Added TLS crypto helper, currently supports cipher suite selection

1 files changed, 140 insertions, 0 deletions

diff --git a/src/charon/plugins/eap_tls/tls/tls_crypto.c b/src/charon/plugins/eap_tls/tls/tls_crypto.c
new file mode 100644
index 000000000..10add151c
--- /dev/null
+++ b/src/charon/plugins/eap_tls/tls/tls_crypto.c
@@ -0,0 +1,140 @@
+/*
+ * Copyright (C) 2010 Martin Willi
+ * Copyright (C) 2010 revosec AG
+ *
+ * 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
+ * Free Software Foundation; either version 2 of the License, or (at your
+ * option) any later version.  See <http://www.fsf.org/copyleft/gpl.txt>.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+ * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * for more details.
+ */
+
+#include "tls_crypto.h"
+
+typedef struct private_tls_crypto_t private_tls_crypto_t;
+
+/**
+ * Private data of an tls_crypto_t object.
+ */
+struct private_tls_crypto_t {
+
+	/**
+	 * Public tls_crypto_t interface.
+	 */
+	tls_crypto_t public;
+};
+
+METHOD(tls_crypto_t, get_cipher_suites, int,
+	private_tls_crypto_t *this, tls_cipher_suite_t **suites)
+{
+	encryption_algorithm_t encr;
+	integrity_algorithm_t mac;
+	enumerator_t *encrs, *macs;
+	tls_cipher_suite_t buf[64];
+	int count = 0, i, j, res = 0;
+
+	/* we assume that we support RSA, but no DHE yet */
+	macs = lib->crypto->create_signer_enumerator(lib->crypto);
+	while (macs->enumerate(macs, &mac))
+	{
+		switch (mac)
+		{
+			case AUTH_HMAC_SHA1_160:
+				buf[count++] = TLS_RSA_WITH_NULL_SHA;
+				break;
+			case AUTH_HMAC_SHA2_256_256:
+				buf[count++] = TLS_RSA_WITH_NULL_SHA256;
+				break;
+			case AUTH_HMAC_MD5_128:
+				buf[count++] = TLS_RSA_WITH_NULL_MD5;
+				break;
+			default:
+				break;
+		}
+		encrs = lib->crypto->create_crypter_enumerator(lib->crypto);
+		while (encrs->enumerate(encrs, &encr))
+		{
+			switch (encr)
+			{
+				case ENCR_AES_CBC:
+					switch (mac)
+					{
+						case AUTH_HMAC_SHA1_160:
+							buf[count++] = TLS_RSA_WITH_AES_128_CBC_SHA;
+							buf[count++] = TLS_RSA_WITH_AES_256_CBC_SHA;
+							break;
+						case AUTH_HMAC_SHA2_256_256:
+							buf[count++] = TLS_RSA_WITH_AES_128_CBC_SHA256;
+							buf[count++] = TLS_RSA_WITH_AES_128_CBC_SHA256;
+							break;
+						default:
+							break;
+					}
+					break;
+				case ENCR_3DES:
+					switch (mac)
+					{
+						case AUTH_HMAC_SHA1_160:
+							buf[count++] = TLS_RSA_WITH_3DES_EDE_CBC_SHA;
+							break;
+						default:
+							break;
+					}
+					break;
+				default:
+					break;
+			}
+		}
+		encrs->destroy(encrs);
+	}
+	macs->destroy(macs);
+
+	/* remove duplicates */
+	*suites = malloc(sizeof(tls_cipher_suite_t) * count);
+	for (i = 0; i < count; i++)
+	{
+		bool match = FALSE;
+
+		for (j = 0; j < res; j++)
+		{
+			if (buf[i] == (*suites)[j])
+			{
+				match = TRUE;
+				break;
+			}
+		}
+		if (!match)
+		{
+			(*suites)[res++] = buf[i];
+		}
+	}
+	return res;
+}
+
+
+METHOD(tls_crypto_t, destroy, void,
+	private_tls_crypto_t *this)
+{
+	free(this);
+}
+
+/**
+ * See header
+ */
+tls_crypto_t *tls_crypto_create()
+{
+	private_tls_crypto_t *this;
+
+	INIT(this,
+		.public = {
+			.get_cipher_suites = _get_cipher_suites,
+			.destroy = _destroy,
+		},
+	);
+
+	return &this->public;
+}