- 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

1 files changed, 71 insertions, 0 deletions

diff --git a/md-sha256.c b/md-sha256.c
new file mode 100644
index 00000000..08848f84
--- /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);
+}