uint8_t dsa_verify_message(const dsa_signature_t* s, const void* m, uint16_t m_len_b, const hfdesc_t* hash_desc, const dsa_ctx_t* ctx) { bigint_t z; uint8_t n_B = ctx->domain.q.length_B; uint8_t hash_value[(hfal_hash_getHashsize(hash_desc)+7)/8]; hfal_hash_mem(hash_desc, hash_value, m, m_len_b); z.wordv=hash_value; z.length_B=n_B; bigint_changeendianess(&z); bigint_adjust(&z); return dsa_verify_bigint(s, &z, ctx); }
void hfal_test(const hfdesc_t* hd, const void* msg, uint32_t length_b){ if(hd->type!=HFDESC_TYPE_HASHFUNCTION) return; uint16_t dlen = (hd->hashsize_b+7)/8; uint8_t digest[dlen]; cli_putstr("\r\n=== "); cli_putstr(hd->name); cli_putstr(" ===\r\n message:"); cli_hexdump_block(msg, (length_b+7)/8, 4, 16); hfal_hash_mem(hd, digest, msg, length_b); cli_putstr(" \r\n digest:"); cli_hexdump_block(digest, dlen, 4, 16); cli_putstr("\r\n"); }
void hfal_test(const hfdesc_t *hd, void *msg, uint32_t length_b){ if(pgm_read_byte(&(hd->type))!=HFDESC_TYPE_HASHFUNCTION) return; uint16_t dlen = (pgm_read_word(&(hd->hashsize_b))+7)/8; uint8_t digest[dlen]; cli_putstr_P(PSTR("\r\n=== ")); cli_putstr_P((void*)pgm_read_word(&(hd->name))); cli_putstr_P(PSTR(" ===\r\n message:")); cli_hexdump_block(msg, (length_b+7)/8, 4, 16); hfal_hash_mem(hd, digest, msg, length_b); cli_putstr_P(PSTR(" \r\n digest:")); cli_hexdump_block(digest, dlen, 4, 16); cli_putstr_P(PSTR("\r\n")); }
void shavs_test3(void){ /* Monte Carlo tests for SHA-3 */ uint16_t expected_input; uint16_t count; uint8_t v; uint8_t index=0; char c; if(!shavs_algo){ cli_putstr("\r\nERROR: select algorithm first!"); return; } uint8_t ml=shavs_algo->hashsize_b/8; uint8_t m[ml+128]; for(;;){ while((c=cli_getc_cecho())!='S' && c!='s'){ if(!isblank((uint8_t)c)){ cli_putstr("\r\nERROR: wrong input (1) [0x"); cli_hexdump(&c, 1); cli_putstr("]!\r\n"); return; } } if((c=cli_getc_cecho())!='e' && c!='E'){ cli_putstr("\r\nERROR: wrong input (2)!\r\n"); return; } if((c=cli_getc_cecho())!='e' && c!='E'){ cli_putstr("\r\nERROR: wrong input (3)!\r\n"); return; } if((c=cli_getc_cecho())!='d' && c!='D'){ cli_putstr("\r\nERROR: wrong input (4)!\r\n"); return; } while((c=cli_getc_cecho())!='='){ if(!isblank((uint8_t)c)){ cli_putstr("\r\nERROR: wrong input (5)!\r\n"); return; } } expected_input = 1024/4; memset(m+ml, 0, 1024/8); do{ v=0xff; c=cli_getc_cecho(); if(c>='0' && c<='9'){ v = c - '0'; }else{ c |= 'A'^'a'; if(c>='a' && c<='f'){ v = c - 'a' +10; } } if(v<0x10){ c=m[ml+index/2]; if(index&1){ c |= v; }else{ c |=v<<4; } m[ml+index/2]=c; index++; expected_input--; } }while(expected_input); /* so we have the seed */ cli_putstr("\r\nstarting processing"); uint16_t j; for(count=0; count<100; ++count){ for(j=0; j<1000; ++j){ hfal_hash_mem(shavs_algo, m, m+ml, 1024); memmove(m+ml, m, 1024/8); } cli_putstr("\r\n\r\nj = "); if(count>=10){ cli_putc(count/10+'0'); } cli_putc(count%10+'0'); cli_putstr("\r\nMD = "); cli_hexdump(m+ml, ml); } } }
uint8_t rsa_encrypt_oaep(void* dest, uint16_t* out_length, const void* src, uint16_t length_B, rsa_publickey_t* key, const rsa_oaep_parameter_t *p, const rsa_label_t* label, const void* seed){ if(!p){ p = &rsa_oaep_default_parameter; } if(!label){ label = &rsa_oaep_default_label; } uint16_t hv_len = (hfal_hash_getHashsize(p->hf)+7)/8; if(length_B > bigint_length_B(&key->modulus) - 2*hv_len - 2){ /* message too long */ return 1; } uint16_t buffer_len = bigint_length_B(&key->modulus); #if DEBUG cli_putstr("\r\n buffer_len = "); cli_hexdump_rev(&buffer_len, 2); cli_putstr("\r\n modulus_len = "); cli_hexdump_rev(&key->modulus.length_B, 2); #endif uint8_t* buffer = (uint8_t*)dest; uint8_t off; /* the following needs some explanation: * off is the offset which is used for compensating the effect of * changeendian() when it operates on multi-byte words. * */ off = (sizeof(bigint_word_t) - (bigint_get_first_set_bit(&key->modulus)/8+1) % sizeof(bigint_word_t)) % (sizeof(bigint_word_t)); buffer += off; buffer_len -= off; uint8_t* seed_buffer = buffer + 1; uint16_t db_len = buffer_len - hv_len - 1; uint8_t* db = seed_buffer + hv_len; uint16_t maskbuffer_len = db_len>hv_len?db_len:hv_len; uint8_t maskbuffer[maskbuffer_len]; bigint_t x; memset(dest, 0, seed_buffer - buffer + off); memset(db + hv_len, 0, db_len - hv_len - length_B -1); hfal_hash_mem(p->hf, db, label->label, label->length_b); db[db_len - length_B - 1] = 0x01; memcpy(db+db_len - length_B, src, length_B); if(seed){ memcpy(seed_buffer, seed, hv_len); }else{ /* generate random seed */ if(!prng_get_byte){ return 2; /* ERROR: no random generator specified */ } uint16_t i; for(i=0; i<hv_len; ++i){ seed_buffer[i] = prng_get_byte(); } } #if DEBUG cli_putstr("\r\n msg (raw, pre-feistel):\r\n"); cli_hexdump_block(dest, bigint_length_B(&key->modulus), 4, 16); #endif p->mgf(maskbuffer, seed_buffer, hv_len, db_len, p->mgf_parameter); memxor(db, maskbuffer, db_len); p->mgf(maskbuffer, db, db_len, hv_len, p->mgf_parameter); memxor(seed_buffer, maskbuffer, hv_len); #if DEBUG cli_putstr("\r\n msg (raw, post-feistel):\r\n"); cli_hexdump_block(dest, bigint_length_B(&key->modulus), 4, 16); #endif x.info = 0; x.length_B = key->modulus.length_B; x.wordv = dest; bigint_adjust(&x); rsa_os2ip(&x, NULL, bigint_length_B(&key->modulus)); #if DEBUG cli_putstr("\r\ninput-msg (pre enc):\r\n"); cli_hexdump_rev(&src, 2); cli_hexdump_block(src, length_B, 4, 16); #endif rsa_enc(&x, key); #if DEBUG cli_putstr("\r\ninput-msg (post enc):\r\n"); cli_hexdump_rev(&src, 2); cli_hexdump_block(src, length_B, 4, 16); #endif rsa_i2osp(NULL, &x, out_length); return 0; }
uint8_t rsa_decrypt_oaep(void* dest, uint16_t* out_length, const void* src, uint16_t length_B, rsa_privatekey_t* key, const rsa_oaep_parameter_t *p, const rsa_label_t* label, void* seed){ // cli_putstr("\r\n -->rsa_decrypt_oaep()"); uart_flush(0); if(!label){ label = &rsa_oaep_default_label; } if(!p){ p = &rsa_oaep_default_parameter; } uint16_t x_len, data_len; bigint_t x; uint16_t hv_len = hfal_hash_getHashsize(p->hf)/8; uint8_t label_hv[hv_len]; uint16_t msg_len = bigint_get_first_set_bit(&key->modulus) / 8 + 1; uint16_t db_len = msg_len - hv_len - 1; uint8_t maskbuffer[db_len>hv_len?db_len:hv_len]; uint8_t *seed_buffer = dest; uint8_t *db_buffer = seed_buffer + hv_len; x_len = bigint_get_first_set_bit(&key->modulus)/8; memset(dest, 0, bigint_length_B(&key->modulus) - length_B); memcpy((uint8_t*)dest + bigint_length_B(&key->modulus) - length_B, src, length_B); // cli_putc('a'); uart_flush(0); x.wordv = dest; x.length_B = key->modulus.length_B; x.info = 0; bigint_adjust(&x); // cli_putc('b'); uart_flush(0); rsa_os2ip(&x, NULL, bigint_length_B(&key->modulus)); #if DEBUG cli_putstr_P(PSTR("\r\n rsa decrypting ...")); #endif rsa_dec(&x, key); #if DEBUG cli_putstr_P(PSTR(" [done]")); #endif rsa_i2osp(NULL, &x, &data_len); // cli_putstr("\r\n msg (raw, pre-move):\r\n"); // cli_hexdump_block(dest, bigint_length_B(key->modulus), 4, 16); if(data_len > x_len){ return 7; } /* cli_putstr("\r\n moving some bytes; x_len = "); cli_hexdump_rev(&x_len, 2); cli_putstr(" data_len = "); cli_hexdump_rev(&data_len, 2); uart_flush(0); */ if(x_len != data_len){ memmove((uint8_t*)dest + x_len - data_len, dest, data_len); // cli_putstr(" (oh, not dead yet?!)"); // uart_flush(0); memset(dest, 0, x_len - data_len); } hfal_hash_mem(p->hf, label_hv, label->label, label->length_b); /* cli_putstr("\r\n msg (raw, pre-feistel):\r\n"); cli_hexdump_block(seed_buffer, bigint_length_B(key->modulus), 4, 16); uart_flush(0); */ p->mgf(maskbuffer, db_buffer, db_len, hv_len, p->mgf_parameter); memxor(seed_buffer, maskbuffer, hv_len); p->mgf(maskbuffer, seed_buffer, hv_len, db_len, p->mgf_parameter); memxor(db_buffer, maskbuffer, db_len); if(memcmp(label_hv, db_buffer, hv_len)){ // cli_putstr("\r\nDBG: DB:\r\n"); // cli_hexdump_block(db_buffer, db_len, 4, 16); return 2; } uint16_t ps_len=0; while(db_buffer[hv_len + ps_len++] == 0) ; --ps_len; if(db_buffer[hv_len + ps_len] != 1){ return 3; } if(seed){ memcpy(seed, seed_buffer, hv_len); } msg_len = db_len - hv_len - 1 - ps_len; memmove(dest, db_buffer + hv_len + ps_len + 1, msg_len); *out_length = msg_len; return 0; }