diff --git a/library/ssl_msg.c b/library/ssl_msg.c index 54900307a3..89c1ab9325 100644 --- a/library/ssl_msg.c +++ b/library/ssl_msg.c @@ -3280,17 +3280,21 @@ int mbedtls_ssl_prepare_handshake_record(mbedtls_ssl_context *ssl) * expected `message_seq` for the incoming and outgoing * handshake messages. */ - ssl->handshake->in_msg_seq = recv_msg_seq; - ssl->handshake->out_msg_seq = recv_msg_seq; + if ((ssl->handshake->in_msg_seq == 0) && (recv_msg_seq > 0)) { + MBEDTLS_SSL_DEBUG_MSG(1, ("shift slots by %u", recv_msg_seq)); + ssl_buffering_shift_slots(ssl, recv_msg_seq); + ssl->handshake->in_msg_seq = recv_msg_seq; + ssl->handshake->out_msg_seq = recv_msg_seq; - /* Epoch should be 0 for initial handshakes */ - if (ssl->in_ctr[0] != 0 || ssl->in_ctr[1] != 0) { - MBEDTLS_SSL_DEBUG_MSG(1, ("bad client hello message")); - return MBEDTLS_ERR_SSL_ILLEGAL_PARAMETER; + /* Epoch should be 0 for initial handshakes */ + if (ssl->in_ctr[0] != 0 || ssl->in_ctr[1] != 0) { + MBEDTLS_SSL_DEBUG_MSG(1, ("bad client hello message")); + return MBEDTLS_ERR_SSL_ILLEGAL_PARAMETER; + } + + memcpy(&ssl->cur_out_ctr[2], ssl->in_ctr + 2, + sizeof(ssl->cur_out_ctr) - 2); } - - memcpy(&ssl->cur_out_ctr[2], ssl->in_ctr + 2, - sizeof(ssl->cur_out_ctr) - 2); } else if (mbedtls_ssl_is_handshake_over(ssl) == 1) { /* In case of a post-handshake ClientHello that initiates a * renegotiation check that the handshake message sequence