-/* $OpenBSD: kexgex.c,v 1.27 2006/08/03 03:34:42 deraadt Exp $ */
+/* $OpenBSD: kexgex.c,v 1.29 2015/01/19 20:16:15 markus Exp $ */
/*
* Copyright (c) 2000 Niels Provos. All rights reserved.
* Copyright (c) 2001 Markus Friedl. All rights reserved.
#include "includes.h"
+#ifdef WITH_OPENSSL
+
#include <sys/types.h>
#include <openssl/evp.h>
#include <signal.h>
-#include "buffer.h"
-#include "key.h"
+#include "sshkey.h"
#include "cipher.h"
#include "kex.h"
#include "ssh2.h"
+#include "ssherr.h"
+#include "sshbuf.h"
+#include "digest.h"
-void
+int
kexgex_hash(
- const EVP_MD *evp_md,
- char *client_version_string,
- char *server_version_string,
- char *ckexinit, int ckexinitlen,
- char *skexinit, int skexinitlen,
- u_char *serverhostkeyblob, int sbloblen,
- int min, int wantbits, int max, BIGNUM *prime, BIGNUM *gen,
- BIGNUM *client_dh_pub,
- BIGNUM *server_dh_pub,
- BIGNUM *shared_secret,
- u_char **hash, u_int *hashlen)
+ int hash_alg,
+ const char *client_version_string,
+ const char *server_version_string,
+ const u_char *ckexinit, size_t ckexinitlen,
+ const u_char *skexinit, size_t skexinitlen,
+ const u_char *serverhostkeyblob, size_t sbloblen,
+ int min, int wantbits, int max,
+ const BIGNUM *prime,
+ const BIGNUM *gen,
+ const BIGNUM *client_dh_pub,
+ const BIGNUM *server_dh_pub,
+ const BIGNUM *shared_secret,
+ u_char *hash, size_t *hashlen)
{
- Buffer b;
- static u_char digest[EVP_MAX_MD_SIZE];
- EVP_MD_CTX md;
-
- buffer_init(&b);
- buffer_put_cstring(&b, client_version_string);
- buffer_put_cstring(&b, server_version_string);
+ struct sshbuf *b;
+ int r;
- /* kexinit messages: fake header: len+SSH2_MSG_KEXINIT */
- buffer_put_int(&b, ckexinitlen+1);
- buffer_put_char(&b, SSH2_MSG_KEXINIT);
- buffer_append(&b, ckexinit, ckexinitlen);
- buffer_put_int(&b, skexinitlen+1);
- buffer_put_char(&b, SSH2_MSG_KEXINIT);
- buffer_append(&b, skexinit, skexinitlen);
-
- buffer_put_string(&b, serverhostkeyblob, sbloblen);
- if (min == -1 || max == -1)
- buffer_put_int(&b, wantbits);
- else {
- buffer_put_int(&b, min);
- buffer_put_int(&b, wantbits);
- buffer_put_int(&b, max);
+ 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_cstring(b, client_version_string)) != 0 ||
+ (r = sshbuf_put_cstring(b, server_version_string)) != 0 ||
+ /* kexinit messages: fake header: len+SSH2_MSG_KEXINIT */
+ (r = sshbuf_put_u32(b, ckexinitlen+1)) != 0 ||
+ (r = sshbuf_put_u8(b, SSH2_MSG_KEXINIT)) != 0 ||
+ (r = sshbuf_put(b, ckexinit, ckexinitlen)) != 0 ||
+ (r = sshbuf_put_u32(b, skexinitlen+1)) != 0 ||
+ (r = sshbuf_put_u8(b, SSH2_MSG_KEXINIT)) != 0 ||
+ (r = sshbuf_put(b, skexinit, skexinitlen)) != 0 ||
+ (r = sshbuf_put_string(b, serverhostkeyblob, sbloblen)) != 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_bignum2(b, shared_secret)) != 0) {
+ sshbuf_free(b);
+ return r;
}
- buffer_put_bignum2(&b, prime);
- buffer_put_bignum2(&b, gen);
- buffer_put_bignum2(&b, client_dh_pub);
- buffer_put_bignum2(&b, server_dh_pub);
- buffer_put_bignum2(&b, shared_secret);
-
#ifdef DEBUG_KEXDH
- buffer_dump(&b);
+ sshbuf_dump(b, stderr);
#endif
-
- EVP_DigestInit(&md, evp_md);
- EVP_DigestUpdate(&md, buffer_ptr(&b), buffer_len(&b));
- EVP_DigestFinal(&md, digest, NULL);
-
- buffer_free(&b);
- *hash = digest;
- *hashlen = EVP_MD_size(evp_md);
+ 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", digest, *hashlen);
+ dump_digest("hash", hash, *hashlen);
#endif
+ return 0;
}
+#endif /* WITH_OPENSSL */