一、DES加密和解密
- package com.itjh.javaUtil;
- import java.io.UnsupportedEncodingException;
- import java.security.InvalidKeyException;
- import java.security.NoSuchAlgorithmException;
- import java.security.SecureRandom;
- import java.security.spec.InvalidKeySpecException;
- import javax.crypto.BadPaddingException;
- import javax.crypto.Cipher;
- import javax.crypto.IllegalBlockSizeException;
- import javax.crypto.KeyGenerator;
- import javax.crypto.NoSuchPaddingException;
- import javax.crypto.SecretKey;
- import javax.crypto.SecretKeyFactory;
- import javax.crypto.spec.DESKeySpec;
- /**
- * DES加密和解密。
- *
- * @author 宋立君
- * @date 2014年07月03日
- */
- public class DESUtil {
- /** 安全密钥 */
- private String keyData = "ABCDEFGHIJKLMNOPQRSTWXYZabcdefghijklmnopqrstwxyz0123456789-_.";
- /**
- * 功能:构造
- *
- * @author 宋立君
- * @date 2014年07月03日
- */
- public DESUtil() {
- }
- /**
- * 功能:构造
- *
- * @author 宋立君
- * @date 2014年07月03日
- * @param keyData
- * key
- */
- public DESUtil(String key) {
- this.keyData = key;
- }
- /**
- * 功能:加密 (UTF-8)
- *
- * @author 宋立君
- * @date 2014年07月03日
- * @param source
- * 源字符串
- * @param charSet
- * 编码
- * @return String
- * @throws UnsupportedEncodingException
- * 编码异常
- */
- public String encrypt(String source) throws UnsupportedEncodingException {
- return encrypt(source, "UTF-8");
- }
- /**
- *
- * 功能:解密 (UTF-8)
- *
- * @author 宋立君
- * @date 2014年07月03日
- * @param encryptedData
- * 被加密后的字符串
- * @return String
- * @throws UnsupportedEncodingException
- * 编码异常
- */
- public String decrypt(String encryptedData)
- throws UnsupportedEncodingException {
- return decrypt(encryptedData, "UTF-8");
- }
- /**
- * 功能:加密
- *
- * @author 宋立君
- * @date 2014年07月03日
- * @param source
- * 源字符串
- * @param charSet
- * 编码
- * @return String
- * @throws UnsupportedEncodingException
- * 编码异常
- */
- public String encrypt(String source, String charSet)
- throws UnsupportedEncodingException {
- String encrypt = null;
- byte[] ret = encrypt(source.getBytes(charSet));
- encrypt = new String(Base64.encode(ret));
- return encrypt;
- }
- /**
- *
- * 功能:解密
- *
- * @author 宋立君
- * @date 2014年07月03日
- * @param encryptedData
- * 被加密后的字符串
- * @param charSet
- * 编码
- * @return String
- * @throws UnsupportedEncodingException
- * 编码异常
- */
- public String decrypt(String encryptedData, String charSet)
- throws UnsupportedEncodingException {
- String descryptedData = null;
- byte[] ret = descrypt(Base64.decode(encryptedData.toCharArray()));
- descryptedData = new String(ret, charSet);
- return descryptedData;
- }
- /**
- * 加密数据 用生成的密钥加密原始数据
- *
- * @param primaryData
- * 原始数据
- * @return byte[]
- * @author 宋立君
- * @date 2014年07月03日
- */
- private byte[] encrypt(byte[] primaryData) {
- /** 取得安全密钥 */
- byte rawKeyData[] = getKey();
- /** DES算法要求有一个可信任的随机数源 */
- SecureRandom sr = new SecureRandom();
- /** 使用原始密钥数据创建DESKeySpec对象 */
- DESKeySpec dks = null;
- try {
- dks = new DESKeySpec(keyData.getBytes());
- } catch (InvalidKeyException e) {
- e.printStackTrace();
- }
- /** 创建一个密钥工厂 */
- SecretKeyFactory keyFactory = null;
- try {
- keyFactory = SecretKeyFactory.getInstance("DES");
- } catch (NoSuchAlgorithmException e) {
- e.printStackTrace();
- }
- /** 用密钥工厂把DESKeySpec转换成一个SecretKey对象 */
- SecretKey key = null;
- try {
- key = keyFactory.generateSecret(dks);
- } catch (InvalidKeySpecException e) {
- e.printStackTrace();
- }
- /** Cipher对象实际完成加密操作 */
- Cipher cipher = null;
- try {
- cipher = Cipher.getInstance("DES");
- } catch (NoSuchAlgorithmException e) {
- e.printStackTrace();
- } catch (NoSuchPaddingException e) {
- e.printStackTrace();
- }
- /** 用密钥初始化Cipher对象 */
- try {
- cipher.init(Cipher.ENCRYPT_MODE, key, sr);
- } catch (InvalidKeyException e) {
- e.printStackTrace();
- }
- /** 正式执行加密操作 */
- byte encryptedData[] = null;
- try {
- encryptedData = cipher.doFinal(primaryData);
- } catch (IllegalStateException e) {
- e.printStackTrace();
- } catch (IllegalBlockSizeException e) {
- e.printStackTrace();
- } catch (BadPaddingException e) {
- e.printStackTrace();
- }
- /** 返回加密数据 */
- return encryptedData;
- }
- /**
- * 用密钥解密数据
- *
- * @param encryptedData
- * 加密后的数据
- * @return byte[]
- * @author 宋立君
- * @date 2014年07月03日
- */
- private byte[] descrypt(byte[] encryptedData) {
- /** DES算法要求有一个可信任的随机数源 */
- SecureRandom sr = new SecureRandom();
- /** 取得安全密钥 */
- byte rawKeyData[] = getKey();
- /** 使用原始密钥数据创建DESKeySpec对象 */
- DESKeySpec dks = null;
- try {
- dks = new DESKeySpec(keyData.getBytes());
- } catch (InvalidKeyException e) {
- e.printStackTrace();
- }
- /** 创建一个密钥工厂 */
- SecretKeyFactory keyFactory = null;
- try {
- keyFactory = SecretKeyFactory.getInstance("DES");
- } catch (NoSuchAlgorithmException e) {
- e.printStackTrace();
- }
- /** 用密钥工厂把DESKeySpec转换成一个SecretKey对象 */
- SecretKey key = null;
- try {
- key = keyFactory.generateSecret(dks);
- } catch (InvalidKeySpecException e) {
- e.printStackTrace();
- }
- /** Cipher对象实际完成加密操作 */
- Cipher cipher = null;
- try {
- cipher = Cipher.getInstance("DES");
- } catch (NoSuchAlgorithmException e) {
- e.printStackTrace();
- } catch (NoSuchPaddingException e) {
- e.printStackTrace();
- }
- /** 用密钥初始化Cipher对象 */
- try {
- cipher.init(Cipher.DECRYPT_MODE, key, sr);
- } catch (InvalidKeyException e) {
- e.printStackTrace();
- }
- /** 正式执行解密操作 */
- byte decryptedData[] = null;
- try {
- decryptedData = cipher.doFinal(encryptedData);
- } catch (IllegalStateException e) {
- e.printStackTrace();
- } catch (IllegalBlockSizeException e) {
- e.printStackTrace();
- } catch (BadPaddingException e) {
- e.printStackTrace();
- }
- return decryptedData;
- }
- /**
- * 取得安全密钥 此方法作废,因为每次key生成都不一样导致解密加密用的密钥都不一样, 从而导致Given final block not
- * properly padded错误.
- *
- * @return byte数组
- * @author 宋立君
- * @date 2014年07月03日
- */
- private byte[] getKey() {
- /** DES算法要求有一个可信任的随机数源 */
- SecureRandom sr = new SecureRandom();
- /** 为我们选择的DES算法生成一个密钥生成器对象 */
- KeyGenerator kg = null;
- try {
- kg = KeyGenerator.getInstance("DES");
- } catch (NoSuchAlgorithmException e) {
- e.printStackTrace();
- }
- kg.init(sr);
- /** 生成密钥工具类 */
- SecretKey key = kg.generateKey();
- /** 生成密钥byte数组 */
- byte rawKeyData[] = key.getEncoded();
- return rawKeyData;
- }
- }
二、Base64加密和解密
- package com.itjh.javaUtil;
- import java.io.*;
- /**
- * Base64 编码和解码。
- *
- * @author 宋立君
- * @date 2014年07月03日
- */
- public class Base64 {
- public Base64() {
- }
- /**
- * 功能:编码字符串
- *
- * @author 宋立君
- * @date 2014年07月03日
- * @param data
- * 源字符串
- * @return String
- */
- public static String encode(String data) {
- return new String(encode(data.getBytes()));
- }
- /**
- * 功能:解码字符串
- *
- * @author 宋立君
- * @date 2014年07月03日
- * @param data
- * 源字符串
- * @return String
- */
- public static String decode(String data) {
- return new String(decode(data.toCharArray()));
- }
- /**
- * 功能:编码byte[]
- *
- * @author 宋立君
- * @date 2014年07月03日
- * @param data
- * 源
- * @return char[]
- */
- public static char[] encode(byte[] data) {
- char[] out = new char[((data.length + 2) / 3) * 4];
- for (int i = 0, index = 0; i < data.length; i += 3, index += 4) {
- boolean quad = false;
- boolean trip = false;
- int val = (0xFF & (int) data[i]);
- val <<= 8;
- if ((i + 1) < data.length) {
- val |= (0xFF & (int) data[i + 1]);
- trip = true;
- }
- val <<= 8;
- if ((i + 2) < data.length) {
- val |= (0xFF & (int) data[i + 2]);
- quad = true;
- }
- out[index + 3] = alphabet[(quad ? (val & 0x3F) : 64)];
- val >>= 6;
- out[index + 2] = alphabet[(trip ? (val & 0x3F) : 64)];
- val >>= 6;
- out[index + 1] = alphabet[val & 0x3F];
- val >>= 6;
- out[index + 0] = alphabet[val & 0x3F];
- }
- return out;
- }
- /**
- * 功能:解码
- *
- * @author 宋立君
- * @date 2014年07月03日
- * @param data
- * 编码后的字符数组
- * @return byte[]
- */
- public static byte[] decode(char[] data) {
- int tempLen = data.length;
- for (int ix = 0; ix < data.length; ix++) {
- if ((data[ix] > 255) || codes[data[ix]] < 0) {
- --tempLen; // ignore non-valid chars and padding
- }
- }
- // calculate required length:
- // -- 3 bytes for every 4 valid base64 chars
- // -- plus 2 bytes if there are 3 extra base64 chars,
- // or plus 1 byte if there are 2 extra.
- int len = (tempLen / 4) * 3;
- if ((tempLen % 4) == 3) {
- len += 2;
- }
- if ((tempLen % 4) == 2) {
- len += 1;
- }
- byte[] out = new byte[len];
- int shift = 0; // # of excess bits stored in accum
- int accum = 0; // excess bits
- int index = 0;
- // we now go through the entire array (NOT using the 'tempLen' value)
- for (int ix = 0; ix < data.length; ix++) {
- int value = (data[ix] > 255) ? -1 : codes[data[ix]];
- if (value >= 0) { // skip over non-code
- accum <<= 6; // bits shift up by 6 each time thru
- shift += 6; // loop, with new bits being put in
- accum |= value; // at the bottom.
- if (shift >= 8) { // whenever there are 8 or more shifted in,
- shift -= 8; // write them out (from the top, leaving any
- out[index++] = // excess at the bottom for next iteration.
- (byte) ((accum >> shift) & 0xff);
- }
- }
- }
- // if there is STILL something wrong we just have to throw up now!
- if (index != out.length) {
- throw new Error("Miscalculated data length (wrote " + index
- + " instead of " + out.length + ")");
- }
- return out;
- }
- /**
- * 功能:编码文件
- *
- * @author 宋立君
- * @date 2014年07月03日
- * @param file
- * 源文件
- */
- public static void encode(File file) throws IOException {
- if (!file.exists()) {
- System.exit(0);
- }
- else {
- byte[] decoded = readBytes(file);
- char[] encoded = encode(decoded);
- writeChars(file, encoded);
- }
- file = null;
- }
- /**
- * 功能:解码文件。
- *
- * @author 宋立君
- * @date 2014年07月03日
- * @param file
- * 源文件
- * @throws IOException
- */
- public static void decode(File file) throws IOException {
- if (!file.exists()) {
- System.exit(0);
- } else {
- char[] encoded = readChars(file);
- byte[] decoded = decode(encoded);
- writeBytes(file, decoded);
- }
- file = null;
- }
- //
- // code characters for values 0..63
- //
- private static char[] alphabet = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/="
- .toCharArray();
- //
- // lookup table for converting base64 characters to value in range 0..63
- //
- private static byte[] codes = new byte[256];
- static {
- for (int i = 0; i < 256; i++) {
- codes[i] = -1;
- // LoggerUtil.debug(i + "&" + codes[i] + " ");
- }
- for (int i = 'A'; i <= 'Z'; i++) {
- codes[i] = (byte) (i - 'A');
- // LoggerUtil.debug(i + "&" + codes[i] + " ");
- }
- for (int i = 'a'; i <= 'z'; i++) {
- codes[i] = (byte) (26 + i - 'a');
- // LoggerUtil.debug(i + "&" + codes[i] + " ");
- }
- for (int i = '0'; i <= '9'; i++) {
- codes[i] = (byte) (52 + i - '0');
- // LoggerUtil.debug(i + "&" + codes[i] + " ");
- }
- codes['+'] = 62;
- codes['/'] = 63;
- }
- private static byte[] readBytes(File file) throws IOException {
- ByteArrayOutputStream baos = new ByteArrayOutputStream();
- byte[] b = null;
- InputStream fis = null;
- InputStream is = null;
- try {
- fis = new FileInputStream(file);
- is = new BufferedInputStream(fis);
- int count = 0;
- byte[] buf = new byte[16384];
- while ((count = is.read(buf)) != -1) {
- if (count > 0) {
- baos.write(buf, 0, count);
- }
- }
- b = baos.toByteArray();
- } finally {
- try {
- if (fis != null)
- fis.close();
- if (is != null)
- is.close();
- if (baos != null)
- baos.close();
- } catch (Exception e) {
- System.out.println(e);
- }
- }
- return b;
- }
- private static char[] readChars(File file) throws IOException {
- CharArrayWriter caw = new CharArrayWriter();
- Reader fr = null;
- Reader in = null;
- try {
- fr = new FileReader(file);
- in = new BufferedReader(fr);
- int count = 0;
- char[] buf = new char[16384];
- while ((count = in.read(buf)) != -1) {
- if (count > 0) {
- caw.write(buf, 0, count);
- }
- }
- } finally {
- try {
- if (caw != null)
- caw.close();
- if (in != null)
- in.close();
- if (fr != null)
- fr.close();
- } catch (Exception e) {
- System.out.println(e);
- }
- }
- return caw.toCharArray();
- }
- private static void writeBytes(File file, byte[] data) throws IOException {
- OutputStream fos = null;
- OutputStream os = null;
- try {
- fos = new FileOutputStream(file);
- os = new BufferedOutputStream(fos);
- os.write(data);
- } finally {
- try {
- if (os != null)
- os.close();
- if (fos != null)
- fos.close();
- } catch (Exception e) {
- System.out.println(e);
- }
- }
- }
- private static void writeChars(File file, char[] data) throws IOException {
- Writer fos = null;
- Writer os = null;
- try {
- fos = new FileWriter(file);
- os = new BufferedWriter(fos);
- os.write(data);
- } finally {
- try {
- if (os != null)
- os.close();
- if (fos != null)
- fos.close();
- } catch (Exception e) {
- e.printStackTrace();
- }
- }
- }
- // /////////////////////////////////////////////////
- // end of test code.
- // /////////////////////////////////////////////////
- }