63 lines
1.5 KiB
Java
63 lines
1.5 KiB
Java
package org.thoughtcrime.securesms.backup;
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import android.support.annotation.NonNull;
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import android.util.Log;
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import org.greenrobot.eventbus.EventBus;
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import org.whispersystems.libsignal.util.ByteUtil;
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import java.security.MessageDigest;
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import java.security.NoSuchAlgorithmException;
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public abstract class FullBackupBase {
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private static final String TAG = FullBackupBase.class.getSimpleName();
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protected static @NonNull byte[] getBackupKey(@NonNull String passphrase) {
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try {
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EventBus.getDefault().post(new BackupEvent(BackupEvent.Type.PROGRESS, 0));
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MessageDigest digest = MessageDigest.getInstance("SHA-512");
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byte[] input = passphrase.replace(" ", "").getBytes();
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byte[] hash = input;
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long start = System.currentTimeMillis();
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for (int i=0;i<250000;i++) {
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if (i % 1000 == 0) EventBus.getDefault().post(new BackupEvent(BackupEvent.Type.PROGRESS, 0));
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digest.update(hash);
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hash = digest.digest(input);
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}
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Log.w(TAG, "Generated: " + (System.currentTimeMillis()- start));
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return ByteUtil.trim(hash, 32);
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} catch (NoSuchAlgorithmException e) {
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throw new AssertionError(e);
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}
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}
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public static class BackupEvent {
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public enum Type {
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PROGRESS,
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FINISHED
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}
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private final Type type;
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private final int count;
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BackupEvent(Type type, int count) {
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this.type = type;
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this.count = count;
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}
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public Type getType() {
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return type;
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}
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public int getCount() {
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return count;
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}
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}
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}
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