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Shawn Willden9d645a02014-06-12 13:48:46 -06001/*
2 * Copyright (C) 2014 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17#ifndef ANDROID_HARDWARE_KEYMASTER_DEFS_H
18#define ANDROID_HARDWARE_KEYMASTER_DEFS_H
19
20#include <stdint.h>
21#include <stdlib.h>
22#include <string.h>
23
Shawn Willden7eaa15f2015-06-03 09:03:20 -060024#ifdef __cplusplus
Shawn Willdenc51d01e2015-03-18 18:59:52 -060025extern "C" {
26#endif // __cplusplus
Shawn Willden9d645a02014-06-12 13:48:46 -060027
Shawn Willden9d645a02014-06-12 13:48:46 -060028/**
29 * Authorization tags each have an associated type. This enumeration facilitates tagging each with
30 * a type, by using the high four bits (of an implied 32-bit unsigned enum value) to specify up to
31 * 16 data types. These values are ORed with tag IDs to generate the final tag ID values.
32 */
33typedef enum {
34 KM_INVALID = 0 << 28, /* Invalid type, used to designate a tag as uninitialized */
35 KM_ENUM = 1 << 28,
36 KM_ENUM_REP = 2 << 28, /* Repeatable enumeration value. */
Shawn Willdenfe6bcfa2015-06-24 20:59:14 +000037 KM_UINT = 3 << 28,
38 KM_UINT_REP = 4 << 28, /* Repeatable integer value */
39 KM_ULONG = 5 << 28,
Shawn Willden9d645a02014-06-12 13:48:46 -060040 KM_DATE = 6 << 28,
41 KM_BOOL = 7 << 28,
42 KM_BIGNUM = 8 << 28,
43 KM_BYTES = 9 << 28,
Shawn Willdenfe6bcfa2015-06-24 20:59:14 +000044 KM_ULONG_REP = 10 << 28, /* Repeatable long value */
Shawn Willden9d645a02014-06-12 13:48:46 -060045} keymaster_tag_type_t;
46
47typedef enum {
48 KM_TAG_INVALID = KM_INVALID | 0,
49
50 /*
51 * Tags that must be semantically enforced by hardware and software implementations.
52 */
53
54 /* Crypto parameters */
Shawn Willdencf30fe12015-12-21 16:29:10 -070055 KM_TAG_PURPOSE = KM_ENUM_REP | 1, /* keymaster_purpose_t. */
56 KM_TAG_ALGORITHM = KM_ENUM | 2, /* keymaster_algorithm_t. */
57 KM_TAG_KEY_SIZE = KM_UINT | 3, /* Key size in bits. */
58 KM_TAG_BLOCK_MODE = KM_ENUM_REP | 4, /* keymaster_block_mode_t. */
59 KM_TAG_DIGEST = KM_ENUM_REP | 5, /* keymaster_digest_t. */
60 KM_TAG_PADDING = KM_ENUM_REP | 6, /* keymaster_padding_t. */
61 KM_TAG_CALLER_NONCE = KM_BOOL | 7, /* Allow caller to specify nonce or IV. */
62 KM_TAG_MIN_MAC_LENGTH = KM_UINT | 8, /* Minimum length of MAC or AEAD authentication tag in
63 * bits. */
64 KM_TAG_KDF = KM_ENUM_REP | 9, /* keymaster_kdf_t (keymaster2) */
65 KM_TAG_EC_CURVE = KM_ENUM | 10, /* keymaster_ec_curve_t (keymaster2) */
Shawn Willden9d645a02014-06-12 13:48:46 -060066
Shawn Willden9d645a02014-06-12 13:48:46 -060067 /* Algorithm-specific. */
Shawn Willdenfe6bcfa2015-06-24 20:59:14 +000068 KM_TAG_RSA_PUBLIC_EXPONENT = KM_ULONG | 200,
Thai Duong40d59c82015-04-02 21:41:37 -070069 KM_TAG_ECIES_SINGLE_HASH_MODE = KM_BOOL | 201, /* Whether the ephemeral public key is fed into
Shawn Willdencf30fe12015-12-21 16:29:10 -070070 * the KDF */
71 KM_TAG_INCLUDE_UNIQUE_ID = KM_BOOL | 202, /* If true, attestation certificates for this key
72 * will contain an application-scoped and
73 * time-bounded device-unique ID. (keymaster2) */
Shawn Willden9d645a02014-06-12 13:48:46 -060074
Shawn Willdenfb769fc2015-05-11 09:24:48 -060075 /* Other hardware-enforced. */
76 KM_TAG_BLOB_USAGE_REQUIREMENTS = KM_ENUM | 301, /* keymaster_key_blob_usage_requirements_t */
77 KM_TAG_BOOTLOADER_ONLY = KM_BOOL | 302, /* Usable only by bootloader */
78
Shawn Willden9d645a02014-06-12 13:48:46 -060079 /*
80 * Tags that should be semantically enforced by hardware if possible and will otherwise be
81 * enforced by software (keystore).
82 */
83
84 /* Key validity period */
85 KM_TAG_ACTIVE_DATETIME = KM_DATE | 400, /* Start of validity */
86 KM_TAG_ORIGINATION_EXPIRE_DATETIME = KM_DATE | 401, /* Date when new "messages" should no
87 longer be created. */
88 KM_TAG_USAGE_EXPIRE_DATETIME = KM_DATE | 402, /* Date when existing "messages" should no
89 longer be trusted. */
Shawn Willdenfe6bcfa2015-06-24 20:59:14 +000090 KM_TAG_MIN_SECONDS_BETWEEN_OPS = KM_UINT | 403, /* Minimum elapsed time between
Shawn Willden9d645a02014-06-12 13:48:46 -060091 cryptographic operations with the key. */
Shawn Willdenfe6bcfa2015-06-24 20:59:14 +000092 KM_TAG_MAX_USES_PER_BOOT = KM_UINT | 404, /* Number of times the key can be used per
Shawn Willdendc0007b2015-01-23 01:01:21 -070093 boot. */
Shawn Willden9d645a02014-06-12 13:48:46 -060094
95 /* User authentication */
Shawn Willdenfe6bcfa2015-06-24 20:59:14 +000096 KM_TAG_ALL_USERS = KM_BOOL | 500, /* Reserved for future use -- ignore */
97 KM_TAG_USER_ID = KM_UINT | 501, /* Reserved for future use -- ignore */
98 KM_TAG_USER_SECURE_ID = KM_ULONG_REP | 502, /* Secure ID of authorized user or authenticator(s).
99 Disallowed if KM_TAG_ALL_USERS or
100 KM_TAG_NO_AUTH_REQUIRED is present. */
101 KM_TAG_NO_AUTH_REQUIRED = KM_BOOL | 503, /* If key is usable without authentication. */
102 KM_TAG_USER_AUTH_TYPE = KM_ENUM | 504, /* Bitmask of authenticator types allowed when
103 * KM_TAG_USER_SECURE_ID contains a secure user ID,
104 * rather than a secure authenticator ID. Defined in
105 * hw_authenticator_type_t in hw_auth_token.h. */
106 KM_TAG_AUTH_TIMEOUT = KM_UINT | 505, /* Required freshness of user authentication for
107 private/secret key operations, in seconds.
108 Public key operations require no authentication.
109 If absent, authentication is required for every
110 use. Authentication state is lost when the
111 device is powered off. */
Shawn Willden71ca0102016-01-26 07:00:27 -0700112 KM_TAG_ALLOW_WHILE_ON_BODY = KM_BOOL | 506, /* Allow key to be used after authentication timeout
113 * if device is still on-body (requires secure
114 * on-body sensor. */
Shawn Willden9d645a02014-06-12 13:48:46 -0600115
116 /* Application access control */
Shawn Willdencf30fe12015-12-21 16:29:10 -0700117 KM_TAG_ALL_APPLICATIONS = KM_BOOL | 600, /* Specified to indicate key is usable by all
118 * applications. */
119 KM_TAG_APPLICATION_ID = KM_BYTES | 601, /* Byte string identifying the authorized
120 * application. */
121 KM_TAG_EXPORTABLE = KM_BOOL | 602, /* If true, private/secret key can be exported, but
122 * only if all access control requirements for use are
123 * met. (keymaster2) */
Shawn Willden9d645a02014-06-12 13:48:46 -0600124
125 /*
126 * Semantically unenforceable tags, either because they have no specific meaning or because
127 * they're informational only.
128 */
Shawn Willden7fd11182016-02-03 07:39:40 -0700129 KM_TAG_APPLICATION_DATA = KM_BYTES | 700, /* Data provided by authorized application. */
130 KM_TAG_CREATION_DATETIME = KM_DATE | 701, /* Key creation time */
131 KM_TAG_ORIGIN = KM_ENUM | 702, /* keymaster_key_origin_t. */
132 KM_TAG_ROLLBACK_RESISTANT = KM_BOOL | 703, /* Whether key is rollback-resistant. */
133 KM_TAG_ROOT_OF_TRUST = KM_BYTES | 704, /* Root of trust ID. */
134 KM_TAG_OS_VERSION = KM_UINT | 705, /* Version of system (keymaster2) */
135 KM_TAG_OS_PATCHLEVEL = KM_UINT | 706, /* Patch level of system (keymaster2) */
136 KM_TAG_UNIQUE_ID = KM_BYTES | 707, /* Used to provide unique ID in attestation */
137 KM_TAG_ATTESTATION_CHALLENGE = KM_BYTES | 708, /* Used to provide challenge in attestation */
Janis Danisevskisb62995e2016-05-20 18:11:41 +0100138 KM_TAG_ATTESTATION_APPLICATION_ID = KM_BYTES | 709, /* Used to identify the set of possible
139 * applications of which one has initiated
140 * a key attestation */
Bartosz Fabianowski9d2f5b92017-01-23 15:36:42 +0100141 KM_TAG_ATTESTATION_ID_BRAND = KM_BYTES | 710, /* Used to provide the device's brand name to be
142 included in attestation */
143 KM_TAG_ATTESTATION_ID_DEVICE = KM_BYTES | 711, /* Used to provide the device's device name to be
144 included in attestation */
145 KM_TAG_ATTESTATION_ID_PRODUCT = KM_BYTES | 712, /* Used to provide the device's product name to
146 be included in attestation */
147 KM_TAG_ATTESTATION_ID_SERIAL = KM_BYTES | 713, /* Used to provide the device's serial number to
148 be included in attestation */
149 KM_TAG_ATTESTATION_ID_IMEI = KM_BYTES | 714, /* Used to provide the device's IMEI to be
150 included in attestation */
151 KM_TAG_ATTESTATION_ID_MEID = KM_BYTES | 715, /* Used to provide the device's MEID to be
152 included in attestation */
Bartosz Fabianowski81b7b5f2017-03-20 14:01:35 +0100153 KM_TAG_ATTESTATION_ID_MANUFACTURER = KM_BYTES | 716, /* Used to provide the device's
154 manufacturer name to be included in
155 attestation */
156 KM_TAG_ATTESTATION_ID_MODEL = KM_BYTES | 717, /* Used to provide the device's model name to be
157 included in attestation */
Shawn Willden9d645a02014-06-12 13:48:46 -0600158
Shawn Willden67ba9e82015-02-06 17:04:53 -0700159 /* Tags used only to provide data to or receive data from operations */
160 KM_TAG_ASSOCIATED_DATA = KM_BYTES | 1000, /* Used to provide associated data for AEAD modes. */
Shawn Willden41e91e92015-01-30 06:23:26 -0700161 KM_TAG_NONCE = KM_BYTES | 1001, /* Nonce or Initialization Vector */
Shawn Willdenda89dde2015-06-18 12:09:20 -0600162 KM_TAG_AUTH_TOKEN = KM_BYTES | 1002, /* Authentication token that proves secure user
Shawn Willdenc3ab05c2015-03-14 08:23:41 -0600163 authentication has been performed. Structure
164 defined in hw_auth_token_t in hw_auth_token.h. */
Shawn Willdencf30fe12015-12-21 16:29:10 -0700165 KM_TAG_MAC_LENGTH = KM_UINT | 1003, /* MAC or AEAD authentication tag length in
166 * bits. */
167
168 KM_TAG_RESET_SINCE_ID_ROTATION = KM_BOOL | 1004, /* Whether the device has beeen factory reset
169 since the last unique ID rotation. Used for
170 key attestation. */
Shawn Willden9d645a02014-06-12 13:48:46 -0600171} keymaster_tag_t;
172
173/**
174 * Algorithms that may be provided by keymaster implementations. Those that must be provided by all
Shawn Willdenfd4b4d52015-02-24 09:17:38 -0700175 * implementations are tagged as "required".
Shawn Willden9d645a02014-06-12 13:48:46 -0600176 */
177typedef enum {
178 /* Asymmetric algorithms. */
Shawn Willdene9797a72015-04-07 13:39:12 -0600179 KM_ALGORITHM_RSA = 1,
180 // KM_ALGORITHM_DSA = 2, -- Removed, do not re-use value 2.
181 KM_ALGORITHM_EC = 3,
182
183 /* Block ciphers algorithms */
184 KM_ALGORITHM_AES = 32,
185
Shawn Willden9d645a02014-06-12 13:48:46 -0600186 /* MAC algorithms */
Shawn Willdene9797a72015-04-07 13:39:12 -0600187 KM_ALGORITHM_HMAC = 128,
Shawn Willden9d645a02014-06-12 13:48:46 -0600188} keymaster_algorithm_t;
189
190/**
Shawn Willdenc7deeda2015-04-07 13:40:00 -0600191 * Symmetric block cipher modes provided by keymaster implementations.
Shawn Willden9d645a02014-06-12 13:48:46 -0600192 */
193typedef enum {
194 /* Unauthenticated modes, usable only for encryption/decryption and not generally recommended
195 * except for compatibility with existing other protocols. */
Shawn Willden4c19a3a2015-06-01 11:40:24 -0600196 KM_MODE_ECB = 1,
Shawn Willdenc7deeda2015-04-07 13:40:00 -0600197 KM_MODE_CBC = 2,
Shawn Willden4c19a3a2015-06-01 11:40:24 -0600198 KM_MODE_CTR = 3,
Shawn Willdenc7deeda2015-04-07 13:40:00 -0600199
Shawn Willden9d645a02014-06-12 13:48:46 -0600200 /* Authenticated modes, usable for encryption/decryption and signing/verification. Recommended
Shawn Willdenc7deeda2015-04-07 13:40:00 -0600201 * over unauthenticated modes for all purposes. */
Shawn Willden4c19a3a2015-06-01 11:40:24 -0600202 KM_MODE_GCM = 32,
Shawn Willden9d645a02014-06-12 13:48:46 -0600203} keymaster_block_mode_t;
204
205/**
206 * Padding modes that may be applied to plaintext for encryption operations. This list includes
207 * padding modes for both symmetric and asymmetric algorithms. Note that implementations should not
208 * provide all possible combinations of algorithm and padding, only the
209 * cryptographically-appropriate pairs.
210 */
211typedef enum {
Shawn Willden8412fdc2015-04-07 13:41:30 -0600212 KM_PAD_NONE = 1, /* deprecated */
213 KM_PAD_RSA_OAEP = 2,
214 KM_PAD_RSA_PSS = 3,
Shawn Willden9d645a02014-06-12 13:48:46 -0600215 KM_PAD_RSA_PKCS1_1_5_ENCRYPT = 4,
216 KM_PAD_RSA_PKCS1_1_5_SIGN = 5,
Shawn Willden8412fdc2015-04-07 13:41:30 -0600217 KM_PAD_PKCS7 = 64,
Shawn Willden9d645a02014-06-12 13:48:46 -0600218} keymaster_padding_t;
219
220/**
Shawn Willdenfe6c4f02015-04-07 14:02:28 -0600221 * Digests provided by keymaster implementations.
Shawn Willden9d645a02014-06-12 13:48:46 -0600222 */
223typedef enum {
Shawn Willdenfe6c4f02015-04-07 14:02:28 -0600224 KM_DIGEST_NONE = 0,
225 KM_DIGEST_MD5 = 1, /* Optional, may not be implemented in hardware, will be handled in software
226 * if needed. */
227 KM_DIGEST_SHA1 = 2,
228 KM_DIGEST_SHA_2_224 = 3,
229 KM_DIGEST_SHA_2_256 = 4,
230 KM_DIGEST_SHA_2_384 = 5,
231 KM_DIGEST_SHA_2_512 = 6,
Shawn Willden9d645a02014-06-12 13:48:46 -0600232} keymaster_digest_t;
233
Thai Duong40d59c82015-04-02 21:41:37 -0700234/*
235 * Key derivation functions, mostly used in ECIES.
236 */
237typedef enum {
Shawn Willdencf30fe12015-12-21 16:29:10 -0700238 /* Do not apply a key derivation function; use the raw agreed key */
239 KM_KDF_NONE = 0,
Thai Duong40d59c82015-04-02 21:41:37 -0700240 /* HKDF defined in RFC 5869 with SHA256 */
Shawn Willdencf30fe12015-12-21 16:29:10 -0700241 KM_KDF_RFC5869_SHA256 = 1,
Thai Duong40d59c82015-04-02 21:41:37 -0700242 /* KDF1 defined in ISO 18033-2 with SHA1 */
Shawn Willdencf30fe12015-12-21 16:29:10 -0700243 KM_KDF_ISO18033_2_KDF1_SHA1 = 2,
Thai Duong40d59c82015-04-02 21:41:37 -0700244 /* KDF1 defined in ISO 18033-2 with SHA256 */
Shawn Willdencf30fe12015-12-21 16:29:10 -0700245 KM_KDF_ISO18033_2_KDF1_SHA256 = 3,
Thai Duong40d59c82015-04-02 21:41:37 -0700246 /* KDF2 defined in ISO 18033-2 with SHA1 */
Shawn Willdencf30fe12015-12-21 16:29:10 -0700247 KM_KDF_ISO18033_2_KDF2_SHA1 = 4,
Thai Duong40d59c82015-04-02 21:41:37 -0700248 /* KDF2 defined in ISO 18033-2 with SHA256 */
Shawn Willdencf30fe12015-12-21 16:29:10 -0700249 KM_KDF_ISO18033_2_KDF2_SHA256 = 5,
Thai Duong40d59c82015-04-02 21:41:37 -0700250} keymaster_kdf_t;
251
252/**
253 * Supported EC curves, used in ECDSA/ECIES.
254 */
255typedef enum {
256 KM_EC_CURVE_P_224 = 0,
257 KM_EC_CURVE_P_256 = 1,
258 KM_EC_CURVE_P_384 = 2,
259 KM_EC_CURVE_P_521 = 3,
260} keymaster_ec_curve_t;
261
Shawn Willden9d645a02014-06-12 13:48:46 -0600262/**
Shawn Willden8d6cf252015-04-07 13:56:30 -0600263 * The origin of a key (or pair), i.e. where it was generated. Note that KM_TAG_ORIGIN can be found
264 * in either the hardware-enforced or software-enforced list for a key, indicating whether the key
265 * is hardware or software-based. Specifically, a key with KM_ORIGIN_GENERATED in the
266 * hardware-enforced list is guaranteed never to have existed outide the secure hardware.
Shawn Willden9d645a02014-06-12 13:48:46 -0600267 */
268typedef enum {
Shawn Willdencf30fe12015-12-21 16:29:10 -0700269 KM_ORIGIN_GENERATED = 0, /* Generated in keymaster. Should not exist outside the TEE. */
270 KM_ORIGIN_DERIVED = 1, /* Derived inside keymaster. Likely exists off-device. */
271 KM_ORIGIN_IMPORTED = 2, /* Imported into keymaster. Existed as cleartext in Android. */
Shawn Willdend359b042015-04-13 11:07:24 -0600272 KM_ORIGIN_UNKNOWN = 3, /* Keymaster did not record origin. This value can only be seen on
273 * keys in a keymaster0 implementation. The keymaster0 adapter uses
274 * this value to document the fact that it is unkown whether the key
275 * was generated inside or imported into keymaster. */
Shawn Willden9d645a02014-06-12 13:48:46 -0600276} keymaster_key_origin_t;
277
278/**
279 * Usability requirements of key blobs. This defines what system functionality must be available
280 * for the key to function. For example, key "blobs" which are actually handles referencing
281 * encrypted key material stored in the file system cannot be used until the file system is
282 * available, and should have BLOB_REQUIRES_FILE_SYSTEM. Other requirements entries will be added
Shawn Willdencf30fe12015-12-21 16:29:10 -0700283 * as needed for implementations.
Shawn Willden9d645a02014-06-12 13:48:46 -0600284 */
285typedef enum {
286 KM_BLOB_STANDALONE = 0,
287 KM_BLOB_REQUIRES_FILE_SYSTEM = 1,
288} keymaster_key_blob_usage_requirements_t;
289
290/**
Shawn Willdencf30fe12015-12-21 16:29:10 -0700291 * Possible purposes of a key (or pair).
Shawn Willden9d645a02014-06-12 13:48:46 -0600292 */
293typedef enum {
Shawn Willdencf30fe12015-12-21 16:29:10 -0700294 KM_PURPOSE_ENCRYPT = 0, /* Usable with RSA, EC and AES keys. */
295 KM_PURPOSE_DECRYPT = 1, /* Usable with RSA, EC and AES keys. */
296 KM_PURPOSE_SIGN = 2, /* Usable with RSA, EC and HMAC keys. */
297 KM_PURPOSE_VERIFY = 3, /* Usable with RSA, EC and HMAC keys. */
298 KM_PURPOSE_DERIVE_KEY = 4, /* Usable with EC keys. */
Shawn Willden9d645a02014-06-12 13:48:46 -0600299} keymaster_purpose_t;
300
301typedef struct {
302 const uint8_t* data;
303 size_t data_length;
304} keymaster_blob_t;
305
306typedef struct {
307 keymaster_tag_t tag;
308 union {
309 uint32_t enumerated; /* KM_ENUM and KM_ENUM_REP */
310 bool boolean; /* KM_BOOL */
311 uint32_t integer; /* KM_INT and KM_INT_REP */
312 uint64_t long_integer; /* KM_LONG */
313 uint64_t date_time; /* KM_DATE */
314 keymaster_blob_t blob; /* KM_BIGNUM and KM_BYTES*/
315 };
316} keymaster_key_param_t;
317
318typedef struct {
319 keymaster_key_param_t* params; /* may be NULL if length == 0 */
320 size_t length;
321} keymaster_key_param_set_t;
322
323/**
324 * Parameters that define a key's characteristics, including authorized modes of usage and access
325 * control restrictions. The parameters are divided into two categories, those that are enforced by
326 * secure hardware, and those that are not. For a software-only keymaster implementation the
327 * enforced array must NULL. Hardware implementations must enforce everything in the enforced
328 * array.
329 */
330typedef struct {
331 keymaster_key_param_set_t hw_enforced;
332 keymaster_key_param_set_t sw_enforced;
333} keymaster_key_characteristics_t;
334
335typedef struct {
336 const uint8_t* key_material;
337 size_t key_material_size;
338} keymaster_key_blob_t;
339
Shawn Willdencf30fe12015-12-21 16:29:10 -0700340typedef struct {
341 keymaster_blob_t* entries;
342 size_t entry_count;
343} keymaster_cert_chain_t;
344
Shawn Willden30802762016-03-09 19:42:47 -0700345typedef enum {
346 KM_VERIFIED_BOOT_VERIFIED = 0, /* Full chain of trust extending from the bootloader to
347 * verified partitions, including the bootloader, boot
348 * partition, and all verified partitions*/
349 KM_VERIFIED_BOOT_SELF_SIGNED = 1, /* The boot partition has been verified using the embedded
350 * certificate, and the signature is valid. The bootloader
351 * displays a warning and the fingerprint of the public
352 * key before allowing the boot process to continue.*/
353 KM_VERIFIED_BOOT_UNVERIFIED = 2, /* The device may be freely modified. Device integrity is left
354 * to the user to verify out-of-band. The bootloader
355 * displays a warning to the user before allowing the boot
356 * process to continue */
357 KM_VERIFIED_BOOT_FAILED = 3, /* The device failed verification. The bootloader displays a
358 * warning and stops the boot process, so no keymaster
359 * implementation should ever actually return this value,
360 * since it should not run. Included here only for
361 * completeness. */
362} keymaster_verified_boot_t;
363
Shawn Willdenaeb15d62016-03-19 08:56:43 -0600364typedef enum {
365 KM_SECURITY_LEVEL_SOFTWARE = 0,
366 KM_SECURITY_LEVEL_TRUSTED_ENVIRONMENT = 1,
367} keymaster_security_level_t;
368
Shawn Willden9d645a02014-06-12 13:48:46 -0600369/**
Shawn Willdencf30fe12015-12-21 16:29:10 -0700370 * Formats for key import and export.
Shawn Willden9d645a02014-06-12 13:48:46 -0600371 */
372typedef enum {
Shawn Willdenfb769fc2015-05-11 09:24:48 -0600373 KM_KEY_FORMAT_X509 = 0, /* for public key export */
374 KM_KEY_FORMAT_PKCS8 = 1, /* for asymmetric key pair import */
Shawn Willdencf30fe12015-12-21 16:29:10 -0700375 KM_KEY_FORMAT_RAW = 3, /* for symmetric key import and export*/
Shawn Willden9d645a02014-06-12 13:48:46 -0600376} keymaster_key_format_t;
377
378/**
379 * The keymaster operation API consists of begin, update, finish and abort. This is the type of the
380 * handle used to tie the sequence of calls together. A 64-bit value is used because it's important
381 * that handles not be predictable. Implementations must use strong random numbers for handle
382 * values.
383 */
384typedef uint64_t keymaster_operation_handle_t;
385
386typedef enum {
387 KM_ERROR_OK = 0,
388 KM_ERROR_ROOT_OF_TRUST_ALREADY_SET = -1,
389 KM_ERROR_UNSUPPORTED_PURPOSE = -2,
390 KM_ERROR_INCOMPATIBLE_PURPOSE = -3,
391 KM_ERROR_UNSUPPORTED_ALGORITHM = -4,
392 KM_ERROR_INCOMPATIBLE_ALGORITHM = -5,
393 KM_ERROR_UNSUPPORTED_KEY_SIZE = -6,
394 KM_ERROR_UNSUPPORTED_BLOCK_MODE = -7,
395 KM_ERROR_INCOMPATIBLE_BLOCK_MODE = -8,
Shawn Willden6b424be2015-01-26 13:04:28 -0700396 KM_ERROR_UNSUPPORTED_MAC_LENGTH = -9,
Shawn Willden9d645a02014-06-12 13:48:46 -0600397 KM_ERROR_UNSUPPORTED_PADDING_MODE = -10,
398 KM_ERROR_INCOMPATIBLE_PADDING_MODE = -11,
399 KM_ERROR_UNSUPPORTED_DIGEST = -12,
400 KM_ERROR_INCOMPATIBLE_DIGEST = -13,
401 KM_ERROR_INVALID_EXPIRATION_TIME = -14,
402 KM_ERROR_INVALID_USER_ID = -15,
403 KM_ERROR_INVALID_AUTHORIZATION_TIMEOUT = -16,
404 KM_ERROR_UNSUPPORTED_KEY_FORMAT = -17,
405 KM_ERROR_INCOMPATIBLE_KEY_FORMAT = -18,
406 KM_ERROR_UNSUPPORTED_KEY_ENCRYPTION_ALGORITHM = -19, /* For PKCS8 & PKCS12 */
407 KM_ERROR_UNSUPPORTED_KEY_VERIFICATION_ALGORITHM = -20, /* For PKCS8 & PKCS12 */
408 KM_ERROR_INVALID_INPUT_LENGTH = -21,
409 KM_ERROR_KEY_EXPORT_OPTIONS_INVALID = -22,
410 KM_ERROR_DELEGATION_NOT_ALLOWED = -23,
411 KM_ERROR_KEY_NOT_YET_VALID = -24,
412 KM_ERROR_KEY_EXPIRED = -25,
413 KM_ERROR_KEY_USER_NOT_AUTHENTICATED = -26,
414 KM_ERROR_OUTPUT_PARAMETER_NULL = -27,
415 KM_ERROR_INVALID_OPERATION_HANDLE = -28,
416 KM_ERROR_INSUFFICIENT_BUFFER_SPACE = -29,
417 KM_ERROR_VERIFICATION_FAILED = -30,
418 KM_ERROR_TOO_MANY_OPERATIONS = -31,
419 KM_ERROR_UNEXPECTED_NULL_POINTER = -32,
420 KM_ERROR_INVALID_KEY_BLOB = -33,
421 KM_ERROR_IMPORTED_KEY_NOT_ENCRYPTED = -34,
422 KM_ERROR_IMPORTED_KEY_DECRYPTION_FAILED = -35,
423 KM_ERROR_IMPORTED_KEY_NOT_SIGNED = -36,
424 KM_ERROR_IMPORTED_KEY_VERIFICATION_FAILED = -37,
425 KM_ERROR_INVALID_ARGUMENT = -38,
426 KM_ERROR_UNSUPPORTED_TAG = -39,
427 KM_ERROR_INVALID_TAG = -40,
428 KM_ERROR_MEMORY_ALLOCATION_FAILED = -41,
Shawn Willden9d645a02014-06-12 13:48:46 -0600429 KM_ERROR_IMPORT_PARAMETER_MISMATCH = -44,
430 KM_ERROR_SECURE_HW_ACCESS_DENIED = -45,
431 KM_ERROR_OPERATION_CANCELLED = -46,
432 KM_ERROR_CONCURRENT_ACCESS_CONFLICT = -47,
433 KM_ERROR_SECURE_HW_BUSY = -48,
434 KM_ERROR_SECURE_HW_COMMUNICATION_FAILED = -49,
435 KM_ERROR_UNSUPPORTED_EC_FIELD = -50,
Shawn Willdened941112015-03-11 21:53:59 -0600436 KM_ERROR_MISSING_NONCE = -51,
437 KM_ERROR_INVALID_NONCE = -52,
Shawn Willden4144c642015-06-01 11:40:34 -0600438 KM_ERROR_MISSING_MAC_LENGTH = -53,
Shawn Willden396d6cb2015-06-18 12:16:17 -0600439 KM_ERROR_KEY_RATE_LIMIT_EXCEEDED = -54,
Shawn Willden4bdd7cb2015-04-28 00:00:27 -0600440 KM_ERROR_CALLER_NONCE_PROHIBITED = -55,
Shawn Willden396d6cb2015-06-18 12:16:17 -0600441 KM_ERROR_KEY_MAX_OPS_EXCEEDED = -56,
Shawn Willdena3f0ab52015-07-08 06:04:52 -0600442 KM_ERROR_INVALID_MAC_LENGTH = -57,
443 KM_ERROR_MISSING_MIN_MAC_LENGTH = -58,
444 KM_ERROR_UNSUPPORTED_MIN_MAC_LENGTH = -59,
Thai Duong40d59c82015-04-02 21:41:37 -0700445 KM_ERROR_UNSUPPORTED_KDF = -60,
446 KM_ERROR_UNSUPPORTED_EC_CURVE = -61,
Shawn Willdencf30fe12015-12-21 16:29:10 -0700447 KM_ERROR_KEY_REQUIRES_UPGRADE = -62,
Shawn Willden7fd11182016-02-03 07:39:40 -0700448 KM_ERROR_ATTESTATION_CHALLENGE_MISSING = -63,
Shawn Willden30802762016-03-09 19:42:47 -0700449 KM_ERROR_KEYMASTER_NOT_CONFIGURED = -64,
Janis Danisevskis36966852016-06-01 13:39:09 -0700450 KM_ERROR_ATTESTATION_APPLICATION_ID_MISSING = -65,
Bartosz Fabianowski9d2f5b92017-01-23 15:36:42 +0100451 KM_ERROR_CANNOT_ATTEST_IDS = -66,
Shawn Willdened941112015-03-11 21:53:59 -0600452
Shawn Willden9d645a02014-06-12 13:48:46 -0600453 KM_ERROR_UNIMPLEMENTED = -100,
454 KM_ERROR_VERSION_MISMATCH = -101,
455
Shawn Willden9d645a02014-06-12 13:48:46 -0600456 KM_ERROR_UNKNOWN_ERROR = -1000,
457} keymaster_error_t;
458
Shawn Willden9d645a02014-06-12 13:48:46 -0600459/* Convenience functions for manipulating keymaster tag types */
460
461static inline keymaster_tag_type_t keymaster_tag_get_type(keymaster_tag_t tag) {
462 return (keymaster_tag_type_t)(tag & (0xF << 28));
463}
464
465static inline uint32_t keymaster_tag_mask_type(keymaster_tag_t tag) {
466 return tag & 0x0FFFFFFF;
467}
468
469static inline bool keymaster_tag_type_repeatable(keymaster_tag_type_t type) {
470 switch (type) {
Shawn Willdenfe6bcfa2015-06-24 20:59:14 +0000471 case KM_UINT_REP:
Shawn Willden9d645a02014-06-12 13:48:46 -0600472 case KM_ENUM_REP:
473 return true;
474 default:
475 return false;
476 }
477}
478
479static inline bool keymaster_tag_repeatable(keymaster_tag_t tag) {
480 return keymaster_tag_type_repeatable(keymaster_tag_get_type(tag));
481}
482
483/* Convenience functions for manipulating keymaster_key_param_t structs */
484
485inline keymaster_key_param_t keymaster_param_enum(keymaster_tag_t tag, uint32_t value) {
486 // assert(keymaster_tag_get_type(tag) == KM_ENUM || keymaster_tag_get_type(tag) == KM_ENUM_REP);
487 keymaster_key_param_t param;
488 memset(&param, 0, sizeof(param));
489 param.tag = tag;
490 param.enumerated = value;
491 return param;
492}
493
494inline keymaster_key_param_t keymaster_param_int(keymaster_tag_t tag, uint32_t value) {
495 // assert(keymaster_tag_get_type(tag) == KM_INT || keymaster_tag_get_type(tag) == KM_INT_REP);
496 keymaster_key_param_t param;
497 memset(&param, 0, sizeof(param));
498 param.tag = tag;
499 param.integer = value;
500 return param;
501}
502
503inline keymaster_key_param_t keymaster_param_long(keymaster_tag_t tag, uint64_t value) {
504 // assert(keymaster_tag_get_type(tag) == KM_LONG);
505 keymaster_key_param_t param;
506 memset(&param, 0, sizeof(param));
507 param.tag = tag;
508 param.long_integer = value;
509 return param;
510}
511
512inline keymaster_key_param_t keymaster_param_blob(keymaster_tag_t tag, const uint8_t* bytes,
513 size_t bytes_len) {
514 // assert(keymaster_tag_get_type(tag) == KM_BYTES || keymaster_tag_get_type(tag) == KM_BIGNUM);
515 keymaster_key_param_t param;
516 memset(&param, 0, sizeof(param));
517 param.tag = tag;
518 param.blob.data = (uint8_t*)bytes;
519 param.blob.data_length = bytes_len;
520 return param;
521}
522
523inline keymaster_key_param_t keymaster_param_bool(keymaster_tag_t tag) {
524 // assert(keymaster_tag_get_type(tag) == KM_BOOL);
525 keymaster_key_param_t param;
526 memset(&param, 0, sizeof(param));
527 param.tag = tag;
528 param.boolean = true;
529 return param;
530}
531
532inline keymaster_key_param_t keymaster_param_date(keymaster_tag_t tag, uint64_t value) {
533 // assert(keymaster_tag_get_type(tag) == KM_DATE);
534 keymaster_key_param_t param;
535 memset(&param, 0, sizeof(param));
536 param.tag = tag;
537 param.date_time = value;
538 return param;
539}
540
Shawn Willden67411d62015-03-04 10:00:38 -0700541#define KEYMASTER_SIMPLE_COMPARE(a, b) (a < b) ? -1 : ((a > b) ? 1 : 0)
542inline int keymaster_param_compare(const keymaster_key_param_t* a, const keymaster_key_param_t* b) {
Tucker Sylvestro28a872e2016-10-05 14:39:39 -0400543 int retval = KEYMASTER_SIMPLE_COMPARE((uint32_t)a->tag, (uint32_t)b->tag);
Shawn Willden67411d62015-03-04 10:00:38 -0700544 if (retval != 0)
545 return retval;
546
547 switch (keymaster_tag_get_type(a->tag)) {
548 case KM_INVALID:
549 case KM_BOOL:
550 return 0;
551 case KM_ENUM:
552 case KM_ENUM_REP:
553 return KEYMASTER_SIMPLE_COMPARE(a->enumerated, b->enumerated);
Shawn Willdenfe6bcfa2015-06-24 20:59:14 +0000554 case KM_UINT:
555 case KM_UINT_REP:
Shawn Willden67411d62015-03-04 10:00:38 -0700556 return KEYMASTER_SIMPLE_COMPARE(a->integer, b->integer);
Shawn Willdenfe6bcfa2015-06-24 20:59:14 +0000557 case KM_ULONG:
558 case KM_ULONG_REP:
Shawn Willden67411d62015-03-04 10:00:38 -0700559 return KEYMASTER_SIMPLE_COMPARE(a->long_integer, b->long_integer);
560 case KM_DATE:
561 return KEYMASTER_SIMPLE_COMPARE(a->date_time, b->date_time);
562 case KM_BIGNUM:
563 case KM_BYTES:
564 // Handle the empty cases.
565 if (a->blob.data_length != 0 && b->blob.data_length == 0)
566 return -1;
567 if (a->blob.data_length == 0 && b->blob.data_length == 0)
568 return 0;
569 if (a->blob.data_length == 0 && b->blob.data_length > 0)
570 return 1;
571
572 retval = memcmp(a->blob.data, b->blob.data, a->blob.data_length < b->blob.data_length
573 ? a->blob.data_length
574 : b->blob.data_length);
575 if (retval != 0)
576 return retval;
577 else if (a->blob.data_length != b->blob.data_length) {
578 // Equal up to the common length; longer one is larger.
579 if (a->blob.data_length < b->blob.data_length)
580 return -1;
581 if (a->blob.data_length > b->blob.data_length)
582 return 1;
583 };
584 }
585
586 return 0;
587}
588#undef KEYMASTER_SIMPLE_COMPARE
589
Shawn Willden9d645a02014-06-12 13:48:46 -0600590inline void keymaster_free_param_values(keymaster_key_param_t* param, size_t param_count) {
Chad Brubakera3c0ae12015-08-12 12:46:44 -0700591 while (param_count > 0) {
592 param_count--;
Shawn Willden9d645a02014-06-12 13:48:46 -0600593 switch (keymaster_tag_get_type(param->tag)) {
594 case KM_BIGNUM:
595 case KM_BYTES:
596 free((void*)param->blob.data);
597 param->blob.data = NULL;
598 break;
599 default:
600 // NOP
601 break;
602 }
603 ++param;
604 }
605}
606
607inline void keymaster_free_param_set(keymaster_key_param_set_t* set) {
608 if (set) {
609 keymaster_free_param_values(set->params, set->length);
610 free(set->params);
611 set->params = NULL;
Shawn Willdene366efd2016-03-20 09:07:50 -0600612 set->length = 0;
Shawn Willden9d645a02014-06-12 13:48:46 -0600613 }
614}
615
616inline void keymaster_free_characteristics(keymaster_key_characteristics_t* characteristics) {
617 if (characteristics) {
618 keymaster_free_param_set(&characteristics->hw_enforced);
619 keymaster_free_param_set(&characteristics->sw_enforced);
620 }
621}
622
Shawn Willdencf30fe12015-12-21 16:29:10 -0700623inline void keymaster_free_cert_chain(keymaster_cert_chain_t* chain) {
624 if (chain) {
625 for (size_t i = 0; i < chain->entry_count; ++i) {
626 free((uint8_t*)chain->entries[i].data);
627 chain->entries[i].data = NULL;
628 chain->entries[i].data_length = 0;
629 }
630 free(chain->entries);
631 chain->entries = NULL;
632 chain->entry_count = 0;
633 }
634}
635
Shawn Willden7eaa15f2015-06-03 09:03:20 -0600636#ifdef __cplusplus
Shawn Willdenc51d01e2015-03-18 18:59:52 -0600637} // extern "C"
638#endif // __cplusplus
Shawn Willden9d645a02014-06-12 13:48:46 -0600639
640#endif // ANDROID_HARDWARE_KEYMASTER_DEFS_H