C++ (Cpp) _gnutls_x509_read_der_intの例

コード例 #1

ファイル: key_decode.c プロジェクト: MihirKulkarni/TLS_extension

/* reads DSA's Y
 * from the certificate 
 * only sets params[3]
 */
int
_gnutls_x509_read_dsa_pubkey (opaque * der, int dersize, gnutls_pk_params_st * params)
{
  /* do not set a number */
  params->params_nr = 0;
  return _gnutls_x509_read_der_int (der, dersize, &params->params[3]);
}

コード例 #2

ファイル: mpi.c プロジェクト: ystk/debian-gnutls26

/* reads DSA's Y
 * from the certificate 
 * only sets params[3]
 */
int
_gnutls_x509_read_dsa_pubkey (opaque * der, int dersize, bigint_t * params)
{
  return _gnutls_x509_read_der_int (der, dersize, &params[3]);
}

コード例 #3

ファイル: privkey_pkcs8.c プロジェクト: gnutls/gnutls

/* Decodes an DSA privateKey and params from a PKCS8 structure.
 */
static int
_decode_pkcs8_dsa_key(ASN1_TYPE pkcs8_asn, gnutls_x509_privkey_t pkey)
{
	int ret;
	gnutls_datum_t tmp = {NULL, 0};

	gnutls_pk_params_init(&pkey->params);

	ret = _gnutls_x509_read_value(pkcs8_asn, "privateKey", &tmp);
	if (ret < 0) {
		gnutls_assert();
		goto error;
	}

	ret =
	    _gnutls_x509_read_der_int(tmp.data, tmp.size,
				      &pkey->params.params[4]);
	_gnutls_free_key_datum(&tmp);

	if (ret < 0) {
		gnutls_assert();
		goto error;
	}

	ret =
	    _gnutls_x509_read_value(pkcs8_asn,
				    "privateKeyAlgorithm.parameters",
				    &tmp);
	if (ret < 0) {
		gnutls_assert();
		goto error;
	}

	ret =
	    _gnutls_x509_read_pubkey_params(GNUTLS_PK_DSA, tmp.data,
					    tmp.size, &pkey->params);
	_gnutls_free_datum(&tmp);
	if (ret < 0) {
		gnutls_assert();
		goto error;
	}

	if (_gnutls_mpi_cmp_ui(pkey->params.params[0], 0) == 0) {
		gnutls_assert();
		ret = GNUTLS_E_ILLEGAL_PARAMETER;
		goto error;
	}

	/* the public key can be generated as g^x mod p */
	ret = _gnutls_mpi_init(&pkey->params.params[3]);
	if (ret < 0) {
		gnutls_assert();
		goto error;
	}

	ret = _gnutls_mpi_powm(pkey->params.params[3], pkey->params.params[2],
			 pkey->params.params[4], pkey->params.params[0]);
	if (ret < 0) {
		gnutls_assert();
		goto error;
	}

	pkey->params.algo = GNUTLS_PK_DSA;
	pkey->params.params_nr = DSA_PRIVATE_PARAMS;

	ret =
	    _gnutls_asn1_encode_privkey(&pkey->key,
					&pkey->params);
	if (ret < 0) {
		gnutls_assert();
		goto error;
	}

	return 0;

 error:
	if (pkey->params.params_nr != DSA_PRIVATE_PARAMS)
		_gnutls_mpi_release(&pkey->params.params[4]);
	return ret;
}