X-Git-Url: https://git.openssl.org/gitweb/?p=openssl.git;a=blobdiff_plain;f=ssl%2Fssl3.h;h=efff233fbdb3c0e8d082791c30d00cb84acaf019;hp=29cb184c68a2b0dbb7131a0d876ecae98ea08675;hb=e94a6c0ede623960728415b68650a595e48f5a43;hpb=707b026d7871eb12c23671c975e6a15a8c331785

diff --git a/ssl/ssl3.h b/ssl/ssl3.h
index 29cb184c68..efff233fbd 100644
--- a/ssl/ssl3.h
+++ b/ssl/ssl3.h
@@ -128,9 +128,14 @@
 extern "C" {
 #endif
 
-/* Signalling cipher suite value: from draft-ietf-tls-renegotiation-03.txt */
+/* Signalling cipher suite value from RFC 5746
+ * (TLS_EMPTY_RENEGOTIATION_INFO_SCSV) */
 #define SSL3_CK_SCSV				0x030000FF
 
+/* Signalling cipher suite value from draft-ietf-tls-downgrade-scsv-00
+ * (TLS_FALLBACK_SCSV) */
+#define SSL3_CK_FALLBACK_SCSV			0x03005600
+
 #define SSL3_CK_RSA_NULL_MD5			0x03000001
 #define SSL3_CK_RSA_NULL_SHA			0x03000002
 #define SSL3_CK_RSA_RC4_40_MD5 			0x03000003
@@ -428,8 +433,12 @@ typedef struct ssl3_buffer_st
 #define TLS1_FLAGS_TLS_PADDING_BUG		0x0008
 #define TLS1_FLAGS_SKIP_CERT_VERIFY		0x0010
 #define TLS1_FLAGS_KEEP_HANDSHAKE		0x0020
+/*
+ * Set when the handshake is ready to process peer's ChangeCipherSpec message.
+ * Cleared after the message has been processed.
+ */
 #define SSL3_FLAGS_CCS_OK			0x0080
- 
+
 /* SSL3_FLAGS_SGC_RESTART_DONE is set when we
  * restart a handshake because of MS SGC and so prevents us
  * from restarting the handshake in a loop. It's reset on a
@@ -493,8 +502,11 @@ typedef struct ssl3_state_st
 	 * and freed and MD_CTX-es for all required digests are stored in
 	 * this array */
 	EVP_MD_CTX **handshake_dgst;
-	/* this is set whenerver we see a change_cipher_spec message
-	 * come in when we are not looking for one */
+	/*
+	 * Set whenever an expected ChangeCipherSpec message is processed.
+	 * Unset when the peer's Finished message is received.
+	 * Unexpected ChangeCipherSpec messages trigger a fatal alert.
+	 */
 	int change_cipher_spec;
 
 	int warn_alert;