initial commit

hmacmd5.c

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+
+/* 
+   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 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.
+ */
+#ifdef LIBOPENSSL
+
+#include <string.h>
+#include "hmacmd5.h"
+
+#define ZERO_STRUCT(x) memset((char *)&(x), 0, sizeof(x))
+
+/***********************************************************************
+ the rfc 2104 version of hmac_md5 initialisation.
+***********************************************************************/
+
+void hmac_md5_init_rfc2104(const unsigned char *key, int key_len, HMACMD5Context * ctx) {
+  int i;
+  unsigned char tk[16];
+
+  /* if key is longer than 64 bytes reset it to key=MD5(key) */
+  if (key_len > 64) {
+    MD5_CTX tctx;
+
+    MD5_Init(&tctx);
+    MD5_Update(&tctx, (void *) key, key_len);
+    MD5_Final(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;
+  }
+
+  MD5_Init(&ctx->ctx);
+  MD5_Update(&ctx->ctx, ctx->k_ipad, 64);
+}
+
+/***********************************************************************
+ the microsoft version of hmac_md5 initialisation.
+***********************************************************************/
+
+void hmac_md5_init_limK_to_64(const unsigned char *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 */
+  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;
+  }
+
+  MD5_Init(&ctx->ctx);
+  MD5_Update(&ctx->ctx, ctx->k_ipad, 64);
+}
+
+/***********************************************************************
+ update hmac_md5 "inner" buffer
+***********************************************************************/
+
+void hmac_md5_update(const unsigned char *text, int text_len, HMACMD5Context * ctx) {
+  MD5_Update(&ctx->ctx, (void *) text, text_len);       /* then text of datagram */
+}
+
+/***********************************************************************
+ finish off hmac_md5 "inner" buffer and generate outer one.
+***********************************************************************/
+void hmac_md5_final(unsigned char *digest, HMACMD5Context * ctx)
+{
+  MD5_CTX ctx_o;
+
+  MD5_Final(digest, &ctx->ctx);
+
+  MD5_Init(&ctx_o);
+  MD5_Update(&ctx_o, ctx->k_opad, 64);
+  MD5_Update(&ctx_o, digest, 16);
+  MD5_Final(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.
+************************************************************/
+
+void hmac_md5(unsigned char key[16], unsigned char *data, int data_len, unsigned char *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);
+}
+
+#endif