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platform_hardware_libhardware/include/hardware/keymaster1.h
Shawn Willden 9b31a49c36 Remove rescoping. 
Rescoping was never a very good solution to the problem of supporting
multiple sets of authorizations for a given key material.  For M we're
removing it and in the future a better solution will be provided.

Change-Id: I6f7585274487bd66e4d90e89014af41e9aa30411
(cherry picked from commit 7f10ab99fc)
2015-05-12 11:29:27 +00:00

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