/// @file rainbow_keypair.c /// @brief implementations of functions in rainbow_keypair.h /// #include "rainbow_keypair.h" #include "blas.h" #include "blas_comm.h" #include "rainbow_blas.h" #include "rainbow_keypair_computation.h" #include "utils_prng.h" #include #include #include static void generate_S_T( unsigned char *s_and_t, prng_t *prng0 ) { sk_t *_sk; unsigned size; size = sizeof(_sk->s1); PQCLEAN_RAINBOWVCIRCUMZENITHAL_CLEAN_prng_gen( prng0, s_and_t, size ); s_and_t += size; size = sizeof(_sk->t1); PQCLEAN_RAINBOWVCIRCUMZENITHAL_CLEAN_prng_gen( prng0, s_and_t, size ); s_and_t += size; size = sizeof(_sk->t4); PQCLEAN_RAINBOWVCIRCUMZENITHAL_CLEAN_prng_gen( prng0, s_and_t, size ); s_and_t += size; size = sizeof(_sk->t3); PQCLEAN_RAINBOWVCIRCUMZENITHAL_CLEAN_prng_gen( prng0, s_and_t, size ); } static unsigned generate_l1_F12( unsigned char *sk, prng_t *prng0 ) { unsigned n_byte_generated = 0; sk_t *_sk; unsigned size; size = sizeof(_sk->l1_F1); PQCLEAN_RAINBOWVCIRCUMZENITHAL_CLEAN_prng_gen( prng0, sk, size ); sk += size; n_byte_generated += size; size = sizeof(_sk->l1_F2); PQCLEAN_RAINBOWVCIRCUMZENITHAL_CLEAN_prng_gen( prng0, sk, size ); n_byte_generated += size; return n_byte_generated; } static unsigned generate_l2_F12356( unsigned char *sk, prng_t *prng0 ) { unsigned n_byte_generated = 0; sk_t *_sk; unsigned size; size = sizeof(_sk->l2_F1); PQCLEAN_RAINBOWVCIRCUMZENITHAL_CLEAN_prng_gen( prng0, sk, size ); sk += size; n_byte_generated += size; size = sizeof(_sk->l2_F2); PQCLEAN_RAINBOWVCIRCUMZENITHAL_CLEAN_prng_gen( prng0, sk, size ); sk += size; n_byte_generated += size; size = sizeof(_sk->l2_F3); PQCLEAN_RAINBOWVCIRCUMZENITHAL_CLEAN_prng_gen( prng0, sk, size ); sk += size; n_byte_generated += size; size = sizeof(_sk->l2_F5); PQCLEAN_RAINBOWVCIRCUMZENITHAL_CLEAN_prng_gen( prng0, sk, size ); sk += size; n_byte_generated += size; size = sizeof(_sk->l2_F6); PQCLEAN_RAINBOWVCIRCUMZENITHAL_CLEAN_prng_gen( prng0, sk, size ); n_byte_generated += size; return n_byte_generated; } static void generate_B1_B2(unsigned char *sk, prng_t *prng0) { sk += generate_l1_F12(sk, prng0); generate_l2_F12356(sk, prng0); } static void calculate_t4(unsigned char *t2_to_t4, const unsigned char *t1, const unsigned char *t3) { // t4 = T_sk.t1 * T_sk.t3 - T_sk.t2 unsigned char temp[_V1_BYTE + 32]; unsigned char *t4 = t2_to_t4; for (unsigned int i = 0; i < _O2; i++) { /// t3 width gfmat_prod(temp, t1, _V1_BYTE, _O1, t3); PQCLEAN_RAINBOWVCIRCUMZENITHAL_CLEAN_gf256v_add(t4, temp, _V1_BYTE); t4 += _V1_BYTE; t3 += _O1_BYTE; } } static void obsfucate_l1_polys(unsigned char *l1_polys, const unsigned char *l2_polys, unsigned int n_terms, const unsigned char *s1) { unsigned char temp[_O1_BYTE + 32]; while (n_terms--) { gfmat_prod(temp, s1, _O1_BYTE, _O2, l2_polys); PQCLEAN_RAINBOWVCIRCUMZENITHAL_CLEAN_gf256v_add(l1_polys, temp, _O1_BYTE); l1_polys += _O1_BYTE; l2_polys += _O2_BYTE; } } /////////////////// Classic ////////////////////////////////// ///////////////////// Cyclic ////////////////////////////////// void PQCLEAN_RAINBOWVCIRCUMZENITHAL_CLEAN_generate_keypair_cyclic(cpk_t *pk, sk_t *sk, const unsigned char *pk_seed, const unsigned char *sk_seed) { memcpy(pk->pk_seed, pk_seed, LEN_PKSEED); memcpy(sk->sk_seed, sk_seed, LEN_SKSEED); // prng for sk prng_t prng; prng_t *prng0 = &prng; PQCLEAN_RAINBOWVCIRCUMZENITHAL_CLEAN_prng_set(prng0, sk_seed, LEN_SKSEED); generate_S_T(sk->s1, prng0); // S,T: only a part of sk unsigned char t2[sizeof(sk->t4)]; memcpy(t2, sk->t4, _V1_BYTE * _O2); // temporarily store t2 calculate_t4(sk->t4, sk->t1, sk->t3); // t2 <- t4 // prng for pk sk_t inst_Qs; sk_t *Qs = &inst_Qs; prng_t *prng1 = &prng; PQCLEAN_RAINBOWVCIRCUMZENITHAL_CLEAN_prng_set(prng1, pk_seed, LEN_PKSEED); generate_B1_B2(Qs->l1_F1, prng1); // generating l1_Q1, l1_Q2, l2_Q1, l2_Q2, l2_Q3, l2_Q5, l2_Q6 obsfucate_l1_polys(Qs->l1_F1, Qs->l2_F1, N_TRIANGLE_TERMS(_V1), sk->s1); obsfucate_l1_polys(Qs->l1_F2, Qs->l2_F2, _V1 * _O1, sk->s1); // so far, the Qs contains l1_F1, l1_F2, l2_F1, l2_F2, l2_F3, l2_F5, l2_F6. PQCLEAN_RAINBOWVCIRCUMZENITHAL_CLEAN_calculate_F_from_Q(sk, Qs, sk); // calcuate the rest parts of secret key from Qs and S,T unsigned char t4[sizeof(sk->t4)]; memcpy(t4, sk->t4, _V1_BYTE * _O2); // temporarily store t4 memcpy(sk->t4, t2, _V1_BYTE * _O2); // restore t2 PQCLEAN_RAINBOWVCIRCUMZENITHAL_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 memcpy(sk->t4, t4, _V1_BYTE * _O2); // restore t4 obsfucate_l1_polys(pk->l1_Q3, Qs->l2_F3, _V1 * _O2, sk->s1); obsfucate_l1_polys(pk->l1_Q5, Qs->l2_F5, N_TRIANGLE_TERMS(_O1), sk->s1); obsfucate_l1_polys(pk->l1_Q6, Qs->l2_F6, _O1 * _O2, sk->s1); obsfucate_l1_polys(pk->l1_Q9, pk->l2_Q9, N_TRIANGLE_TERMS(_O2), sk->s1); // clean memset(&prng, 0, sizeof(prng_t)); } void PQCLEAN_RAINBOWVCIRCUMZENITHAL_CLEAN_cpk_to_pk(pk_t *rpk, const cpk_t *cpk) { // procedure: cpk_t --> extcpk_t --> pk_t // convert from cpk_t to extcpk_t ext_cpk_t pk; // setup prng prng_t prng0; PQCLEAN_RAINBOWVCIRCUMZENITHAL_CLEAN_prng_set(&prng0, cpk->pk_seed, LEN_SKSEED); // generating parts of key with prng generate_l1_F12(pk.l1_Q1, &prng0); // copying parts of key from input. l1_Q3, l1_Q5, l1_Q6, l1_Q9 memcpy(pk.l1_Q3, cpk->l1_Q3, _O1_BYTE * (_V1 * _O2 + N_TRIANGLE_TERMS(_O1) + _O1 * _O2 + N_TRIANGLE_TERMS(_O2))); // generating parts of key with prng generate_l2_F12356(pk.l2_Q1, &prng0); // copying parts of key from input: l2_Q9 memcpy(pk.l2_Q9, cpk->l2_Q9, _O2_BYTE * N_TRIANGLE_TERMS(_O2)); // convert from extcpk_t to pk_t PQCLEAN_RAINBOWVCIRCUMZENITHAL_CLEAN_extcpk_to_pk(rpk, &pk); }