59 lines
2.2 KiB
Java
59 lines
2.2 KiB
Java
/*
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* Copyright (C) 2017 Schürmann & Breitmoser GbR
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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package org.sufficientlysecure.keychain.pgp;
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import android.os.Parcelable;
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import com.google.auto.value.AutoValue;
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import com.google.auto.value.extension.memoized.Memoized;
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import org.bouncycastle.bcpg.S2K;
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/** This is an immutable and parcelable class which stores the full s2k parametrization
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* of an encrypted secret key, i.e. all fields of the {@link S2K} class (type, hash algo,
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* iteration count, iv) plus the encryptionAlgorithm. This class is intended to be used
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* as key in a HashMap for session key caching purposes, and overrides the
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* {@link #hashCode} and {@link #equals} methods in a suitable way.
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*
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* Note that although it is a rather unlikely scenario that secret keys of the same key
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* are encrypted with different ciphers, the encryption algorithm still determines the
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* length of the specific session key and thus needs to be considered for purposes of
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* session key caching.
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*
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* @see org.bouncycastle.bcpg.S2K
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*/
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@AutoValue
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public abstract class ParcelableS2K implements Parcelable {
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abstract int getEncryptionAlgorithm();
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abstract int getS2kType();
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abstract int getS2kHashAlgo();
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abstract long getS2kItCount();
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@SuppressWarnings("mutable")
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abstract byte[] getS2kIV();
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@Memoized
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@Override
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public abstract int hashCode();
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public static ParcelableS2K fromS2K(int encryptionAlgorithm, S2K s2k) {
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return new AutoValue_ParcelableS2K(encryptionAlgorithm,
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s2k.getType(), s2k.getHashAlgorithm(), s2k.getIterationCount(), s2k.getIV());
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}
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}
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