tlsv1_record.h revision 8d520ff1dc2da35cdca849e982051b86468016d8 
1/*
2 * TLSv1 Record Protocol
3 * Copyright (c) 2006-2007, Jouni Malinen <j@w1.fi>
4 *
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License version 2 as
7 * published by the Free Software Foundation.
8 *
9 * Alternatively, this software may be distributed under the terms of BSD
10 * license.
11 *
12 * See README and COPYING for more details.
13 */
14
15#ifndef TLSV1_RECORD_H
16#define TLSV1_RECORD_H
17
18#include "crypto/crypto.h"
19
20#define TLS_MAX_WRITE_MAC_SECRET_LEN 20
21#define TLS_MAX_WRITE_KEY_LEN 32
22#define TLS_MAX_IV_LEN 16
23#define TLS_MAX_KEY_BLOCK_LEN (2 * (TLS_MAX_WRITE_MAC_SECRET_LEN + \
24				    TLS_MAX_WRITE_KEY_LEN + TLS_MAX_IV_LEN))
25
26#define TLS_SEQ_NUM_LEN 8
27#define TLS_RECORD_HEADER_LEN 5
28
29/* ContentType */
30enum {
31	TLS_CONTENT_TYPE_CHANGE_CIPHER_SPEC = 20,
32	TLS_CONTENT_TYPE_ALERT = 21,
33	TLS_CONTENT_TYPE_HANDSHAKE = 22,
34	TLS_CONTENT_TYPE_APPLICATION_DATA = 23
35};
36
37struct tlsv1_record_layer {
38	u8 write_mac_secret[TLS_MAX_WRITE_MAC_SECRET_LEN];
39	u8 read_mac_secret[TLS_MAX_WRITE_MAC_SECRET_LEN];
40	u8 write_key[TLS_MAX_WRITE_KEY_LEN];
41	u8 read_key[TLS_MAX_WRITE_KEY_LEN];
42	u8 write_iv[TLS_MAX_IV_LEN];
43	u8 read_iv[TLS_MAX_IV_LEN];
44
45	size_t hash_size;
46	size_t key_material_len;
47	size_t iv_size; /* also block_size */
48
49	enum crypto_hash_alg hash_alg;
50	enum crypto_cipher_alg cipher_alg;
51
52	u8 write_seq_num[TLS_SEQ_NUM_LEN];
53	u8 read_seq_num[TLS_SEQ_NUM_LEN];
54
55	u16 cipher_suite;
56	u16 write_cipher_suite;
57	u16 read_cipher_suite;
58
59	struct crypto_cipher *write_cbc;
60	struct crypto_cipher *read_cbc;
61};
62
63
64int tlsv1_record_set_cipher_suite(struct tlsv1_record_layer *rl,
65				  u16 cipher_suite);
66int tlsv1_record_change_write_cipher(struct tlsv1_record_layer *rl);
67int tlsv1_record_change_read_cipher(struct tlsv1_record_layer *rl);
68int tlsv1_record_send(struct tlsv1_record_layer *rl, u8 content_type, u8 *buf,
69		      size_t buf_size, size_t payload_len, size_t *out_len);
70int tlsv1_record_receive(struct tlsv1_record_layer *rl,
71			 const u8 *in_data, size_t in_len,
72			 u8 *out_data, size_t *out_len, u8 *alert);
73
74#endif /* TLSV1_RECORD_H */
75