src/cryptogram.cpp

   1 /**
   2  * @file /cryptron/secure.c
   3  *
   4  * @brief Functions for handling the secure data type.
   5  *
   6  * $Author: Ladar Levison $
   7  * $Website: http://lavabit.com $
   8  *
   9  */
  10
  11 #include "ies.h"
  12 #define HEADSIZE (sizeof(cryptogram_head_t))
  13
  14 size_t cryptogram_key_length(const cryptogram_t *cryptogram) {
  15         cryptogram_head_t *head = (cryptogram_head_t *)cryptogram;
  16         return head->length.key;
  17 }
  18
  19 size_t cryptogram_mac_length(const cryptogram_t *cryptogram) {
  20         cryptogram_head_t *head = (cryptogram_head_t *)cryptogram;
  21         return head->length.mac;
  22 }
  23
  24 size_t cryptogram_body_length(const cryptogram_t *cryptogram) {
  25         cryptogram_head_t *head = (cryptogram_head_t *)cryptogram;
  26         return head->length.body;
  27 }
  28
  29 size_t cryptogram_data_sum_length(const cryptogram_t *cryptogram) {
  30         cryptogram_head_t *head = (cryptogram_head_t *)cryptogram;
  31         return (head->length.key + head->length.mac + head->length.body);
  32 }
  33
  34 size_t cryptogram_total_length(const cryptogram_t *cryptogram) {
  35         cryptogram_head_t *head = (cryptogram_head_t *)cryptogram;
  36         return HEADSIZE + (head->length.key + head->length.mac + head->length.body);
  37 }
  38
  39 unsigned char * cryptogram_key_data(const cryptogram_t *cryptogram) {
  40         return (unsigned char *)cryptogram + HEADSIZE;
  41 }
  42
  43 unsigned char * cryptogram_mac_data(const cryptogram_t *cryptogram) {
  44         cryptogram_head_t *head = (cryptogram_head_t *)cryptogram;
  45         return (unsigned char *)cryptogram + (HEADSIZE + head->length.key + head->length.body);
  46 }
  47
  48 unsigned char * cryptogram_body_data(const cryptogram_t *cryptogram) {
  49         cryptogram_head_t *head = (cryptogram_head_t *)cryptogram;
  50         return (unsigned char *)cryptogram + (HEADSIZE + head->length.key);
  51 }
  52
  53 cryptogram_t * cryptogram_alloc(size_t key, size_t mac, size_t body) {
  54         cryptogram_t *cryptogram = (cryptogram_t *) malloc(HEADSIZE + key + mac + body);
  55         cryptogram_head_t *head = (cryptogram_head_t *)cryptogram;
  56         head->length.key = key;
  57         head->length.mac = mac;
  58         head->length.body = body;
  59         return cryptogram;
  60 }
  61
  62 void cryptogram_free(cryptogram_t *cryptogram) {
  63         free(cryptogram);
  64         return;
  65 }