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/*
* Copyright 2015-2016 Jason A. Donenfeld <Jason@zx2c4.com>. All Rights Reserved.
*
* See doc/protocol.md for more info
*/
#ifndef MESSAGES_H
#define MESSAGES_H
#include "noise.h"
#include "cookie.h"
enum message_type {
MESSAGE_INVALID = 0,
MESSAGE_HANDSHAKE_INITIATION = 1,
MESSAGE_HANDSHAKE_RESPONSE = 2,
MESSAGE_HANDSHAKE_COOKIE = 3,
MESSAGE_DATA = 4,
MESSAGE_TOTAL = 5
};
struct message_header {
u8 type;
} __packed;
struct message_macs {
u8 mac1[COOKIE_LEN];
u8 mac2[COOKIE_LEN];
} __packed;
struct message_handshake_initiation {
struct message_header header;
__le32 sender_index;
u8 unencrypted_ephemeral[NOISE_PUBLIC_KEY_LEN];
u8 encrypted_static[noise_encrypted_len(NOISE_PUBLIC_KEY_LEN)];
u8 encrypted_timestamp[noise_encrypted_len(NOISE_TIMESTAMP_LEN)];
struct message_macs macs;
} __packed;
struct message_handshake_response {
struct message_header header;
__le32 sender_index;
__le32 receiver_index;
u8 unencrypted_ephemeral[NOISE_PUBLIC_KEY_LEN];
u8 encrypted_nothing[noise_encrypted_len(0)];
struct message_macs macs;
} __packed;
struct message_handshake_cookie {
struct message_header header;
__le32 receiver_index;
u8 salt[COOKIE_SALT_LEN];
u8 encrypted_cookie[noise_encrypted_len(COOKIE_LEN)];
} __packed;
struct message_data {
struct message_header header;
__le32 key_idx;
__le64 counter;
u8 encrypted_data[];
} __packed;
#define message_data_len(plain_len) (noise_encrypted_len(plain_len) + sizeof(struct message_data))
enum message_alignments {
MESSAGE_DATA_TARGET_OFFSET = sizeof(struct message_data),
MESSAGE_DATA_TARGET_OPTIMAL_ALIGNMENT = 32, /* Per intel AVX recommendations */
MESSAGE_PADDING_MULTIPLE = 16,
MESSAGE_MINIMUM_LENGTH = message_data_len(0)
};
static inline enum message_type message_determine_type(void *src, size_t src_len)
{
struct message_header *header = src;
if (unlikely(src_len < sizeof(struct message_header)))
return MESSAGE_INVALID;
if (header->type == MESSAGE_DATA && src_len >= MESSAGE_MINIMUM_LENGTH)
return MESSAGE_DATA;
if (header->type == MESSAGE_HANDSHAKE_INITIATION && src_len == sizeof(struct message_handshake_initiation))
return MESSAGE_HANDSHAKE_INITIATION;
if (header->type == MESSAGE_HANDSHAKE_RESPONSE && src_len == sizeof(struct message_handshake_response))
return MESSAGE_HANDSHAKE_RESPONSE;
if (header->type == MESSAGE_HANDSHAKE_COOKIE && src_len == sizeof(struct message_handshake_cookie))
return MESSAGE_HANDSHAKE_COOKIE;
return MESSAGE_INVALID;
}
#endif
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