api: add function crypto_hmac (issue #1628)

src/plugins/plugin-api.c

@@ -162,6 +162,39 @@ plugin_api_crypto_hash_pbkdf2 (const void *data, int data_size,
                                   iterations, hash, hash_size);
 }
 
+/*
+ * Computes HMAC of key + message using the given algorithm.
+ *
+ * Returns:
+ *   1: OK
+ *   0: error
+ */
+
+int
+plugin_api_crypto_hmac (const void *key, int key_size,
+                        const void *message, int message_size,
+                        const char *hash_algo,
+                        void *hash, int *hash_size)
+{
+    int algo;
+
+    if (!hash)
+        return 0;
+
+    if (hash_size)
+        *hash_size = 0;
+
+    if (!key || (key_size < 1) || !message || (message_size < 1) || !hash_algo)
+        return 0;
+
+    algo = weecrypto_get_hash_algo (hash_algo);
+    if (algo == GCRY_MD_NONE)
+        return 0;
+
+    return weecrypto_hmac (key, key_size, message, message_size,
+                           algo, hash, hash_size);
+}
+
 /*
  * Frees an option.
  */

src/plugins/plugin-api.h

@@ -38,6 +38,10 @@ extern int plugin_api_crypto_hash_pbkdf2 (const void *data, int data_size,
                                           const void *salt, int salt_size,
                                           int iterations,
                                           void *hash, int *hash_size);
+extern int plugin_api_crypto_hmac (const void *key, int key_size,
+                                   const void *message, int message_size,
+                                   const char *hash_algo,
+                                   void *hash, int *hash_size);
 
 /* config */
 extern void plugin_api_config_file_option_free (struct t_config_option *option);

src/plugins/plugin.c

@@ -665,6 +665,7 @@ plugin_load (const char *filename, int init_plugin, int argc, char **argv)
 
         new_plugin->crypto_hash = &plugin_api_crypto_hash;
         new_plugin->crypto_hash_pbkdf2 = &plugin_api_crypto_hash_pbkdf2;
+        new_plugin->crypto_hmac = &plugin_api_crypto_hmac;
 
         new_plugin->mkdir_home = &dir_mkdir_home;
         new_plugin->mkdir = &dir_mkdir;

src/plugins/weechat-plugin.h

@@ -68,7 +68,7 @@ struct timeval;
  * please change the date with current one; for a second change at same
  * date, increment the 01, otherwise please keep 01.
  */
-#define WEECHAT_PLUGIN_API_VERSION "20201004-01"
+#define WEECHAT_PLUGIN_API_VERSION "20210601-01"
 
 /* macros for defining plugin infos */
 #define WEECHAT_PLUGIN_NAME(__name)                                     \
@@ -382,6 +382,9 @@ struct t_weechat_plugin
                                const void *salt, int salt_size,
                                int iterations,
                                void *hash, int *hash_size);
+    int (*crypto_hmac) (const void *key, int key_size,
+                        const void *message, int message_size,
+                        const char *hash_algo, void *hash, int *hash_size);
 
     /* directories/files */
     int (*mkdir_home) (const char *directory, int mode);
@@ -1347,6 +1350,14 @@ extern int weechat_plugin_end (struct t_weechat_plugin *plugin);
                                          __salt, __salt_size,           \
                                          __iterations,                  \
                                          __hash, __hash_size)
+#define weechat_crypto_hmac(__key, __key_size,                          \
+                            __message, __message_size,                  \
+                            __hash_algo,                                \
+                            __hash, __hash_size)                        \
+    (weechat_plugin->crypto_hmac)(__key, __key_size,                    \
+                                  __message, __message_size,            \
+                                  __hash_algo,                          \
+                                  __hash, __hash_size)
 
 /* directories */
 #define weechat_mkdir_home(__directory, __mode)                         \