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#include <gcrypt.h>
static inline void crypt_init()
{
gcry_check_version("1.9.4");
}
static inline bool crypt_maccmp(const char *key, const char *query,
const char *hmac)
{
gcry_mac_hd_t hd;
gcry_mac_open(&hd, GCRY_MAC_HMAC_SHA256, GCRY_MAC_FLAG_SECURE, NULL);
gcry_mac_setkey(hd, key, strlen(key));
gcry_mac_write(hd, query, strlen(query));
static size_t hmacsha256_len = 32;
unsigned char hmacsha256[hmacsha256_len + 1];
gcry_mac_read(hd, hmacsha256, &hmacsha256_len);
gcry_mac_close(hd);
char hmacsha256_str[hmacsha256_len * 2 + 1];
hmacsha256_str[0] ='\0';
for (int i = 0; i < hmacsha256_len; i++)
sprintf(hmacsha256_str, "%s%02x", hmacsha256_str,
hmacsha256[i]);
return !strcmp(hmac, hmacsha256_str);
}
static inline void crypt_getnonce(char buf[], const size_t buf_len)
{
buf[0] = '\0';
const size_t nonce_len = buf_len / 2;
unsigned char nonce[nonce_len + 1];
gcry_create_nonce(nonce, nonce_len);
for (int i = 0; i < nonce_len; i++)
sprintf(buf, "%s%02x", buf, nonce[i]);
}
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