tlsv1_record.h

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#ifndef TLSV1_RECORD_H
#define TLSV1_RECORD_H

#include "crypto.h"

#define TLS_MAX_WRITE_MAC_SECRET_LEN 20
#define TLS_MAX_WRITE_KEY_LEN 32
#define TLS_MAX_IV_LEN 16
#define TLS_MAX_KEY_BLOCK_LEN (2 * (TLS_MAX_WRITE_MAC_SECRET_LEN + \
                                    TLS_MAX_WRITE_KEY_LEN + TLS_MAX_IV_LEN))

#define TLS_SEQ_NUM_LEN 8
#define TLS_RECORD_HEADER_LEN 5

/* ContentType */
enum {
        TLS_CONTENT_TYPE_CHANGE_CIPHER_SPEC = 20,
        TLS_CONTENT_TYPE_ALERT = 21,
        TLS_CONTENT_TYPE_HANDSHAKE = 22,
        TLS_CONTENT_TYPE_APPLICATION_DATA = 23
};

struct tlsv1_record_layer {
        u8 write_mac_secret[TLS_MAX_WRITE_MAC_SECRET_LEN];
        u8 read_mac_secret[TLS_MAX_WRITE_MAC_SECRET_LEN];
        u8 write_key[TLS_MAX_WRITE_KEY_LEN];
        u8 read_key[TLS_MAX_WRITE_KEY_LEN];
        u8 write_iv[TLS_MAX_IV_LEN];
        u8 read_iv[TLS_MAX_IV_LEN];

        size_t hash_size;
        size_t key_material_len;
        size_t iv_size; /* also block_size */

        enum crypto_hash_alg hash_alg;
        enum crypto_cipher_alg cipher_alg;

        u8 write_seq_num[TLS_SEQ_NUM_LEN];
        u8 read_seq_num[TLS_SEQ_NUM_LEN];

        u16 cipher_suite;
        u16 write_cipher_suite;
        u16 read_cipher_suite;

        struct crypto_cipher *write_cbc;
        struct crypto_cipher *read_cbc;
};


int tlsv1_record_set_cipher_suite(struct tlsv1_record_layer *rl,
                                  u16 cipher_suite);
int tlsv1_record_change_write_cipher(struct tlsv1_record_layer *rl);
int tlsv1_record_change_read_cipher(struct tlsv1_record_layer *rl);
int tlsv1_record_send(struct tlsv1_record_layer *rl, u8 content_type, u8 *buf,
                      size_t buf_size, size_t payload_len, size_t *out_len);
int tlsv1_record_receive(struct tlsv1_record_layer *rl,
                         const u8 *in_data, size_t in_len,
                         u8 *out_data, size_t *out_len, u8 *alert);

#endif /* TLSV1_RECORD_H */