180 lines
6.0 KiB
C
180 lines
6.0 KiB
C
#include "nistseedexpander.h"
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#include "parameters.h"
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#include "parsing.h"
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#include "randombytes.h"
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#include "vector.h"
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#include <stdint.h>
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#include <string.h>
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/**
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* @file parsing.c
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* @brief Functions to parse secret key, public key and ciphertext of the HQC scheme
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*/
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void PQCLEAN_HQCRMRS256_CLEAN_store8(unsigned char *out, uint64_t in) {
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out[0] = (in >> 0x00) & 0xFF;
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out[1] = (in >> 0x08) & 0xFF;
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out[2] = (in >> 0x10) & 0xFF;
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out[3] = (in >> 0x18) & 0xFF;
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out[4] = (in >> 0x20) & 0xFF;
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out[5] = (in >> 0x28) & 0xFF;
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out[6] = (in >> 0x30) & 0xFF;
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out[7] = (in >> 0x38) & 0xFF;
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}
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uint64_t PQCLEAN_HQCRMRS256_CLEAN_load8(const unsigned char *in) {
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uint64_t ret = in[7];
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for (int8_t i = 6; i >= 0; i--) {
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ret <<= 8;
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ret |= in[i];
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}
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return ret;
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}
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void PQCLEAN_HQCRMRS256_CLEAN_load8_arr(uint64_t *out64, size_t outlen, const uint8_t *in8, size_t inlen) {
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size_t index_in = 0;
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size_t index_out = 0;
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// first copy by 8 bytes
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if (inlen >= 8 && outlen >= 1) {
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while (index_out < outlen && index_in + 8 <= inlen) {
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out64[index_out] = PQCLEAN_HQCRMRS256_CLEAN_load8(in8 + index_in);
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index_in += 8;
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index_out += 1;
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}
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}
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// we now need to do the last 7 bytes if necessary
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if (index_in >= inlen || index_out >= outlen) {
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return;
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}
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out64[index_out] = in8[inlen - 1];
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for (int8_t i = (int8_t)(inlen - index_in) - 2; i >= 0; i--) {
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out64[index_out] <<= 8;
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out64[index_out] |= in8[index_in + i];
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}
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}
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void PQCLEAN_HQCRMRS256_CLEAN_store8_arr(uint8_t *out8, size_t outlen, const uint64_t *in64, size_t inlen) {
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for (size_t index_out = 0, index_in = 0; index_out < outlen && index_in < inlen;) {
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out8[index_out] = (in64[index_in] >> ((index_out % 8) * 8)) & 0xFF;
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index_out++;
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if (index_out % 8 == 0) {
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index_in++;
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}
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}
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}
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/**
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* @brief Parse a secret key into a string
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*
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* The secret key is composed of the seed used to generate vectors <b>x</b> and <b>y</b>.
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* As technicality, the public key is appended to the secret key in order to respect NIST API.
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*
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* @param[out] sk String containing the secret key
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* @param[in] sk_seed Seed used to generate the secret key
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* @param[in] pk String containing the public key
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*/
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void PQCLEAN_HQCRMRS256_CLEAN_hqc_secret_key_to_string(uint8_t *sk, const uint8_t *sk_seed, const uint8_t *pk) {
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memcpy(sk, sk_seed, SEED_BYTES);
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memcpy(sk + SEED_BYTES, pk, PUBLIC_KEY_BYTES);
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}
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/**
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* @brief Parse a secret key from a string
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*
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* The secret key is composed of the seed used to generate vectors <b>x</b> and <b>y</b>.
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* As technicality, the public key is appended to the secret key in order to respect NIST API.
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*
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* @param[out] x uint64_t representation of vector x
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* @param[out] y uint32_t representation of vector y
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* @param[out] pk String containing the public key
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* @param[in] sk String containing the secret key
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*/
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void PQCLEAN_HQCRMRS256_CLEAN_hqc_secret_key_from_string(uint64_t *x, uint32_t *y, uint8_t *pk, const uint8_t *sk) {
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AES_XOF_struct sk_seedexpander;
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uint8_t sk_seed[SEED_BYTES] = {0};
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memcpy(sk_seed, sk, SEED_BYTES);
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seedexpander_init(&sk_seedexpander, sk_seed, sk_seed + 32, SEEDEXPANDER_MAX_LENGTH);
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PQCLEAN_HQCRMRS256_CLEAN_vect_set_random_fixed_weight(&sk_seedexpander, x, PARAM_OMEGA);
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PQCLEAN_HQCRMRS256_CLEAN_vect_set_random_fixed_weight_by_coordinates(&sk_seedexpander, y, PARAM_OMEGA);
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memcpy(pk, sk + SEED_BYTES, PUBLIC_KEY_BYTES);
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}
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/**
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* @brief Parse a public key into a string
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*
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* The public key is composed of the syndrome <b>s</b> as well as the seed used to generate the vector <b>h</b>
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*
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* @param[out] pk String containing the public key
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* @param[in] pk_seed Seed used to generate the public key
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* @param[in] s uint8_t representation of vector s
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*/
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void PQCLEAN_HQCRMRS256_CLEAN_hqc_public_key_to_string(uint8_t *pk, const uint8_t *pk_seed, const uint64_t *s) {
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memcpy(pk, pk_seed, SEED_BYTES);
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memcpy(pk + SEED_BYTES, s, VEC_N_SIZE_BYTES);
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}
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/**
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* @brief Parse a public key from a string
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*
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* The public key is composed of the syndrome <b>s</b> as well as the seed used to generate the vector <b>h</b>
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*
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* @param[out] h uint8_t representation of vector h
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* @param[out] s uint8_t representation of vector s
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* @param[in] pk String containing the public key
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*/
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void PQCLEAN_HQCRMRS256_CLEAN_hqc_public_key_from_string(uint64_t *h, uint64_t *s, const uint8_t *pk) {
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AES_XOF_struct pk_seedexpander;
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uint8_t pk_seed[SEED_BYTES] = {0};
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memcpy(pk_seed, pk, SEED_BYTES);
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seedexpander_init(&pk_seedexpander, pk_seed, pk_seed + 32, SEEDEXPANDER_MAX_LENGTH);
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PQCLEAN_HQCRMRS256_CLEAN_vect_set_random(&pk_seedexpander, h);
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memcpy(s, pk + SEED_BYTES, VEC_N_SIZE_BYTES);
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}
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/**
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* @brief Parse a ciphertext into a string
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*
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* The ciphertext is composed of vectors <b>u</b>, <b>v</b> and hash <b>d</b>.
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*
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* @param[out] ct String containing the ciphertext
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* @param[in] u uint8_t representation of vector u
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* @param[in] v uint8_t representation of vector v
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* @param[in] d String containing the hash d
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*/
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void PQCLEAN_HQCRMRS256_CLEAN_hqc_ciphertext_to_string(uint8_t *ct, const uint64_t *u, const uint64_t *v, const uint8_t *d) {
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memcpy(ct, u, VEC_N_SIZE_BYTES);
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memcpy(ct + VEC_N_SIZE_BYTES, v, VEC_N1N2_SIZE_BYTES);
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memcpy(ct + VEC_N_SIZE_BYTES + VEC_N1N2_SIZE_BYTES, d, SHA512_BYTES);
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}
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/**
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* @brief Parse a ciphertext from a string
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*
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* The ciphertext is composed of vectors <b>u</b>, <b>v</b> and hash <b>d</b>.
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*
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* @param[out] u uint8_t representation of vector u
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* @param[out] v uint8_t representation of vector v
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* @param[out] d String containing the hash d
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* @param[in] ct String containing the ciphertext
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*/
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void PQCLEAN_HQCRMRS256_CLEAN_hqc_ciphertext_from_string(uint64_t *u, uint64_t *v, uint8_t *d, const uint8_t *ct) {
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memcpy(u, ct, VEC_N_SIZE_BYTES);
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memcpy(v, ct + VEC_N_SIZE_BYTES, VEC_N1N2_SIZE_BYTES);
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memcpy(d, ct + VEC_N_SIZE_BYTES + VEC_N1N2_SIZE_BYTES, SHA512_BYTES);
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}
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