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Diffstat (limited to 'app/src/main/java/com/wireguard/crypto/KeyEncoding.java')
-rw-r--r--app/src/main/java/com/wireguard/crypto/KeyEncoding.java161
1 files changed, 0 insertions, 161 deletions
diff --git a/app/src/main/java/com/wireguard/crypto/KeyEncoding.java b/app/src/main/java/com/wireguard/crypto/KeyEncoding.java
deleted file mode 100644
index d29c2d44..00000000
--- a/app/src/main/java/com/wireguard/crypto/KeyEncoding.java
+++ /dev/null
@@ -1,161 +0,0 @@
-/*
- * Copyright © 2017-2018 WireGuard LLC. All Rights Reserved.
- * SPDX-License-Identifier: Apache-2.0
- */
-
-package com.wireguard.crypto;
-
-import com.wireguard.android.Application;
-import com.wireguard.android.R;
-
-/**
- * This is a specialized constant-time base64 and hex implementation that resists side-channel attacks.
- */
-
-@SuppressWarnings("MagicNumber")
-public final class KeyEncoding {
- public static final int KEY_LENGTH = 32;
- public static final int KEY_LENGTH_BASE64 = 44;
- public static final int KEY_LENGTH_HEX = 64;
- private static final String KEY_LENGTH_BASE64_EXCEPTION_MESSAGE =
- Application.get().getString(R.string.key_length_base64_exception_message);
- private static final String KEY_LENGTH_EXCEPTION_MESSAGE =
- Application.get().getString(R.string.key_length_exception_message);
- private static final String KEY_LENGTH_HEX_EXCEPTION_MESSAGE =
- Application.get().getString(R.string.key_length_hex_exception_message);
-
- private KeyEncoding() {
- // Prevent instantiation.
- }
-
- private static int decodeBase64(final char[] src, final int srcOffset) {
- int val = 0;
- for (int i = 0; i < 4; ++i) {
- final char c = src[i + srcOffset];
- val |= (-1
- + ((((('A' - 1) - c) & (c - ('Z' + 1))) >>> 8) & (c - 64))
- + ((((('a' - 1) - c) & (c - ('z' + 1))) >>> 8) & (c - 70))
- + ((((('0' - 1) - c) & (c - ('9' + 1))) >>> 8) & (c + 5))
- + ((((('+' - 1) - c) & (c - ('+' + 1))) >>> 8) & 63)
- + ((((('/' - 1) - c) & (c - ('/' + 1))) >>> 8) & 64)
- ) << (18 - 6 * i);
- }
- return val;
- }
-
- private static void encodeBase64(final byte[] src, final int srcOffset,
- final char[] dest, final int destOffset) {
- final byte[] input = {
- (byte) ((src[srcOffset] >>> 2) & 63),
- (byte) ((src[srcOffset] << 4 | ((src[1 + srcOffset] & 0xff) >>> 4)) & 63),
- (byte) ((src[1 + srcOffset] << 2 | ((src[2 + srcOffset] & 0xff) >>> 6)) & 63),
- (byte) ((src[2 + srcOffset]) & 63),
- };
- for (int i = 0; i < 4; ++i) {
- dest[i + destOffset] = (char) (input[i] + 'A'
- + (((25 - input[i]) >>> 8) & 6)
- - (((51 - input[i]) >>> 8) & 75)
- - (((61 - input[i]) >>> 8) & 15)
- + (((62 - input[i]) >>> 8) & 3));
- }
- }
-
- public static byte[] keyFromBase64(final String str) {
- final char[] input = str.toCharArray();
- final byte[] key = new byte[KEY_LENGTH];
- if (input.length != KEY_LENGTH_BASE64 || input[KEY_LENGTH_BASE64 - 1] != '=')
- throw new IllegalArgumentException(KEY_LENGTH_BASE64_EXCEPTION_MESSAGE);
- int i;
- int ret = 0;
- for (i = 0; i < KEY_LENGTH / 3; ++i) {
- final int val = decodeBase64(input, i * 4);
- ret |= val >>> 31;
- key[i * 3] = (byte) ((val >>> 16) & 0xff);
- key[i * 3 + 1] = (byte) ((val >>> 8) & 0xff);
- key[i * 3 + 2] = (byte) (val & 0xff);
- }
- final char[] endSegment = {
- input[i * 4],
- input[i * 4 + 1],
- input[i * 4 + 2],
- 'A',
- };
- final int val = decodeBase64(endSegment, 0);
- ret |= (val >>> 31) | (val & 0xff);
- key[i * 3] = (byte) ((val >>> 16) & 0xff);
- key[i * 3 + 1] = (byte) ((val >>> 8) & 0xff);
-
- if (ret != 0)
- throw new IllegalArgumentException(KEY_LENGTH_BASE64_EXCEPTION_MESSAGE);
- return key;
- }
-
- public static byte[] keyFromHex(final String str) {
- final char[] input = str.toCharArray();
- final byte[] key = new byte[KEY_LENGTH];
- if (input.length != KEY_LENGTH_HEX)
- throw new IllegalArgumentException(KEY_LENGTH_HEX_EXCEPTION_MESSAGE);
- int ret = 0;
-
- for (int i = 0; i < KEY_LENGTH_HEX; i += 2) {
- int c;
- int cNum;
- int cNum0;
- int cAlpha;
- int cAlpha0;
- int cVal;
- final int cAcc;
-
- c = input[i];
- cNum = c ^ 48;
- cNum0 = ((cNum - 10) >>> 8) & 0xff;
- cAlpha = (c & ~32) - 55;
- cAlpha0 = (((cAlpha - 10) ^ (cAlpha - 16)) >>> 8) & 0xff;
- ret |= ((cNum0 | cAlpha0) - 1) >>> 8;
- cVal = (cNum0 & cNum) | (cAlpha0 & cAlpha);
- cAcc = cVal * 16;
-
- c = input[i + 1];
- cNum = c ^ 48;
- cNum0 = ((cNum - 10) >>> 8) & 0xff;
- cAlpha = (c & ~32) - 55;
- cAlpha0 = (((cAlpha - 10) ^ (cAlpha - 16)) >>> 8) & 0xff;
- ret |= ((cNum0 | cAlpha0) - 1) >>> 8;
- cVal = (cNum0 & cNum) | (cAlpha0 & cAlpha);
- key[i / 2] = (byte) (cAcc | cVal);
- }
- if (ret != 0)
- throw new IllegalArgumentException(KEY_LENGTH_HEX_EXCEPTION_MESSAGE);
- return key;
- }
-
- public static String keyToBase64(final byte[] key) {
- final char[] output = new char[KEY_LENGTH_BASE64];
- if (key.length != KEY_LENGTH)
- throw new IllegalArgumentException(KEY_LENGTH_EXCEPTION_MESSAGE);
- int i;
- for (i = 0; i < KEY_LENGTH / 3; ++i)
- encodeBase64(key, i * 3, output, i * 4);
- final byte[] endSegment = {
- key[i * 3],
- key[i * 3 + 1],
- 0,
- };
- encodeBase64(endSegment, 0, output, i * 4);
- output[KEY_LENGTH_BASE64 - 1] = '=';
- return new String(output);
- }
-
- public static String keyToHex(final byte[] key) {
- final char[] output = new char[KEY_LENGTH_HEX];
- if (key.length != KEY_LENGTH)
- throw new IllegalArgumentException(KEY_LENGTH_EXCEPTION_MESSAGE);
- for (int i = 0; i < KEY_LENGTH; ++i) {
- output[i * 2] = (char) (87 + (key[i] >> 4 & 0xf)
- + ((((key[i] >> 4 & 0xf) - 10) >> 8) & ~38));
- output[i * 2 + 1] = (char) (87 + (key[i] & 0xf)
- + ((((key[i] & 0xf) - 10) >> 8) & ~38));
- }
- return new String(output);
- }
-}