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Kotlin conversion: Passphrase
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2 changed files with 105 additions and 168 deletions
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// SPDX-FileCopyrightText: 2018 Paul Schaub <vanitasvitae@fsfe.org>
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//
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// SPDX-License-Identifier: Apache-2.0
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package org.pgpainless.util;
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import javax.annotation.Nonnull;
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import javax.annotation.Nullable;
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import java.util.Arrays;
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public class Passphrase {
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public final Object lock = new Object();
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private final char[] chars;
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private boolean valid = true;
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/**
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* Passphrase for keys etc.
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*
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* @param chars may be null for empty passwords.
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*/
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public Passphrase(@Nullable char[] chars) {
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if (chars == null) {
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this.chars = null;
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} else {
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char[] trimmed = removeTrailingAndLeadingWhitespace(chars);
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if (trimmed.length == 0) {
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this.chars = null;
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} else {
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this.chars = trimmed;
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}
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}
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}
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/**
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* Return a copy of the passed in char array, with leading and trailing whitespace characters removed.
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*
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* @param chars char array
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* @return copy of char array with leading and trailing whitespace characters removed
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*/
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private static char[] removeTrailingAndLeadingWhitespace(char[] chars) {
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int i = 0;
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while (i < chars.length && isWhitespace(chars[i])) {
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i++;
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}
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int j = chars.length - 1;
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while (j >= i && isWhitespace(chars[j])) {
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j--;
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}
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char[] trimmed = new char[chars.length - i - (chars.length - 1 - j)];
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System.arraycopy(chars, i, trimmed, 0, trimmed.length);
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return trimmed;
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}
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/**
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* Return true, if the passed in char is a whitespace symbol (space, newline, tab).
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*
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* @param xar char
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* @return true if whitespace
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*/
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private static boolean isWhitespace(char xar) {
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return xar == ' ' || xar == '\n' || xar == '\t';
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}
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/**
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* Create a {@link Passphrase} from a {@link String}.
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*
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* @param password password
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* @return passphrase
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*/
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public static Passphrase fromPassword(@Nonnull String password) {
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return new Passphrase(password.toCharArray());
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}
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/**
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* Overwrite the char array with spaces and mark the {@link Passphrase} as invalidated.
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*/
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public void clear() {
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synchronized (lock) {
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if (chars != null) {
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Arrays.fill(chars, ' ');
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}
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valid = false;
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}
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}
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/**
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* Return a copy of the underlying char array.
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* A return value of {@code null} represents no password.
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*
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* @return passphrase chars.
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*
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* @throws IllegalStateException in case the password has been cleared at this point.
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*/
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public @Nullable char[] getChars() {
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synchronized (lock) {
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if (!valid) {
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throw new IllegalStateException("Passphrase has been cleared.");
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}
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if (chars == null) {
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return null;
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}
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char[] copy = new char[chars.length];
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System.arraycopy(chars, 0, copy, 0, chars.length);
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return copy;
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}
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}
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/**
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* Return true if the passphrase has not yet been cleared.
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*
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* @return valid
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*/
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public boolean isValid() {
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synchronized (lock) {
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return valid;
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}
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}
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/**
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* Return true if the passphrase represents no password.
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*
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* @return empty
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*/
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public boolean isEmpty() {
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synchronized (lock) {
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return valid && chars == null;
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}
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}
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/**
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* Represents a {@link Passphrase} instance that represents no password.
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*
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* @return empty passphrase
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*/
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public static Passphrase emptyPassphrase() {
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return new Passphrase(null);
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}
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@Override
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public int hashCode() {
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if (getChars() == null) {
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return 0;
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}
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return new String(getChars()).hashCode();
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}
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@Override
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public boolean equals(Object obj) {
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if (obj == null) {
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return false;
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}
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if (this == obj) {
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return true;
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}
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if (!(obj instanceof Passphrase)) {
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return false;
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}
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Passphrase other = (Passphrase) obj;
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return (getChars() == null && other.getChars() == null) ||
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org.bouncycastle.util.Arrays.constantTimeAreEqual(getChars(), other.getChars());
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}
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}
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@ -0,0 +1,105 @@
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// SPDX-FileCopyrightText: 2023 Paul Schaub <vanitasvitae@fsfe.org>
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//
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// SPDX-License-Identifier: Apache-2.0
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package org.pgpainless.util
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import org.bouncycastle.util.Arrays
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/**
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* Passphrase for keys or messages.
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*
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* @param chars may be null for empty passwords.
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*/
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class Passphrase(
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chars: CharArray?
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) {
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private val lock = Any()
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private var valid = true
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private val chars: CharArray?
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init {
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this.chars = trimWhitespace(chars)
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}
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/**
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* Return a copy of the underlying char array.
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* A return value of null represents an empty password.
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*
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* @return passphrase chars.
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*
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* @throws IllegalStateException in case the password has been cleared at this point.
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*/
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fun getChars(): CharArray? = synchronized(lock) {
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check(valid) { "Passphrase has been cleared." }
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chars?.copyOf()
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}
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/**
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* Return true if the passphrase has not yet been cleared.
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*
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* @return valid
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*/
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val isValid: Boolean
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get() = synchronized(lock) { valid }
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/**
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* Return true if the passphrase represents no password.
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*
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* @return empty
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*/
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val isEmpty: Boolean
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get() = synchronized(lock) { valid && chars == null }
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/**
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* Overwrite the char array with spaces and mark the [Passphrase] as invalidated.
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*/
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fun clear() = synchronized(lock) {
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chars?.fill(' ')
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valid = false
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}
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override fun equals(other: Any?): Boolean {
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return if (other == null)
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false
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else if (this === other)
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true
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else if (other !is Passphrase)
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false
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else
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getChars() == null && other.getChars() == null || Arrays.constantTimeAreEqual(getChars(), other.getChars())
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}
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override fun hashCode(): Int = getChars()?.let { String(it) }.hashCode()
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companion object {
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/**
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* Create a [Passphrase] from a [CharSequence].
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*
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* @param password password
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* @return passphrase
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*/
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@JvmStatic
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fun fromPassword(password: CharSequence) = Passphrase(password.toString().toCharArray())
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@JvmStatic
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fun emptyPassphrase() = Passphrase(null)
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/**
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* Return a copy of the passed in char array, with leading and trailing whitespace characters removed.
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* If the passed in char array is null, return null.
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* If the resulting char array is empty, return null as well.
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*
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* @param chars char array
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* @return copy of char array with leading and trailing whitespace characters removed
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*/
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@JvmStatic
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private fun trimWhitespace(chars: CharArray?): CharArray? {
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return chars?.dropWhile { it.isWhitespace() }
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?.dropLastWhile { it.isWhitespace() }
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?.toCharArray()
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?.let { if (it.isEmpty()) null else it }
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}
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}
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}
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