Implement the Opaque PRF Input TLS extension

(draft-rescorla-tls-opaque-prf-input-00.txt), and do some cleanups and
bugfixes on the way.  In particular, this fixes the buffer bounds
checks in ssl_add_clienthello_tlsext() and in ssl_add_serverhello_tlsext().

Note that the opaque PRF Input TLS extension is not compiled by default;
see CHANGES.

1 files changed, 8 insertions, 0 deletions

diff --git a/ssl/ssl3.h b/ssl/ssl3.h
index 0543cb287e..29cd3da860 100644
--- a/ssl/ssl3.h
+++ b/ssl/ssl3.h
@@ -443,6 +443,14 @@ typedef struct ssl3_state_st
 
 	int in_read_app_data;
 
+	/* Opaque PRF input as used for the current handshake.
+	 * These fields are used only if TLSEXT_TYPE_opaque_prf_input is defined
+	 * (otherwise, they are merely present to improve binary compatibility) */
+	void *client_opaque_prf_input;
+	size_t client_opaque_prf_input_len;
+	void *server_opaque_prf_input;
+	size_t server_opaque_prf_input_len;
+
 	struct	{
 		/* actually only needs to be 16+20 */
 		unsigned char cert_verify_md[EVP_MAX_MD_SIZE*2];