diff options
Diffstat (limited to 'kexgex.c')
| -rw-r--r-- | kexgex.c | 104 |
1 files changed, 104 insertions, 0 deletions
diff --git a/kexgex.c b/kexgex.c new file mode 100644 index 0000000..8040a13 --- /dev/null +++ b/kexgex.c @@ -0,0 +1,104 @@ +/* $OpenBSD: kexgex.c,v 1.32 2019/01/23 00:30:41 djm Exp $ */ +/* + * Copyright (c) 2000 Niels Provos. All rights reserved. + * Copyright (c) 2001 Markus Friedl. 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. + * + * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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 "includes.h" + +#ifdef WITH_OPENSSL + +#include <sys/types.h> + +#include <openssl/evp.h> +#include <signal.h> + +#include "openbsd-compat/openssl-compat.h" + +#include "sshkey.h" +#include "cipher.h" +#include "kex.h" +#include "ssh2.h" +#include "ssherr.h" +#include "sshbuf.h" +#include "digest.h" + +int +kexgex_hash( + int hash_alg, + const struct sshbuf *client_version, + const struct sshbuf *server_version, + const struct sshbuf *client_kexinit, + const struct sshbuf *server_kexinit, + const struct sshbuf *server_host_key_blob, + int min, int wantbits, int max, + const BIGNUM *prime, + const BIGNUM *gen, + const BIGNUM *client_dh_pub, + const BIGNUM *server_dh_pub, + const u_char *shared_secret, size_t secretlen, + u_char *hash, size_t *hashlen) +{ + struct sshbuf *b; + int r; + + if (*hashlen < ssh_digest_bytes(SSH_DIGEST_SHA1)) + return SSH_ERR_INVALID_ARGUMENT; + if ((b = sshbuf_new()) == NULL) + return SSH_ERR_ALLOC_FAIL; + if ((r = sshbuf_put_stringb(b, client_version)) < 0 || + (r = sshbuf_put_stringb(b, server_version)) < 0 || + /* kexinit messages: fake header: len+SSH2_MSG_KEXINIT */ + (r = sshbuf_put_u32(b, sshbuf_len(client_kexinit) + 1)) != 0 || + (r = sshbuf_put_u8(b, SSH2_MSG_KEXINIT)) != 0 || + (r = sshbuf_putb(b, client_kexinit)) != 0 || + (r = sshbuf_put_u32(b, sshbuf_len(server_kexinit) + 1)) != 0 || + (r = sshbuf_put_u8(b, SSH2_MSG_KEXINIT)) != 0 || + (r = sshbuf_putb(b, server_kexinit)) != 0 || + (r = sshbuf_put_stringb(b, server_host_key_blob)) != 0 || + (min != -1 && (r = sshbuf_put_u32(b, min)) != 0) || + (r = sshbuf_put_u32(b, wantbits)) != 0 || + (max != -1 && (r = sshbuf_put_u32(b, max)) != 0) || + (r = sshbuf_put_bignum2(b, prime)) != 0 || + (r = sshbuf_put_bignum2(b, gen)) != 0 || + (r = sshbuf_put_bignum2(b, client_dh_pub)) != 0 || + (r = sshbuf_put_bignum2(b, server_dh_pub)) != 0 || + (r = sshbuf_put(b, shared_secret, secretlen)) != 0) { + sshbuf_free(b); + return r; + } +#ifdef DEBUG_KEXDH + sshbuf_dump(b, stderr); +#endif + if (ssh_digest_buffer(hash_alg, b, hash, *hashlen) != 0) { + sshbuf_free(b); + return SSH_ERR_LIBCRYPTO_ERROR; + } + sshbuf_free(b); + *hashlen = ssh_digest_bytes(hash_alg); +#ifdef DEBUG_KEXDH + dump_digest("hash", hash, *hashlen); +#endif + return 0; +} +#endif /* WITH_OPENSSL */ |