常用加密工具

import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.OutputStream;

import javax.crypto.Cipher;
import javax.crypto.spec.IvParameterSpec;
import javax.crypto.spec.SecretKeySpec;

import com.redoor.rcs.person.PersonItemSetActivity;

/**
* @preserve public
* @author wuchao
*
*/
public class DES {

private static final String ALGORITHM = "DES";

private static final String CIPHER = "DES";

private String DEFAULT_KEY = PersonItemSetActivity.KEY_QRCODE_DES_ENCODE;
// Des加密解密的密匙

private static byte[] iv = { 1, 2, 3, 4, 5, 6, 7, 8 };

private static final char[] legalChars = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/="
.toCharArray();

/**
* 指定密钥构造方法
*
*/
public DES() {
}

/**
* 指定密钥构造方法
*
* @param strKey
*            指定的密钥
*/
public DES(String strKey) {
DEFAULT_KEY = strKey;
}

/**
* data[]
*
* @param data
* @return
*/
public static String encode(byte[] data) {

int start = 0;
int len = data.length;
StringBuffer buf = new StringBuffer(data.length * 3 / 2);

int end = len - 3;
int i = start;
int n = 0;

while (i <= end) {
int d = (((data[i]) & 0x0ff) << 16) | (((data[i + 1]) & 0x0ff) << 8) | ((data[i + 2]) & 0x0ff);

buf.append(legalChars[(d >> 18) & 63]);
buf.append(legalChars[(d >> 12) & 63]);
buf.append(legalChars[(d >> 6) & 63]);
buf.append(legalChars[d & 63]);

i += 3;

if (n++ >= 14) {
n = 0;
buf.append(" ");
}
}

if (i == start + len - 2) {
int d = (((data[i]) & 0x0ff) << 16) | (((data[i + 1]) & 255) << 8);

buf.append(legalChars[(d >> 18) & 63]);
buf.append(legalChars[(d >> 12) & 63]);
buf.append(legalChars[(d >> 6) & 63]);
buf.append("=");
} else if (i == start + len - 1) {
int d = ((data[i]) & 0x0ff) << 16;

buf.append(legalChars[(d >> 18) & 63]);
buf.append(legalChars[(d >> 12) & 63]);
buf.append("==");
}

return buf.toString();
}

public static String parseByte2HexStr(byte buf[]) {

StringBuffer sb = new StringBuffer();
for (int i = 0; i < buf.length; i++) {
String hex = Integer.toHexString(buf[i] & 0xFF);
if (hex.length() == 1) {
hex = '0' + hex;
}
sb.append(hex.toUpperCase());
}
return sb.toString();
}

public static byte[] decode(String s) {

ByteArrayOutputStream bos = new ByteArrayOutputStream();
try {
decode(s, bos);
} catch (IOException e) {
throw new RuntimeException();
}
byte[] decodedBytes = bos.toByteArray();
try {
bos.close();
bos = null;
} catch (IOException ex) {
// System.err.println("Error while decoding BASE64: " +
// ex.toString());
}
return decodedBytes;
}

private static void decode(String s, OutputStream os) throws IOException {

int i = 0;

int len = s.length();

while (true) {
while (i < len && s.charAt(i) <= ' ')
i++;

if (i == len)
break;

int tri = (decode(s.charAt(i)) << 18) + (decode(s.charAt(i + 1)) << 12) + (decode(s.charAt(i + 2)) << 6)
+ (decode(s.charAt(i + 3)));

os.write((tri >> 16) & 255);
if (s.charAt(i + 2) == '=')
break;
os.write((tri >> 8) & 255);
if (s.charAt(i + 3) == '=')
break;
os.write(tri & 255);

i += 4;
}
}

private static int decode(char c) {

if (c >= 'A' && c <= 'Z')
return (c) - 65;
else if (c >= 'a' && c <= 'z')
return (c) - 97 + 26;
else if (c >= '0' && c <= '9')
return (c) - 48 + 26 + 26;
else
switch (c) {
case '+':
return 62;
case '/':
return 63;
case '=':
return 0;
default:
throw new RuntimeException("unexpected code: " + c);
}
}

public String encrypt(String strIn, String key, String encoding) throws Exception {

return encryptDES(strIn, key, encoding);
}

public String decrypt(String strIn, String key, String encoding) throws Exception {

return decryptDES(strIn, key, encoding);
}

private String encryptDES(String encryptString, String encryptKey, String encoding) throws Exception {

IvParameterSpec zeroIv = new IvParameterSpec(iv);
SecretKeySpec key = new SecretKeySpec(encryptKey.getBytes(), ALGORITHM);
Cipher cipher = Cipher.getInstance(CIPHER);
cipher.init(Cipher.ENCRYPT_MODE, key);//ecb  PKS7|PKCS5(DEFAULT)
byte[] encryptedData = cipher.doFinal(encryptString.getBytes(encoding));

System.out.println(bytes2HexString(encryptedData));

return Base64.encode(encryptedData);
}

private String decryptDES(String decryptString, String decryptKey, String encoding) throws Exception {

byte[] byteMi = Base64.decode(decryptString);
IvParameterSpec zeroIv = new IvParameterSpec(iv);
SecretKeySpec key = new SecretKeySpec(decryptKey.getBytes(), ALGORITHM);
Cipher cipher = Cipher.getInstance(CIPHER);
cipher.init(Cipher.DECRYPT_MODE, key);
byte decryptedData[] = cipher.doFinal(byteMi);

return new String(decryptedData, encoding);
}

/** 使用BASE64时的字符集编码. */
public static final String CHARSET = "UTF-8";

/**
* 先DEC加密，再用Base64转换 。JDK默认： ECB 加密模式和 PKCS#5 填充方式.
*
* @param input
*            the input
* @return the string
* @throws Exception
*             the exception
*/
public String encryptDESBeas64(String input) throws CoderException {
try {
return encryptDES(input, DEFAULT_KEY, CHARSET);
} catch (Exception e) {
throw new CoderException(e);
}
}

/**
* 先用Base64转换,再DEC解密 。JDK默认： ECB 加密模式和 PKCS#5 填充方式.
*
* @param input
*            the input
* @return the string
* @throws Exception
*             the exception
*/
public String decryptBeas64DES(String input) throws CoderException {
try {
return decryptDES(input, DEFAULT_KEY, CHARSET);
} catch (Exception e) {
throw new CoderException(e);
}
}

public static String bytes2HexString(byte[] b) {
StringBuffer result = new StringBuffer();
String hex;
for (int i = 0; i < b.length; i++) {
hex = Integer.toHexString(b[i] & 0xFF);
if (hex.length() == 1) {
hex = '0' + hex;
}
result.append(hex.toUpperCase());
}
return result.toString();
}

public static void main(String args[]) {
DES des = new DES("10739360");
try {
String account = "39900378945";
account = des.encryptDESBeas64(account);
// account = des.encode(account.getBytes());
System.out.println("account密文=" + account);

account = des.decryptBeas64DES(account);
System.out.println("account明文=" + account);

} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}