158 lines
6.0 KiB
C
158 lines
6.0 KiB
C
/// @file rainbow_keypair.c
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/// @brief implementations of functions in rainbow_keypair.h
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///
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#include "rainbow_keypair.h"
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#include "blas.h"
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#include "blas_comm.h"
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#include "rainbow_blas.h"
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#include "rainbow_keypair_computation.h"
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#include "utils_prng.h"
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#include <stdint.h>
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#include <stdlib.h>
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#include <string.h>
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static void generate_S_T(unsigned char *s_and_t, prng_t *prng0) {
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PQCLEAN_RAINBOWVCCYCLIC_CLEAN_prng_gen(prng0, s_and_t, _O1_BYTE * _O2); // S1
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s_and_t += _O1_BYTE * _O2;
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PQCLEAN_RAINBOWVCCYCLIC_CLEAN_prng_gen(prng0, s_and_t, _V1_BYTE * _O1); // T1
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s_and_t += _V1_BYTE * _O1;
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PQCLEAN_RAINBOWVCCYCLIC_CLEAN_prng_gen(prng0, s_and_t, _V1_BYTE * _O2); // T2
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s_and_t += _V1_BYTE * _O2;
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PQCLEAN_RAINBOWVCCYCLIC_CLEAN_prng_gen(prng0, s_and_t, _O1_BYTE * _O2); // T3
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}
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static unsigned generate_l1_F12(unsigned char *sk, prng_t *prng0) {
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unsigned n_byte_generated = 0;
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PQCLEAN_RAINBOWVCCYCLIC_CLEAN_prng_gen(prng0, sk, _O1_BYTE * N_TRIANGLE_TERMS(_V1)); // l1_F1
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sk += _O1_BYTE * N_TRIANGLE_TERMS(_V1);
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n_byte_generated += _O1_BYTE * N_TRIANGLE_TERMS(_V1);
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PQCLEAN_RAINBOWVCCYCLIC_CLEAN_prng_gen(prng0, sk, _O1_BYTE * _V1 * _O1); // l1_F2
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n_byte_generated += _O1_BYTE * _V1 * _O1;
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return n_byte_generated;
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}
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static unsigned generate_l2_F12356(unsigned char *sk, prng_t *prng0) {
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unsigned n_byte_generated = 0;
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PQCLEAN_RAINBOWVCCYCLIC_CLEAN_prng_gen(prng0, sk, _O2_BYTE * N_TRIANGLE_TERMS(_V1)); // l2_F1
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sk += _O2_BYTE * N_TRIANGLE_TERMS(_V1);
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n_byte_generated += _O2_BYTE * N_TRIANGLE_TERMS(_V1);
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PQCLEAN_RAINBOWVCCYCLIC_CLEAN_prng_gen(prng0, sk, _O2_BYTE * _V1 * _O1); // l2_F2
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sk += _O2_BYTE * _V1 * _O1;
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n_byte_generated += _O2_BYTE * _V1 * _O1;
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PQCLEAN_RAINBOWVCCYCLIC_CLEAN_prng_gen(prng0, sk, _O2_BYTE * _V1 * _O2); // l2_F3
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sk += _O2_BYTE * _V1 * _O1;
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n_byte_generated += _O2_BYTE * _V1 * _O1;
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PQCLEAN_RAINBOWVCCYCLIC_CLEAN_prng_gen(prng0, sk, _O2_BYTE * N_TRIANGLE_TERMS(_O1)); // l2_F5
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sk += _O2_BYTE * N_TRIANGLE_TERMS(_O1);
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n_byte_generated += _O2_BYTE * N_TRIANGLE_TERMS(_O1);
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PQCLEAN_RAINBOWVCCYCLIC_CLEAN_prng_gen(prng0, sk, _O2_BYTE * _O1 * _O2); // l2_F6
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n_byte_generated += _O2_BYTE * _O1 * _O2;
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return n_byte_generated;
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}
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static void generate_B1_B2(unsigned char *sk, prng_t *prng0) {
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sk += generate_l1_F12(sk, prng0);
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generate_l2_F12356(sk, prng0);
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}
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static void calculate_t4(unsigned char *t2_to_t4, const unsigned char *t1, const unsigned char *t3) {
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// t4 = T_sk.t1 * T_sk.t3 - T_sk.t2
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unsigned char temp[_V1_BYTE + 32];
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unsigned char *t4 = t2_to_t4;
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for (unsigned i = 0; i < _O2; i++) { /// t3 width
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gfmat_prod(temp, t1, _V1_BYTE, _O1, t3);
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gf256v_add(t4, temp, _V1_BYTE);
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t4 += _V1_BYTE;
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t3 += _O1_BYTE;
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}
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}
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static void obsfucate_l1_polys(unsigned char *l1_polys, const unsigned char *l2_polys, unsigned n_terms, const unsigned char *s1) {
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unsigned char temp[_O1_BYTE + 32];
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while (n_terms--) {
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gfmat_prod(temp, s1, _O1_BYTE, _O2, l2_polys);
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gf256v_add(l1_polys, temp, _O1_BYTE);
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l1_polys += _O1_BYTE;
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l2_polys += _O2_BYTE;
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}
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}
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/////////////////// Classic //////////////////////////////////
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///////////////////// Cyclic //////////////////////////////////
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void PQCLEAN_RAINBOWVCCYCLIC_CLEAN_generate_keypair_cyclic(cpk_t *pk, sk_t *sk, const unsigned char *pk_seed, const unsigned char *sk_seed) {
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memcpy(pk->pk_seed, pk_seed, LEN_PKSEED);
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memcpy(sk->sk_seed, sk_seed, LEN_SKSEED);
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// prng for sk
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prng_t prng;
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prng_t *prng0 = &prng;
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PQCLEAN_RAINBOWVCCYCLIC_CLEAN_prng_set(prng0, sk_seed, LEN_SKSEED);
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generate_S_T(sk->s1, prng0); // S,T: only a part of sk
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unsigned char t2[sizeof(sk->t4)];
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memcpy(t2, sk->t4, _V1_BYTE * _O2); // temporarily store t2
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calculate_t4(sk->t4, sk->t1, sk->t3); // t2 <- t4
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// prng for pk
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sk_t inst_Qs;
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sk_t *Qs = &inst_Qs;
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prng_t *prng1 = &prng;
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PQCLEAN_RAINBOWVCCYCLIC_CLEAN_prng_set(prng1, pk_seed, LEN_PKSEED);
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generate_B1_B2(Qs->l1_F1, prng1); // generating l1_Q1, l1_Q2, l2_Q1, l2_Q2, l2_Q3, l2_Q5, l2_Q6
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obsfucate_l1_polys(Qs->l1_F1, Qs->l2_F1, N_TRIANGLE_TERMS(_V1), sk->s1);
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obsfucate_l1_polys(Qs->l1_F2, Qs->l2_F2, _V1 * _O1, sk->s1);
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// so far, the Qs contains l1_F1, l1_F2, l2_F1, l2_F2, l2_F3, l2_F5, l2_F6.
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PQCLEAN_RAINBOWVCCYCLIC_CLEAN_calculate_F_from_Q(sk, Qs, sk); // calcuate the rest parts of secret key from Qs and S,T
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unsigned char t4[sizeof(sk->t4)];
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memcpy(t4, sk->t4, _V1_BYTE * _O2); // temporarily store t4
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memcpy(sk->t4, t2, _V1_BYTE * _O2); // restore t2
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PQCLEAN_RAINBOWVCCYCLIC_CLEAN_calculate_Q_from_F_cyclic(pk, sk, sk); // calculate the rest parts of public key: l1_Q3, l1_Q5, l1_Q6, l1_Q9, l2_Q9
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memcpy(sk->t4, t4, _V1_BYTE * _O2); // restore t4
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obsfucate_l1_polys(pk->l1_Q3, Qs->l2_F3, _V1 * _O2, sk->s1);
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obsfucate_l1_polys(pk->l1_Q5, Qs->l2_F5, N_TRIANGLE_TERMS(_O1), sk->s1);
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obsfucate_l1_polys(pk->l1_Q6, Qs->l2_F6, _O1 * _O2, sk->s1);
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obsfucate_l1_polys(pk->l1_Q9, pk->l2_Q9, N_TRIANGLE_TERMS(_O2), sk->s1);
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// clean
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memset(&prng, 0, sizeof(prng_t));
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}
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void PQCLEAN_RAINBOWVCCYCLIC_CLEAN_cpk_to_pk(pk_t *rpk, const cpk_t *cpk) {
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// procedure: cpk_t --> extcpk_t --> pk_t
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// convert from cpk_t to extcpk_t
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ext_cpk_t pk;
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// setup prng
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prng_t prng0;
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PQCLEAN_RAINBOWVCCYCLIC_CLEAN_prng_set(&prng0, cpk->pk_seed, LEN_SKSEED);
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// generating parts of key with prng
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generate_l1_F12(pk.l1_Q1, &prng0);
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// copying parts of key from input. l1_Q3, l1_Q5, l1_Q6, l1_Q9
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memcpy(pk.l1_Q3, cpk->l1_Q3, _O1_BYTE * (_V1 * _O2 + N_TRIANGLE_TERMS(_O1) + _O1 * _O2 + N_TRIANGLE_TERMS(_O2)));
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// generating parts of key with prng
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generate_l2_F12356(pk.l2_Q1, &prng0);
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// copying parts of key from input: l2_Q9
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memcpy(pk.l2_Q9, cpk->l2_Q9, _O2_BYTE * N_TRIANGLE_TERMS(_O2));
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// convert from extcpk_t to pk_t
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PQCLEAN_RAINBOWVCCYCLIC_CLEAN_extcpk_to_pk(rpk, &pk);
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}
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