/*
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Copyright (C) Huawei Technologies Co., Ltd. 2015. All rights reserved.
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See LICENSE.txt for this sample's licensing information.
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*/
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package com.huawei.android.hms.agent.game.checksignutil;
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/**
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* 将字符串用64位加密算法加密
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*/
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public class Base64Util
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{
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private static char[] alphabet = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=".toCharArray();
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private static byte[] codes = new byte[256];
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static
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{
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for (int i = 0; i < 256; i++)
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codes[i] = -1;
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for (int i = 'A'; i <= 'Z'; i++)
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codes[i] = (byte)(i - 'A');
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for (int i = 'a'; i <= 'z'; i++)
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codes[i] = (byte)(26 + i - 'a');
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for (int i = '0'; i <= '9'; i++)
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codes[i] = (byte)(52 + i - '0');
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codes['+'] = 62;
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codes['/'] = 63;
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}
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public static String encode(byte[] data)
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{
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return encode(data, data.length);
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}
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public static String encode(byte[] data, int length)
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{
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char[] out = new char[((length + 2) / 3) * 4];
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for (int i = 0, index = 0; i < length; i += 3, index += 4)
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{
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boolean quad = false;
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boolean trip = false;
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int val = (0xFF & (int)data[i]);
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val <<= 8;
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if ((i + 1) < length)
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{
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val |= (0xFF & (int)data[i + 1]);
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trip = true;
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}
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val <<= 8;
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if ((i + 2) < length)
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{
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val |= (0xFF & (int)data[i + 2]);
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quad = true;
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}
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out[index + 3] = alphabet[(quad ? (val & 0x3F) : 64)];
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val >>= 6;
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out[index + 2] = alphabet[(trip ? (val & 0x3F) : 64)];
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val >>= 6;
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out[index + 1] = alphabet[val & 0x3F];
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val >>= 6;
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out[index + 0] = alphabet[val & 0x3F];
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}
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return new String(out);
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}
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public static byte[] decode(String data)
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{
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int tempLen = data.length();
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for (int ix = 0; ix < data.length(); ix++)
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{
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if ((data.charAt(ix) > 255) || codes[data.charAt(ix)] < 0)
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--tempLen;
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}
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int len = (tempLen / 4) * 3;
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if ((tempLen % 4) == 3)
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len += 2;
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if ((tempLen % 4) == 2)
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len += 1;
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byte[] out = new byte[len];
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int shift = 0;
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int accum = 0;
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int index = 0;
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for (int ix = 0; ix < data.length(); ix++)
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{
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int value = (data.charAt(ix) > 255) ? -1 : codes[data.charAt(ix)];
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if (value >= 0)
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{
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accum <<= 6;
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shift += 6;
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accum |= value;
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if (shift >= 8)
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{
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shift -= 8;
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out[index++] =
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(byte)((accum >> shift) & 0xff);
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}
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}
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}
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if (index != out.length)
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{
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return new byte[0];
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}
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return out;
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}
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}
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