/// @file rainbow_keypair.c /// @brief implementations of functions in rainbow_keypair.h /// #include "blas.h" #include "blas_comm.h" #include "rainbow_blas.h" #include "rainbow_keypair.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 ) { PQCLEAN_RAINBOWIACYCLICCOMPRESSED_CLEAN_prng_gen( prng0, s_and_t, _O1_BYTE * _O2 ); // S1 s_and_t += _O1_BYTE * _O2; PQCLEAN_RAINBOWIACYCLICCOMPRESSED_CLEAN_prng_gen( prng0, s_and_t, _V1_BYTE * _O1 ); // T1 s_and_t += _V1_BYTE * _O1; PQCLEAN_RAINBOWIACYCLICCOMPRESSED_CLEAN_prng_gen( prng0, s_and_t, _V1_BYTE * _O2 ); // T2 s_and_t += _V1_BYTE * _O2; PQCLEAN_RAINBOWIACYCLICCOMPRESSED_CLEAN_prng_gen( prng0, s_and_t, _O1_BYTE * _O2 ); // T3 } static unsigned generate_l1_F12( unsigned char *sk, prng_t *prng0 ) { unsigned n_byte_generated = 0; PQCLEAN_RAINBOWIACYCLICCOMPRESSED_CLEAN_prng_gen( prng0, sk, _O1_BYTE * N_TRIANGLE_TERMS(_V1) ); // l1_F1 sk += _O1_BYTE * N_TRIANGLE_TERMS(_V1); n_byte_generated += _O1_BYTE * N_TRIANGLE_TERMS(_V1); PQCLEAN_RAINBOWIACYCLICCOMPRESSED_CLEAN_prng_gen( prng0, sk, _O1_BYTE * _V1 * _O1 ); // l1_F2 n_byte_generated += _O1_BYTE * _V1 * _O1; return n_byte_generated; } static unsigned generate_l2_F12356( unsigned char *sk, prng_t *prng0 ) { unsigned n_byte_generated = 0; PQCLEAN_RAINBOWIACYCLICCOMPRESSED_CLEAN_prng_gen( prng0, sk, _O2_BYTE * N_TRIANGLE_TERMS(_V1) ); // l2_F1 sk += _O2_BYTE * N_TRIANGLE_TERMS(_V1); n_byte_generated += _O2_BYTE * N_TRIANGLE_TERMS(_V1); PQCLEAN_RAINBOWIACYCLICCOMPRESSED_CLEAN_prng_gen( prng0, sk, _O2_BYTE * _V1 * _O1 ); // l2_F2 sk += _O2_BYTE * _V1 * _O1; n_byte_generated += _O2_BYTE * _V1 * _O1; PQCLEAN_RAINBOWIACYCLICCOMPRESSED_CLEAN_prng_gen( prng0, sk, _O2_BYTE * _V1 * _O2 ); // l2_F3 sk += _O2_BYTE * _V1 * _O1; n_byte_generated += _O2_BYTE * _V1 * _O1; PQCLEAN_RAINBOWIACYCLICCOMPRESSED_CLEAN_prng_gen( prng0, sk, _O2_BYTE * N_TRIANGLE_TERMS(_O1) ); // l2_F5 sk += _O2_BYTE * N_TRIANGLE_TERMS(_O1); n_byte_generated += _O2_BYTE * N_TRIANGLE_TERMS(_O1); PQCLEAN_RAINBOWIACYCLICCOMPRESSED_CLEAN_prng_gen( prng0, sk, _O2_BYTE * _O1 * _O2 ); // l2_F6 n_byte_generated += _O2_BYTE * _O1 * _O2; 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 i = 0; i < _O2; i++) { /// t3 width gfmat_prod( temp, t1, _V1_BYTE, _O1, t3 ); 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 n_terms, const unsigned char *s1 ) { unsigned char temp[_O1_BYTE + 32]; while ( n_terms-- ) { gfmat_prod( temp, s1, _O1_BYTE, _O2, l2_polys ); gf256v_add( l1_polys, temp, _O1_BYTE ); l1_polys += _O1_BYTE; l2_polys += _O2_BYTE; } } /////////////////// Classic ////////////////////////////////// ///////////////////// Cyclic ////////////////////////////////// void PQCLEAN_RAINBOWIACYCLICCOMPRESSED_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_RAINBOWIACYCLICCOMPRESSED_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_RAINBOWIACYCLICCOMPRESSED_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_RAINBOWIACYCLICCOMPRESSED_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_RAINBOWIACYCLICCOMPRESSED_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_RAINBOWIACYCLICCOMPRESSED_CLEAN_generate_compact_keypair_cyclic( cpk_t *pk, csk_t *rsk, const unsigned char *pk_seed, const unsigned char *sk_seed ) { memcpy( rsk->pk_seed, pk_seed, LEN_PKSEED ); memcpy( rsk->sk_seed, sk_seed, LEN_SKSEED ); sk_t sk; PQCLEAN_RAINBOWIACYCLICCOMPRESSED_CLEAN_generate_keypair_cyclic( pk, &sk, pk_seed, sk_seed ); } void PQCLEAN_RAINBOWIACYCLICCOMPRESSED_CLEAN_generate_secretkey_cyclic( sk_t *sk, const unsigned char *pk_seed, const unsigned char *sk_seed ) { memcpy( sk->sk_seed, sk_seed, LEN_SKSEED ); // prng for sk prng_t prng0; PQCLEAN_RAINBOWIACYCLICCOMPRESSED_CLEAN_prng_set( &prng0, sk_seed, LEN_SKSEED ); generate_S_T( sk->s1, &prng0 ); calculate_t4( sk->t4, sk->t1, sk->t3 ); // prng for pk sk_t inst_Qs; sk_t *Qs = &inst_Qs; prng_t prng1; PQCLEAN_RAINBOWIACYCLICCOMPRESSED_CLEAN_prng_set( &prng1, pk_seed, LEN_PKSEED ); generate_B1_B2( Qs->l1_F1, &prng1 ); 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 ); // calcuate the parts of sk according to pk. PQCLEAN_RAINBOWIACYCLICCOMPRESSED_CLEAN_calculate_F_from_Q( sk, Qs, sk ); // clean prng for sk memset( &prng0, 0, sizeof(prng_t) ); } void PQCLEAN_RAINBOWIACYCLICCOMPRESSED_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_RAINBOWIACYCLICCOMPRESSED_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_RAINBOWIACYCLICCOMPRESSED_CLEAN_extcpk_to_pk( rpk, &pk ); }