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author | Shawn Willden <swillden@google.com> | 2015-02-24 09:17:38 -0700 |
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committer | Shawn Willden <swillden@google.com> | 2015-02-24 14:58:17 -0700 |
commit | fd4b4d5a9b692bbeedc310f3bc970d849035f43d (patch) | |
tree | 530dd67d210c6cf78c78d61af33b6470831c3c78 /include/hardware/keymaster1.h | |
parent | 4f5949b5dda4a2e95d29e1aa3effb22c678df21a (diff) | |
download | hardware_libhardware-fd4b4d5a9b692bbeedc310f3bc970d849035f43d.zip hardware_libhardware-fd4b4d5a9b692bbeedc310f3bc970d849035f43d.tar.gz hardware_libhardware-fd4b4d5a9b692bbeedc310f3bc970d849035f43d.tar.bz2 |
Separate keymaster0 and keymaster1 HALs.
For now the keymaster1 HAL still includes all of the keymaster0 entry
points, and soft_keymaster_device will continue to implement them. In
the near future the keymaster0 entry points will be removed, as soon as
we can ensure that keystore no longer needs them.
Change-Id: I5c54282c12d1c4b8b22ed4929b6e6c724a94ede4
Diffstat (limited to 'include/hardware/keymaster1.h')
-rw-r--r-- | include/hardware/keymaster1.h | 617 |
1 files changed, 617 insertions, 0 deletions
diff --git a/include/hardware/keymaster1.h b/include/hardware/keymaster1.h new file mode 100644 index 0000000..dae3b8e --- /dev/null +++ b/include/hardware/keymaster1.h @@ -0,0 +1,617 @@ +/* + * 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); + + /** + * Change a key's authorizations. + * + * Update the authorizations associated with key_blob to the list specified in new_params, which + * must contain the complete set of authorizations desired (hw_enforced and sw_enforced). Tags + * will be added, removed and/or updated only if the appropriate KM_TAG_RESCOPING_ADD and + * KM_TAG_RESCOPING_DEL tags exist in the key's authorizations, otherwise + * KM_ERROR_INVALID_RESCOPING will be returned and no changes will be made. + * + * \param[in] dev The keymaster device structure. + * + * \param[in] new_params The new authorization list to be associated with the key. + * + * \param[in] new_params_count The number of entries in \p new_params. + * + * \param[in] key_blob The key to update. + * + * \param[in] client_id The client ID associated with the key, or NULL if none is associated. + * + * \param[in] app_data The application data associated with the key, or NULL if none is + * associated. + * + * \param[out] rescoped_key_blob The key blob with the updated authorizations, if successful. + * The caller assumes ownership of rescoped_key_blob->key_material and must free() it. + * + * \param[out] characteristics If not null will contain the new key authorizations, divided into + * hw_enforced and sw_enforced lists. The caller takes ownership and must call + * keymaster_free_characteristics() to free. + */ + keymaster_error_t (*rescope)(const struct keymaster1_device* dev, + const keymaster_key_param_t* new_params, size_t new_params_count, + const keymaster_key_blob_t* key_blob, + const keymaster_blob_t* client_id, + const keymaster_blob_t* app_data, + keymaster_key_blob_t* rescoped_key_blob, + 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 (though rescoped versions may + * exist, and if so will be usable). 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. + * + * Returns 0 on success or an error code less than 0. + */ + int (*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 |