1 /* 2 * Copyright 2021, 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 package android.security.metrics; 18 19 /** 20 * Purpose enum as defined in Keystore2KeyOperationWithPurposeAndModesInfo of 21 * frameworks/proto_logging/stats/atoms.proto. 22 * @hide 23 */ 24 @Backing(type="int") 25 enum Purpose { 26 /** Unspecified takes 0. Other values are incremented by 1 compared to keymint spec. */ 27 KEY_PURPOSE_UNSPECIFIED = 0, 28 29 /** Usable with RSA, 3DES and AES keys. */ 30 ENCRYPT = 1, 31 32 /** Usable with RSA, 3DES and AES keys. */ 33 DECRYPT = 2, 34 35 /** Usable with RSA, EC and HMAC keys. */ 36 SIGN = 3, 37 38 /** Usable with RSA, EC and HMAC keys. */ 39 VERIFY = 4, 40 41 /** 4 is reserved */ 42 43 /** Usable with RSA keys. */ 44 WRAP_KEY = 6, 45 46 /** Key Agreement, usable with EC keys. */ 47 AGREE_KEY = 7, 48 49 /** 50 * Usable as an attestation signing key. Keys with this purpose must not have any other 51 * purpose. 52 */ 53 ATTEST_KEY = 8, 54 }