java常用工具類之DES和Base64加密解密類

一、DES加密與解密

package com.itjh.javaUtil;import java.io.UnsupportedEncodingException;import java.security.InvalidKeyException;import java.security.NoSuchAlgorithmException;import java.security.SecureRandom; javax.crypto.BadPaddingException;import javax.crypto.Cipher;import javax.crypto.IllegalBlockSizeException;import javax.crypto.KeyGenerator;import javax.crypto.NoSuchdingExceptionKeyFactorimport j.Key; javax.crypto.spec.DESKeySpec;/** * DES加密和解密。 * * @author 宋立君* @date 2014年07月03日*/public class DESUtil {/** 安全金鑰*/private String keyData = "ABCDEFGHIJKLMNOPQRSTWXYZabcdefghijklmnopqrs @twxyz0123456789-_Zabcdefgh*宋立君* @date 2014年07月03日*/public DESUtil() {}/** * 功能：建構* * @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 * 來源字串* @param charSet * 編碼* @return String * @throws UnsupportedEncodingException * 編碼異常*/public String encrypt(String source) throws UnsupportedEncodingException {return encrypt(String,UTFptcoding -8");}/** * *功能：解密(UTF-8) * * @author 宋立君* @date 2014年07月03日* @param encryptedData * 加密後的字串* @return String * @throws UnsupportedEncodingException * 編碼異常*/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 * 來源字串* @param charSet * 編碼* @return String * @throws UnsupportedEncodingException * 編碼異常*/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}/** * 功能：解密}/** * * @author 宋立君* @date 2014年07月03日* @param encryptedData * 加密後的字串* @param charSet * 編碼* @return String * @throws UnsupportedEncodingException * 編碼例外*/public String decrypt(String encryptedData, String charSet)throws UnsupportedEncodingException { EncodingException { ret = descrypt(Base64.decode(encryptedData.toCharArray()));descryptedData = new String(ret, charSet);return descryptedData;}/** * 加密資料以產生的金鑰加密原始資料* * @param primaryData * 原始資料* @return byte[] * @author 宋立君* @date 2014年07月03日*/private byte[] encrypt(byte[] primaryData) {/** 取得安全金鑰*/byte rawKeyData[] = getKey();/** DES演算法要求有一個可信任的隨機數源*/SecureRandom sr = new SecureRandom();/** 使用原始金鑰資料建立DESKeySpec物件*/DESKeySpec dks = null;try {dks = new DESKeySpec(keyData.getBytes());} catch (InvalidKeyException e) {e.printStackTrace();}/ Secret 建立一個金鑰工廠*/SecretKeyFactory keyFactory = null;Keytry {keyFactory =**KeyFactory .getInstance("DES");} catch (NoSuchAlgorithmException e) {e.printStackTrace();}/** 用金鑰工廠把DESKeySpec轉換成一個SecretKey物件*/SecretKey key = null;try {key = keyFactory.generateSecret(dks);} catch (InvalidKeySpecException e) {e.printStackTrace ();}/** Cipher物件實際完成加密操作*/Cipher cipher = null;try {cipher = Cipher.getInstance("DES");} catch (NoSuchAlgorithmException e) {e.printStackTrace();} catch (NoSuchPaddingException e) {e.printStackTrace();}/** 用金鑰初始化Cipher物件*/try {cipher .init(Cipher.ENCRYPT_MODE, key, sr);} catch (InvalidKeyException e) {e.printStackTrace();}/** 正式執行加密作業*/byte encryptedData[] = null;try {encryptedData = cipher.doFinal(primaryData);} catch (IllegalStateException e) {e.printStackTrace();} catch (IllegalBlockSizeException e) {e.printStackTrace();} catch (BadPaddingException e) {e.printStackTrace();}/** 回傳加密資料*/return encryptedData;}/** * 用金鑰解密資料* * @param encryptedData * 加密後的資料* @return byte[] * @author 宋立君* @date 2014年07月03日*/private byte[] descrypt(byte[] encryptedData) {/** DES演算法要求有一個可信任的隨機數字來源*/SecureRandom sr = new SecureRandom();/** 取得安全金鑰*/byte rawKeyData[] = getKey();/** 使用原始金鑰資料建立DESKeySpec對象*/DESKeySpec dks = null;try {dks = new DESKeySpec(keyData.getBytes());} catch (InvalidKeyException e) {e.printStackTrace();}/** 建立一個金鑰工廠*/SecretKeyFactory keyFactory = null;try {keyFactory = SecretKeyFactory.getInstance("DES");} catch (NoSuchAlgorithmException e) {e.printStackTrace();} /** 用金鑰工廠把DESKeySpec轉換成一個SecretKey物件*/SecretKey key = null;try {key = keyFactory.generateSecret(dks);} catch (InvalidKeySpecException e) {e.printStackTrace();}/** Cipher物件實際完成加密作業*/Cipher cipher = null;try {cipher = Cipher.getInstance("DES"); } catch (NoSuchAlgorithmException e) {e.printStackTrace();} catch (NoSuchPaddingException e) {e.printStackTrace();}/** 用金鑰初始化Cipher物件*/try {cipher.init(Cipher.DECRYPT_MODE, key, sr);} catch (InvalidException e) {e.printStackTrace() ;}/** 正式執行解密作業*/byte decryptedData[] = null;try {decryptedData = cipher.doFinal(encryptedData);} catch (IllegalStateException e) {e.printStackTrace();} catch (IllegalBlockSizeException e) {e.printStackTrace();} catch (BadPaddingException e) {e.printStackTrace();DatareturnException e); }/** *取得安全金鑰此方法作廢,因為每次key產生都不一樣導致解密加密用的金鑰都不一樣， 從而導致Given final block not * properly padded錯誤. * * @return byte陣列* @author 宋立君* @ date 2014年07月03日*/private byte[] getKey() {/** DES演算法要求有一個可信賴的隨機數源*/SecureRandom sr = new SecureRandom();/** 為我們選擇的DES演算法產生一個密鑰產生器物件*/KeyGenerator kg = null;try {kg = KeyGenerator.getInstance("DES");} catch (NoSuchAlgorithmException e) {e. printStackTrace();}kg.init(sr);/** 產生金鑰工具類別*/SecretKey key = kg.generateKey();/**產生金鑰byte陣列*/byte rawKeyData[] = key.getEncoded();return rawKeyData;}}

二、Base64加密與解密

package com.itjh.javaUtil;import java.io.*;/** * Base64 編碼和解碼。 * * @author 宋立君* @date 2014年07月03日*/public class Base64 {public Base64() {}/** * 功能：編碼字串* * @author 宋立君* @date 2014年07月03日* @param data * 來源字串* @return String */public static String encode(String data) {return new String(encode(data.getBytes()));}/** * 功能：解碼字串* * @author 宋立君* @date 2014年07月03日* @param data * 來源字串* @return String */ public static String decode(String 數據) {return new String(decode(data.toCharArray()));}/** * 功能：編碼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：解碼* * @author 宋立君* @date 2014年07月03日* @param data * 編碼後的字元陣列* @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：編碼檔案* * @author 宋立君* @date 2014年07月03日* @param file * 原始檔*/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：解碼檔。 * * @author 宋立君* @date 2014年07月03日* @param file * 原始檔* @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 stat. (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 = 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.// /////////////////////////////////////////////////}

PS：關於加密技術，本站也提供以下加密工具供大家參考使用：

BASE64編碼解碼工具： http://tools.VeVB.COm/transcoding/base64

MD5線上加密工具： http://tools.VeVB.COm/password/CreateMD5Password

Escape加密/解密工具： http://tools.VeVB.COm/password/escapepwd

線上SHA1加密工具： http://tools.VeVB.COm/password/sha1encode

短鏈(短網址) 線上產生工具：http: //tools.VeVB.COm/password/dwzcreate

短鏈(短網址) 線上還原工具：http: //tools.VeVB.COm/password/unshorturl

高強度密碼產生器： http://tools.VeVB.COm/password/CreateStrongPassword