474 lines
17 KiB
Java
474 lines
17 KiB
Java
/*
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* Copyright (C) 2013 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package android.security;
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import android.content.Context;
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import java.security.Key;
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import java.security.KeyPairGenerator;
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import java.security.KeyStore.ProtectionParameter;
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import java.util.Date;
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/**
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* This provides the optional parameters that can be specified for
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* {@code KeyStore} entries that work with
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* <a href="{@docRoot}training/articles/keystore.html">Android KeyStore
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* facility</a>. The Android KeyStore facility is accessed through a
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* {@link java.security.KeyStore} API using the {@code AndroidKeyStore}
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* provider. The {@code context} passed in may be used to pop up some UI to ask
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* the user to unlock or initialize the Android KeyStore facility.
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* <p>
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* Any entries placed in the {@code KeyStore} may be retrieved later. Note that
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* there is only one logical instance of the {@code KeyStore} per application
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* UID so apps using the {@code sharedUid} facility will also share a
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* {@code KeyStore}.
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* <p>
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* Keys may be generated using the {@link KeyPairGenerator} facility with a
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* {@link KeyPairGeneratorSpec} to specify the entry's {@code alias}. A
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* self-signed X.509 certificate will be attached to generated entries, but that
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* may be replaced at a later time by a certificate signed by a real Certificate
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* Authority.
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*/
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public final class KeyStoreParameter implements ProtectionParameter {
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private int mFlags;
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private final Date mKeyValidityStart;
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private final Date mKeyValidityForOriginationEnd;
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private final Date mKeyValidityForConsumptionEnd;
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private final @KeyStoreKeyConstraints.PurposeEnum int mPurposes;
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private final @KeyStoreKeyConstraints.PaddingEnum int mPaddings;
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private final @KeyStoreKeyConstraints.DigestEnum Integer mDigests;
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private final @KeyStoreKeyConstraints.BlockModeEnum int mBlockModes;
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private final @KeyStoreKeyConstraints.UserAuthenticatorEnum int mUserAuthenticators;
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private final int mUserAuthenticationValidityDurationSeconds;
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private final boolean mInvalidatedOnNewFingerprintEnrolled;
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private KeyStoreParameter(int flags,
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Date keyValidityStart,
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Date keyValidityForOriginationEnd,
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Date keyValidityForConsumptionEnd,
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@KeyStoreKeyConstraints.PurposeEnum int purposes,
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@KeyStoreKeyConstraints.PaddingEnum int paddings,
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@KeyStoreKeyConstraints.DigestEnum Integer digests,
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@KeyStoreKeyConstraints.BlockModeEnum int blockModes,
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@KeyStoreKeyConstraints.UserAuthenticatorEnum int userAuthenticators,
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int userAuthenticationValidityDurationSeconds,
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boolean invalidatedOnNewFingerprintEnrolled) {
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if ((userAuthenticationValidityDurationSeconds < 0)
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&& (userAuthenticationValidityDurationSeconds != -1)) {
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throw new IllegalArgumentException(
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"userAuthenticationValidityDurationSeconds must not be negative");
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}
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mFlags = flags;
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mKeyValidityStart = keyValidityStart;
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mKeyValidityForOriginationEnd = keyValidityForOriginationEnd;
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mKeyValidityForConsumptionEnd = keyValidityForConsumptionEnd;
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mPurposes = purposes;
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mPaddings = paddings;
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mDigests = digests;
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mBlockModes = blockModes;
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mUserAuthenticators = userAuthenticators;
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mUserAuthenticationValidityDurationSeconds = userAuthenticationValidityDurationSeconds;
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mInvalidatedOnNewFingerprintEnrolled = invalidatedOnNewFingerprintEnrolled;
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}
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/**
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* @hide
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*/
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public int getFlags() {
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return mFlags;
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}
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/**
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* Returns {@code true} if this parameter requires entries to be encrypted
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* on the disk.
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*/
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public boolean isEncryptionRequired() {
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return (mFlags & KeyStore.FLAG_ENCRYPTED) != 0;
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}
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/**
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* Gets the time instant before which the key is not yet valid.
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*
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* @return instant or {@code null} if not restricted.
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* @hide
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*/
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public Date getKeyValidityStart() {
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return mKeyValidityStart;
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}
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/**
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* Gets the time instant after which the key is no long valid for decryption and verification.
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*
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* @return instant or {@code null} if not restricted.
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*
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* @hide
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*/
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public Date getKeyValidityForConsumptionEnd() {
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return mKeyValidityForConsumptionEnd;
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}
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/**
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* Gets the time instant after which the key is no long valid for encryption and signing.
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*
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* @return instant or {@code null} if not restricted.
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*
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* @hide
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*/
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public Date getKeyValidityForOriginationEnd() {
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return mKeyValidityForOriginationEnd;
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}
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/**
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* Gets the set of purposes for which the key can be used.
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*
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* @hide
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*/
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public @KeyStoreKeyConstraints.PurposeEnum int getPurposes() {
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return mPurposes;
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}
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/**
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* Gets the set of padding schemes to which the key is restricted.
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*
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* @hide
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*/
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public @KeyStoreKeyConstraints.PaddingEnum int getPaddings() {
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return mPaddings;
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}
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/**
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* Gets the set of digests to which the key is restricted.
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*
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* @throws IllegalStateException if this restriction has not been specified.
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*
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* @see #isDigestsSpecified()
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*
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* @hide
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*/
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public @KeyStoreKeyConstraints.DigestEnum int getDigests() {
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if (mDigests == null) {
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throw new IllegalStateException("Digests not specified");
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}
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return mDigests;
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}
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/**
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* Returns {@code true} if digest restrictions have been specified.
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*
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* @see #getDigests()
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*
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* @hide
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*/
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public boolean isDigestsSpecified() {
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return mDigests != null;
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}
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/**
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* Gets the set of block modes to which the key is restricted.
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*
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* @hide
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*/
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public @KeyStoreKeyConstraints.BlockModeEnum int getBlockModes() {
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return mBlockModes;
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}
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/**
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* Gets the set of user authenticators which protect access to this key. The key can only be
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* used iff the user has authenticated to at least one of these user authenticators.
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*
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* @return user authenticators or {@code 0} if the key can be used without user authentication.
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*
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* @hide
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*/
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public @KeyStoreKeyConstraints.UserAuthenticatorEnum int getUserAuthenticators() {
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return mUserAuthenticators;
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}
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/**
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* Gets the duration of time (seconds) for which this key can be used after the user
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* successfully authenticates to one of the associated user authenticators.
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*
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* @return duration in seconds or {@code -1} if not restricted. {@code 0} means authentication
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* is required for every use of the key.
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*
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* @hide
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*/
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public int getUserAuthenticationValidityDurationSeconds() {
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return mUserAuthenticationValidityDurationSeconds;
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}
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/**
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* Returns {@code true} if this key must be permanently invalidated once a new fingerprint is
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* enrolled. This constraint only has effect if fingerprint reader is one of the user
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* authenticators protecting access to this key.
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*
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* @see #getUserAuthenticators()
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*
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* @hide
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*/
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public boolean isInvalidatedOnNewFingerprintEnrolled() {
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return mInvalidatedOnNewFingerprintEnrolled;
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}
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/**
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* Builder class for {@link KeyStoreParameter} objects.
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* <p>
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* This will build protection parameters for use with the
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* <a href="{@docRoot}training/articles/keystore.html">Android KeyStore
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* facility</a>.
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* <p>
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* This can be used to require that KeyStore entries be stored encrypted.
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* <p>
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* Example:
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*
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* <pre class="prettyprint">
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* KeyStoreParameter params = new KeyStoreParameter.Builder(mContext)
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* .setEncryptionRequired()
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* .build();
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* </pre>
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*/
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public final static class Builder {
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private int mFlags;
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private Date mKeyValidityStart;
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private Date mKeyValidityForOriginationEnd;
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private Date mKeyValidityForConsumptionEnd;
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private @KeyStoreKeyConstraints.PurposeEnum int mPurposes;
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private @KeyStoreKeyConstraints.PaddingEnum int mPaddings;
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private @KeyStoreKeyConstraints.DigestEnum Integer mDigests;
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private @KeyStoreKeyConstraints.BlockModeEnum int mBlockModes;
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private @KeyStoreKeyConstraints.UserAuthenticatorEnum int mUserAuthenticators;
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private int mUserAuthenticationValidityDurationSeconds = -1;
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private boolean mInvalidatedOnNewFingerprintEnrolled;
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/**
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* Creates a new instance of the {@code Builder} with the given
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* {@code context}. The {@code context} passed in may be used to pop up
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* some UI to ask the user to unlock or initialize the Android KeyStore
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* facility.
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*/
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public Builder(Context context) {
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if (context == null) {
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throw new NullPointerException("context == null");
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}
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// Context is currently not used, but will be in the future.
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}
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/**
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* Indicates that this key must be encrypted at rest on storage. Note
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* that enabling this will require that the user enable a strong lock
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* screen (e.g., PIN, password) before creating or using the generated
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* key is successful.
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*/
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public Builder setEncryptionRequired(boolean required) {
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if (required) {
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mFlags |= KeyStore.FLAG_ENCRYPTED;
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} else {
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mFlags &= ~KeyStore.FLAG_ENCRYPTED;
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}
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return this;
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}
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/**
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* Sets the time instant before which the key is not yet valid.
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*
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* <b>By default, the key is valid at any instant.
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*
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* @see #setKeyValidityEnd(Date)
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*
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* @hide
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*/
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public Builder setKeyValidityStart(Date startDate) {
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mKeyValidityStart = startDate;
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return this;
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}
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/**
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* Sets the time instant after which the key is no longer valid.
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*
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* <b>By default, the key is valid at any instant.
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*
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* @see #setKeyValidityStart(Date)
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* @see #setKeyValidityForConsumptionEnd(Date)
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* @see #setKeyValidityForOriginationEnd(Date)
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*
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* @hide
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*/
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public Builder setKeyValidityEnd(Date endDate) {
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setKeyValidityForOriginationEnd(endDate);
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setKeyValidityForConsumptionEnd(endDate);
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return this;
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}
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/**
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* Sets the time instant after which the key is no longer valid for encryption and signing.
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*
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* <b>By default, the key is valid at any instant.
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*
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* @see #setKeyValidityForConsumptionEnd(Date)
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*
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* @hide
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*/
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public Builder setKeyValidityForOriginationEnd(Date endDate) {
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mKeyValidityForOriginationEnd = endDate;
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return this;
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}
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/**
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* Sets the time instant after which the key is no longer valid for decryption and
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* verification.
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*
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* <b>By default, the key is valid at any instant.
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*
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* @see #setKeyValidityForOriginationEnd(Date)
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*
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* @hide
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*/
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public Builder setKeyValidityForConsumptionEnd(Date endDate) {
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mKeyValidityForConsumptionEnd = endDate;
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return this;
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}
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/**
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* Restricts the key to being used only for the provided set of purposes.
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*
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* <p>This restriction must be specified. There is no default.
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*
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* @hide
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*/
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public Builder setPurposes(@KeyStoreKeyConstraints.PurposeEnum int purposes) {
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mPurposes = purposes;
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return this;
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}
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/**
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* Restricts the key to being used only with the provided padding schemes. Attempts to use
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* the key with any other padding will be rejected.
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*
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* <p>This restriction must be specified for keys which are used for encryption/decryption.
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*
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* @hide
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*/
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public Builder setPaddings(@KeyStoreKeyConstraints.PaddingEnum int paddings) {
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mPaddings = paddings;
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return this;
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}
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/**
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* Restricts the key to being used only with the provided digests when generating signatures
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* or HMACs. Attempts to use the key with any other digest will be rejected.
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*
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* <p>For HMAC keys, the default is to restrict to the digest specified in
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* {@link Key#getAlgorithm()}. For asymmetric signing keys this constraint must be specified
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* because there is no default.
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*
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* @hide
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*/
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public Builder setDigests(@KeyStoreKeyConstraints.DigestEnum int digests) {
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mDigests = digests;
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return this;
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}
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/**
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* Restricts the key to being used only with the provided block modes. Attempts to use the
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* key with any other block modes will be rejected.
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*
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* <p>This restriction must be specified for symmetric encryption/decryption keys.
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*
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* @hide
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*/
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public Builder setBlockModes(@KeyStoreKeyConstraints.BlockModeEnum int blockModes) {
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mBlockModes = blockModes;
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return this;
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}
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/**
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* Sets the user authenticators which protect access to this key. The key can only be used
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* iff the user has authenticated to at least one of these user authenticators.
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*
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* <p>By default, the key can be used without user authentication.
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*
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* @param userAuthenticators user authenticators or {@code 0} if this key can be accessed
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* without user authentication.
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*
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* @see #setUserAuthenticationValidityDurationSeconds(int)
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*
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* @hide
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*/
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public Builder setUserAuthenticators(
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@KeyStoreKeyConstraints.UserAuthenticatorEnum int userAuthenticators) {
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mUserAuthenticators = userAuthenticators;
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return this;
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}
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/**
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* Sets the duration of time (seconds) for which this key can be used after the user
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* successfully authenticates to one of the associated user authenticators.
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*
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* <p>By default, the user needs to authenticate for every use of the key.
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*
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* @param seconds duration in seconds or {@code 0} if the user needs to authenticate for
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* every use of the key.
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*
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* @see #setUserAuthenticators(int)
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*
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* @hide
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*/
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public Builder setUserAuthenticationValidityDurationSeconds(int seconds) {
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mUserAuthenticationValidityDurationSeconds = seconds;
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return this;
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}
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/**
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* Sets whether this key must be invalidated (permanently) whenever a new fingerprint is
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* enrolled. This only has effect if fingerprint reader is one of the user authenticators
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* protecting access to the key.
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*
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* <p>By default, enrolling a new fingerprint does not invalidate the key.
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*
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* @see #setUserAuthenticators(Set)
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*
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* @hide
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*/
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public Builder setInvalidatedOnNewFingerprintEnrolled(boolean invalidated) {
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mInvalidatedOnNewFingerprintEnrolled = invalidated;
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return this;
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}
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/**
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* Builds the instance of the {@code KeyStoreParameter}.
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*
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* @throws IllegalArgumentException if a required field is missing
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* @return built instance of {@code KeyStoreParameter}
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*/
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public KeyStoreParameter build() {
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return new KeyStoreParameter(mFlags,
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mKeyValidityStart,
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mKeyValidityForOriginationEnd,
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mKeyValidityForConsumptionEnd,
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mPurposes,
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mPaddings,
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mDigests,
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mBlockModes,
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mUserAuthenticators,
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mUserAuthenticationValidityDurationSeconds,
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mInvalidatedOnNewFingerprintEnrolled);
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}
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}
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}
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