136 lines
4.4 KiB
C++
136 lines
4.4 KiB
C++
/*
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* Copyright 2015 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include "openssl_utils.h"
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#include <keymaster/android_keymaster_utils.h>
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#include "openssl_err.h"
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namespace keymaster {
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keymaster_error_t ec_get_group_size(const EC_GROUP* group, size_t* key_size_bits) {
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switch (EC_GROUP_get_curve_name(group)) {
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case NID_secp224r1:
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*key_size_bits = 224;
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break;
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case NID_X9_62_prime256v1:
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*key_size_bits = 256;
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break;
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case NID_secp384r1:
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*key_size_bits = 384;
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break;
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case NID_secp521r1:
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*key_size_bits = 521;
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break;
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default:
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return KM_ERROR_UNSUPPORTED_EC_FIELD;
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}
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return KM_ERROR_OK;
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}
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EC_GROUP* ec_get_group(keymaster_ec_curve_t curve) {
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switch (curve) {
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case KM_EC_CURVE_P_224:
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return EC_GROUP_new_by_curve_name(NID_secp224r1);
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break;
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case KM_EC_CURVE_P_256:
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return EC_GROUP_new_by_curve_name(NID_X9_62_prime256v1);
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break;
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case KM_EC_CURVE_P_384:
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return EC_GROUP_new_by_curve_name(NID_secp384r1);
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break;
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case KM_EC_CURVE_P_521:
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return EC_GROUP_new_by_curve_name(NID_secp521r1);
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break;
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default:
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return nullptr;
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break;
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}
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}
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static int convert_to_evp(keymaster_algorithm_t algorithm) {
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switch (algorithm) {
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case KM_ALGORITHM_RSA:
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return EVP_PKEY_RSA;
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case KM_ALGORITHM_EC:
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return EVP_PKEY_EC;
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default:
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return -1;
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};
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}
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keymaster_error_t convert_pkcs8_blob_to_evp(const uint8_t* key_data, size_t key_length,
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keymaster_algorithm_t expected_algorithm,
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UniquePtr<EVP_PKEY, EVP_PKEY_Delete>* pkey) {
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if (key_data == NULL || key_length <= 0)
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return KM_ERROR_INVALID_KEY_BLOB;
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UniquePtr<PKCS8_PRIV_KEY_INFO, PKCS8_PRIV_KEY_INFO_Delete> pkcs8(
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d2i_PKCS8_PRIV_KEY_INFO(NULL, &key_data, key_length));
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if (pkcs8.get() == NULL)
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return TranslateLastOpenSslError(true /* log_message */);
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pkey->reset(EVP_PKCS82PKEY(pkcs8.get()));
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if (!pkey->get())
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return TranslateLastOpenSslError(true /* log_message */);
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if (EVP_PKEY_type((*pkey)->type) != convert_to_evp(expected_algorithm)) {
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LOG_E("EVP key algorithm was %d, not the expected %d", EVP_PKEY_type((*pkey)->type),
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convert_to_evp(expected_algorithm));
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return KM_ERROR_INVALID_KEY_BLOB;
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}
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return KM_ERROR_OK;
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}
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keymaster_error_t KeyMaterialToEvpKey(keymaster_key_format_t key_format,
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const KeymasterKeyBlob& key_material,
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keymaster_algorithm_t expected_algorithm,
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UniquePtr<EVP_PKEY, EVP_PKEY_Delete>* pkey) {
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if (key_format != KM_KEY_FORMAT_PKCS8)
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return KM_ERROR_UNSUPPORTED_KEY_FORMAT;
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return convert_pkcs8_blob_to_evp(key_material.key_material, key_material.key_material_size,
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expected_algorithm, pkey);
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}
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keymaster_error_t EvpKeyToKeyMaterial(const EVP_PKEY* pkey, KeymasterKeyBlob* key_blob) {
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int key_data_size = i2d_PrivateKey(pkey, NULL /* key_data*/);
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if (key_data_size <= 0)
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return TranslateLastOpenSslError();
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if (!key_blob->Reset(key_data_size))
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return KM_ERROR_MEMORY_ALLOCATION_FAILED;
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uint8_t* tmp = key_blob->writable_data();
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i2d_PrivateKey(pkey, &tmp);
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return KM_ERROR_OK;
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}
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size_t ec_group_size_bits(EC_KEY* ec_key) {
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const EC_GROUP* group = EC_KEY_get0_group(ec_key);
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UniquePtr<BN_CTX, BN_CTX_Delete> bn_ctx(BN_CTX_new());
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UniquePtr<BIGNUM, BIGNUM_Delete> order(BN_new());
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if (!EC_GROUP_get_order(group, order.get(), bn_ctx.get())) {
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LOG_E("Failed to get EC group order", 0);
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return 0;
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}
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return BN_num_bits(order.get());
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}
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} // namespace keymaster
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