- djm@cvs.openbsd.org 2006/03/07 09:07:40
[kex.c kex.h monitor.c myproposal.h ssh-keyscan.c sshconnect2.c sshd.c]
Implement the diffie-hellman-group-exchange-sha256 key exchange method
using the SHA256 code in libc (and wrapper to make it into an OpenSSL
EVP), interop tested against CVS PuTTY
NB. no portability bits committed yet
diff --git a/md-sha256.c b/md-sha256.c
new file mode 100644
index 0000000..08848f8
--- /dev/null
+++ b/md-sha256.c
@@ -0,0 +1,71 @@
+/*
+ * Copyright (c) 2005 Damien Miller <djm@openbsd.org>
+ *
+ * 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 AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR 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.
+ */
+
+/* EVP wrapper for SHA256 */
+
+#include "includes.h"
+#include <openssl/evp.h>
+#include <sha2.h>
+
+RCSID("$OpenBSD: md-sha256.c,v 1.1 2006/03/07 09:07:40 djm Exp $");
+
+const EVP_MD *evp_ssh_sha256(void);
+
+static int
+ssh_sha256_init(EVP_MD_CTX *ctxt)
+{
+ SHA256_Init(ctxt->md_data);
+ return (1);
+}
+
+static int
+ssh_sha256_update(EVP_MD_CTX *ctxt, const void *data, unsigned long len)
+{
+ SHA256_Update(ctxt->md_data, data, len);
+ return (1);
+}
+
+static int
+ssh_sha256_final(EVP_MD_CTX *ctxt, unsigned char *digest)
+{
+ SHA256_Final(digest, ctxt->md_data);
+ return (1);
+}
+
+static int
+ssh_sha256_cleanup(EVP_MD_CTX *ctxt)
+{
+ memset(ctxt->md_data, 0, sizeof(SHA256_CTX));
+ return (1);
+}
+
+const EVP_MD *
+evp_ssh_sha256(void)
+{
+ static EVP_MD ssh_sha256;
+
+ memset(&ssh_sha256, 0, sizeof(ssh_sha256));
+ ssh_sha256.type = NID_undef;
+ ssh_sha256.md_size = SHA256_DIGEST_LENGTH;
+ ssh_sha256.init = ssh_sha256_init;
+ ssh_sha256.update = ssh_sha256_update;
+ ssh_sha256.final = ssh_sha256_final;
+ ssh_sha256.cleanup = ssh_sha256_cleanup;
+ ssh_sha256.block_size = SHA256_BLOCK_LENGTH;
+ ssh_sha256.ctx_size = sizeof(SHA256_CTX);
+
+ return (&ssh_sha256);
+}