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author | Jim Blackler <jimblackler@google.com> | 2021-10-11 14:04:30 +0000 |
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committer | Gerrit Code Review <noreply-gerritcodereview@google.com> | 2021-10-11 14:04:30 +0000 |
commit | aed1b5671f6b7ebd2ff02f3bd2840acad9f8fa19 (patch) | |
tree | a4fae5bd553b2fa61530cf87a79d59e969189222 | |
parent | 833a929d857560655ca45f946e249902ca2853f1 (diff) | |
parent | 6b834a3b75f9653bea921a17510faee52c3070dc (diff) | |
download | libhardware-android-s-v2-preview-1.tar.gz |
Merge "Revert "Delete KM1""android-s-v2-preview-2android-s-v2-preview-1android-s-v2-beta-2android-s-v2-preview-1
-rw-r--r-- | include/hardware/keymaster1.h | 548 |
1 files changed, 548 insertions, 0 deletions
diff --git a/include/hardware/keymaster1.h b/include/hardware/keymaster1.h new file mode 100644 index 00000000..99693806 --- /dev/null +++ b/include/hardware/keymaster1.h @@ -0,0 +1,548 @@ +/* + * 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; and + * - (KM_TAG_USER_SECURE_ID and KM_TAG_USER_AUTH_TYPE) or KM_TAG_NO_AUTH_REQUIRED. + * + * 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 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. \p key_blob must not be NULL. The caller + * assumes ownership key_blob->key_material and must free() it. + * + * \param[out] characteristics returns the characteristics of the key that was, generated, if + * non-NULL. If non-NULL, the caller assumes ownership and must deallocate 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_set_t* params, + keymaster_key_blob_t* key_blob, + keymaster_key_characteristics_t** characteristics); + + /** + * Returns the characteristics of the specified key, or KM_ERROR_INVALID_KEY_BLOB 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, or empty if KM_TAG_APPLICATION_ID and/or KM_TAG_APPLICATION_DATA were not provided + * during generation. Those values are not included in the returned characteristics. The + * 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. Values that are always required for import of useful + * keys are: + * + * - KM_TAG_ALGORITHM; + * - KM_TAG_PURPOSE; and + * - (KM_TAG_USER_SECURE_ID and KM_TAG_USER_AUTH_TYPE) or KM_TAG_NO_AUTH_REQUIRED. + * + * KM_TAG_AUTH_TIMEOUT should generally be specified. If unspecified, the user will have to + * authenticate for every use. + * + * The following tags will take default values if unspecified: + * + * - KM_TAG_KEY_SIZE will default to the size of the key provided. + * - KM_TAG_RSA_PUBLIC_EXPONENT will default to the value in the key provided (for RSA keys) + * + * 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(). Note that + * KM_TAG_ROOT_OF_TRUST, KM_TAG_APPLICATION_ID and + * KM_TAG_APPLICATION_DATA are never returned. + */ + keymaster_error_t (*import_key)(const struct keymaster1_device* dev, + const keymaster_key_param_set_t* params, + keymaster_key_format_t key_format, + const keymaster_blob_t* key_data, + 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, + keymaster_blob_t* export_data); + + /** + * 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 may leak internal state space or other internal resources and may + * eventually cause begin() to return KM_ERROR_TOO_MANY_OPERATIONS when it runs out of space for + * operations. Any result other than KM_ERROR_OK from begin(), update() or finish() implicitly + * aborts the operation, in which case abort() need not be called (and will return + * KM_ERROR_INVALID_OPERATION_HANDLE if called). + * + * \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, but should be + * specified as KM_PURPOSE_ENCRYPT and KM_PURPOSE_DECRYPT. + * + * \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] in_params Additional parameters for the operation. This is typically used to + * provide authentication data, with KM_TAG_AUTH_TOKEN. If KM_TAG_APPLICATION_ID or + * KM_TAG_APPLICATION_DATA were provided during generation, they must be provided here, or the + * operation will fail with KM_ERROR_INVALID_KEY_BLOB. For operations that require a nonce or + * IV, on keys that were generated with KM_TAG_CALLER_NONCE, in_params may contain a tag + * KM_TAG_NONCE. For AEAD operations KM_TAG_CHUNK_SIZE is specified here. + * + * \param[out] out_params Output parameters. Used to return additional data from the operation + * initialization, notably to return the IV or nonce from operations that generate an IV or + * 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. + */ + keymaster_error_t (*begin)(const struct keymaster1_device* dev, keymaster_purpose_t purpose, + const keymaster_key_blob_t* key, + const keymaster_key_param_set_t* in_params, + keymaster_key_param_set_t* out_params, + 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, TO_HW_DEVICE_T_OPEN(device)); +} + +static inline int keymaster1_close(keymaster1_device_t* device) { + return device->common.close(&device->common); +} + +__END_DECLS + +#endif // ANDROID_HARDWARE_KEYMASTER1_H |