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65 lines
2.0 KiB
65 lines
2.0 KiB
/* |
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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 NULL; |
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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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