md5 and hmac_md5

(This used to be commit 5777c1fb12edca8e57e9d5911428f70db2cf9a62)

1 files changed, 119 insertions, 0 deletions

diff --git a/source3/lib/hmacmd5.c b/source3/lib/hmacmd5.c
new file mode 100644
index 0000000000..9821afdc1d
--- /dev/null
+++ b/source3/lib/hmacmd5.c
@@ -0,0 +1,119 @@
+/* 
+   Unix SMB/Netbios implementation.
+   Version 1.9.
+   Interface header: Scheduler service
+   Copyright (C) Luke Kenneth Casson Leighton 1996-1999
+   Copyright (C) Andrew Tridgell 1992-1999
+   
+   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 2 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, write to the Free Software
+   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+*/
+
+/* taken direct from rfc2104 implementation and modified for suitable use
+ * for ntlmv2.
+ */
+
+#include "includes.h"
+
+/***********************************************************************
+ the rfc 2104 version of hmac_md5 initialisation.
+***********************************************************************/
+void hmac_md5_init_rfc2104(uchar*  key, int key_len, HMACMD5Context *ctx)
+{
+        int i;
+
+        /* if key is longer than 64 bytes reset it to key=MD5(key) */
+        if (key_len > 64)
+	{
+		uchar tk[16];
+                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 */
+        bzero( ctx->k_ipad, sizeof ctx->k_ipad);
+        bzero( ctx->k_opad, sizeof ctx->k_opad);
+        bcopy( key, ctx->k_ipad, key_len);
+        bcopy( key, ctx->k_opad, 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.
+***********************************************************************/
+void hmac_md5_init_limK_to_64(uchar*  key, int key_len, HMACMD5Context *ctx)
+{
+        int i;
+
+        /* if key is longer than 64 bytes truncate it */
+        if (key_len > 64)
+	{
+                key_len = 64;
+        }
+
+        /* start out by storing key in pads */
+        bzero( ctx->k_ipad, sizeof ctx->k_ipad);
+        bzero( ctx->k_opad, sizeof ctx->k_opad);
+        bcopy( key, ctx->k_ipad, key_len);
+        bcopy( key, ctx->k_opad, 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);  
+}
+
+/***********************************************************************
+ update hmac_md5 "inner" buffer
+***********************************************************************/
+void hmac_md5_update(uchar* 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.
+***********************************************************************/
+void hmac_md5_final(caddr_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);
+}