java常用工具类之DES和Base64加密解密类

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 accumint accum = 0; // excess bitsint 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-codeaccum <<= 6; // bits shift up by 6 each time thrushift += 6; // loop, with new bits being put inaccum |= value; // at the bottom.if (shift >= 8) { // whenever there are 8 or more shifted in,shift -= 8; // write them out (from the top, leaving anyout[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.// /////////////////////////////////////////////////}

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