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/*
* Copyright 2014 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include "asymmetric_key.h"
#include <openssl/x509.h>
#include <hardware/keymaster_defs.h>
#include "ec_key.h"
#include "openssl_err.h"
#include "openssl_utils.h"
#include "rsa_key.h"
#include "unencrypted_key_blob.h"
namespace keymaster {
EVP_PKEY* AsymmetricKeyFactory::ExtractEvpKey(keymaster_key_format_t key_format,
keymaster_algorithm_t expected_algorithm,
const uint8_t* key_data, size_t key_data_length,
keymaster_error_t* error) {
*error = KM_ERROR_UNSUPPORTED_KEY_FORMAT;
if (key_format != KM_KEY_FORMAT_PKCS8)
return NULL;
UniquePtr<EVP_PKEY, EVP_PKEY_Delete> pkey;
*error = convert_pkcs8_blob_to_evp(key_data, key_data_length, expected_algorithm, &pkey);
if (*error != KM_ERROR_OK)
return NULL;
return pkey.release();
}
static const keymaster_key_format_t supported_import_formats[] = {KM_KEY_FORMAT_PKCS8};
const keymaster_key_format_t* AsymmetricKeyFactory::SupportedImportFormats(size_t* format_count) {
*format_count = array_length(supported_import_formats);
return supported_import_formats;
}
static const keymaster_key_format_t supported_export_formats[] = {KM_KEY_FORMAT_X509};
const keymaster_key_format_t* AsymmetricKeyFactory::SupportedExportFormats(size_t* format_count) {
*format_count = array_length(supported_export_formats);
return supported_export_formats;
}
keymaster_error_t AsymmetricKey::LoadKey(const UnencryptedKeyBlob& blob) {
UniquePtr<EVP_PKEY, EVP_PKEY_Delete> evp_key(EVP_PKEY_new());
if (evp_key.get() == NULL)
return KM_ERROR_MEMORY_ALLOCATION_FAILED;
EVP_PKEY* tmp_pkey = evp_key.get();
const uint8_t* key_material = blob.unencrypted_key_material();
if (d2i_PrivateKey(evp_key_type(), &tmp_pkey, &key_material, blob.key_material_length()) ==
NULL)
return TranslateLastOpenSslError();
if (!EvpToInternal(evp_key.get()))
return TranslateLastOpenSslError();
return KM_ERROR_OK;
}
keymaster_error_t AsymmetricKey::key_material(UniquePtr<uint8_t[]>* material, size_t* size) const {
if (material == NULL || size == NULL)
return KM_ERROR_OUTPUT_PARAMETER_NULL;
UniquePtr<EVP_PKEY, EVP_PKEY_Delete> pkey(EVP_PKEY_new());
if (pkey.get() == NULL)
return KM_ERROR_MEMORY_ALLOCATION_FAILED;
if (!InternalToEvp(pkey.get()))
return TranslateLastOpenSslError();
*size = i2d_PrivateKey(pkey.get(), NULL /* key_data*/);
if (*size <= 0)
return TranslateLastOpenSslError();
material->reset(new uint8_t[*size]);
uint8_t* tmp = material->get();
i2d_PrivateKey(pkey.get(), &tmp);
return KM_ERROR_OK;
}
keymaster_error_t AsymmetricKey::formatted_key_material(keymaster_key_format_t format,
UniquePtr<uint8_t[]>* material,
size_t* size) const {
if (format != KM_KEY_FORMAT_X509)
return KM_ERROR_UNSUPPORTED_KEY_FORMAT;
if (material == NULL || size == NULL)
return KM_ERROR_OUTPUT_PARAMETER_NULL;
UniquePtr<EVP_PKEY, EVP_PKEY_Delete> pkey(EVP_PKEY_new());
if (!InternalToEvp(pkey.get()))
return TranslateLastOpenSslError();
int key_data_length = i2d_PUBKEY(pkey.get(), NULL);
if (key_data_length <= 0)
return TranslateLastOpenSslError();
material->reset(new uint8_t[key_data_length]);
if (material->get() == NULL)
return KM_ERROR_MEMORY_ALLOCATION_FAILED;
uint8_t* tmp = material->get();
if (i2d_PUBKEY(pkey.get(), &tmp) != key_data_length) {
material->reset();
return TranslateLastOpenSslError();
}
*size = key_data_length;
return KM_ERROR_OK;
}
} // namespace keymaster
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