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/*
* Copyright (c) 2023-2024 Ian Marco Moffett and the Osmora Team.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of Hyra nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#include <openssl/evp.h>
#include <openssl/ec.h>
#include <openssl/pem.h>
#include <openssl/bn.h>
#include <openssl/err.h>
#include <crypto/ecdh.h>
#include <stdio.h>
static inline int
x25519_check_clamp(unsigned char *key)
{
key[0] &= 248;
key[31] &= 127;
key[31] |= 64;
return 0;
}
int
gen_x25519_keypair(struct x25519_keypair *res)
{
EVP_PKEY_CTX *ctx;
EVP_PKEY *keypair_raw = NULL;
struct x25519_keypair keypair;
int retor;
if (res == NULL) {
return -1;
}
ctx = EVP_PKEY_CTX_new_id(EVP_PKEY_X25519, NULL);
if (ctx == NULL) {
printf("ecdh: Failed to create X25519 keygen context\n");
return -1;
}
if (EVP_PKEY_keygen_init(ctx) <= 0) {
printf("ecdh: Failed to init X25519 keygen context\n");
EVP_PKEY_CTX_free(ctx);
return -1;
}
/* Create X25519 key pair */
if (EVP_PKEY_keygen(ctx, &keypair_raw) <= 0) {
printf("ecdh: Failed to generate X25519 keypair\n");
EVP_PKEY_CTX_free(ctx);
return -1;
}
/* Allocate a buffer for the public key */
EVP_PKEY_get_raw_public_key(keypair_raw, NULL, &keypair.pubkey_len);
keypair.pubkey = malloc(keypair.pubkey_len);
if (keypair.pubkey == NULL) {
printf(" ecdh: Failed to allocate memory for public key\n");
EVP_PKEY_free(keypair_raw);
EVP_PKEY_CTX_free(ctx);
return -1;
}
/* Allocate a buffer for the private key */
EVP_PKEY_get_raw_private_key(keypair_raw, NULL, &keypair.privkey_len);
keypair.privkey = malloc(keypair.privkey_len);
if (keypair.privkey == NULL) {
printf("ecdh: Failed allocating memory for private key\n");
EVP_PKEY_free(keypair_raw);
EVP_PKEY_CTX_free(ctx);
return -1;
}
retor = EVP_PKEY_get_raw_private_key(keypair_raw, keypair.privkey,
&keypair.privkey_len);
if (retor <= 0) {
printf("Failed to extract private key\n");
EVP_PKEY_free(keypair_raw);
EVP_PKEY_CTX_free(ctx);
}
retor = EVP_PKEY_get_raw_public_key(keypair_raw, keypair.pubkey,
&keypair.pubkey_len);
if (retor <= 0) {
printf("Failed to extract public key\n");
EVP_PKEY_free(keypair_raw);
EVP_PKEY_CTX_free(ctx);
}
EVP_PKEY_free(keypair_raw);
EVP_PKEY_CTX_free(ctx);
*res = keypair;
return 0;
}
int
free_x25519_keypair(struct x25519_keypair *xkp)
{
if (xkp == NULL) {
return -1;
}
free(xkp->pubkey);
free(xkp->privkey);
return 0;
}
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