66 lines
2.0 KiB
C++
66 lines
2.0 KiB
C++
/*
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* Copyright (C) 2012 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 <stdint.h>
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#include <string.h>
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#include <sys/types.h>
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#include <unistd.h>
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#include <keystore/keystore.h>
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/**
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* When a key is being migrated from a software keymaster implementation
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* to a hardware keymaster implementation, the first 4 bytes of the key_blob
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* given to the hardware implementation will be equal to SOFT_KEY_MAGIC.
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* The hardware implementation should import these PKCS#8 format keys which
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* are encoded like this:
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*
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* 4-byte SOFT_KEY_MAGIC
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*
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* 4-byte 32-bit integer big endian for public_key_length. This may be zero
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* length which indicates the public key should be derived from the
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* private key.
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*
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* public_key_length bytes of public key (may be empty)
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*
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* 4-byte 32-bit integer big endian for private_key_length
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*
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* private_key_length bytes of private key
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*/
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static const uint8_t SOFT_KEY_MAGIC[] = { 'P', 'K', '#', '8' };
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size_t get_softkey_header_size() {
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return sizeof(SOFT_KEY_MAGIC);
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}
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uint8_t* add_softkey_header(uint8_t* key_blob, size_t key_blob_length) {
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if (key_blob_length < sizeof(SOFT_KEY_MAGIC)) {
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return nullptr;
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}
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memcpy(key_blob, SOFT_KEY_MAGIC, sizeof(SOFT_KEY_MAGIC));
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return key_blob + sizeof(SOFT_KEY_MAGIC);
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}
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bool is_softkey(const uint8_t* key_blob, const size_t key_blob_length) {
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if (key_blob_length < sizeof(SOFT_KEY_MAGIC)) {
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return false;
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}
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return !memcmp(key_blob, SOFT_KEY_MAGIC, sizeof(SOFT_KEY_MAGIC));
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}
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