Rewrite dissectors to use Libgcrypt functions.

As discussed on the mailinglist, rewriting dissectors to use Libgcrypt
functions as Libgcrypt will be mandatory after change 20030.
Removal of following functions:
- crypt_md4
- crypt_rc4*
- aes_cmac_encrypt_*
- md5_*
- sha1_*
- sha256_*

Further candidates:
- aes_*
- rijndael_*
- ...

Added functions:
- ws_hmac_buffer

Added const macros:
- HASH_MD5_LENGTH
- HASH_SHA1_LENGTH

Changes on epan/crypt/* verified with captures from
https://wiki.wireshark.org/HowToDecrypt802.11
Changes on packet-snmp.c and packet-radius.c verified with captures from
https://wiki.wireshark.org/SampleCapture
Changes on packet-tacacs.c verified with capture from
http://ccie-in-3-months.blogspot.nl/2009/04/decoding-login-credentials-regardless.html

Change-Id: Iea6ba2bf207cf0f1bf2117068fb1abcfeaafaa46
Link: https://www.wireshark.org/lists/wireshark-dev/201702/msg00011.html
Reviewed-on: https://code.wireshark.org/review/20095
Petri-Dish: Peter Wu <peter@lekensteyn.nl>
Tested-by: Petri Dish Buildbot <buildbot-no-reply@wireshark.org>
Reviewed-by: Peter Wu <peter@lekensteyn.nl>

1 files changed, 4 insertions, 10 deletions

diff --git a/editcap.c b/editcap.c
index 712ce0fb07..adca86c037 100644
--- a/editcap.c
+++ b/editcap.c
@@ -80,7 +80,7 @@
 #include <wsutil/cmdarg_err.h>
 #include <wsutil/filesystem.h>
 #include <wsutil/file_util.h>
-#include <wsutil/md5.h>
+#include <wsutil/wsgcrypt.h>
 #include <wsutil/plugins.h>
 #include <wsutil/privileges.h>
 #include <wsutil/report_err.h>
@@ -113,7 +113,7 @@ struct select_item {
  * Duplicate frame detection
  */
 typedef struct _fd_hash_t {
-    md5_byte_t digest[16];
+    guint8     digest[16];
     guint32    len;
     nstime_t   frame_time;
 } fd_hash_t;
@@ -587,7 +587,6 @@ remove_vlan_info(const struct wtap_pkthdr *phdr, guint8* fd, guint32* len) {
 static gboolean
 is_duplicate(guint8* fd, guint32 len) {
     int i;
-    md5_state_t ms;
 
     /*Hint to ignore some bytes at the start of the frame for the digest calculation(-I option) */
     guint32 offset = ignored_bytes;
@@ -606,9 +605,7 @@ is_duplicate(guint8* fd, guint32 len) {
         cur_dup_entry = 0;
 
     /* Calculate our digest */
-    md5_init(&ms);
-    md5_append(&ms, new_fd, new_len);
-    md5_finish(&ms, fd_hash[cur_dup_entry].digest);
+    gcry_md_hash_buffer(GCRY_MD_MD5, fd_hash[cur_dup_entry].digest, new_fd, new_len);
 
     fd_hash[cur_dup_entry].len = len;
 
@@ -629,7 +626,6 @@ is_duplicate(guint8* fd, guint32 len) {
 static gboolean
 is_duplicate_rel_time(guint8* fd, guint32 len, const nstime_t *current) {
     int i;
-    md5_state_t ms;
 
     /*Hint to ignore some bytes at the start of the frame for the digest calculation(-I option) */
     guint32 offset = ignored_bytes;
@@ -648,9 +644,7 @@ is_duplicate_rel_time(guint8* fd, guint32 len, const nstime_t *current) {
         cur_dup_entry = 0;
 
     /* Calculate our digest */
-    md5_init(&ms);
-    md5_append(&ms, new_fd, new_len);
-    md5_finish(&ms, fd_hash[cur_dup_entry].digest);
+    gcry_md_hash_buffer(GCRY_MD_MD5, fd_hash[cur_dup_entry].digest, new_fd, new_len);
 
     fd_hash[cur_dup_entry].len = len;
     fd_hash[cur_dup_entry].frame_time.secs = current->secs;