am 304b01c2: Merge "Document what algorithms Android Keystore supports." into mnc-dev (155d41a0) · Commits · e / os / android_frameworks_base

docs/html/training/articles/keystore.jd

+464 −3

Original line number	Diff line number	Diff line
		@@ -7,14 +7,15 @@ page.title=Android Keystore System
		<ol>
		<li><a href="#SecurityFeatures">Security Features</a></li>
		<li><a href="#WhichShouldIUse">Choosing Between a Keychain or the Android Keystore Provider</a></li>
		<li><a href="#UsingAndroidKeyStore">Using Android Keystore Provider
		</a></li>
		<li><a href="#UsingAndroidKeyStore">Using Android Keystore Provider</a>
		<ol>
		<li><a href="#GeneratingANewPrivateKey">Generating a New Private Key</a></li>
		<li><a href="#WorkingWithKeyStoreEntries">Working with Keystore Entries</a></li>
		<li><a href="#ListingEntries">Listing Entries</a></li>
		<li><a href="#SigningAndVerifyingData">Signing and Verifying Data</a></li>
		</ol>
		</li>
		<li><a href="#SupportedAlgorithms">Supported Algorithms</a></li>
		</ol>

		<h2>Blog articles</h2>
		@@ -27,6 +28,14 @@ page.title=Android Keystore System
		</div>
		</div>

		<style type="text/css">
		tr.deprecated {
		background-color: #ccc;
		color: #999;
		font-style: italic;
		}
		</style>

		<p>The Android Keystore system lets you store cryptographic keys in a container
		to make it more difficult to extract from the device. Once keys are in the
		keystore, they can be used for cryptographic operations with the key material
		@@ -214,3 +223,455 @@ operate in one of the two modes:
		These keys become permanently invalidated once a new fingerprint is enrolled or all fingerprints
		are unenrolled.</li>
		</ul>

		<h2 id="SupportedAlgorithms">Supported Algorithms</h2>

		<ul>
		<li><a href="#SupportedCiphers">{@code Cipher}</a></li>
		<li><a href="#SupportedKeyGenerators">{@code KeyGenerator}</a></li>
		<li><a href="#SupportedKeyFactories">{@code KeyFactory}</a></li>
		<li><a href="#SupportedKeyPairGenerators">{@code KeyPairGenerator}</a></li>
		<li><a href="#SupportedMacs">{@code Mac}</a></li>
		<li><a href="#SupportedSignatures">{@code Signature}</a></li>
		<li><a href="#SupportedSecretKeyFactories">{@code SecretKeyFactory}</a></li>
		</ul>

		<h3 id="SupportedCiphers">Cipher</h3>
		<table>
		<thead>
		<tr>
		<th>Algorithm</th>
		<th>Supported (API Levels)</th>
		<th>Notes</th>
		</tr>
		</thead>
		<tbody>
		<tr>
		<td>AES/CBC/NoPadding</td>
		<td>23+</td>
		<td></td>
		</tr>
		<tr>
		<td>AES/CBC/PKCS7Padding</td>
		<td>23+</td>
		<td></td>
		</tr>
		<tr>
		<td>AES/CTR/NoPadding</td>
		<td>23+</td>
		<td></td>
		</tr>
		<tr>
		<td>AES/ECB/NoPadding</td>
		<td>23+</td>
		<td></td>
		</tr>
		<tr>
		<td>AES/ECB/PKCS7Padding</td>
		<td>23+</td>
		<td></td>
		</tr>
		<tr>
		<td>AES/GCM/NoPadding</td>
		<td>23+</td>
		<td>Only 12-byte long IVs supported.</td>
		</tr>
		<tr>
		<td>RSA/ECB/NoPadding</td>
		<td>18+</td>
		<td></td>
		</tr>
		<tr>
		<td>RSA/ECB/PKCS1Padding</td>
		<td>18+</td>
		<td></td>
		</tr>
		<tr>
		<td>RSA/ECB/OAEPWithSHA-1AndMGF1Padding</td>
		<td>23+</td>
		<td></td>
		</tr>
		<tr>
		<td>RSA/ECB/OAEPWithSHA-224AndMGF1Padding</td>
		<td>23+</td>
		<td></td>
		</tr>
		<tr>
		<td>RSA/ECB/OAEPWithSHA-256AndMGF1Padding</td>
		<td>23+</td>
		<td></td>
		</tr>
		<tr>
		<td>RSA/ECB/OAEPWithSHA-384AndMGF1Padding</td>
		<td>23+</td>
		<td></td>
		</tr>
		<tr>
		<td>RSA/ECB/OAEPWithSHA-512AndMGF1Padding</td>
		<td>23+</td>
		<td></td>
		</tr>
		<tr>
		<td>RSA/ECB/OAEPPadding</td>
		<td>23+</td>
		<td></td>
		</tr>
		</tbody>
		</table>

		<h3 id="SupportedKeyGenerators">KeyGenerator</h3>
		<table>
		<thead>
		<tr>
		<th>Algorithm</th>
		<th>Supported (API Levels)</th>
		<th>Notes</th>
		</tr>
		</thead>
		<tbody>
		<tr>
		<td>AES</td>
		<td>23+</td>
		<td>Supported sizes: 128, 192, 256</td>
		</tr>
		<tr>
		<td>HmacSHA1</td>
		<td>23+</td>
		<td>
		<ul>
		<li>Supported sizes: 8--1024 (inclusive), must be multiple of 8</li>
		<li>Default size: 160</li>
		<ul>
		</td>
		</tr>
		<tr>
		<td>HmacSHA224</td>
		<td>23+</td>
		<td>
		<ul>
		<li>Supported sizes: 8--1024 (inclusive), must be multiple of 8</li>
		<li>Default size: 224</li>
		<ul>
		</td>
		</tr>
		<tr>
		<td>HmacSHA256</td>
		<td>23+</td>
		<td>
		<ul>
		<li>Supported sizes: 8--1024 (inclusive), must be multiple of 8</li>
		<li>Default size: 256</li>
		<ul>
		</td>
		</tr>
		<tr>
		<td>HmacSHA384</td>
		<td>23+</td>
		<td>
		<ul>
		<li>Supported sizes: 8--1024 (inclusive), must be multiple of 8</li>
		<li>Default size: 384</li>
		<ul>
		</td>
		</tr>
		<tr>
		<td>HmacSHA512</td>
		<td>23+</td>
		<td>
		<ul>
		<li>Supported sizes: 8--1024 (inclusive), must be multiple of 8</li>
		<li>Default size: 512</li>
		<ul>
		</td>
		</tr>
		</tbody>
		</table>

		<h3 id="SupportedKeyFactories">KeyFactory</h3>
		<table>
		<thead>
		<tr>
		<th>Algorithm</th>
		<th>Supported (API Levels)</th>
		<th>Notes</th>
		</tr>
		</thead>
		<tbody>
		<tr>
		<td>EC</td>
		<td>23+</td>
		<td>Supported key specs: {@link android.security.keystore.KeyInfo} (private key only),
		{@link java.security.spec.ECPublicKeySpec} (public key only),
		{@link java.security.spec.X509EncodedKeySpec} (public key only)
		</td>
		</tr>
		<tr>
		<td>RSA</td>
		<td>23+</td>
		<td>Supported key specs: {@link android.security.keystore.KeyInfo} (private key only),
		{@link java.security.spec.RSAPublicKeySpec} (public key only),
		{@link java.security.spec.X509EncodedKeySpec} (public key only)
		</td>
		</tr>
		</tbody>
		</table>

		<h3 id="SupportedKeyStoreKeys">KeyStore</h3>
		KeyStore supports the same key types as
		<a href="#SupportedKeyPairGenerators">{@code KeyPairGenerator}</a> and
		<a href="#SupportedKeyGenerators">{@code KeyGenerator}</a>.

		<h3 id="SupportedKeyPairGenerators">KeyPairGenerator</h3>
		<table>
		<thead>
		<tr>
		<th>Algorithm</th>
		<th>Supported (API Levels)</th>
		<th>Notes</th>
		</tr>
		</thead>
		<tbody>
		<tr class="deprecated">
		<td>DSA</td>
		<td>19–22</td>
		<td></td>
		</tr>
		<tr>
		<td>EC</td>
		<td>23+</td>
		<td>
		<ul>
		<li>Supported sizes: 224, 256, 384, 521</li>
		<li>Supported named curves: P-224 (secp256r1), P-256 (aka secp256r1 and prime256v1), P-384
		(aka secp384r1), P-521 (aka secp521r1)</li>
		</ul>

		<p>Prior to API Level 23, EC keys can be generated using KeyPairGenerator of algorithm "RSA"
		initialized {@link android.security.KeyPairGeneratorSpec} whose key type is set to "EC"
		using {@link android.security.KeyPairGeneratorSpec.Builder#setKeyType(String)}. EC curve
		name cannot be specified using this method -- a NIST P-curve is automatically chosen based
		on the requested key size.
		</td>
		</tr>
		<tr>
		<td>RSA</td>
		<td>18+</td>
		<td>
		<ul>
		<li>Supported sizes: 512, 768, 1024, 2048, 3072, 4096</li>
		<li>Supported public exponents: 3, 65537</li>
		<li>Default public exponent: 65537</li>
		</ul>
		</td>
		</tr>
		</tbody>
		</table>

		<h3 id="SupportedMacs">Mac</h3>
		<table>
		<thead>
		<tr>
		<th>Algorithm</th>
		<th>Supported (API Levels)</th>
		<th>Notes</th>
		</tr>
		</thead>
		<tbody>
		<tr>
		<td>HmacSHA1</td>
		<td>23+</td>
		<td></td>
		</tr>
		<tr>
		<td>HmacSHA224</td>
		<td>23+</td>
		<td></td>
		</tr>
		<tr>
		<td>HmacSHA256</td>
		<td>23+</td>
		<td></td>
		</tr>
		<tr>
		<td>HmacSHA384</td>
		<td>23+</td>
		<td></td>
		</tr>
		<tr>
		<td>HmacSHA512</td>
		<td>23+</td>
		<td></td>
		</tr>
		</tbody>
		</table>

		<h3 id="SupportedSignatures">Signature</h3>
		<table>
		<thead>
		<tr>
		<th>Algorithm</th>
		<th>Supported (API Levels)</th>
		<th>Notes</th>
		</tr>
		</thead>
		<tbody>
		<tr>
		<td>MD5withRSA</td>
		<td>18+</td>
		<td></td>
		</tr>
		<tr>
		<td>NONEwithECDSA</td>
		<td>23+</td>
		<td></td>
		</tr>
		<tr>
		<td>NONEwithRSA</td>
		<td>18+</td>
		<td></td>
		</tr>
		<tr class="deprecated">
		<td>SHA1withDSA</td>
		<td>19–22</td>
		<td></td>
		</tr>
		<tr>
		<td>SHA1withECDSA</td>
		<td>19+</td>
		<td></td>
		</tr>
		<tr>
		<td>SHA1withRSA</td>
		<td>18+</td>
		<td></td>
		</tr>
		<tr>
		<td>SHA1withRSA/PSS</td>
		<td>23+</td>
		<td></td>
		</tr>
		<tr class="deprecated">
		<td>SHA224withDSA</td>
		<td>20–22</td>
		<td></td>
		</tr>
		<tr>
		<td>SHA224withECDSA</td>
		<td>20+</td>
		<td></td>
		</tr>
		<tr>
		<td>SHA224withRSA</td>
		<td>20+</td>
		<td></td>
		</tr>
		<tr>
		<td>SHA224withRSA/PSS</td>
		<td>23+</td>
		<td></td>
		</tr>
		<tr class="deprecated">
		<td>SHA256withDSA</td>
		<td>19–22</td>
		<td></td>
		</tr>
		<tr>
		<td>SHA256withECDSA</td>
		<td>19+</td>
		<td></td>
		</tr>
		<tr>
		<td>SHA256withRSA</td>
		<td>18+</td>
		<td></td>
		</tr>
		<tr>
		<td>SHA256withRSA/PSS</td>
		<td>23+</td>
		<td></td>
		</tr>
		<tr class="deprecated">
		<td>SHA384withDSA</td>
		<td>19–22</td>
		<td></td>
		</tr>
		<tr>
		<td>SHA384withECDSA</td>
		<td>19+</td>
		<td></td>
		</tr>
		<tr>
		<td>SHA384withRSA</td>
		<td>18+</td>
		<td></td>
		</tr>
		<tr>
		<td>SHA384withRSA/PSS</td>
		<td>23+</td>
		<td></td>
		</tr>
		<tr class="deprecated">
		<td>SHA512withDSA</td>
		<td>19–22</td>
		<td></td>
		</tr>
		<tr>
		<td>SHA512withECDSA</td>
		<td>19+</td>
		<td></td>
		</tr>
		<tr>
		<td>SHA512withRSA</td>
		<td>18+</td>
		<td></td>
		</tr>
		<tr>
		<td>SHA512withRSA/PSS</td>
		<td>23+</td>
		<td></td>
		</tr>
		</tbody>
		</table>

		<h3 id="SupportedSecretKeyFactories">SecretKeyFactory</h3>
		<table>
		<thead>
		<tr>
		<th>Algorithm</th>
		<th>Supported (API Levels)</th>
		<th>Notes</th>
		</tr>
		</thead>
		<tbody>
		<tr>
		<td>AES</td>
		<td>23+</td>
		<td>Supported key specs: {@link android.security.keystore.KeyInfo}</td>
		</tr>
		<tr>
		<td>HmacSHA1</td>
		<td>23+</td>
		<td>Supported key specs: {@link android.security.keystore.KeyInfo}</td>
		</tr>
		<tr>
		<td>HmacSHA224</td>
		<td>23+</td>
		<td>Supported key specs: {@link android.security.keystore.KeyInfo}</td>
		</tr>
		<tr>
		<td>HmacSHA256</td>
		<td>23+</td>
		<td>Supported key specs: {@link android.security.keystore.KeyInfo}</td>
		</tr>
		<tr>
		<td>HmacSHA384</td>
		<td>23+</td>
		<td>Supported key specs: {@link android.security.keystore.KeyInfo}</td>
		</tr>
		<tr>
		<td>HmacSHA512</td>
		<td>23+</td>
		<td>Supported key specs: {@link android.security.keystore.KeyInfo}</td>
		</tr>
		</tbody>
		</table>
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