[gnurl] 150/282: ntlm: Moved the HMAC MD5 function into the HMAC module as a generic function

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commit 7def168a4f6423686e8df5a4f02bce2806b763bf
Author: Steve Holme <address@hidden>
AuthorDate: Sun Feb 23 22:37:43 2020 +0000

    ntlm: Moved the HMAC MD5 function into the HMAC module as a generic function
---
 lib/curl_hmac.h      |  9 ++++++++-
 lib/curl_ntlm_core.c | 39 ++++++++++-----------------------------
 lib/hmac.c           | 39 ++++++++++++++++++++++++++++++++++++++-
 3 files changed, 56 insertions(+), 31 deletions(-)

diff --git a/lib/curl_hmac.h b/lib/curl_hmac.h
index 756dc9e4c..3ff799bbd 100644
--- a/lib/curl_hmac.h
+++ b/lib/curl_hmac.h
@@ -7,7 +7,7 @@
  *                            | (__| |_| |  _ <| |___
  *                             \___|\___/|_| \_\_____|
  *
- * Copyright (C) 1998 - 2016, Daniel Stenberg, <address@hidden>, et al.
+ * Copyright (C) 1998 - 2020, Daniel Stenberg, <address@hidden>, et al.
  *
  * This software is licensed as described in the file COPYING, which
  * you should have received as part of this distribution. The terms
@@ -24,6 +24,8 @@
 
 #ifndef CURL_DISABLE_CRYPTO_AUTH
 
+#define HMAC_MD5_LENGTH 16
+
 typedef void    (* HMAC_hinit_func)(void *context);
 typedef void    (* HMAC_hupdate_func)(void *context,
                                       const unsigned char *data,
@@ -62,6 +64,11 @@ int Curl_HMAC_update(HMAC_context *context,
                      unsigned int len);
 int Curl_HMAC_final(HMAC_context *context, unsigned char *result);
 
+CURLcode Curl_hmacit(const HMAC_params *hashparams,
+                     const unsigned char *key, const size_t keylen,
+                     const unsigned char *data, const size_t datalen,
+                     unsigned char *output);
+
 #endif
 
 #endif /* HEADER_CURL_HMAC_H */
diff --git a/lib/curl_ntlm_core.c b/lib/curl_ntlm_core.c
index 19f9b61d8..f9b823b4f 100644
--- a/lib/curl_ntlm_core.c
+++ b/lib/curl_ntlm_core.c
@@ -5,7 +5,7 @@
  *                            | (__| |_| |  _ <| |___
  *                             \___|\___/|_| \_\_____|
  *
- * Copyright (C) 1998 - 2019, Daniel Stenberg, <address@hidden>, et al.
+ * Copyright (C) 1998 - 2020, Daniel Stenberg, <address@hidden>, et al.
  *
  * This software is licensed as described in the file COPYING, which
  * you should have received as part of this distribution. The terms
@@ -120,7 +120,6 @@
 #include "curl_memory.h"
 #include "memdebug.h"
 
-#define NTLM_HMAC_MD5_LEN     (16)
 #define NTLMv2_BLOB_SIGNATURE "\x01\x01\x00\x00"
 #define NTLMv2_BLOB_LEN       (44 -16 + ntlm->target_info_len + 4)
 
@@ -567,25 +566,6 @@ CURLcode Curl_ntlm_core_mk_nt_hash(struct Curl_easy *data,
 
 #if defined(USE_NTLM_V2) && !defined(USE_WINDOWS_SSPI)
 
-/* This returns the HMAC MD5 digest */
-static CURLcode hmac_md5(const unsigned char *key, unsigned int keylen,
-                         const unsigned char *data, unsigned int datalen,
-                         unsigned char *output)
-{
-  HMAC_context *ctxt = Curl_HMAC_init(Curl_HMAC_MD5, key, keylen);
-
-  if(!ctxt)
-    return CURLE_OUT_OF_MEMORY;
-
-  /* Update the digest with the given challenge */
-  Curl_HMAC_update(ctxt, data, datalen);
-
-  /* Finalise the digest */
-  Curl_HMAC_final(ctxt, output);
-
-  return CURLE_OK;
-}
-
 /* This creates the NTLMv2 hash by using NTLM hash as the key and Unicode
  * (uppercase UserName + Domain) as the data
  */
@@ -615,8 +595,8 @@ CURLcode Curl_ntlm_core_mk_ntlmv2_hash(const char *user, 
size_t userlen,
   ascii_uppercase_to_unicode_le(identity, user, userlen);
   ascii_to_unicode_le(identity + (userlen << 1), domain, domlen);
 
-  result = hmac_md5(ntlmhash, 16, identity, curlx_uztoui(identity_len),
-                    ntlmv2hash);
+  result = Curl_hmacit(Curl_HMAC_MD5, ntlmhash, 16, identity, identity_len,
+                       ntlmv2hash);
   free(identity);
 
   return result;
@@ -662,7 +642,7 @@ CURLcode Curl_ntlm_core_mk_ntlmv2_resp(unsigned char 
*ntlmv2hash,
 
   unsigned int len = 0;
   unsigned char *ptr = NULL;
-  unsigned char hmac_output[NTLM_HMAC_MD5_LEN];
+  unsigned char hmac_output[HMAC_MD5_LENGTH];
   curl_off_t tw;
 
   CURLcode result = CURLE_OK;
@@ -681,7 +661,7 @@ CURLcode Curl_ntlm_core_mk_ntlmv2_resp(unsigned char 
*ntlmv2hash,
     tw = ((curl_off_t)time(NULL) + CURL_OFF_T_C(11644473600)) * 10000000;
 
   /* Calculate the response len */
-  len = NTLM_HMAC_MD5_LEN + NTLMv2_BLOB_LEN;
+  len = HMAC_MD5_LENGTH + NTLMv2_BLOB_LEN;
 
   /* Allocate the response */
   ptr = calloc(1, len);
@@ -689,7 +669,7 @@ CURLcode Curl_ntlm_core_mk_ntlmv2_resp(unsigned char 
*ntlmv2hash,
     return CURLE_OUT_OF_MEMORY;
 
   /* Create the BLOB structure */
-  msnprintf((char *)ptr + NTLM_HMAC_MD5_LEN, NTLMv2_BLOB_LEN,
+  msnprintf((char *)ptr + HMAC_MD5_LENGTH, NTLMv2_BLOB_LEN,
             "%c%c%c%c"   /* NTLMv2_BLOB_SIGNATURE */
             "%c%c%c%c",  /* Reserved = 0 */
             NTLMv2_BLOB_SIGNATURE[0], NTLMv2_BLOB_SIGNATURE[1],
@@ -702,7 +682,7 @@ CURLcode Curl_ntlm_core_mk_ntlmv2_resp(unsigned char 
*ntlmv2hash,
 
   /* Concatenate the Type 2 challenge with the BLOB and do HMAC MD5 */
   memcpy(ptr + 8, &ntlm->nonce[0], 8);
-  result = hmac_md5(ntlmv2hash, NTLM_HMAC_MD5_LEN, ptr + 8,
+  result = Curl_hmacit(Curl_HMAC_MD5, ntlmv2hash, HMAC_MD5_LENGTH, ptr + 8,
                     NTLMv2_BLOB_LEN + 8, hmac_output);
   if(result) {
     free(ptr);
@@ -710,7 +690,7 @@ CURLcode Curl_ntlm_core_mk_ntlmv2_resp(unsigned char 
*ntlmv2hash,
   }
 
   /* Concatenate the HMAC MD5 output  with the BLOB */
-  memcpy(ptr, hmac_output, NTLM_HMAC_MD5_LEN);
+  memcpy(ptr, hmac_output, HMAC_MD5_LENGTH);
 
   /* Return the response */
   *ntresp = ptr;
@@ -745,7 +725,8 @@ CURLcode  Curl_ntlm_core_mk_lmv2_resp(unsigned char 
*ntlmv2hash,
   memcpy(&data[0], challenge_server, 8);
   memcpy(&data[8], challenge_client, 8);
 
-  result = hmac_md5(ntlmv2hash, 16, &data[0], 16, hmac_output);
+  result = Curl_hmacit(Curl_HMAC_MD5, ntlmv2hash, 16, &data[0], 16,
+                       hmac_output);
   if(result)
     return result;
 
diff --git a/lib/hmac.c b/lib/hmac.c
index bf49ebec5..ae68827be 100644
--- a/lib/hmac.c
+++ b/lib/hmac.c
@@ -5,7 +5,7 @@
  *                            | (__| |_| |  _ <| |___
  *                             \___|\___/|_| \_\_____|
  *
- * Copyright (C) 1998 - 2018, Daniel Stenberg, <address@hidden>, et al.
+ * Copyright (C) 1998 - 2020, Daniel Stenberg, <address@hidden>, et al.
  *
  * This software is licensed as described in the file COPYING, which
  * you should have received as part of this distribution. The terms
@@ -30,6 +30,7 @@
 
 #include "curl_hmac.h"
 #include "curl_memory.h"
+#include "warnless.h"
 
 /* The last #include file should be: */
 #include "memdebug.h"
@@ -129,4 +130,40 @@ int Curl_HMAC_final(HMAC_context *ctxt, unsigned char 
*result)
   return 0;
 }
 
+/*
+ * Curl_hmacit()
+ *
+ * This is used to generate a HMAC hash, for the specified input data, given
+ * the specified hash function and key.
+ *
+ * Parameters:
+ *
+ * hashparams [in]     - The hash function (Curl_HMAC_MD5).
+ * key        [in]     - The key to use.
+ * keylen     [in]     - The length of the key.
+ * data       [in]     - The data to encrypt.
+ * datalen    [in]     - The length of the data.
+ * output     [in/out] - The output buffer.
+ *
+ * Returns CURLE_OK on success.
+ */
+CURLcode Curl_hmacit(const HMAC_params *hashparams,
+                     const unsigned char *key, const size_t keylen,
+                     const unsigned char *data, const size_t datalen,
+                     unsigned char *output)
+{
+  HMAC_context *ctxt = Curl_HMAC_init(hashparams, key, curlx_uztoui(keylen));
+
+  if(!ctxt)
+    return CURLE_OUT_OF_MEMORY;
+
+  /* Update the digest with the given challenge */
+  Curl_HMAC_update(ctxt, data, curlx_uztoui(datalen));
+
+  /* Finalise the digest */
+  Curl_HMAC_final(ctxt, output);
+
+  return CURLE_OK;
+}
+
 #endif /* CURL_DISABLE_CRYPTO_AUTH */

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