From 6925202bdee75d191bb5743659c53155ba1605ea Mon Sep 17 00:00:00 2001
From: Jelmer Vernooij <jelmer@samba.org>
Date: Wed, 24 Sep 2008 15:30:23 +0200
Subject: Move source4/lib/crypto to lib/crypto.

---
 lib/crypto/hmacmd5.c | 117 +++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 117 insertions(+)
 create mode 100644 lib/crypto/hmacmd5.c

(limited to 'lib/crypto/hmacmd5.c')

diff --git a/lib/crypto/hmacmd5.c b/lib/crypto/hmacmd5.c
new file mode 100644
index 0000000000..3a9ec38a27
--- /dev/null
+++ b/lib/crypto/hmacmd5.c
@@ -0,0 +1,117 @@
+/* 
+   Unix SMB/CIFS implementation.
+   HMAC MD5 code for use in NTLMv2
+   Copyright (C) Luke Kenneth Casson Leighton 1996-2000
+   Copyright (C) Andrew Tridgell 1992-2000
+   
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 3 of the License, or
+   (at your option) any later version.
+   
+   This program 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 General Public License for more details.
+   
+   You should have received a copy of the GNU General Public License
+   along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+/* taken direct from rfc2104 implementation and modified for suitable use
+ * for ntlmv2.
+ */
+
+#include "includes.h"
+#include "lib/crypto/crypto.h"
+
+/***********************************************************************
+ the rfc 2104 version of hmac_md5 initialisation.
+***********************************************************************/
+_PUBLIC_ void hmac_md5_init_rfc2104(const uint8_t *key, int key_len, HMACMD5Context *ctx)
+{
+        int i;
+	uint8_t tk[16];
+
+        /* if key is longer than 64 bytes reset it to key=MD5(key) */
+        if (key_len > 64)
+	{
+                struct MD5Context tctx;
+
+                MD5Init(&tctx);
+                MD5Update(&tctx, key, key_len);
+                MD5Final(tk, &tctx);
+
+                key = tk;
+                key_len = 16;
+        }
+
+        /* start out by storing key in pads */
+        ZERO_STRUCT(ctx->k_ipad);
+        ZERO_STRUCT(ctx->k_opad);
+        memcpy( ctx->k_ipad, key, key_len);
+        memcpy( ctx->k_opad, key, key_len);
+
+        /* XOR key with ipad and opad values */
+        for (i=0; i<64; i++)
+	{
+                ctx->k_ipad[i] ^= 0x36;
+                ctx->k_opad[i] ^= 0x5c;
+        }
+
+        MD5Init(&ctx->ctx);
+        MD5Update(&ctx->ctx, ctx->k_ipad, 64);  
+}
+
+/***********************************************************************
+ the microsoft version of hmac_md5 initialisation.
+***********************************************************************/
+_PUBLIC_ void hmac_md5_init_limK_to_64(const uint8_t *key, int key_len,
+			HMACMD5Context *ctx)
+{
+        /* if key is longer than 64 bytes truncate it */
+        if (key_len > 64)
+	{
+                key_len = 64;
+        }
+
+	hmac_md5_init_rfc2104(key, key_len, ctx);
+}
+
+/***********************************************************************
+ update hmac_md5 "inner" buffer
+***********************************************************************/
+_PUBLIC_ void hmac_md5_update(const uint8_t *text, int text_len, HMACMD5Context *ctx)
+{
+        MD5Update(&ctx->ctx, text, text_len); /* then text of datagram */
+}
+
+/***********************************************************************
+ finish off hmac_md5 "inner" buffer and generate outer one.
+***********************************************************************/
+_PUBLIC_ void hmac_md5_final(uint8_t *digest, HMACMD5Context *ctx)
+{
+        struct MD5Context ctx_o;
+
+        MD5Final(digest, &ctx->ctx);          
+
+        MD5Init(&ctx_o);
+        MD5Update(&ctx_o, ctx->k_opad, 64);   
+        MD5Update(&ctx_o, digest, 16); 
+        MD5Final(digest, &ctx_o);
+}
+
+/***********************************************************
+ single function to calculate an HMAC MD5 digest from data.
+ use the microsoft hmacmd5 init method because the key is 16 bytes.
+************************************************************/
+_PUBLIC_ void hmac_md5(const uint8_t key[16], const uint8_t *data, int data_len, uint8_t *digest)
+{
+	HMACMD5Context ctx;
+	hmac_md5_init_limK_to_64(key, 16, &ctx);
+	if (data_len != 0)
+	{
+		hmac_md5_update(data, data_len, &ctx);
+	}
+	hmac_md5_final(digest, &ctx);
+}
-- 
cgit