HASH_FUNCTION(ss, (const unsigned char *) decoded_error_vector, (N0 * NUM_DIGITS_GF2X_ELEMENT * DIGIT_SIZE_B));
PQCLEAN_LEDAKEMLT12_CLEAN_niederreiter_decrypt(decoded_error_vector, (privateKeyNiederreiter_t *)sk, (DIGIT *)ct);
error_tobytes(decoded_error_bytes, decoded_error_vector);
HASH_FUNCTION(ss, decoded_error_bytes, (N0 * NUM_DIGITS_GF2X_ELEMENT * DIGIT_SIZE_B));
return 0;
}