openssl: Add helper to determine EVP_MD from hash_algorithm_t

2 files changed, 27 insertions, 9 deletions

diff --git a/src/libstrongswan/plugins/openssl/openssl_hasher.c b/src/libstrongswan/plugins/openssl/openssl_hasher.c
index 96ee230c9..eb6c50508 100644
--- a/src/libstrongswan/plugins/openssl/openssl_hasher.c
+++ b/src/libstrongswan/plugins/openssl/openssl_hasher.c
@@ -1,6 +1,6 @@
 /*
- * Copyright (C) 2008 Tobias Brunner
- * Hochschule fuer Technik Rapperswil
+ * Copyright (C) 2008-2017 Tobias Brunner
+ * HSR Hochschule fuer Technik Rapperswil
  *
  * 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
@@ -91,16 +91,24 @@ METHOD(hasher_t, destroy, void,
 /*
  * Described in header
  */
-openssl_hasher_t *openssl_hasher_create(hash_algorithm_t algo)
+const EVP_MD *openssl_get_md(hash_algorithm_t hash)
 {
-	private_openssl_hasher_t *this;
-	char* name;
+	char *name;
 
-	name = enum_to_name(hash_algorithm_short_names, algo);
+	name = enum_to_name(hash_algorithm_short_names, hash);
 	if (!name)
 	{
 		return NULL;
 	}
+	return EVP_get_digestbyname(name);
+}
+
+/*
+ * Described in header
+ */
+openssl_hasher_t *openssl_hasher_create(hash_algorithm_t algo)
+{
+	private_openssl_hasher_t *this;
 
 	INIT(this,
 		.public = {
@@ -114,7 +122,7 @@ openssl_hasher_t *openssl_hasher_create(hash_algorithm_t algo)
 		},
 	);
 
-	this->hasher = EVP_get_digestbyname(name);
+	this->hasher = openssl_get_md(algo);
 	if (!this->hasher)
 	{
 		/* OpenSSL does not support the requested algo */
diff --git a/src/libstrongswan/plugins/openssl/openssl_hasher.h b/src/libstrongswan/plugins/openssl/openssl_hasher.h
index b03f6891b..66b9b505e 100644
--- a/src/libstrongswan/plugins/openssl/openssl_hasher.h
+++ b/src/libstrongswan/plugins/openssl/openssl_hasher.h
@@ -1,6 +1,6 @@
 /*
- * Copyright (C) 2008 Tobias Brunner
- * Hochschule fuer Technik Rapperswil
+ * Copyright (C) 2008-2017 Tobias Brunner
+ * HSR Hochschule fuer Technik Rapperswil
  *
  * 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
@@ -25,6 +25,8 @@ typedef struct openssl_hasher_t openssl_hasher_t;
 
 #include <crypto/hashers/hasher.h>
 
+#include <openssl/evp.h>
+
 /**
  * Implementation of hashers using OpenSSL.
  */
@@ -37,6 +39,14 @@ struct openssl_hasher_t {
 };
 
 /**
+ * Determine EVP_MD for the given hash algorithm
+ *
+ * @param hash			hash algorithm
+ * @return				EVP_MD or NULL if not found/supported
+ */
+const EVP_MD *openssl_get_md(hash_algorithm_t hash);
+
+/**
  * Constructor to create openssl_hasher_t.
  *
  * @param algo			algorithm