427 lines
9.6 KiB
C
427 lines
9.6 KiB
C
/*
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* Copyright (c) 2016 Thomas Pornin <pornin@bolet.org>
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*
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* Permission is hereby granted, free of charge, to any person obtaining
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* a copy of this software and associated documentation files (the
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* "Software"), to deal in the Software without restriction, including
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* without limitation the rights to use, copy, modify, merge, publish,
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* distribute, sublicense, and/or sell copies of the Software, and to
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* permit persons to whom the Software is furnished to do so, subject to
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* the following conditions:
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*
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* The above copyright notice and this permission notice shall be
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* included in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
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* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
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* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <stdint.h>
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#include <errno.h>
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#include "brssl.h"
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#include "bearssl.h"
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static void
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print_int_text(const char *name, const unsigned char *buf, size_t len)
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{
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size_t u;
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printf("%s = ", name);
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for (u = 0; u < len; u ++) {
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printf("%02X", buf[u]);
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}
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printf("\n");
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}
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static void
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print_int_C(const char *name, const unsigned char *buf, size_t len)
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{
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size_t u;
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printf("\nstatic const unsigned char %s[] = {", name);
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for (u = 0; u < len; u ++) {
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if (u != 0) {
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printf(",");
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}
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if (u % 12 == 0) {
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printf("\n\t");
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} else {
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printf(" ");
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}
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printf("0x%02X", buf[u]);
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}
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printf("\n};\n");
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}
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static void
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print_rsa(const br_rsa_private_key *sk, int print_text, int print_C)
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{
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if (print_text) {
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print_int_text("p ", sk->p, sk->plen);
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print_int_text("q ", sk->q, sk->qlen);
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print_int_text("dp", sk->dp, sk->dplen);
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print_int_text("dq", sk->dq, sk->dqlen);
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print_int_text("iq", sk->iq, sk->iqlen);
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}
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if (print_C) {
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print_int_C("RSA_P", sk->p, sk->plen);
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print_int_C("RSA_Q", sk->q, sk->qlen);
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print_int_C("RSA_DP", sk->dp, sk->dplen);
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print_int_C("RSA_DQ", sk->dq, sk->dqlen);
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print_int_C("RSA_IQ", sk->iq, sk->iqlen);
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printf("\nstatic const br_rsa_private_key RSA = {\n");
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printf("\t%lu,\n", (unsigned long)sk->n_bitlen);
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printf("\t(unsigned char *)RSA_P, sizeof RSA_P,\n");
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printf("\t(unsigned char *)RSA_Q, sizeof RSA_Q,\n");
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printf("\t(unsigned char *)RSA_DP, sizeof RSA_DP,\n");
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printf("\t(unsigned char *)RSA_DQ, sizeof RSA_DQ,\n");
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printf("\t(unsigned char *)RSA_IQ, sizeof RSA_IQ\n");
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printf("};\n");
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}
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}
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static void
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print_ec(const br_ec_private_key *sk, int print_text, int print_C)
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{
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if (print_text) {
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print_int_text("x", sk->x, sk->xlen);
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}
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if (print_C) {
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print_int_C("EC_X", sk->x, sk->xlen);
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printf("\nstatic const br_ec_private_key EC = {\n");
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printf("\t%d,\n", sk->curve);
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printf("\t(unsigned char *)EC_X, sizeof EC_X\n");
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printf("};\n");
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}
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}
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static int
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parse_rsa_spec(const char *kgen_spec, unsigned *size, uint32_t *pubexp)
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{
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const char *p;
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char *end;
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unsigned long ul;
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p = kgen_spec;
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if (*p != 'r' && *p != 'R') {
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return 0;
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}
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p ++;
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if (*p != 's' && *p != 'S') {
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return 0;
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}
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p ++;
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if (*p != 'a' && *p != 'A') {
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return 0;
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}
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p ++;
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if (*p == 0) {
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*size = 2048;
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*pubexp = 3;
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return 1;
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} else if (*p != ':') {
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return 0;
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}
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p ++;
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ul = strtoul(p, &end, 10);
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if (ul < 512 || ul > 32768) {
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return 0;
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}
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*size = ul;
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p = end;
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if (*p == 0) {
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*pubexp = 3;
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return 1;
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} else if (*p != ':') {
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return 0;
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}
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p ++;
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ul = strtoul(p, &end, 10);
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if ((ul & 1) == 0 || ul == 1 || ((ul >> 30) >> 2) != 0) {
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return 0;
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}
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*pubexp = ul;
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if (*end != 0) {
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return 0;
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}
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return 1;
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}
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static int
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keygen_rsa(unsigned size, uint32_t pubexp, int print_text, int print_C)
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{
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br_hmac_drbg_context rng;
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br_prng_seeder seeder;
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br_rsa_keygen kg;
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br_rsa_private_key sk;
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unsigned char *kbuf_priv;
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uint32_t r;
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seeder = br_prng_seeder_system(NULL);
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if (seeder == 0) {
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fprintf(stderr, "ERROR: no system source of randomness\n");
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return 0;
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}
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br_hmac_drbg_init(&rng, &br_sha256_vtable, NULL, 0);
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if (!seeder(&rng.vtable)) {
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fprintf(stderr, "ERROR: system source of randomness failed\n");
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return 0;
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}
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kbuf_priv = xmalloc(BR_RSA_KBUF_PRIV_SIZE(size));
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kg = br_rsa_keygen_get_default();
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r = kg(&rng.vtable, &sk, kbuf_priv, NULL, NULL, size, pubexp);
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if (!r) {
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fprintf(stderr, "ERROR: RSA key pair generation failed\n");
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} else {
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print_rsa(&sk, print_text, print_C);
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}
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xfree(kbuf_priv);
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return r;
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}
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static int
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decode_key(const unsigned char *buf, size_t len, int print_text, int print_C)
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{
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br_skey_decoder_context dc;
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int err;
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br_skey_decoder_init(&dc);
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br_skey_decoder_push(&dc, buf, len);
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err = br_skey_decoder_last_error(&dc);
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if (err != 0) {
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const char *errname, *errmsg;
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fprintf(stderr, "ERROR (decoding): err=%d\n", err);
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errname = find_error_name(err, &errmsg);
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if (errname != NULL) {
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fprintf(stderr, " %s: %s\n", errname, errmsg);
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} else {
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fprintf(stderr, " (unknown)\n");
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}
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return -1;
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}
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switch (br_skey_decoder_key_type(&dc)) {
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const br_rsa_private_key *rk;
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const br_ec_private_key *ek;
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case BR_KEYTYPE_RSA:
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rk = br_skey_decoder_get_rsa(&dc);
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printf("RSA key (%lu bits)\n", (unsigned long)rk->n_bitlen);
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print_rsa(rk, print_text, print_C);
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break;
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case BR_KEYTYPE_EC:
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ek = br_skey_decoder_get_ec(&dc);
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printf("EC key (curve = %d: %s)\n",
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ek->curve, ec_curve_name(ek->curve));
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print_ec(ek, print_text, print_C);
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break;
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default:
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fprintf(stderr, "Unknown key type: %d\n",
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br_skey_decoder_key_type(&dc));
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return -1;
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}
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return 0;
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}
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static void
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usage_skey(void)
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{
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fprintf(stderr,
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"usage: brssl skey [ options ] file...\n");
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fprintf(stderr,
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"options:\n");
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fprintf(stderr,
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" -q suppress verbose messages\n");
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fprintf(stderr,
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" -text print public key details (human-readable)\n");
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fprintf(stderr,
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" -C print public key details (C code)\n");
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fprintf(stderr,
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" -gen spec generate a new key using the provided key specification\n");
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fprintf(stderr,
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"Key specification begins with a key type, followed by optional parameters\n");
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fprintf(stderr,
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"that depend on the key type, separated by colon characters:\n");
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fprintf(stderr,
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" rsa[:size[:pubexep]] RSA key (defaults: size = 2048, pubexp = 3)\n");
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}
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/* see brssl.h */
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int
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do_skey(int argc, char *argv[])
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{
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int retcode;
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int verbose;
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int i, num_files;
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int print_text, print_C;
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unsigned char *buf;
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size_t len;
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pem_object *pos;
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const char *kgen_spec;
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retcode = 0;
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verbose = 1;
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print_text = 0;
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print_C = 0;
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num_files = 0;
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buf = NULL;
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pos = NULL;
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kgen_spec = NULL;
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for (i = 0; i < argc; i ++) {
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const char *arg;
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arg = argv[i];
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if (arg[0] != '-') {
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num_files ++;
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continue;
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}
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argv[i] = NULL;
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if (eqstr(arg, "-v") || eqstr(arg, "-verbose")) {
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verbose = 1;
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} else if (eqstr(arg, "-q") || eqstr(arg, "-quiet")) {
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verbose = 0;
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} else if (eqstr(arg, "-text")) {
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print_text = 1;
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} else if (eqstr(arg, "-C")) {
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print_C = 1;
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} else if (eqstr(arg, "-gen")) {
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if (++ i >= argc) {
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fprintf(stderr,
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"ERROR: no argument for '-gen'\n");
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usage_skey();
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goto skey_exit_error;
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}
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if (kgen_spec != NULL) {
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fprintf(stderr,
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"ERROR: multiple '-gen' options\n");
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usage_skey();
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goto skey_exit_error;
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}
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kgen_spec = argv[i];
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argv[i] = NULL;
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} else {
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fprintf(stderr, "ERROR: unknown option: '%s'\n", arg);
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usage_skey();
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goto skey_exit_error;
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}
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}
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if (kgen_spec != NULL) {
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unsigned rsa_size;
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uint32_t rsa_pubexp;
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if (num_files != 0) {
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fprintf(stderr,
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"ERROR: key files provided while generating\n");
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usage_skey();
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goto skey_exit_error;
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}
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if (parse_rsa_spec(kgen_spec, &rsa_size, &rsa_pubexp)) {
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keygen_rsa(rsa_size, rsa_pubexp, print_text, print_C);
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} else {
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fprintf(stderr,
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"ERROR: unknown key specification: '%s'\n",
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kgen_spec);
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usage_skey();
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goto skey_exit_error;
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}
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} else if (num_files == 0) {
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fprintf(stderr, "ERROR: no private key provided\n");
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usage_skey();
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goto skey_exit_error;
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}
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for (i = 0; i < argc; i ++) {
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const char *fname;
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fname = argv[i];
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if (fname == NULL) {
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continue;
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}
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buf = read_file(fname, &len);
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if (buf == NULL) {
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goto skey_exit_error;
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}
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if (looks_like_DER(buf, len)) {
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if (verbose) {
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fprintf(stderr, "File '%s': ASN.1/DER object\n",
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fname);
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}
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if (decode_key(buf, len, print_text, print_C) < 0) {
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goto skey_exit_error;
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}
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} else {
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size_t u, num;
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if (verbose) {
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fprintf(stderr, "File '%s': decoding as PEM\n",
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fname);
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}
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pos = decode_pem(buf, len, &num);
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if (pos == NULL) {
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goto skey_exit_error;
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}
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for (u = 0; pos[u].name; u ++) {
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const char *name;
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name = pos[u].name;
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if (eqstr(name, "RSA PRIVATE KEY")
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|| eqstr(name, "EC PRIVATE KEY")
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|| eqstr(name, "PRIVATE KEY"))
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{
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if (decode_key(pos[u].data,
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pos[u].data_len,
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print_text, print_C) < 0)
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{
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goto skey_exit_error;
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}
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} else {
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if (verbose) {
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fprintf(stderr,
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"(skipping '%s')\n",
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name);
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}
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}
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}
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for (u = 0; pos[u].name; u ++) {
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free_pem_object_contents(&pos[u]);
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}
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xfree(pos);
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pos = NULL;
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}
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xfree(buf);
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buf = NULL;
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}
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/*
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* Release allocated structures.
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*/
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skey_exit:
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xfree(buf);
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if (pos != NULL) {
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size_t u;
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for (u = 0; pos[u].name; u ++) {
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free_pem_object_contents(&pos[u]);
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}
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xfree(pos);
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}
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return retcode;
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skey_exit_error:
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retcode = -1;
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goto skey_exit;
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}
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