EAP-TLS and EAP-TTLS use different constant MSK PRF label

src/libcharon/plugins/eap_tls/eap_tls.c

@@ -424,7 +424,8 @@ static eap_tls_t *eap_tls_create(identification_t *server,
 		},
 		.is_server = is_server,
 	);
-	this->tls = tls_create(is_server, server, peer);
+	/* MSK PRF ASCII constant label according to EAP-TLS RFC 5216 */
+	this->tls = tls_create(is_server, server, peer, "client EAP encryption");
 
 	return &this->public;
 }

src/libcharon/plugins/eap_ttls/eap_ttls.c

@@ -424,7 +424,8 @@ static eap_ttls_t *eap_ttls_create(identification_t *server,
 		},
 		.is_server = is_server,
 	);
-	this->tls = tls_create(is_server, server, peer);
+	/* MSK PRF ASCII constant label according to EAP-TTLS RFC 5281 */
+	this->tls = tls_create(is_server, server, peer, "ttls keying material");
 
 	return &this->public;
 }

src/libtls/tls.c

@@ -172,7 +172,7 @@ METHOD(tls_t, destroy, void,
  * See header
  */
 tls_t *tls_create(bool is_server, identification_t *server,
-				  identification_t *peer)
+				  identification_t *peer, char *msk_label)
 {
 	private_tls_t *this;
 
@@ -193,7 +193,7 @@ tls_t *tls_create(bool is_server, identification_t *server,
 		.peer = peer->clone(peer),
 	);
 
-	this->crypto = tls_crypto_create(&this->public);
+	this->crypto = tls_crypto_create(&this->public, msk_label);
 	if (is_server)
 	{
 		this->handshake = &tls_server_create(&this->public, this->crypto,

src/libtls/tls.h

@@ -162,9 +162,10 @@ struct tls_t {
  * @param is_server		TRUE to act as server, FALSE for client
  * @param server		server identity
  * @param peer			peer identity
+ * @param msk_label		ASCII string constant used as seed for MSK PRF
  * @return				TLS stack
  */
 tls_t *tls_create(bool is_server, identification_t *server,
-				  identification_t *peer);
+				  identification_t *peer, char *msk_label);
 
 #endif /** TLS_H_ @}*/

src/libtls/tls_crypto.c

@@ -316,9 +316,14 @@ struct private_tls_crypto_t {
 	chunk_t iv_out;
 
 	/**
-	 * EAP-TLS MSK
+	 * EAP-[T]TLS MSK
 	 */
 	chunk_t msk;
+
+	/**
+	 * ASCII string constant used as seed for EAP-[T]TLS MSK PRF
+	 */
+	char *msk_label;
 };
 
 typedef struct {
@@ -855,7 +860,7 @@ METHOD(tls_crypto_t, derive_eap_msk, void,
 	seed = chunk_cata("cc", client_random, server_random);
 	free(this->msk.ptr);
 	this->msk = chunk_alloc(64);
-	this->prf->get_bytes(this->prf, "client EAP encryption", seed,
+	this->prf->get_bytes(this->prf, this->msk_label, seed,
 						 this->msk.len, this->msk.ptr);
 }
 
@@ -884,7 +889,7 @@ METHOD(tls_crypto_t, destroy, void,
 /**
  * See header
  */
-tls_crypto_t *tls_crypto_create(tls_t *tls)
+tls_crypto_t *tls_crypto_create(tls_t *tls, char *msk_label)
 {
 	private_tls_crypto_t *this;
 
@@ -904,6 +909,7 @@ tls_crypto_t *tls_crypto_create(tls_t *tls)
 			.destroy = _destroy,
 		},
 		.tls = tls,
+		.msk_label = msk_label
 	);
 
 	build_cipher_suite_list(this);

src/libtls/tls_crypto.h

@@ -359,7 +359,9 @@ struct tls_crypto_t {
 
 /**
  * Create a tls_crypto instance.
+ *
+ * @param msk_label		ASCII string constant used as seed for MSK PRF
  */
-tls_crypto_t *tls_crypto_create(tls_t *tls);
+tls_crypto_t *tls_crypto_create(tls_t *tls, char *msk_label);
 
 #endif /** TLS_CRYPTO_H_ @}*/