secret.c

//
//  secret.c
//  secrets
//
//  Created by Anders on 08/07/2020.
//

#include <stdlib.h>
#include <string.h>
#include "secret.h"
#include "../util/stringu.h"
#include "../util/require.h"
#include "../util/hexstring.h"

Secret* secret_from_line_alloc(const char *line) {
    char *copy = stringu_copy_alloc(line);
    stringu_trim(copy);
    
    char* split[5];
    stringu_split(copy, split, "-");
    
    Secret *secret = calloc(1, sizeof(*secret));
    
    hexstring_to_bin(secret->salt, split[0], SALT_SIZE);
    hexstring_to_bin(secret->nonce, split[1], NONCE_SIZE);
    hexstring_to_bin(secret->mac, split[2], MAC_SIZE);
    
    require(strlen(split[3]) % 2 == 0, "unexpected sequence size");
    uint16_t cipher_seq_len = (uint16_t) strlen(split[3]) / 2;
    secret->cipher = malloc(cipher_seq_len);
    secret->cipher_size = cipher_seq_len;
    hexstring_to_bin(secret->cipher, split[3], cipher_seq_len);
    
    free(copy);
    return secret;
}

void secret_free(Secret* secret) {
    free(secret->cipher);
    free(secret);
}

char* secret_to_line_alloc(const Secret *secret) {
    uint32_t line_len = (SALT_SIZE + NONCE_SIZE + MAC_SIZE + secret->cipher_size) * 2 + 4;
    
    char* line = malloc(line_len);
    char* next = line;
    next = hexstring_from_bin(next, secret->salt, SALT_SIZE);
    *next++ = '-';
    next = hexstring_from_bin(next, secret->nonce, NONCE_SIZE);
    *next++ = '-';
    next = hexstring_from_bin(next, secret->mac, MAC_SIZE);
    *next++ = '-';
    next = hexstring_from_bin(next, secret->cipher, secret->cipher_size);
    *next++ = '\0';
    
    return line;
}