package com.vci.server.volume.delegate;
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public class RC4 {
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public static String decry_RC4(byte[] data, String key) {
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if (data == null || key == null) {
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return null;
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}
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return asString(RC4Base(data, key));
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}
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public static String decry_RC4(String data, String key) {
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if (data == null || key == null) {
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return null;
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}
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return new String(RC4Base(HexString2Bytes(data), key));
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}
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public static byte[] encry_RC4_byte(String data, String key) {
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if (data == null || key == null) {
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return null;
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}
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byte b_data[] = data.getBytes();
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return RC4Base(b_data, key);
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}
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public static byte[] encry_RC4_byte(byte[] b_data, String key) {
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if (b_data == null || key == null) {
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return null;
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}
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return RC4Base(b_data, key);
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}
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public static String encry_RC4_string(String data, String key) {
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if (data == null || key == null) {
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return null;
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}
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return toHexString(asString(encry_RC4_byte(data, key)));
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}
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private static String asString(byte[] buf) {
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StringBuffer strbuf = new StringBuffer(buf.length);
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for (int i = 0; i < buf.length; i++) {
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strbuf.append((char) buf[i]);
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}
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return strbuf.toString();
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}
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private static byte[] initKey(String aKey) {
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byte[] b_key = aKey.getBytes();
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byte state[] = new byte[256];
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for (int i = 0; i < 256; i++) {
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state[i] = (byte) i;
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}
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int index1 = 0;
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int index2 = 0;
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if (b_key == null || b_key.length == 0) {
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return null;
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}
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for (int i = 0; i < 256; i++) {
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index2 = ((b_key[index1] & 0xff) + (state[i] & 0xff) + index2) & 0xff;
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byte tmp = state[i];
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state[i] = state[index2];
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state[index2] = tmp;
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index1 = (index1 + 1) % b_key.length;
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}
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return state;
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}
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private static String toHexString(String s) {
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String str = "";
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for (int i = 0; i < s.length(); i++) {
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int ch = (int) s.charAt(i);
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String s4 = Integer.toHexString(ch & 0xFF);
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if (s4.length() == 1) {
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s4 = '0' + s4;
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}
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str = str + s4;
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}
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return str;// 0x��ʾʮ�����
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}
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private static byte[] HexString2Bytes(String src) {
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int size = src.length();
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byte[] ret = new byte[size / 2];
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byte[] tmp = src.getBytes();
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for (int i = 0; i < size / 2; i++) {
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ret[i] = uniteBytes(tmp[i * 2], tmp[i * 2 + 1]);
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}
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return ret;
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}
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private static byte uniteBytes(byte src0, byte src1) {
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char _b0 = (char)Byte.decode("0x" + new String(new byte[] { src0 }))
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.byteValue();
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_b0 = (char) (_b0 << 4);
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char _b1 = (char)Byte.decode("0x" + new String(new byte[] { src1 }))
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.byteValue();
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byte ret = (byte) (_b0 ^ _b1);
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return ret;
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}
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private static byte[] RC4Base (byte [] input, String mKkey) {
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int x = 0;
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int y = 0;
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byte key[] = initKey(mKkey);
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int xorIndex;
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byte[] result = new byte[input.length];
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for (int i = 0; i < input.length; i++) {
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x = (x + 1) & 0xff;
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y = ((key[x] & 0xff) + y) & 0xff;
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byte tmp = key[x];
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key[x] = key[y];
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key[y] = tmp;
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xorIndex = ((key[x] & 0xff) + (key[y] & 0xff)) & 0xff;
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result[i] = (byte) (input[i] ^ key[xorIndex]);
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}
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return result;
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}
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}
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