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sec_negotiate_openssl.h
/* FreeTDS - Library of routines accessing Sybase and Microsoft databases
* Copyright (C) 2015 Frediano Ziglio
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
#include <openssl/rand.h>
#include <openssl/bio.h>
#include <openssl/pem.h>
#include <openssl/err.h>
#ifndef HAVE_OPENSSL
#error HAVE_OPENSSL not defines, this file should not be included
#endif
static inline const BIGNUM*
rsa_get_n(const RSA *rsa)
{
#if HAVE_RSA_GET0_KEY
const BIGNUM *n, *e, *d;
RSA_get0_key(rsa, &n, &e, &d);
return n;
#else
return rsa->n;
#endif
}
static void*
tds5_rsa_encrypt(const void *key, size_t key_len, const void *nonce, size_t nonce_len, const char *pwd, size_t *em_size)
{
RSA *rsa = NULL;
BIO *keybio;
uint8_t *message = NULL;
size_t message_len, pwd_len;
uint8_t *em = NULL;
int result;
keybio = BIO_new_mem_buf((void*) key, key_len);
if (keybio == NULL)
goto error;
rsa = PEM_read_bio_RSAPublicKey(keybio, &rsa, NULL, NULL);
if (!rsa)
goto error;
pwd_len = strlen(pwd);
message_len = nonce_len + pwd_len;
message = tds_new(uint8_t, message_len);
if (!message)
goto error;
memcpy(message, nonce, nonce_len);
memcpy(message + nonce_len, pwd, pwd_len);
em = tds_new(uint8_t, BN_num_bytes(rsa_get_n(rsa)));
if (!em)
goto error;
result = RSA_public_encrypt(message_len, message, em, rsa, RSA_PKCS1_OAEP_PADDING);
if (result < 0)
goto error;
free(message);
RSA_free(rsa);
BIO_free(keybio);
*em_size = result;
return em;
error:
free(message);
free(em);
RSA_free(rsa);
BIO_free(keybio);
return NULL;
}