kopia lustrzana https://github.com/ryukoposting/Signal-Android
57 wiersze
2.1 KiB
Java
57 wiersze
2.1 KiB
Java
package org.thoughtcrime.securesms.backup;
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import android.content.Context;
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import android.os.Build;
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import androidx.annotation.NonNull;
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import androidx.annotation.Nullable;
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import org.signal.core.util.logging.Log;
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import org.thoughtcrime.securesms.crypto.KeyStoreHelper;
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import org.thoughtcrime.securesms.util.TextSecurePreferences;
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/**
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* Allows the getting and setting of the backup passphrase, which is stored encrypted on API >= 23.
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*/
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public final class BackupPassphrase {
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private BackupPassphrase() {
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}
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private static final String TAG = Log.tag(BackupPassphrase.class);
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public static @Nullable String get(@NonNull Context context) {
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String passphrase = TextSecurePreferences.getBackupPassphrase(context);
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String encryptedPassphrase = TextSecurePreferences.getEncryptedBackupPassphrase(context);
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if (Build.VERSION.SDK_INT < 23 || (passphrase == null && encryptedPassphrase == null)) {
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return stripSpaces(passphrase);
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}
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if (encryptedPassphrase == null) {
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Log.i(TAG, "Migrating to encrypted passphrase.");
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set(context, passphrase);
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encryptedPassphrase = TextSecurePreferences.getEncryptedBackupPassphrase(context);
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if (encryptedPassphrase == null) throw new AssertionError("Passphrase migration failed");
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}
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KeyStoreHelper.SealedData data = KeyStoreHelper.SealedData.fromString(encryptedPassphrase);
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return stripSpaces(new String(KeyStoreHelper.unseal(data)));
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}
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public static void set(@NonNull Context context, @Nullable String passphrase) {
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if (passphrase == null || Build.VERSION.SDK_INT < 23) {
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TextSecurePreferences.setBackupPassphrase(context, passphrase);
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TextSecurePreferences.setEncryptedBackupPassphrase(context, null);
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} else {
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KeyStoreHelper.SealedData encryptedPassphrase = KeyStoreHelper.seal(passphrase.getBytes());
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TextSecurePreferences.setEncryptedBackupPassphrase(context, encryptedPassphrase.serialize());
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TextSecurePreferences.setBackupPassphrase(context, null);
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}
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}
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private static String stripSpaces(@Nullable String passphrase) {
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return passphrase != null ? passphrase.replace(" ", "") : null;
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}
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}
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