| /* |
| * Copyright 2015 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 "openssl_utils.h" |
| |
| #include <keymaster/android_keymaster_utils.h> |
| |
| #include "openssl_err.h" |
| |
| namespace keymaster { |
| |
| static int convert_to_evp(keymaster_algorithm_t algorithm) { |
| switch (algorithm) { |
| case KM_ALGORITHM_RSA: |
| return EVP_PKEY_RSA; |
| case KM_ALGORITHM_EC: |
| return EVP_PKEY_EC; |
| default: |
| return -1; |
| }; |
| } |
| |
| keymaster_error_t convert_pkcs8_blob_to_evp(const uint8_t* key_data, size_t key_length, |
| keymaster_algorithm_t expected_algorithm, |
| UniquePtr<EVP_PKEY, EVP_PKEY_Delete>* pkey) { |
| if (key_data == NULL || key_length <= 0) |
| return KM_ERROR_INVALID_KEY_BLOB; |
| |
| UniquePtr<PKCS8_PRIV_KEY_INFO, PKCS8_PRIV_KEY_INFO_Delete> pkcs8( |
| d2i_PKCS8_PRIV_KEY_INFO(NULL, &key_data, key_length)); |
| if (pkcs8.get() == NULL) |
| return TranslateLastOpenSslError(true /* log_message */); |
| |
| pkey->reset(EVP_PKCS82PKEY(pkcs8.get())); |
| if (!pkey->get()) |
| return TranslateLastOpenSslError(true /* log_message */); |
| |
| if (EVP_PKEY_type((*pkey)->type) != convert_to_evp(expected_algorithm)) { |
| LOG_E("EVP key algorithm was %d, not the expected %d", EVP_PKEY_type((*pkey)->type), |
| convert_to_evp(expected_algorithm)); |
| return KM_ERROR_INVALID_KEY_BLOB; |
| } |
| |
| return KM_ERROR_OK; |
| } |
| |
| keymaster_error_t KeyMaterialToEvpKey(keymaster_key_format_t key_format, |
| const KeymasterKeyBlob& key_material, |
| keymaster_algorithm_t expected_algorithm, |
| UniquePtr<EVP_PKEY, EVP_PKEY_Delete>* pkey) { |
| if (key_format != KM_KEY_FORMAT_PKCS8) |
| return KM_ERROR_UNSUPPORTED_KEY_FORMAT; |
| |
| return convert_pkcs8_blob_to_evp(key_material.key_material, key_material.key_material_size, |
| expected_algorithm, pkey); |
| } |
| |
| keymaster_error_t EvpKeyToKeyMaterial(const EVP_PKEY* pkey, KeymasterKeyBlob* key_blob) { |
| int key_data_size = i2d_PrivateKey(pkey, NULL /* key_data*/); |
| if (key_data_size <= 0) |
| return TranslateLastOpenSslError(); |
| |
| if (!key_blob->Reset(key_data_size)) |
| return KM_ERROR_MEMORY_ALLOCATION_FAILED; |
| |
| uint8_t* tmp = key_blob->writable_data(); |
| i2d_PrivateKey(pkey, &tmp); |
| |
| return KM_ERROR_OK; |
| } |
| |
| } // namespace keymaster |