diff --git a/include/hardware/keymaster.h b/include/hardware/keymaster.h
index 8c5ff14..a6200a5 100644
--- a/include/hardware/keymaster.h
+++ b/include/hardware/keymaster.h
@@ -22,6 +22,7 @@
 #include <sys/types.h>
 
 #include <hardware/hardware.h>
+#include <hardware/keymaster_defs.h>
 
 __BEGIN_DECLS
 
@@ -36,51 +37,19 @@
  * Settings for "module_api_version" and "hal_api_version"
  * fields in the keymaster_module initialization.
  */
-#define KEYMASTER_HEADER_VERSION 3
+#define KEYMASTER_HEADER_VERSION 4
 
-#define KEYMASTER_MODULE_API_VERSION_0_2  HARDWARE_MODULE_API_VERSION(0, 2)
-#define KEYMASTER_DEVICE_API_VERSION_0_2  HARDWARE_DEVICE_API_VERSION_2(0, 2, KEYMASTER_HEADER_VERSION)
+#define KEYMASTER_MODULE_API_VERSION_0_2 HARDWARE_MODULE_API_VERSION(0, 2)
+#define KEYMASTER_DEVICE_API_VERSION_0_2 \
+    HARDWARE_DEVICE_API_VERSION_2(0, 2, KEYMASTER_HEADER_VERSION)
 
-#define KEYMASTER_MODULE_API_VERSION_0_3  HARDWARE_MODULE_API_VERSION(0, 3)
-#define KEYMASTER_DEVICE_API_VERSION_0_3  HARDWARE_DEVICE_API_VERSION_2(0, 3, KEYMASTER_HEADER_VERSION)
+#define KEYMASTER_MODULE_API_VERSION_0_3 HARDWARE_MODULE_API_VERSION(0, 3)
+#define KEYMASTER_DEVICE_API_VERSION_0_3 \
+    HARDWARE_DEVICE_API_VERSION_2(0, 3, KEYMASTER_HEADER_VERSION)
 
-/**
- * Flags for keymaster_device::flags
- */
-enum {
-    /*
-     * Indicates this keymaster implementation does not have hardware that
-     * keeps private keys out of user space.
-     *
-     * This should not be implemented on anything other than the default
-     * implementation.
-     */
-    KEYMASTER_SOFTWARE_ONLY = 1 << 0,
-
-    /*
-     * This indicates that the key blobs returned via all the primitives
-     * are sufficient to operate on their own without the trusted OS
-     * querying userspace to retrieve some other data. Key blobs of
-     * this type are normally returned encrypted with a
-     * Key Encryption Key (KEK).
-     *
-     * This is currently used by "vold" to know whether the whole disk
-     * encryption secret can be unwrapped without having some external
-     * service started up beforehand since the "/data" partition will
-     * be unavailable at that point.
-     */
-    KEYMASTER_BLOBS_ARE_STANDALONE = 1 << 1,
-
-    /*
-     * Indicates that the keymaster module supports DSA keys.
-     */
-    KEYMASTER_SUPPORTS_DSA = 1 << 2,
-
-    /*
-     * Indicates that the keymaster module supports EC keys.
-     */
-    KEYMASTER_SUPPORTS_EC = 1 << 3,
-};
+#define KEYMASTER_MODULE_API_VERSION_0_4 HARDWARE_MODULE_API_VERSION(0, 4)
+#define KEYMASTER_DEVICE_API_VERSION_0_4 \
+    HARDWARE_DEVICE_API_VERSION_2(0, 4, KEYMASTER_HEADER_VERSION)
 
 struct keystore_module {
     /**
@@ -93,82 +62,6 @@
 };
 
 /**
- * Asymmetric key pair types.
- */
-typedef enum {
-    TYPE_RSA = 1,
-    TYPE_DSA = 2,
-    TYPE_EC = 3,
-} keymaster_keypair_t;
-
-/**
- * Parameters needed to generate an RSA key.
- */
-typedef struct {
-    uint32_t modulus_size;
-    uint64_t public_exponent;
-} keymaster_rsa_keygen_params_t;
-
-/**
- * Parameters needed to generate a DSA key.
- */
-typedef struct {
-    uint32_t key_size;
-    uint32_t generator_len;
-    uint32_t prime_p_len;
-    uint32_t prime_q_len;
-    const uint8_t* generator;
-    const uint8_t* prime_p;
-    const uint8_t* prime_q;
-} keymaster_dsa_keygen_params_t;
-
-/**
- * Parameters needed to generate an EC key.
- *
- * Field size is the only parameter in version 2. The sizes correspond to these required curves:
- *
- * 192 = NIST P-192
- * 224 = NIST P-224
- * 256 = NIST P-256
- * 384 = NIST P-384
- * 521 = NIST P-521
- *
- * The parameters for these curves are available at: http://www.nsa.gov/ia/_files/nist-routines.pdf
- * in Chapter 4.
- */
-typedef struct {
-    uint32_t field_size;
-} keymaster_ec_keygen_params_t;
-
-/**
- * Digest type.
- */
-typedef enum {
-    DIGEST_NONE,
-} keymaster_digest_t;
-
-/**
- * Type of padding used for RSA operations.
- */
-typedef enum {
-    PADDING_NONE,
-} keymaster_rsa_padding_t;
-
-
-typedef struct {
-    keymaster_digest_t digest_type;
-} keymaster_dsa_sign_params_t;
-
-typedef struct {
-    keymaster_digest_t digest_type;
-} keymaster_ec_sign_params_t;
-
-typedef struct {
-    keymaster_digest_t digest_type;
-    keymaster_rsa_padding_t padding_type;
-} keymaster_rsa_sign_params_t;
-
-/**
  * The parameters that can be set for a given keymaster implementation.
  */
 struct keymaster_device {
@@ -194,52 +87,49 @@
     void* context;
 
     /**
-     * Generates a public and private key. The key-blob returned is opaque
-     * and must subsequently provided for signing and verification.
+     * \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 keymaster_device* dev,
-            const keymaster_keypair_t key_type, const void* key_params,
-            uint8_t** key_blob, size_t* key_blob_length);
+    int (*generate_keypair)(const struct keymaster_device* dev, const keymaster_keypair_t key_type,
+                            const void* key_params, uint8_t** key_blob, size_t* key_blob_length);
 
     /**
-     * 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.
+     * \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 keymaster_device* dev,
-            const uint8_t* key, const size_t key_length,
-            uint8_t** key_blob, size_t* key_blob_length);
+    int (*import_keypair)(const struct keymaster_device* dev, const uint8_t* key,
+                          const size_t key_length, uint8_t** key_blob, size_t* key_blob_length);
 
     /**
-     * Gets the public key part of a key pair. The public key must be in
-     * X.509 format (Java standard) encoded byte array.
+     * \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.
+     * 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 keymaster_device* dev,
-            const uint8_t* key_blob, const size_t key_blob_length,
-            uint8_t** x509_data, size_t* x509_data_length);
+    int (*get_keypair_public)(const struct keymaster_device* dev, const uint8_t* key_blob,
+                              const size_t key_blob_length, uint8_t** x509_data,
+                              size_t* x509_data_length);
 
     /**
-     * Deletes the key pair associated with the key blob.
+     * \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 keymaster_device* dev,
-            const uint8_t* key_blob, const size_t key_blob_length);
+    int (*delete_keypair)(const struct keymaster_device* dev, const uint8_t* key_blob,
+                          const size_t key_blob_length);
 
     /**
-     * Deletes all keys in the hardware keystore. Used when keystore is
-     * reset completely.
+     * \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.
@@ -249,45 +139,515 @@
     int (*delete_all)(const struct keymaster_device* dev);
 
     /**
-     * Signs data using a key-blob generated before. This can use either
-     * an asymmetric key or a secret key.
+     * \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 keymaster_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);
+    int (*sign_data)(const struct keymaster_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);
 
     /**
-     * Verifies data signed with a key-blob. This can use either
-     * an asymmetric key or a secret key.
+     * \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 keymaster_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);
+    int (*verify_data)(const struct keymaster_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 keymaster_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 keymaster_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 keymaster_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 keymaster_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 keymaster_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 keymaster_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 keymaster_device* dev, 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 keymaster_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 keymaster_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 keymaster_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,
+                                 const 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 keymaster_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 keymaster_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 keymaster_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 keymaster_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.  Less commonly, \params can be used to provide AEAD additional
+     * data and chunk size with KM_TAG_ADDITIONAL_DATA or KM_TAG_CHUNK_SIZE respectively.
+     *
+     * \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 keymaster_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);
+
+    /**
+     * Get an estimate of the output that will be generated by calling update() with the specified
+     * number of input bytes, followed by finish().  The estimate may not be exact, but is
+     * guaranteed not to be smaller than sum of the output lengths from update() and finish().  The
+     * estimate takes into account input data already provided.
+     *
+     * \param[in] input_length The number of additional input bytes to be processed.
+     *
+     * \param[out] output_estimate The length of the output that will be produced.
+     */
+    keymaster_error_t (*get_output_size)(size_t input_length, size_t* output_estimate);
+
+    /**
+     * 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] 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 keymaster_device* dev,
+                                keymaster_operation_handle_t operation_handle, 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] 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 keymaster_device* dev,
+                                keymaster_operation_handle_t operation_handle,
+                                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 keymaster_device* dev,
+                               keymaster_operation_handle_t operation_handle);
 };
 typedef struct keymaster_device keymaster_device_t;
 
-
 /* Convenience API for opening and closing keymaster devices */
 
-static inline int keymaster_open(const struct hw_module_t* module,
-        keymaster_device_t** device)
-{
-    int rc = module->methods->open(module, KEYSTORE_KEYMASTER,
-            (struct hw_device_t**) device);
-
-    return rc;
+static inline int keymaster_open(const struct hw_module_t* module, keymaster_device_t** device) {
+    return module->methods->open(module, KEYSTORE_KEYMASTER, (struct hw_device_t**)device);
 }
 
-static inline int keymaster_close(keymaster_device_t* device)
-{
+static inline int keymaster_close(keymaster_device_t* device) {
     return device->common.close(&device->common);
 }
 
diff --git a/include/hardware/keymaster_defs.h b/include/hardware/keymaster_defs.h
new file mode 100644
index 0000000..3a0aecc
--- /dev/null
+++ b/include/hardware/keymaster_defs.h
@@ -0,0 +1,614 @@
+/*
+ * Copyright (C) 2014 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_KEYMASTER_DEFS_H
+#define ANDROID_HARDWARE_KEYMASTER_DEFS_H
+
+#include <stdint.h>
+#include <stdlib.h>
+#include <string.h>
+
+#if defined(__cplusplus)
+extern "C" {
+#endif  // defined(__cplusplus)
+
+/*!
+ * \deprecated Flags for keymaster_device::flags
+ *
+ * keymaster_device::flags is deprecated and will be removed in the
+ * next version of the API in favor of the more detailed information
+ * available from TODO:
+ */
+enum {
+    /*
+     * Indicates this keymaster implementation does not have hardware that
+     * keeps private keys out of user space.
+     *
+     * This should not be implemented on anything other than the default
+     * implementation.
+     */
+    KEYMASTER_SOFTWARE_ONLY = 1 << 0,
+
+    /*
+     * This indicates that the key blobs returned via all the primitives
+     * are sufficient to operate on their own without the trusted OS
+     * querying userspace to retrieve some other data. Key blobs of
+     * this type are normally returned encrypted with a
+     * Key Encryption Key (KEK).
+     *
+     * This is currently used by "vold" to know whether the whole disk
+     * encryption secret can be unwrapped without having some external
+     * service started up beforehand since the "/data" partition will
+     * be unavailable at that point.
+     */
+    KEYMASTER_BLOBS_ARE_STANDALONE = 1 << 1,
+
+    /*
+     * Indicates that the keymaster module supports DSA keys.
+     */
+    KEYMASTER_SUPPORTS_DSA = 1 << 2,
+
+    /*
+     * Indicates that the keymaster module supports EC keys.
+     */
+    KEYMASTER_SUPPORTS_EC = 1 << 3,
+};
+
+/**
+ * \deprecated Asymmetric key pair types.
+ */
+typedef enum {
+    TYPE_RSA = 1,
+    TYPE_DSA = 2,
+    TYPE_EC = 3,
+} keymaster_keypair_t;
+
+/**
+ * Authorization tags each have an associated type.  This enumeration facilitates tagging each with
+ * a type, by using the high four bits (of an implied 32-bit unsigned enum value) to specify up to
+ * 16 data types.  These values are ORed with tag IDs to generate the final tag ID values.
+ */
+typedef enum {
+    KM_INVALID = 0 << 28, /* Invalid type, used to designate a tag as uninitialized */
+    KM_ENUM = 1 << 28,
+    KM_ENUM_REP = 2 << 28, /* Repeatable enumeration value. */
+    KM_INT = 3 << 28,
+    KM_INT_REP = 4 << 28, /* Repeatable integer value */
+    KM_LONG = 5 << 28,
+    KM_DATE = 6 << 28,
+    KM_BOOL = 7 << 28,
+    KM_BIGNUM = 8 << 28,
+    KM_BYTES = 9 << 28,
+} keymaster_tag_type_t;
+
+typedef enum {
+    KM_TAG_INVALID = KM_INVALID | 0,
+
+    /*
+     * Tags that must be semantically enforced by hardware and software implementations.
+     */
+
+    /* Crypto parameters */
+    KM_TAG_PURPOSE = KM_ENUM_REP | 1, /* keymaster_purpose_t. */
+    KM_TAG_ALGORITHM = KM_ENUM | 2,   /* keymaster_algorithm_t. */
+    KM_TAG_KEY_SIZE = KM_INT | 3,     /* Key size in bits. */
+    KM_TAG_BLOCK_MODE = KM_ENUM | 4,  /* keymaster_block_mode_t. */
+    KM_TAG_DIGEST = KM_ENUM | 5,      /* keymaster_digest_t. */
+    KM_TAG_MAC_LENGTH = KM_INT | 6,   /* MAC length in bits. */
+    KM_TAG_PADDING = KM_ENUM | 7,     /* keymaster_padding_t. */
+    KM_TAG_CHUNK_LENGTH = KM_INT | 8, /* AEAD mode minimum decryption chunk size, in bytes. */
+    KM_TAG_NONCE = KM_BYTES | 9,      /* Nonce or Initialization Vector */
+
+    /* Other hardware-enforced. */
+    KM_TAG_RESCOPING_ADD = KM_ENUM_REP | 101, /* Tags authorized for addition via rescoping. */
+    KM_TAG_RESCOPING_DEL = KM_ENUM_REP | 102, /* Tags authorized for removal via rescoping. */
+    KM_TAG_BLOB_USAGE_REQUIREMENTS = KM_ENUM | 705, /* keymaster_key_blob_usage_requirements_t */
+
+    /* Algorithm-specific. */
+    KM_TAG_RSA_PUBLIC_EXPONENT = KM_LONG | 200, /* Defaults to 2^16+1 */
+    KM_TAG_DSA_GENERATOR = KM_BIGNUM | 201,
+    KM_TAG_DSA_P = KM_BIGNUM | 202,
+    KM_TAG_DSA_Q = KM_BIGNUM | 203,
+    /* Note there are no EC-specific params.  Field size is defined by KM_TAG_KEY_SIZE, and the
+       curve is chosen from NIST recommendations for field size */
+
+    /*
+     * Tags that should be semantically enforced by hardware if possible and will otherwise be
+     * enforced by software (keystore).
+     */
+
+    /* Key validity period */
+    KM_TAG_ACTIVE_DATETIME = KM_DATE | 400,             /* Start of validity */
+    KM_TAG_ORIGINATION_EXPIRE_DATETIME = KM_DATE | 401, /* Date when new "messages" should no
+                                                           longer be created. */
+    KM_TAG_USAGE_EXPIRE_DATETIME = KM_DATE | 402,       /* Date when existing "messages" should no
+                                                           longer be trusted. */
+    KM_TAG_MIN_SECONDS_BETWEEN_OPS = KM_INT | 403,      /* Minimum elapsed time between
+                                                           cryptographic operations with the key. */
+    KM_TAG_SINGLE_USE_PER_BOOT = KM_BOOL | 404,         /* If true, the key can only be used once
+                                                           per boot. */
+
+    /* User authentication */
+    KM_TAG_ALL_USERS = KM_BOOL | 500, /* If key is usable by all users. */
+    KM_TAG_USER_ID = KM_INT | 501,    /* ID of authorized user.  Disallowed if KM_TAG_ALL_USERS is
+                                         present. */
+    KM_TAG_NO_AUTH_REQUIRED = KM_BOOL | 502,    /* If key is usable without authentication. */
+    KM_TAG_USER_AUTH_ID = KM_INT_REP | 503,     /* ID of the authenticator to use (e.g. password,
+                                                   fingerprint, etc.).  Repeatable to support
+                                                   multi-factor auth.  Disallowed if
+                                                   KM_TAG_NO_AUTH_REQUIRED is present. */
+    KM_TAG_AUTH_TIMEOUT = KM_INT | 504,         /* Required freshness of user authentication for
+                                                   private/secret key operations, in seconds.
+                                                   Public key operations require no authentication.
+                                                   If absent, authentication is required for every
+                                                   use.  Authentication state is lost when the
+                                                   device is powered off. */
+    KM_TAG_RESCOPE_AUTH_TIMEOUT = KM_INT | 505, /* Required freshness of user authentication for key
+                                                   rescoping operations, in seconds.  Public key
+                                                   operations require no authentication.  If absent,
+                                                   authentication required for every rescoping. */
+
+    /* Application access control */
+    KM_TAG_ALL_APPLICATIONS = KM_BOOL | 600, /* If key is usable by all applications. */
+    KM_TAG_APPLICATION_ID = KM_BYTES | 601,  /* ID of authorized application. Disallowed if
+                                                KM_TAG_ALL_APPLICATIONS is present. */
+
+    /*
+     * Semantically unenforceable tags, either because they have no specific meaning or because
+     * they're informational only.
+     */
+    KM_TAG_APPLICATION_DATA = KM_BYTES | 700,  /* Data provided by authorized application. */
+    KM_TAG_CREATION_DATETIME = KM_DATE | 701,  /* Key creation time */
+    KM_TAG_ORIGIN = KM_ENUM | 702,             /* keymaster_key_origin_t. */
+    KM_TAG_ROLLBACK_RESISTANT = KM_BOOL | 703, /* Whether key is rollback-resistant. */
+    KM_TAG_ROOT_OF_TRUST = KM_BYTES | 704,     /* Root of trust ID.  Empty array means usable by all
+                                                  roots. */
+
+    /* Tags used only to provide data to operations */
+    KM_TAG_ADDITIONAL_DATA = KM_BYTES | 1000, /* Used to provide additional data for AEAD modes. */
+} keymaster_tag_t;
+
+/**
+ * Algorithms that may be provided by keymaster implementations.  Those that must be provided by all
+ * implementations are tagged as "required".  Note that where the values in this enumeration overlap
+ * with the values for the deprecated keymaster_keypair_t, the same algorithm must be
+ * specified. This type is new in 0_4 and replaces the deprecated keymaster_keypair_t.
+ */
+typedef enum {
+    /* Asymmetric algorithms. */
+    KM_ALGORITHM_RSA = 1,   /* required */
+    KM_ALGORITHM_DSA = 2,   /* required */
+    KM_ALGORITHM_ECDSA = 3, /* required */
+    KM_ALGORITHM_ECIES = 4,
+    /* FIPS Approved Ciphers */
+    KM_ALGORITHM_AES = 32, /* required */
+    KM_ALGORITHM_3DES = 33,
+    KM_ALGORITHM_SKIPJACK = 34,
+    /* AES Finalists */
+    KM_ALGORITHM_MARS = 48,
+    KM_ALGORITHM_RC6 = 49,
+    KM_ALGORITHM_SERPENT = 50,
+    KM_ALGORITHM_TWOFISH = 51,
+    /* Other common block ciphers */
+    KM_ALGORITHM_IDEA = 52,
+    KM_ALGORITHM_RC5 = 53,
+    KM_ALGORITHM_CAST5 = 54,
+    KM_ALGORITHM_BLOWFISH = 55,
+    /* Common stream ciphers */
+    KM_ALGORITHM_RC4 = 64,
+    KM_ALGORITHM_CHACHA20 = 65,
+    /* MAC algorithms */
+    KM_ALGORITHM_HMAC = 128, /* required */
+} keymaster_algorithm_t;
+
+/**
+ * Symmetric block cipher modes that may be provided by keymaster implementations.  Those that must
+ * be provided by all implementations are tagged as "required".  This type is new in 0_4.
+ *
+ * KM_MODE_FIRST_UNAUTHENTICATED, KM_MODE_FIRST_AUTHENTICATED and KM_MODE_FIRST_MAC are not modes,
+ * but markers used to separate the available modes into classes.
+ */
+typedef enum {
+    /* Unauthenticated modes, usable only for encryption/decryption and not generally recommended
+     * except for compatibility with existing other protocols. */
+    KM_MODE_FIRST_UNAUTHENTICATED = 1,
+    KM_MODE_ECB = KM_MODE_FIRST_UNAUTHENTICATED, /* required */
+    KM_MODE_CBC = 2,                             /* required */
+    KM_MODE_CBC_CTS = 3,                         /* recommended */
+    KM_MODE_CTR = 4,                             /* recommended */
+    KM_MODE_OFB = 5,
+    KM_MODE_CFB = 6,
+    KM_MODE_XTS = 7, /* Note: requires double-length keys */
+    /* Authenticated modes, usable for encryption/decryption and signing/verification.  Recommended
+     * over unauthenticated modes for all purposes.  One of KM_MODE_GCM and KM_MODE_OCB is
+     * required. */
+    KM_MODE_FIRST_AUTHENTICATED = 32,
+    KM_MODE_GCM = KM_MODE_FIRST_AUTHENTICATED,
+    KM_MODE_OCB = 33,
+    KM_MODE_CCM = 34,
+    /* MAC modes -- only for signing/verification */
+    KM_MODE_FIRST_MAC = 128,
+    KM_MODE_CMAC = KM_MODE_FIRST_MAC,
+    KM_MODE_POLY1305 = 129,
+} keymaster_block_mode_t;
+
+/**
+ * Padding modes that may be applied to plaintext for encryption operations.  This list includes
+ * padding modes for both symmetric and asymmetric algorithms.  Note that implementations should not
+ * provide all possible combinations of algorithm and padding, only the
+ * cryptographically-appropriate pairs.
+ */
+typedef enum {
+    KM_PAD_NONE = 1,     /* required, deprecated */
+    KM_PAD_RSA_OAEP = 2, /* required */
+    KM_PAD_RSA_PSS = 3,  /* required */
+    KM_PAD_RSA_PKCS1_1_5_ENCRYPT = 4,
+    KM_PAD_RSA_PKCS1_1_5_SIGN = 5,
+    KM_PAD_ANSI_X923 = 32,
+    KM_PAD_ISO_10126 = 33,
+    KM_PAD_ZERO = 64,  /* required */
+    KM_PAD_PKCS7 = 65, /* required */
+    KM_PAD_ISO_7816_4 = 66,
+} keymaster_padding_t;
+
+/**
+ * Digests that may be provided by keymaster implementations.  Those that must be provided by all
+ * implementations are tagged as "required".  Those that have been added since version 0_2 of the
+ * API are tagged as "new".
+ */
+typedef enum {
+    KM_DIGEST_NONE = 0,           /* new, required */
+    DIGEST_NONE = KM_DIGEST_NONE, /* For 0_2 compatibility */
+    KM_DIGEST_MD5 = 1,            /* new, for compatibility with old protocols only */
+    KM_DIGEST_SHA1 = 2,           /* new */
+    KM_DIGEST_SHA_2_224 = 3,      /* new */
+    KM_DIGEST_SHA_2_256 = 4,      /* new, required */
+    KM_DIGEST_SHA_2_384 = 5,      /* new, recommended */
+    KM_DIGEST_SHA_2_512 = 6,      /* new, recommended */
+    KM_DIGEST_SHA_3_256 = 7,      /* new */
+    KM_DIGEST_SHA_3_384 = 8,      /* new */
+    KM_DIGEST_SHA_3_512 = 9,      /* new */
+} keymaster_digest_t;
+
+/**
+ * The origin of a key (or pair), i.e. where it was generated.  Origin and can be used together to
+ * determine whether a key may have existed outside of secure hardware.  This type is new in 0_4.
+ */
+typedef enum {
+    KM_ORIGIN_HARDWARE = 0, /* Generated in secure hardware */
+    KM_ORIGIN_SOFTWARE = 1, /* Generated in non-secure software */
+    KM_ORIGIN_IMPORTED = 2, /* Imported, origin unknown */
+} keymaster_key_origin_t;
+
+/**
+ * Usability requirements of key blobs.  This defines what system functionality must be available
+ * for the key to function.  For example, key "blobs" which are actually handles referencing
+ * encrypted key material stored in the file system cannot be used until the file system is
+ * available, and should have BLOB_REQUIRES_FILE_SYSTEM.  Other requirements entries will be added
+ * as needed for implementations.  This type is new in 0_4.
+ */
+typedef enum {
+    KM_BLOB_STANDALONE = 0,
+    KM_BLOB_REQUIRES_FILE_SYSTEM = 1,
+} keymaster_key_blob_usage_requirements_t;
+
+/**
+ * Possible purposes of a key (or pair). This type is new in 0_4.
+ */
+typedef enum {
+    KM_PURPOSE_ENCRYPT = 0,
+    KM_PURPOSE_DECRYPT = 1,
+    KM_PURPOSE_SIGN = 2,
+    KM_PURPOSE_VERIFY = 3,
+} keymaster_purpose_t;
+
+typedef struct {
+    const uint8_t* data;
+    size_t data_length;
+} keymaster_blob_t;
+
+typedef struct {
+    keymaster_tag_t tag;
+    union {
+        uint32_t enumerated;   /* KM_ENUM and KM_ENUM_REP */
+        bool boolean;          /* KM_BOOL */
+        uint32_t integer;      /* KM_INT and KM_INT_REP */
+        uint64_t long_integer; /* KM_LONG */
+        uint64_t date_time;    /* KM_DATE */
+        keymaster_blob_t blob; /* KM_BIGNUM and KM_BYTES*/
+    };
+} keymaster_key_param_t;
+
+typedef struct {
+    keymaster_key_param_t* params; /* may be NULL if length == 0 */
+    size_t length;
+} keymaster_key_param_set_t;
+
+/**
+ * Parameters that define a key's characteristics, including authorized modes of usage and access
+ * control restrictions.  The parameters are divided into two categories, those that are enforced by
+ * secure hardware, and those that are not.  For a software-only keymaster implementation the
+ * enforced array must NULL.  Hardware implementations must enforce everything in the enforced
+ * array.
+ */
+typedef struct {
+    keymaster_key_param_set_t hw_enforced;
+    keymaster_key_param_set_t sw_enforced;
+} keymaster_key_characteristics_t;
+
+typedef struct {
+    const uint8_t* key_material;
+    size_t key_material_size;
+} keymaster_key_blob_t;
+
+/**
+ * Formats for key import and export.  At present, only asymmetric key import/export is supported.
+ * In the future this list will expand greatly to accommodate asymmetric key import/export.
+ */
+typedef enum {
+    KM_KEY_FORMAT_X509,   /* for public key export, required */
+    KM_KEY_FORMAT_PKCS8,  /* for asymmetric key pair import, required */
+    KM_KEY_FORMAT_PKCS12, /* for asymmetric key pair import, not required */
+} keymaster_key_format_t;
+
+/**
+ * The keymaster operation API consists of begin, update, finish and abort. This is the type of the
+ * handle used to tie the sequence of calls together.  A 64-bit value is used because it's important
+ * that handles not be predictable.  Implementations must use strong random numbers for handle
+ * values.
+ */
+typedef uint64_t keymaster_operation_handle_t;
+
+typedef enum {
+    KM_ERROR_OK = 0,
+    KM_ERROR_ROOT_OF_TRUST_ALREADY_SET = -1,
+    KM_ERROR_UNSUPPORTED_PURPOSE = -2,
+    KM_ERROR_INCOMPATIBLE_PURPOSE = -3,
+    KM_ERROR_UNSUPPORTED_ALGORITHM = -4,
+    KM_ERROR_INCOMPATIBLE_ALGORITHM = -5,
+    KM_ERROR_UNSUPPORTED_KEY_SIZE = -6,
+    KM_ERROR_UNSUPPORTED_BLOCK_MODE = -7,
+    KM_ERROR_INCOMPATIBLE_BLOCK_MODE = -8,
+    KM_ERROR_UNSUPPORTED_TAG_LENGTH = -9,
+    KM_ERROR_UNSUPPORTED_PADDING_MODE = -10,
+    KM_ERROR_INCOMPATIBLE_PADDING_MODE = -11,
+    KM_ERROR_UNSUPPORTED_DIGEST = -12,
+    KM_ERROR_INCOMPATIBLE_DIGEST = -13,
+    KM_ERROR_INVALID_EXPIRATION_TIME = -14,
+    KM_ERROR_INVALID_USER_ID = -15,
+    KM_ERROR_INVALID_AUTHORIZATION_TIMEOUT = -16,
+    KM_ERROR_UNSUPPORTED_KEY_FORMAT = -17,
+    KM_ERROR_INCOMPATIBLE_KEY_FORMAT = -18,
+    KM_ERROR_UNSUPPORTED_KEY_ENCRYPTION_ALGORITHM = -19,   /* For PKCS8 & PKCS12 */
+    KM_ERROR_UNSUPPORTED_KEY_VERIFICATION_ALGORITHM = -20, /* For PKCS8 & PKCS12 */
+    KM_ERROR_INVALID_INPUT_LENGTH = -21,
+    KM_ERROR_KEY_EXPORT_OPTIONS_INVALID = -22,
+    KM_ERROR_DELEGATION_NOT_ALLOWED = -23,
+    KM_ERROR_KEY_NOT_YET_VALID = -24,
+    KM_ERROR_KEY_EXPIRED = -25,
+    KM_ERROR_KEY_USER_NOT_AUTHENTICATED = -26,
+    KM_ERROR_OUTPUT_PARAMETER_NULL = -27,
+    KM_ERROR_INVALID_OPERATION_HANDLE = -28,
+    KM_ERROR_INSUFFICIENT_BUFFER_SPACE = -29,
+    KM_ERROR_VERIFICATION_FAILED = -30,
+    KM_ERROR_TOO_MANY_OPERATIONS = -31,
+    KM_ERROR_UNEXPECTED_NULL_POINTER = -32,
+    KM_ERROR_INVALID_KEY_BLOB = -33,
+    KM_ERROR_IMPORTED_KEY_NOT_ENCRYPTED = -34,
+    KM_ERROR_IMPORTED_KEY_DECRYPTION_FAILED = -35,
+    KM_ERROR_IMPORTED_KEY_NOT_SIGNED = -36,
+    KM_ERROR_IMPORTED_KEY_VERIFICATION_FAILED = -37,
+    KM_ERROR_INVALID_ARGUMENT = -38,
+    KM_ERROR_UNSUPPORTED_TAG = -39,
+    KM_ERROR_INVALID_TAG = -40,
+    KM_ERROR_MEMORY_ALLOCATION_FAILED = -41,
+    KM_ERROR_INVALID_RESCOPING = -42,
+    KM_ERROR_INVALID_DSA_PARAMS = -43,
+    KM_ERROR_IMPORT_PARAMETER_MISMATCH = -44,
+    KM_ERROR_SECURE_HW_ACCESS_DENIED = -45,
+    KM_ERROR_OPERATION_CANCELLED = -46,
+    KM_ERROR_CONCURRENT_ACCESS_CONFLICT = -47,
+    KM_ERROR_SECURE_HW_BUSY = -48,
+    KM_ERROR_SECURE_HW_COMMUNICATION_FAILED = -49,
+    KM_ERROR_UNSUPPORTED_EC_FIELD = -50,
+    KM_ERROR_UNIMPLEMENTED = -100,
+    KM_ERROR_VERSION_MISMATCH = -101,
+
+    /* Additional error codes may be added by implementations, but implementers should coordinate
+     * with Google to avoid code collision. */
+    KM_ERROR_UNKNOWN_ERROR = -1000,
+} keymaster_error_t;
+
+/**
+ * \deprecated Parameters needed to generate an RSA key.
+ */
+typedef struct {
+    uint32_t modulus_size; /* bits */
+    uint64_t public_exponent;
+} keymaster_rsa_keygen_params_t;
+
+/**
+ * \deprecated Parameters needed to generate a DSA key.
+ */
+typedef struct {
+    uint32_t key_size; /* bits */
+    uint32_t generator_len;
+    uint32_t prime_p_len;
+    uint32_t prime_q_len;
+    const uint8_t* generator;
+    const uint8_t* prime_p;
+    const uint8_t* prime_q;
+} keymaster_dsa_keygen_params_t;
+
+/**
+ * \deprecated Parameters needed to generate an EC key.
+ *
+ * Field size is the only parameter in version 4. The sizes correspond to these required curves:
+ *
+ * 192 = NIST P-192
+ * 224 = NIST P-224
+ * 256 = NIST P-256
+ * 384 = NIST P-384
+ * 521 = NIST P-521
+ *
+ * The parameters for these curves are available at: http://www.nsa.gov/ia/_files/nist-routines.pdf
+ * in Chapter 4.
+ */
+typedef struct { uint32_t field_size; /* bits */ } keymaster_ec_keygen_params_t;
+
+/**
+ * \deprecated Type of padding used for RSA operations.
+ */
+typedef enum {
+    PADDING_NONE,
+} keymaster_rsa_padding_t;
+
+/**
+ * \deprecated
+ */
+typedef struct { keymaster_digest_t digest_type; } keymaster_dsa_sign_params_t;
+
+/**
+ * \deprecated
+ */
+typedef struct { keymaster_digest_t digest_type; } keymaster_ec_sign_params_t;
+
+/**
+ *\deprecated
+ */
+typedef struct {
+    keymaster_digest_t digest_type;
+    keymaster_rsa_padding_t padding_type;
+} keymaster_rsa_sign_params_t;
+
+/* Convenience functions for manipulating keymaster tag types */
+
+static inline keymaster_tag_type_t keymaster_tag_get_type(keymaster_tag_t tag) {
+    return (keymaster_tag_type_t)(tag & (0xF << 28));
+}
+
+static inline uint32_t keymaster_tag_mask_type(keymaster_tag_t tag) {
+    return tag & 0x0FFFFFFF;
+}
+
+static inline bool keymaster_tag_type_repeatable(keymaster_tag_type_t type) {
+    switch (type) {
+    case KM_INT_REP:
+    case KM_ENUM_REP:
+        return true;
+    default:
+        return false;
+    }
+}
+
+static inline bool keymaster_tag_repeatable(keymaster_tag_t tag) {
+    return keymaster_tag_type_repeatable(keymaster_tag_get_type(tag));
+}
+
+/* Convenience functions for manipulating keymaster_key_param_t structs */
+
+inline keymaster_key_param_t keymaster_param_enum(keymaster_tag_t tag, uint32_t value) {
+    // assert(keymaster_tag_get_type(tag) == KM_ENUM || keymaster_tag_get_type(tag) == KM_ENUM_REP);
+    keymaster_key_param_t param;
+    memset(&param, 0, sizeof(param));
+    param.tag = tag;
+    param.enumerated = value;
+    return param;
+}
+
+inline keymaster_key_param_t keymaster_param_int(keymaster_tag_t tag, uint32_t value) {
+    // assert(keymaster_tag_get_type(tag) == KM_INT || keymaster_tag_get_type(tag) == KM_INT_REP);
+    keymaster_key_param_t param;
+    memset(&param, 0, sizeof(param));
+    param.tag = tag;
+    param.integer = value;
+    return param;
+}
+
+inline keymaster_key_param_t keymaster_param_long(keymaster_tag_t tag, uint64_t value) {
+    // assert(keymaster_tag_get_type(tag) == KM_LONG);
+    keymaster_key_param_t param;
+    memset(&param, 0, sizeof(param));
+    param.tag = tag;
+    param.long_integer = value;
+    return param;
+}
+
+inline keymaster_key_param_t keymaster_param_blob(keymaster_tag_t tag, const uint8_t* bytes,
+                                                  size_t bytes_len) {
+    // assert(keymaster_tag_get_type(tag) == KM_BYTES || keymaster_tag_get_type(tag) == KM_BIGNUM);
+    keymaster_key_param_t param;
+    memset(&param, 0, sizeof(param));
+    param.tag = tag;
+    param.blob.data = (uint8_t*)bytes;
+    param.blob.data_length = bytes_len;
+    return param;
+}
+
+inline keymaster_key_param_t keymaster_param_bool(keymaster_tag_t tag) {
+    // assert(keymaster_tag_get_type(tag) == KM_BOOL);
+    keymaster_key_param_t param;
+    memset(&param, 0, sizeof(param));
+    param.tag = tag;
+    param.boolean = true;
+    return param;
+}
+
+inline keymaster_key_param_t keymaster_param_date(keymaster_tag_t tag, uint64_t value) {
+    // assert(keymaster_tag_get_type(tag) == KM_DATE);
+    keymaster_key_param_t param;
+    memset(&param, 0, sizeof(param));
+    param.tag = tag;
+    param.date_time = value;
+    return param;
+}
+
+inline void keymaster_free_param_values(keymaster_key_param_t* param, size_t param_count) {
+    while (param_count-- > 0) {
+        switch (keymaster_tag_get_type(param->tag)) {
+        case KM_BIGNUM:
+        case KM_BYTES:
+            free((void*)param->blob.data);
+            param->blob.data = NULL;
+            break;
+        default:
+            // NOP
+            break;
+        }
+        ++param;
+    }
+}
+
+inline void keymaster_free_param_set(keymaster_key_param_set_t* set) {
+    if (set) {
+        keymaster_free_param_values(set->params, set->length);
+        free(set->params);
+        set->params = NULL;
+    }
+}
+
+inline void keymaster_free_characteristics(keymaster_key_characteristics_t* characteristics) {
+    if (characteristics) {
+        keymaster_free_param_set(&characteristics->hw_enforced);
+        keymaster_free_param_set(&characteristics->sw_enforced);
+    }
+}
+
+#if defined(__cplusplus)
+}  // extern "C"
+#endif  // defined(__cplusplus)
+
+#endif  // ANDROID_HARDWARE_KEYMASTER_DEFS_H