java常用工具类之DES和Base64加密解密类

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;	}}

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.	// /////////////////////////////////////////////////}