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.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 */
30 enum {
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 
37 struct 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 
64 int tlsv1_record_set_cipher_suite(struct tlsv1_record_layer *rl,
65 				  u16 cipher_suite);
66 int tlsv1_record_change_write_cipher(struct tlsv1_record_layer *rl);
67 int tlsv1_record_change_read_cipher(struct tlsv1_record_layer *rl);
68 int 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);
70 int 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