548 lines
26 KiB
C
548 lines
26 KiB
C
/*
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* Copyright (C) 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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#ifndef ANDROID_HARDWARE_KEYMASTER1_H
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#define ANDROID_HARDWARE_KEYMASTER1_H
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#include <hardware/keymaster_common.h>
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#include <hardware/keymaster_defs.h>
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__BEGIN_DECLS
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/**
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* Keymaster1 device definition
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*/
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struct keymaster1_device {
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/**
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* Common methods of the keymaster device. This *must* be the first member of
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* keymaster_device as users of this structure will cast a hw_device_t to
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* keymaster_device pointer in contexts where it's known the hw_device_t references a
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* keymaster_device.
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*/
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struct hw_device_t common;
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/**
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* THIS IS DEPRECATED. Use the new "module_api_version" and "hal_api_version"
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* fields in the keymaster_module initialization instead.
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*/
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uint32_t client_version;
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/**
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* See flags defined for keymaster0_devices::flags in keymaster_common.h
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*/
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uint32_t flags;
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void* context;
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/**
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* \deprecated Generates a public and private key. The key-blob returned is opaque and must
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* subsequently provided for signing and verification.
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*
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* Returns: 0 on success or an error code less than 0.
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*/
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int (*generate_keypair)(const struct keymaster1_device* dev, const keymaster_keypair_t key_type,
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const void* key_params, uint8_t** key_blob, size_t* key_blob_length);
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/**
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* \deprecated Imports a public and private key pair. The imported keys will be in PKCS#8 format
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* with DER encoding (Java standard). The key-blob returned is opaque and will be subsequently
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* provided for signing and verification.
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*
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* Returns: 0 on success or an error code less than 0.
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*/
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int (*import_keypair)(const struct keymaster1_device* dev, const uint8_t* key,
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const size_t key_length, uint8_t** key_blob, size_t* key_blob_length);
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/**
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* \deprecated Gets the public key part of a key pair. The public key must be in X.509 format
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* (Java standard) encoded byte array.
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*
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* Returns: 0 on success or an error code less than 0. On error, x509_data
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* should not be allocated.
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*/
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int (*get_keypair_public)(const struct keymaster1_device* dev, const uint8_t* key_blob,
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const size_t key_blob_length, uint8_t** x509_data,
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size_t* x509_data_length);
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/**
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* \deprecated Deletes the key pair associated with the key blob.
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*
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* This function is optional and should be set to NULL if it is not
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* implemented.
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*
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* Returns 0 on success or an error code less than 0.
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*/
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int (*delete_keypair)(const struct keymaster1_device* dev, const uint8_t* key_blob,
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const size_t key_blob_length);
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/**
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* \deprecated Deletes all keys in the hardware keystore. Used when keystore is reset
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* completely.
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*
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* This function is optional and should be set to NULL if it is not
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* implemented.
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*
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* Returns 0 on success or an error code less than 0.
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*/
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int (*delete_all)(const struct keymaster1_device* dev);
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/**
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* \deprecated Signs data using a key-blob generated before. This can use either an asymmetric
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* key or a secret key.
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*
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* Returns: 0 on success or an error code less than 0.
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*/
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int (*sign_data)(const struct keymaster1_device* dev, const void* signing_params,
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const uint8_t* key_blob, const size_t key_blob_length, const uint8_t* data,
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const size_t data_length, uint8_t** signed_data, size_t* signed_data_length);
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/**
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* \deprecated Verifies data signed with a key-blob. This can use either an asymmetric key or a
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* secret key.
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*
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* Returns: 0 on successful verification or an error code less than 0.
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*/
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int (*verify_data)(const struct keymaster1_device* dev, const void* signing_params,
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const uint8_t* key_blob, const size_t key_blob_length,
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const uint8_t* signed_data, const size_t signed_data_length,
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const uint8_t* signature, const size_t signature_length);
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/**
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* Gets algorithms supported.
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*
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* \param[in] dev The keymaster device structure.
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*
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* \param[out] algorithms Array of algorithms supported. The caller takes ownership of the
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* array and must free() it.
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*
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* \param[out] algorithms_length Length of \p algorithms.
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*/
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keymaster_error_t (*get_supported_algorithms)(const struct keymaster1_device* dev,
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keymaster_algorithm_t** algorithms,
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size_t* algorithms_length);
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/**
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* Gets the block modes supported for the specified algorithm.
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*
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* \param[in] dev The keymaster device structure.
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*
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* \param[in] algorithm The algorithm for which supported modes will be returned.
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*
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* \param[out] modes Array of modes supported. The caller takes ownership of the array and must
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* free() it.
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*
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* \param[out] modes_length Length of \p modes.
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*/
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keymaster_error_t (*get_supported_block_modes)(const struct keymaster1_device* dev,
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keymaster_algorithm_t algorithm,
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keymaster_purpose_t purpose,
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keymaster_block_mode_t** modes,
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size_t* modes_length);
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/**
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* Gets the padding modes supported for the specified algorithm. Caller assumes ownership of
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* the allocated array.
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*
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* \param[in] dev The keymaster device structure.
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*
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* \param[in] algorithm The algorithm for which supported padding modes will be returned.
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*
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* \param[out] modes Array of padding modes supported. The caller takes ownership of the array
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* and must free() it.
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*
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* \param[out] modes_length Length of \p modes.
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*/
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keymaster_error_t (*get_supported_padding_modes)(const struct keymaster1_device* dev,
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keymaster_algorithm_t algorithm,
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keymaster_purpose_t purpose,
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keymaster_padding_t** modes,
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size_t* modes_length);
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/**
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* Gets the digests supported for the specified algorithm. Caller assumes ownership of the
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* allocated array.
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*
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* \param[in] dev The keymaster device structure.
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*
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* \param[in] algorithm The algorithm for which supported digests will be returned.
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*
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* \param[out] digests Array of digests supported. The caller takes ownership of the array and
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* must free() it.
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*
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* \param[out] digests_length Length of \p digests.
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*/
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keymaster_error_t (*get_supported_digests)(const struct keymaster1_device* dev,
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keymaster_algorithm_t algorithm,
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keymaster_purpose_t purpose,
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keymaster_digest_t** digests,
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size_t* digests_length);
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/**
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* Gets the key import formats supported for keys of the specified algorithm. Caller assumes
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* ownership of the allocated array.
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*
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* \param[in] dev The keymaster device structure.
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*
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* \param[in] algorithm The algorithm for which supported formats will be returned.
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*
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* \param[out] formats Array of formats supported. The caller takes ownership of the array and
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* must free() it.
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*
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* \param[out] formats_length Length of \p formats.
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*/
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keymaster_error_t (*get_supported_import_formats)(const struct keymaster1_device* dev,
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keymaster_algorithm_t algorithm,
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keymaster_key_format_t** formats,
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size_t* formats_length);
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/**
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* Gets the key export formats supported for keys of the specified algorithm. Caller assumes
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* ownership of the allocated array.
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*
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* \param[in] dev The keymaster device structure.
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*
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* \param[in] algorithm The algorithm for which supported formats will be returned.
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*
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* \param[out] formats Array of formats supported. The caller takes ownership of the array and
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* must free() it.
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*
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* \param[out] formats_length Length of \p formats.
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*/
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keymaster_error_t (*get_supported_export_formats)(const struct keymaster1_device* dev,
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keymaster_algorithm_t algorithm,
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keymaster_key_format_t** formats,
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size_t* formats_length);
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/**
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* Adds entropy to the RNG used by keymaster. Entropy added through this method is guaranteed
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* not to be the only source of entropy used, and the mixing function is required to be secure,
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* in the sense that if the RNG is seeded (from any source) with any data the attacker cannot
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* predict (or control), then the RNG output is indistinguishable from random. Thus, if the
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* entropy from any source is good, the output will be good.
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*
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* \param[in] dev The keymaster device structure.
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*
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* \param[in] data Random data to be mixed in.
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*
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* \param[in] data_length Length of \p data.
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*/
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keymaster_error_t (*add_rng_entropy)(const struct keymaster1_device* dev, const uint8_t* data,
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size_t data_length);
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/**
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* Generates a key, or key pair, returning a key blob and/or a description of the key.
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*
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* Key generation parameters are defined as keymaster tag/value pairs, provided in \p params.
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* See keymaster_tag_t for the full list. Some values that are always required for generation
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* of useful keys are:
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*
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* - KM_TAG_ALGORITHM;
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* - KM_TAG_PURPOSE; and
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* - (KM_TAG_USER_SECURE_ID and KM_TAG_USER_AUTH_TYPE) or KM_TAG_NO_AUTH_REQUIRED.
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*
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* KM_TAG_AUTH_TIMEOUT should generally be specified unless KM_TAG_NO_AUTH_REQUIRED is present,
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* or the user will have to authenticate for every use.
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*
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* KM_TAG_BLOCK_MODE, KM_TAG_PADDING, KM_TAG_MAC_LENGTH and KM_TAG_DIGEST must be specified for
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* algorithms that require them.
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*
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* The following tags may not be specified; their values will be provided by the implementation.
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*
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* - KM_TAG_ORIGIN,
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* - KM_TAG_ROLLBACK_RESISTANT,
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* - KM_TAG_CREATION_DATETIME
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*
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* \param[in] dev The keymaster device structure.
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*
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* \param[in] params Array of key generation parameters.
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*
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* \param[in] params_count Length of \p params.
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*
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* \param[out] key_blob returns the generated key. \p key_blob must not be NULL. The caller
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* assumes ownership key_blob->key_material and must free() it.
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*
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* \param[out] characteristics returns the characteristics of the key that was, generated, if
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* non-NULL. If non-NULL, the caller assumes ownership and must deallocate with
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* keymaster_free_characteristics(). Note that KM_TAG_ROOT_OF_TRUST, KM_TAG_APPLICATION_ID and
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* KM_TAG_APPLICATION_DATA are never returned.
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*/
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keymaster_error_t (*generate_key)(const struct keymaster1_device* dev,
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const keymaster_key_param_set_t* params,
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keymaster_key_blob_t* key_blob,
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keymaster_key_characteristics_t** characteristics);
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/**
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* Returns the characteristics of the specified key, or KM_ERROR_INVALID_KEY_BLOB if the
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* key_blob is invalid (implementations must fully validate the integrity of the key).
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* client_id and app_data must be the ID and data provided when the key was generated or
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* imported, or empty if KM_TAG_APPLICATION_ID and/or KM_TAG_APPLICATION_DATA were not provided
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* during generation. Those values are not included in the returned characteristics. The
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* caller assumes ownership of the allocated characteristics object, which must be deallocated
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* with keymaster_free_characteristics().
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*
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* Note that KM_TAG_ROOT_OF_TRUST, KM_TAG_APPLICATION_ID and KM_TAG_APPLICATION_DATA are never
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* returned.
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*
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* \param[in] dev The keymaster device structure.
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*
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* \param[in] key_blob The key to retreive characteristics from.
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*
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* \param[in] client_id The client ID data, or NULL if none associated.
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*
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* \param[in] app_id The app data, or NULL if none associated.
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*
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* \param[out] characteristics The key characteristics.
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*/
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keymaster_error_t (*get_key_characteristics)(const struct keymaster1_device* dev,
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const keymaster_key_blob_t* key_blob,
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const keymaster_blob_t* client_id,
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const keymaster_blob_t* app_data,
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keymaster_key_characteristics_t** characteristics);
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/**
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* Imports a key, or key pair, returning a key blob and/or a description of the key.
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*
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* Most key import parameters are defined as keymaster tag/value pairs, provided in "params".
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* See keymaster_tag_t for the full list. Values that are always required for import of useful
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* keys are:
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*
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* - KM_TAG_ALGORITHM;
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* - KM_TAG_PURPOSE; and
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* - (KM_TAG_USER_SECURE_ID and KM_TAG_USER_AUTH_TYPE) or KM_TAG_NO_AUTH_REQUIRED.
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*
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* KM_TAG_AUTH_TIMEOUT should generally be specified. If unspecified, the user will have to
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* authenticate for every use.
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*
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* The following tags will take default values if unspecified:
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*
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* - KM_TAG_KEY_SIZE will default to the size of the key provided.
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* - KM_TAG_RSA_PUBLIC_EXPONENT will default to the value in the key provided (for RSA keys)
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*
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* The following tags may not be specified; their values will be provided by the implementation.
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*
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* - KM_TAG_ORIGIN,
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* - KM_TAG_ROLLBACK_RESISTANT,
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* - KM_TAG_CREATION_DATETIME
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*
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* \param[in] dev The keymaster device structure.
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*
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* \param[in] params Parameters defining the imported key.
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*
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* \param[in] params_count The number of entries in \p params.
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*
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* \param[in] key_format specifies the format of the key data in key_data.
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*
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* \param[out] key_blob Used to return the opaque key blob. Must be non-NULL. The caller
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* assumes ownership of the contained key_material.
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*
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* \param[out] characteristics Used to return the characteristics of the imported key. May be
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* NULL, in which case no characteristics will be returned. If non-NULL, the caller assumes
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* ownership and must deallocate with keymaster_free_characteristics(). Note that
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* KM_TAG_ROOT_OF_TRUST, KM_TAG_APPLICATION_ID and
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* KM_TAG_APPLICATION_DATA are never returned.
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*/
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keymaster_error_t (*import_key)(const struct keymaster1_device* dev,
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const keymaster_key_param_set_t* params,
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keymaster_key_format_t key_format,
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const keymaster_blob_t* key_data,
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keymaster_key_blob_t* key_blob,
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keymaster_key_characteristics_t** characteristics);
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/**
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* Exports a public key, returning a byte array in the specified format.
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*
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* \param[in] dev The keymaster device structure.
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*
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* \param[in] export_format The format to be used for exporting the key.
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*
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* \param[in] key_to_export The key to export.
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*
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* \param[out] export_data The exported key material. The caller assumes ownership.
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*
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* \param[out] export_data_length The length of \p export_data.
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*/
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keymaster_error_t (*export_key)(const struct keymaster1_device* dev,
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keymaster_key_format_t export_format,
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const keymaster_key_blob_t* key_to_export,
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const keymaster_blob_t* client_id,
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const keymaster_blob_t* app_data,
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keymaster_blob_t* export_data);
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/**
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* Deletes the key, or key pair, associated with the key blob. After calling this function it
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* will be impossible to use the key for any other operations. May be applied to keys from
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* foreign roots of trust (keys not usable under the current root of trust).
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*
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* This function is optional and should be set to NULL if it is not implemented.
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*
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* \param[in] dev The keymaster device structure.
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*
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* \param[in] key The key to be deleted.
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*/
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keymaster_error_t (*delete_key)(const struct keymaster1_device* dev,
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const keymaster_key_blob_t* key);
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/**
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* Deletes all keys in the hardware keystore. Used when keystore is reset completely. After
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* calling this function it will be impossible to use any previously generated or imported key
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* blobs for any operations.
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*
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* This function is optional and should be set to NULL if it is not implemented.
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*
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* \param[in] dev The keymaster device structure.
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*/
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keymaster_error_t (*delete_all_keys)(const struct keymaster1_device* dev);
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/**
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* Begins a cryptographic operation using the specified key. If all is well, begin() will
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* return KM_ERROR_OK and create an operation handle which must be passed to subsequent calls to
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* update(), finish() or abort().
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*
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* It is critical that each call to begin() be paired with a subsequent call to finish() or
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* abort(), to allow the keymaster implementation to clean up any internal operation state.
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* Failure to do this may leak internal state space or other internal resources and may
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* eventually cause begin() to return KM_ERROR_TOO_MANY_OPERATIONS when it runs out of space for
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* operations. Any result other than KM_ERROR_OK from begin(), update() or finish() implicitly
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* aborts the operation, in which case abort() need not be called (and will return
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* KM_ERROR_INVALID_OPERATION_HANDLE if called).
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*
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* \param[in] dev The keymaster device structure.
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*
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* \param[in] purpose The purpose of the operation, one of KM_PURPOSE_ENCRYPT,
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* KM_PURPOSE_DECRYPT, KM_PURPOSE_SIGN or KM_PURPOSE_VERIFY. Note that for AEAD modes,
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* encryption and decryption imply signing and verification, respectively, but should be
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* specified as KM_PURPOSE_ENCRYPT and KM_PURPOSE_DECRYPT.
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*
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* \param[in] key The key to be used for the operation. \p key must have a purpose compatible
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* with \p purpose and all of its usage requirements must be satisfied, or begin() will return
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* an appropriate error code.
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*
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* \param[in] in_params Additional parameters for the operation. This is typically used to
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* provide authentication data, with KM_TAG_AUTH_TOKEN. If KM_TAG_APPLICATION_ID or
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* KM_TAG_APPLICATION_DATA were provided during generation, they must be provided here, or the
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* operation will fail with KM_ERROR_INVALID_KEY_BLOB. For operations that require a nonce or
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* IV, on keys that were generated with KM_TAG_CALLER_NONCE, in_params may contain a tag
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* KM_TAG_NONCE. For AEAD operations KM_TAG_CHUNK_SIZE is specified here.
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*
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* \param[out] out_params Output parameters. Used to return additional data from the operation
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* initialization, notably to return the IV or nonce from operations that generate an IV or
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* nonce. The caller takes ownership of the output parameters array and must free it with
|
|
* keymaster_free_param_set(). out_params may be set to NULL if no output parameters are
|
|
* expected. If out_params is NULL, and output paramaters are generated, begin() will return
|
|
* KM_ERROR_OUTPUT_PARAMETER_NULL.
|
|
*
|
|
* \param[out] operation_handle The newly-created operation handle which must be passed to
|
|
* update(), finish() or abort(). If operation_handle is NULL, begin() will return
|
|
* KM_ERROR_OUTPUT_PARAMETER_NULL.
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|
*/
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|
keymaster_error_t (*begin)(const struct keymaster1_device* dev, keymaster_purpose_t purpose,
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|
const keymaster_key_blob_t* key,
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|
const keymaster_key_param_set_t* in_params,
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|
keymaster_key_param_set_t* out_params,
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|
keymaster_operation_handle_t* operation_handle);
|
|
|
|
/**
|
|
* Provides data to, and possibly receives output from, an ongoing cryptographic operation begun
|
|
* with begin().
|
|
*
|
|
* If operation_handle is invalid, update() will return KM_ERROR_INVALID_OPERATION_HANDLE.
|
|
*
|
|
* update() may not consume all of the data provided in the data buffer. update() will return
|
|
* the amount consumed in *data_consumed. The caller should provide the unconsumed data in a
|
|
* subsequent call.
|
|
*
|
|
* \param[in] dev The keymaster device structure.
|
|
*
|
|
* \param[in] operation_handle The operation handle returned by begin().
|
|
*
|
|
* \param[in] in_params Additional parameters for the operation. For AEAD modes, this is used
|
|
* to specify KM_TAG_ADDITIONAL_DATA. Note that additional data may be provided in multiple
|
|
* calls to update(), but only until input data has been provided.
|
|
*
|
|
* \param[in] input Data to be processed, per the parameters established in the call to begin().
|
|
* Note that update() may or may not consume all of the data provided. See \p input_consumed.
|
|
*
|
|
* \param[out] input_consumed Amount of data that was consumed by update(). If this is less
|
|
* than the amount provided, the caller should provide the remainder in a subsequent call to
|
|
* update().
|
|
*
|
|
* \param[out] out_params Output parameters. Used to return additional data from the operation
|
|
* The caller takes ownership of the output parameters array and must free it with
|
|
* keymaster_free_param_set(). out_params may be set to NULL if no output parameters are
|
|
* expected. If out_params is NULL, and output paramaters are generated, begin() will return
|
|
* KM_ERROR_OUTPUT_PARAMETER_NULL.
|
|
*
|
|
* \param[out] output The output data, if any. The caller assumes ownership of the allocated
|
|
* buffer. output must not be NULL.
|
|
*
|
|
* Note that update() may not provide any output, in which case output->data_length will be
|
|
* zero, and output->data may be either NULL or zero-length (so the caller should always free()
|
|
* it).
|
|
*/
|
|
keymaster_error_t (*update)(const struct keymaster1_device* dev,
|
|
keymaster_operation_handle_t operation_handle,
|
|
const keymaster_key_param_set_t* in_params,
|
|
const keymaster_blob_t* input, size_t* input_consumed,
|
|
keymaster_key_param_set_t* out_params, keymaster_blob_t* output);
|
|
|
|
/**
|
|
* Finalizes a cryptographic operation begun with begin() and invalidates \p operation_handle.
|
|
*
|
|
* \param[in] dev The keymaster device structure.
|
|
*
|
|
* \param[in] operation_handle The operation handle returned by begin(). This handle will be
|
|
* invalidated.
|
|
*
|
|
* \param[in] params Additional parameters for the operation. For AEAD modes, this is used to
|
|
* specify KM_TAG_ADDITIONAL_DATA, but only if no input data was provided to update().
|
|
*
|
|
* \param[in] signature The signature to be verified if the purpose specified in the begin()
|
|
* call was KM_PURPOSE_VERIFY.
|
|
*
|
|
* \param[out] output The output data, if any. The caller assumes ownership of the allocated
|
|
* buffer.
|
|
*
|
|
* If the operation being finished is a signature verification or an AEAD-mode decryption and
|
|
* verification fails then finish() will return KM_ERROR_VERIFICATION_FAILED.
|
|
*/
|
|
keymaster_error_t (*finish)(const struct keymaster1_device* dev,
|
|
keymaster_operation_handle_t operation_handle,
|
|
const keymaster_key_param_set_t* in_params,
|
|
const keymaster_blob_t* signature,
|
|
keymaster_key_param_set_t* out_params, keymaster_blob_t* output);
|
|
|
|
/**
|
|
* Aborts a cryptographic operation begun with begin(), freeing all internal resources and
|
|
* invalidating \p operation_handle.
|
|
*/
|
|
keymaster_error_t (*abort)(const struct keymaster1_device* dev,
|
|
keymaster_operation_handle_t operation_handle);
|
|
};
|
|
typedef struct keymaster1_device keymaster1_device_t;
|
|
|
|
/* Convenience API for opening and closing keymaster devices */
|
|
|
|
static inline int keymaster1_open(const struct hw_module_t* module, keymaster1_device_t** device) {
|
|
return module->methods->open(module, KEYSTORE_KEYMASTER, (struct hw_device_t**)device);
|
|
}
|
|
|
|
static inline int keymaster1_close(keymaster1_device_t* device) {
|
|
return device->common.close(&device->common);
|
|
}
|
|
|
|
__END_DECLS
|
|
|
|
#endif // ANDROID_HARDWARE_KEYMASTER1_H
|