InfoHash
PublicKey::getId() const
{
InfoHash id;
size_t sz = id.size();
if (gnutls_pubkey_get_key_id(pk, 0, id.data(), &sz) != GNUTLS_E_SUCCESS || sz != id.size())
return {};
return id;
}
InfoHash
Certificate::getId() const
{
if (not cert)
return {};
InfoHash id;
size_t sz = id.size();
if (gnutls_x509_crt_get_key_id(cert, 0, id.data(), &sz) != GNUTLS_E_SUCCESS || sz != id.size())
throw CryptoException("Can't get certificate public key ID.");
return id;
}
InfoHash
InfoHash::get(const uint8_t* data, size_t data_len)
{
InfoHash h;
size_t s = h.size();
const gnutls_datum_t gnudata = {(uint8_t*)data, (unsigned)data_len};
const gnutls_digest_algorithm_t algo = (HASH_LEN == 64) ? GNUTLS_DIG_SHA512 : (
(HASH_LEN == 32) ? GNUTLS_DIG_SHA256 : (
(HASH_LEN == 20) ? GNUTLS_DIG_SHA1 :
GNUTLS_DIG_NULL ));
static_assert(algo != GNUTLS_DIG_NULL, "Can't find hash function to use.");
int rc = gnutls_fingerprint(algo, &gnudata, h.data(), &s);
if (rc == 0 && s == HASH_LEN)
return h;
throw std::string("Error while hashing");
}
