mirror of
https://github.com/henrydcase/pqc.git
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57 lines
2.6 KiB
C
57 lines
2.6 KiB
C
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#include "api.h"
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#include "niederreiter.h"
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#include "randombytes.h"
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#include "rng.h"
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#include <string.h>
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/* Generates a keypair - pk is the public key and sk is the secret key. */
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int PQCLEAN_LEDAKEMLT32_CLEAN_crypto_kem_keypair(unsigned char *pk, unsigned char *sk) {
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AES_XOF_struct niederreiter_keys_expander;
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randombytes(((privateKeyNiederreiter_t *)sk)->prng_seed, TRNG_BYTE_LENGTH);
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PQCLEAN_LEDAKEMLT32_CLEAN_seedexpander_from_trng(&niederreiter_keys_expander, ((privateKeyNiederreiter_t *)sk)->prng_seed);
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PQCLEAN_LEDAKEMLT32_CLEAN_niederreiter_keygen((publicKeyNiederreiter_t *) pk, (privateKeyNiederreiter_t *) sk, &niederreiter_keys_expander);
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return 0;
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}
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static void pack_error(uint8_t *error_bytes, const DIGIT *error_digits) {
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size_t i;
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for (i = 0; i < N0; i++) {
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PQCLEAN_LEDAKEMLT32_CLEAN_gf2x_tobytes(error_bytes + i * NUM_DIGITS_GF2X_ELEMENT * DIGIT_SIZE_B, error_digits + i * NUM_DIGITS_GF2X_ELEMENT);
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}
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}
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/* Encrypt - pk is the public key, ct is a key encapsulation message
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(ciphertext), ss is the shared secret.*/
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int PQCLEAN_LEDAKEMLT32_CLEAN_crypto_kem_enc(unsigned char *ct, unsigned char *ss, const unsigned char *pk) {
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AES_XOF_struct niederreiter_encap_key_expander;
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unsigned char encapsulated_key_seed[TRNG_BYTE_LENGTH];
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DIGIT error_vector[N0 * NUM_DIGITS_GF2X_ELEMENT];
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uint8_t error_bytes[N0 * NUM_DIGITS_GF2X_ELEMENT * DIGIT_SIZE_B];
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randombytes(encapsulated_key_seed, TRNG_BYTE_LENGTH);
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PQCLEAN_LEDAKEMLT32_CLEAN_seedexpander_from_trng(&niederreiter_encap_key_expander, encapsulated_key_seed);
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PQCLEAN_LEDAKEMLT32_CLEAN_rand_circulant_blocks_sequence(error_vector, &niederreiter_encap_key_expander);
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pack_error(error_bytes, error_vector);
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HASH_FUNCTION(ss, error_bytes, (N0 * NUM_DIGITS_GF2X_ELEMENT * DIGIT_SIZE_B));
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PQCLEAN_LEDAKEMLT32_CLEAN_niederreiter_encrypt((DIGIT *) ct, (publicKeyNiederreiter_t *) pk, error_vector);
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return 0;
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}
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/* Decrypt - ct is a key encapsulation message (ciphertext), sk is the private
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key, ss is the shared secret */
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int PQCLEAN_LEDAKEMLT32_CLEAN_crypto_kem_dec(unsigned char *ss, const unsigned char *ct, const unsigned char *sk) {
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DIGIT decoded_error_vector[N0 * NUM_DIGITS_GF2X_ELEMENT];
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uint8_t decoded_error_bytes[N0 * NUM_DIGITS_GF2X_ELEMENT * DIGIT_SIZE_B];
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PQCLEAN_LEDAKEMLT32_CLEAN_niederreiter_decrypt(decoded_error_vector, (privateKeyNiederreiter_t *)sk, (DIGIT *)ct);
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pack_error(decoded_error_bytes, decoded_error_vector);
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HASH_FUNCTION(ss, decoded_error_bytes, (N0 * NUM_DIGITS_GF2X_ELEMENT * DIGIT_SIZE_B));
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return 0;
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}
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