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/* $Id: key.c,v 1.7 2022/12/18 12:08:49 tb Exp $ */
/*
* Copyright (c) 2019 Renaud Allard <renaud@allard.it>
* Copyright (c) 2016 Kristaps Dzonsons <kristaps@bsd.lv>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHORS DISCLAIM ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <err.h>
#include <stdlib.h>
#include <unistd.h>
#include <openssl/evp.h>
#include <openssl/pem.h>
#include <openssl/rsa.h>
#include <openssl/ecdsa.h>
#include <openssl/ec.h>
#include <openssl/obj_mac.h>
#include "key.h"
/*
* Default number of bits when creating a new RSA key.
*/
#define KBITS 4096
/*
* Create an RSA key with the default KBITS number of bits.
*/
EVP_PKEY *
rsa_key_create(FILE *f, const char *fname)
{
EVP_PKEY_CTX *ctx = NULL;
EVP_PKEY *pkey = NULL;
/* First, create the context and the key. */
if ((ctx = EVP_PKEY_CTX_new_id(EVP_PKEY_RSA, NULL)) == NULL) {
warnx("EVP_PKEY_CTX_new_id");
goto err;
} else if (EVP_PKEY_keygen_init(ctx) <= 0) {
warnx("EVP_PKEY_keygen_init");
goto err;
} else if (EVP_PKEY_CTX_set_rsa_keygen_bits(ctx, KBITS) <= 0) {
warnx("EVP_PKEY_set_rsa_keygen_bits");
goto err;
} else if (EVP_PKEY_keygen(ctx, &pkey) <= 0) {
warnx("EVP_PKEY_keygen");
goto err;
}
/* Serialise the key to the disc. */
if (PEM_write_PrivateKey(f, pkey, NULL, NULL, 0, NULL, NULL))
goto out;
warnx("%s: PEM_write_PrivateKey", fname);
err:
EVP_PKEY_free(pkey);
pkey = NULL;
out:
EVP_PKEY_CTX_free(ctx);
return pkey;
}
EVP_PKEY *
ec_key_create(FILE *f, const char *fname)
{
EC_KEY *eckey = NULL;
EVP_PKEY *pkey = NULL;
if ((eckey = EC_KEY_new_by_curve_name(NID_secp384r1)) == NULL ) {
warnx("EC_KEY_new_by_curve_name");
goto err;
}
if (!EC_KEY_generate_key(eckey)) {
warnx("EC_KEY_generate_key");
goto err;
}
/* set OPENSSL_EC_NAMED_CURVE to be able to load the key */
EC_KEY_set_asn1_flag(eckey, OPENSSL_EC_NAMED_CURVE);
/* Serialise the key to the disc in EC format */
if (!PEM_write_ECPrivateKey(f, eckey, NULL, NULL, 0, NULL, NULL)) {
warnx("%s: PEM_write_ECPrivateKey", fname);
goto err;
}
/* Convert the EC key into a PKEY structure */
if ((pkey = EVP_PKEY_new()) == NULL) {
warnx("EVP_PKEY_new");
goto err;
}
if (!EVP_PKEY_set1_EC_KEY(pkey, eckey)) {
warnx("EVP_PKEY_assign_EC_KEY");
goto err;
}
goto out;
err:
EVP_PKEY_free(pkey);
pkey = NULL;
out:
EC_KEY_free(eckey);
return pkey;
}
EVP_PKEY *
key_load(FILE *f, const char *fname)
{
EVP_PKEY *pkey;
pkey = PEM_read_PrivateKey(f, NULL, NULL, NULL);
if (pkey == NULL) {
warnx("%s: PEM_read_PrivateKey", fname);
return NULL;
}
if (EVP_PKEY_base_id(pkey) == EVP_PKEY_RSA ||
EVP_PKEY_base_id(pkey) == EVP_PKEY_EC)
return pkey;
warnx("%s: unsupported key type", fname);
EVP_PKEY_free(pkey);
return NULL;
}
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