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【Java】 Java RC4 加密解密

作者:wangchenfeng / 发布于2015/4/14/ 650


	public class RC4 {
	
	 public static String decry_RC4(byte[] data, String key) {
	 if (data == null || key == null) {
	 return null;
	 }
	 return asString(RC4Base(data, key));
	 }
	
	
	 public static String decry_RC4(String data, String key) {
	 if (data == null || key == null) {
	 return null;
	 }
	 return new String(RC4Base(HexString2Bytes(data), key));
	 }
	
	
	 public static byte[] encry_RC4_byte(String data, String key) {
	 if (data == null || key == null) {
	 return null;
	 }
	 byte b_data[] = data.getBytes();
	 return RC4Base(b_data, key);
	 }
	
	
	 public static String encry_RC4_string(String data, String key) {
	 if (data == null || key == null) {
	 return null;
	 }
	 return toHexString(asString(encry_RC4_byte(data, key)));
	 }
	
	
	 private static String asString(byte[] buf) {
	 StringBuffer strbuf = new StringBuffer(buf.length);
	 for (int i = 0; i < buf.length; i++) {
	 strbuf.append((char) buf[i]);
	 }
	 return strbuf.toString();
	 }
	
	
	 private static byte[] initKey(String aKey) {
	 byte[] b_key = aKey.getBytes();
	 byte state[] = new byte[256];
	
	 for (int i = 0; i < 256; i++) {
	 state[i] = (byte) i;
	 }
	 int index1 = 0;
	 int index2 = 0;
	 if (b_key == null || b_key.length == 0) {
	 return null;
	 }
	 for (int i = 0; i < 256; i++) {
	 index2 = ((b_key[index1] & 0xff) + (state[i] & 0xff) + index2) & 0xff;
	 byte tmp = state[i];
	 state[i] = state[index2];
	 state[index2] = tmp;
	 index1 = (index1 + 1) % b_key.length;
	 }
	 return state;
	 }
	
	 private static String toHexString(String s) {
	 String str = "";
	 for (int i = 0; i < s.length(); i++) {
	 int ch = (int) s.charAt(i);
	 String s4 = Integer.toHexString(ch & 0xFF);
	 if (s4.length() == 1) {
	 s4 = '0' + s4;
	 }
	 str = str + s4;
	 }
	 return str;// 0x表示十六进制
	 }
	
	
	 private static byte[] HexString2Bytes(String src) {
	 int size = src.length();
	 byte[] ret = new byte[size / 2];
	 byte[] tmp = src.getBytes();
	 for (int i = 0; i < size / 2; i++) {
	 ret[i] = uniteBytes(tmp[i * 2], tmp[i * 2 + 1]);
	 }
	 return ret;
	 }
	
	 private static byte uniteBytes(byte src0, byte src1) {
	 char _b0 = (char)Byte.decode("0x" + new String(new byte[] { src0 }))
	 .byteValue();
	 _b0 = (char) (_b0 << 4);
	 char _b1 = (char)Byte.decode("0x" + new String(new byte[] { src1 }))
	 .byteValue();
	 byte ret = (byte) (_b0 ^ _b1);
	 return ret;
	 }
	
	 private static byte[] RC4Base (byte [] input, String mKkey) {
	 int x = 0;
	 int y = 0;
	 byte key[] = initKey(mKkey);
	 int xorIndex;
	 byte[] result = new byte[input.length];
	
	 for (int i = 0; i < input.length; i++) {
	 x = (x + 1) & 0xff;
	 y = ((key[x] & 0xff) + y) & 0xff;
	 byte tmp = key[x];
	 key[x] = key[y];
	 key[y] = tmp;
	 xorIndex = ((key[x] & 0xff) + (key[y] & 0xff)) & 0xff;
	 result[i] = (byte) (input[i] ^ key[xorIndex]);
	 }
	 return result;
	 }
	}

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