From: Tobias Brunner <tobias@strongswan.org>
Date: Wed, 23 May 2012 15:37:53 +0000 (+0200)
Subject: Hash function for plugin features added.
X-Git-Tag: 5.0.0~229
X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=a9cfd29c10c7a9c16167023c9470255eb1eecbb4;p=thirdparty%2Fstrongswan.git

Hash function for plugin features added.
---

diff --git a/src/libstrongswan/plugins/plugin_feature.c b/src/libstrongswan/plugins/plugin_feature.c
index 7239e512b0..eed3a31b8f 100644
--- a/src/libstrongswan/plugins/plugin_feature.c
+++ b/src/libstrongswan/plugins/plugin_feature.c
@@ -1,4 +1,7 @@
 /*
+ * Copyright (C) 2012 Tobias Brunner
+ * Hochschule fuer Technik Rapperswil
+ *
  * Copyright (C) 2011 Martin Willi
  * Copyright (C) 2011 revosec AG
  *
@@ -48,6 +51,56 @@ ENUM(plugin_feature_names, FEATURE_NONE, FEATURE_CUSTOM,
 	"CUSTOM",
 );
 
+/**
+ * See header.
+ */
+u_int32_t plugin_feature_hash(plugin_feature_t *feature)
+{
+	chunk_t data;
+
+	switch (feature->type)
+	{
+		case FEATURE_NONE:
+		case FEATURE_RNG:
+		case FEATURE_NONCE_GEN:
+		case FEATURE_DATABASE:
+		case FEATURE_FETCHER:
+			/* put these special cases in their (type-specific) buckets */
+			data = chunk_empty;
+			break;
+		case FEATURE_CRYPTER:
+		case FEATURE_AEAD:
+		case FEATURE_SIGNER:
+		case FEATURE_HASHER:
+		case FEATURE_PRF:
+		case FEATURE_DH:
+		case FEATURE_PRIVKEY:
+		case FEATURE_PRIVKEY_GEN:
+		case FEATURE_PUBKEY:
+		case FEATURE_PRIVKEY_SIGN:
+		case FEATURE_PUBKEY_VERIFY:
+		case FEATURE_PRIVKEY_DECRYPT:
+		case FEATURE_PUBKEY_ENCRYPT:
+		case FEATURE_CERT_DECODE:
+		case FEATURE_CERT_ENCODE:
+		case FEATURE_EAP_SERVER:
+		case FEATURE_EAP_PEER:
+			data = chunk_from_thing(feature->arg);
+			break;
+		case FEATURE_CUSTOM:
+			data = chunk_create(feature->arg.custom,
+								strlen(feature->arg.custom));
+			break;
+		case FEATURE_XAUTH_SERVER:
+		case FEATURE_XAUTH_PEER:
+			data = chunk_create(feature->arg.xauth,
+								strlen(feature->arg.xauth));
+			break;
+	}
+	return chunk_hash_inc(chunk_from_thing(feature->type),
+						  chunk_hash(data));
+}
+
 /**
  * See header.
  */
diff --git a/src/libstrongswan/plugins/plugin_feature.h b/src/libstrongswan/plugins/plugin_feature.h
index 25a58a4b55..10a316e4aa 100644
--- a/src/libstrongswan/plugins/plugin_feature.h
+++ b/src/libstrongswan/plugins/plugin_feature.h
@@ -1,4 +1,7 @@
 /*
+ * Copyright (C) 2012 Tobias Brunner
+ * Hochschule fuer Technik Rapperswil
+ *
  * Copyright (C) 2011 Martin Willi
  * Copyright (C) 2011 revosec AG
  *
@@ -303,6 +306,18 @@ struct plugin_feature_t {
  */
 extern enum_name_t *plugin_feature_names;
 
+/**
+ * Calculates a hash value for the given feature.
+ *
+ * Since this is intended to be used with the plugin_features_matches function
+ * the hash is not really unique for all types of features (e.g. RNGs are all
+ * mapped to the same value because they are loosely matched by said function).
+ *
+ * @param feature	feature to hash
+ * @return			hash value of the feature
+ */
+u_int32_t plugin_feature_hash(plugin_feature_t *feature);
+
 /**
  * Check if feature a matches to feature b.
  *