1 <html devsite><head> 2 <title></title> 3 <meta name="project_path" value="/_project.yaml"/> 4 <meta name="book_path" value="/_book.yaml"/> 5 </head> 6 <body> 7 <!-- 8 Copyright 2017 The Android Open Source Project 9 10 Licensed under the Apache License, Version 2.0 (the "License"); 11 you may not use this file except in compliance with the License. 12 You may obtain a copy of the License at 13 14 http://www.apache.org/licenses/LICENSE-2.0 15 16 Unless required by applicable law or agreed to in writing, software 17 distributed under the License is distributed on an "AS IS" BASIS, 18 WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 19 See the License for the specific language governing permissions and 20 limitations under the License. 21 --> 22 23 <p> Android 6.0 <a href="index.html">Keystore</a> </p> 24 25 <h2 id="cryptographic_primitives"></h2> 26 27 <p>Keystore </p> 28 29 <ul> 30 <li></li><li></li><li></li><li></li><li></li><li> AEAD </li><li></li></ul> 31 32 <p><a href="#key_access_control"></a></p> 33 34 <p>Keymaster API (IV)</p> 35 36 <h2 id="required_primitives"></h2> 37 38 <p></p> 39 40 <ul> 41 <li><a href="http://en.wikipedia.org/wiki/RSA_(cryptosystem)">RSA</a> 42 <ul> 43 <li> 2048 3072 4096 </li><li> F4 (2^16+1)</li><li> RSA <ul> 44 <li></li><li>RSASSA-PSS (<code>KM_PAD_RSA_PSS</code>)</li><li>RSASSA-PKCS1-v1_5 (<code>KM_PAD_RSA_PKCS1_1_5_SIGN</code>)</li></ul> 45 </li><li> RSA <ul> 46 <li></li><li>SHA-256</li></ul> 47 </li><li> RSA /<ul> 48 <li></li><li>RSAES-OAEP (<code>KM_PAD_RSA_OAEP</code>)</li><li>RSAES-PKCS1-v1_5 (<code>KM_PAD_RSA_PKCS1_1_5_ENCRYPT</code>)</li></ul> 49 </li></ul> 50 </li><li><a href="http://en.wikipedia.org/wiki/Elliptic_Curve_DSA">ECDSA</a> 51 <ul> 52 <li> 224 256 384 521 NIST P-224P-256P-384 P-521 </li><li> ECDSA<ul> 53 <li></li><li>SHA-256</li></ul> 54 </li></ul> 55 </li><li><a href="http://en.wikipedia.org/wiki/Advanced_Encryption_Standard">AES</a> 56 <ul> 57 <li> 128 256 </li><li><a href="http://en.wikipedia.org/wiki/Block_cipher_mode_of_operation#Cipher-block_chaining_.28CBC.29">CBC</a>CTRECB GCMGCM 96 96 58 </li><li> CBC ECB <code>KM_PAD_NONE</code> <code>KM_PAD_PKCS7</code>CBC ECB 59 </li></ul> 60 </li><li><a href="http://en.wikipedia.org/wiki/Hash-based_message_authentication_code">HMAC</a> <a href="http://en.wikipedia.org/wiki/SHA-2">SHA-256</a> 32 61 </li></ul> 62 63 <p> SHA1 SHA2 SHA-224SHA384 SHA512 Keymaster Keystore </p> 64 65 <p></p> 66 67 <ul> 68 <li> RSA </li><li> RSA </li></ul> 69 70 <h2 id="key_access_control"></h2> 71 72 <p><em></em>Keystore </p> 73 74 <p>/ 32 Keymaster Keystore Blob </p> 75 76 <p> <code>keymaster_authorization_tag_t</code> <code>KM_TAG_</code> ID </p> 77 78 <p></p> 79 80 <p><strong><code>KM_ENUM</code></strong><code>KM_TAG_PURPOSE</code> <code>keymaster_purpose_t</code> </p> 81 82 <p><strong><code>KM_ENUM_REP</code></strong> <code>KM_ENUM</code> <code>KM_PURPOSE_ENCRYPT</code> <code>KM_PURPOSE_DECRYPT</code></p> 83 84 <p><strong><code>KM_UINT</code></strong>32 <code>KM_TAG_KEY_SIZE</code></p> 85 86 <p><strong><code>KM_UINT_REP</code></strong> <code>KM_UINT</code> </p> 87 88 <p><strong><code>KM_ULONG</code></strong>64 <code>KM_TAG_RSA_PUBLIC_EXPONENT</code></p> 89 90 <p><strong><code>KM_ULONG_REP</code></strong> <code>KM_ULONG</code> </p> 91 92 <p><strong><code>KM_DATE</code></strong>/ 1970 1 1 <code>KM_TAG_PRIVKEY_EXPIRE_DATETIME</code></p> 93 94 <p><strong><code>KM_BOOL</code></strong>True False <code>KM_BOOL</code> falsetrue<code>KM_TAG_ROLLBACK_RESISTANT</code></p> 95 96 <p><strong><code>KM_BIGNUM</code></strong><code>KM_TAG_RSA_PUBLIC_EXPONENT</code></p> 97 98 <p><strong><code>KM_BYTES</code></strong><code>KM_TAG_ROOT_OF_TRUST</code></p> 99 100 <h3 id="hardware_vs_software_enforcement"></h3> 101 102 <p>Keymaster 1.0 </p> 103 104 <p></p> 105 106 <ul> 107 108 <li> Blob 109 110 </li><li> 111 112 </li></ul> 113 114 <p> API <code>keymaster_key_characteristics_t</code> <code>hw_enforced</code> <code>sw_enforced</code></p> 115 116 <p>Keystore <em></em></p> 117 118 <p> TrustZone <code>KM_TAG_ORIGINATION_EXPIRE_DATETIME</code> Keystore <code>sw_enforced</code> Keystore </p> 119 120 <p> <code>hw_enforced</code> <code>KM_TAG_ORIGINATION_EXPIRE_DATETIME</code> Keystore</p> 121 122 <h3 id="cryptographic_message_construction_authorizations"></h3> 123 124 <p><code>KM_TAG_ALGORITHM</code><code>KM_TAG_KEY_SIZE</code><code>KM_TAG_BLOCK_MODE</code><code>KM_TAG_PADDING</code><code>KM_TAG_CALLER_NONCE</code> <code>KM_TAG_DIGEST</code></p> 125 126 <p><code>KM_TAG_PADDING</code><code>KM_TAG_DIGEST</code> <code>KM_PAD_BLOCK_MODE</code> </p> 127 128 <h3 id="purpose"></h3> 129 130 <p> <code>KM_TAG_PURPOSE</code> </p> 131 132 <ul> 133 <li><code>KM_PURPOSE_ENCRYPT</code> 134 </li><li><code>KM_PURPOSE_DECRYPT</code> 135 </li><li><code>KM_PURPOSE_SIGN</code> 136 </li><li><code>KM_PURPOSE_VERIFY</code> 137 </li></ul> 138 139 <p> RSA </p> 140 141 <h3 id="import_and_export"></h3> 142 143 <p>Keymaster X.509 </p> 144 145 <ul> 146 <li> DER PKCS#8 </li><li></li></ul> 147 148 <p> <code>KM_TAG_ORIGIN</code><code>hw_enforced</code> <code>KM_ORIGIN_GENERATED</code> <code>KM_TAG_ORIGIN</code> <code>KM_ORIGIN_IMPORTED</code></p> 149 150 <h3 id="user_authentication"></h3> 151 152 <p> Keymaster Gatekeeper </p> 153 154 <p></p> 155 156 <ul> 157 <li><code>KM_TAG_ALL_USERS</code> <code>KM_TAG_USER_ID</code> <code>KM_TAG_SECURE_USER_ID</code> 158 </li><li><code>KM_TAG_USER_ID</code> ID Android ID UID <code>KM_TAG_ALL_USERS</code> 159 </li><li><code>KM_TAG_SECURE_USER_ID</code> 64 ID ID 160 </li></ul> 161 162 <p> <code>KM_TAG_SECURE_USER_ID</code></p> 163 164 <ul> 165 <li><code>KM_NO_AUTHENTICATION_REQUIRED</code> <code>KM_TAG_USER_ID</code> </li><li><code>KM_TAG_AUTH_TIMEOUT</code> /2^32 136 Android 166 </li></ul> 167 168 <h3 id="client_binding"></h3> 169 170 <p> ID <code>KM_TAG_APPLICATION_ID</code> <code>KM_TAG_APPLICATION_DATA</code>Keystore Blob/ Blob Keymaster </p> 171 172 <p> 173 174 </p><h3 id="expiration"></h3> 175 176 <p>Keystore /Keymaster <code>KM_TAG_ACTIVE_DATETIME</code><code>KM_TAG_ORIGINATION_EXPIRE_DATETIME</code> <code>KM_TAG_USAGE_EXPIRE_DATETIME</code> ORIGINATIONUSAGE////</p> 177 178 <p><code>KM_TAG_ACTIVE_DATETIME</code><code>KM_TAG_ORIGINATION_EXPIRE_DATETIME</code> <code>KM_TAG_USAGE_EXPIRE_DATETIME</code> /</p> 179 180 <p></p> 181 182 <h3 id="root_of_trust_binding"></h3> 183 184 <p>Keystore Keymaster Keymaster </p> 185 186 <p> Keymaster Keymaster </p> 187 188 <h3 id="standalone_keys"></h3> 189 190 <p> Keymaster Keymaster 1.0 HAL <code>KM_TAG_STANDALONE</code> Blob Keymaster </p> 191 192 <ul> 193 <li><code>KM_BLOB_STANDALONE</code> 194 </li><li><code>KM_BLOB_REQUIRES_FILE_SYSTEM</code> 195 </li></ul> 196 197 <p> 198 199 </p><h3 id="velocity"></h3> 200 201 <p> <code>KM_TAG_MIN_SECONDS_BETWEEN_OPS</code> <code>KM_TAG_MIN_SECONDS_BETWEEN_OPS</code> TrustZone </p> 202 203 <p> ID 16 </p> 204 205 <p> <code>KM_TAG_MAX_USES_PER_BOOT</code> n <em></em> 4 Keystore </p> 206 207 <p></p> 208 209 <h3 id="random_number_generator_re-seeding"></h3> 210 211 <p> (IV) Keymaster HAL </p> 212 213 <p> API </p> 214 215 <p> Java SecureRandom 216 217 </p></body></html>
