Add RFC5764 - SRTP key generation during DTLS handshake
Signed-off-by: Johan Pascal <johan.pascal@belledonne-communications.com>
diff --git a/include/mbedtls/ssl.h b/include/mbedtls/ssl.h
index a091261..55eeb18 100644
--- a/include/mbedtls/ssl.h
+++ b/include/mbedtls/ssl.h
@@ -393,6 +393,8 @@
#define MBEDTLS_TLS_EXT_SIG_ALG 13
+#define MBEDTLS_TLS_EXT_USE_SRTP 14
+
#define MBEDTLS_TLS_EXT_ALPN 16
#define MBEDTLS_TLS_EXT_ENCRYPT_THEN_MAC 22 /* 0x16 */
@@ -410,6 +412,14 @@
#define MBEDTLS_TLS_EXT_RENEGOTIATION_INFO 0xFF01
/*
+ * use_srtp extension protection profiles values as defined in http://www.iana.org/assignments/srtp-protection/srtp-protection.xhtml
+ */
+#define MBEDTLS_SRTP_AES128_CM_HMAC_SHA1_80_IANA_VALUE 0x0001
+#define MBEDTLS_SRTP_AES128_CM_HMAC_SHA1_32_IANA_VALUE 0x0002
+#define MBEDTLS_SRTP_NULL_HMAC_SHA1_80_IANA_VALUE 0x0005
+#define MBEDTLS_SRTP_NULL_HMAC_SHA1_32_IANA_VALUE 0x0006
+
+/*
* Size defines
*/
#if !defined(MBEDTLS_PSK_MAX_LEN)
@@ -851,6 +861,19 @@
#endif /* MBEDTLS_KEY_EXCHANGE_WITH_CERT_ENABLED &&
!MBEDTLS_SSL_KEEP_PEER_CERTIFICATE */
+#if defined(MBEDTLS_SSL_DTLS_SRTP)
+/*
+ * List of SRTP profiles for DTLS-SRTP
+ */
+enum mbedtls_DTLS_SRTP_protection_profiles {
+ MBEDTLS_SRTP_UNSET_PROFILE,
+ MBEDTLS_SRTP_AES128_CM_HMAC_SHA1_80,
+ MBEDTLS_SRTP_AES128_CM_HMAC_SHA1_32,
+ MBEDTLS_SRTP_NULL_HMAC_SHA1_80,
+ MBEDTLS_SRTP_NULL_HMAC_SHA1_32,
+};
+#endif /* MBEDTLS_SSL_DTLS_SRTP */
+
/*
* This structure is used for storing current session data.
*
@@ -1298,6 +1321,17 @@
const char *alpn_chosen; /*!< negotiated protocol */
#endif /* MBEDTLS_SSL_ALPN */
+#if defined(MBEDTLS_SSL_DTLS_SRTP)
+ /*
+ * use_srtp extension
+ */
+ enum mbedtls_DTLS_SRTP_protection_profiles *dtls_srtp_profiles_list; /*!< ordered list of supported srtp profile */
+ size_t dtls_srtp_profiles_list_len; /*!< number of supported profiles */
+ enum mbedtls_DTLS_SRTP_protection_profiles chosen_dtls_srtp_profile; /*!< negotiated profil */
+ unsigned char *dtls_srtp_keys; /*<! master keys and master salt for SRTP generated during handshake */
+ size_t dtls_srtp_keys_len; /*<! length in bytes of master keys and master salt for SRTP generated during handshake */
+#endif /* MBEDTLS_SSL_DTLS_SRTP */
+
/*
* Information for DTLS hello verify
*/
@@ -3120,6 +3154,31 @@
const char *mbedtls_ssl_get_alpn_protocol( const mbedtls_ssl_context *ssl );
#endif /* MBEDTLS_SSL_ALPN */
+#if defined(MBEDTLS_SSL_DTLS_SRTP)
+/**
+ * \brief Set the supported DTLS-SRTP protection profiles.
+ *
+ * \param ssl SSL context
+ * \param protos List of supported protection profiles,
+ * in decreasing preference order.
+ * \param profiles_number Number of supported profiles.
+ *
+ * \return 0 on success, or MBEDTLS_ERR_SSL_BAD_INPUT_DATA.
+ */
+int mbedtls_ssl_set_dtls_srtp_protection_profiles( mbedtls_ssl_context *ssl, const enum mbedtls_DTLS_SRTP_protection_profiles *profiles, size_t profiles_number);
+
+/**
+ * \brief Get the negotiated DTLS-SRTP Protection Profile.
+ * This function should be called after the handshake is
+ * completed.
+ *
+ * \param ssl SSL context
+ *
+ * \return Protection Profile enum member, SRTP_UNSET_PROFILE if no protocol was negotiated.
+ */
+enum mbedtls_DTLS_SRTP_protection_profiles mbedtls_ssl_get_dtls_srtp_protection_profile( const mbedtls_ssl_context *ssl);
+#endif /* MBEDTLS_SSL_DTLS_SRTP */
+
/**
* \brief Set the maximum supported version sent from the client side
* and/or accepted at the server side