本文实例为大家分享了一个适用于JavaSE/JavaEE/Android的Java加密解密工具,供大家学习,具体内容如下
- package longshu.utils.security;
-
- import java.lang.reflect.Method;
- import java.security.InvalidKeyException;
- import java.security.Key;
- import java.security.MessageDigest;
- import java.security.NoSuchAlgorithmException;
- import java.security.SecureRandom;
-
- 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.spec.SecretKeySpec;
-
- /**
- * Java加密解密工具.
- * JavaSE/JavaEE/Android都适用
- *
- * @author longshu 2016年4月13日
- */
- public class EncryptDecrypt {
- // 无需创建对象
- private EncryptDecrypt() {
- }
-
- /**
- * SHA1加密Bit数据
- * @param source byte数组
- * @return 加密后的byte数组
- */
- public static byte[] SHA1Bit(byte[] source) {
- try {
- MessageDigest sha1Digest = MessageDigest.getInstance("SHA-1");
- sha1Digest.update(source);
- byte targetDigest[] = sha1Digest.digest();
- return targetDigest;
- } catch (NoSuchAlgorithmException e) {
- throw new RuntimeException(e);
- }
- }
-
- /**
- * SHA1加密字符串数据
- * @param source 要加密的字符串
- * @return 加密后的字符串
- */
- public static String SHA1(String source) {
- return byte2HexStr(SHA1Bit(source.getBytes()));
- }
-
- /**
- * MD5加密Bit数据
- * @param source byte数组
- * @return 加密后的byte数组
- */
- public static byte[] MD5Bit(byte[] source) {
- try {
- // 获得MD5摘要算法的 MessageDigest对象
- MessageDigest md5Digest = MessageDigest.getInstance("MD5");
- // 使用指定的字节更新摘要
- md5Digest.update(source);
- // 获得密文
- return md5Digest.digest();
- } catch (NoSuchAlgorithmException e) {
- throw new RuntimeException(e);
- }
- }
-
- /**
- * MD5加密字符串,32位长
- * @param source 要加密的内容
- * @return 加密后的内容
- */
- public static String MD5(String source) {
- return byte2HexStr(MD5Bit(source.getBytes()));
- }
-
- /**
- * BASE64编码
- * @param source 要编码的字符串
- * @return 编码过的字符串
- */
- public static String encodeBASE64(String source) {
- Class<?> clazz = null;
- Method encodeMethod = null;
- try {// 优先使用第三方库
- clazz = Class.forName("org.apache.commons.codec.binary.Base64");
- encodeMethod = clazz.getMethod("encodeBase64", byte[].class);
- System.out.println("encodeBASE64-->" + clazz);
- System.out.println("encodeMethod-->" + encodeMethod);
- // 反射方法 静态方法执行无需对象
- return new String((byte[]) encodeMethod.invoke(null, source.getBytes()));
- } catch (ClassNotFoundException e) {
- String vm = System.getProperty("java.vm.name");
- System.out.println(vm);
- try {
- if ("Dalvik".equals(vm)) {// Android
- clazz = Class.forName("android.util.Base64");
- // byte[] Base64.encode(byte[] input,int flags)
- encodeMethod = clazz.getMethod("encode", byte[].class, int.class);
- System.out.println("encodeBASE64-->" + clazz);
- System.out.println("encodeMethod-->" + encodeMethod);
- return new String((byte[]) encodeMethod.invoke(null, source.getBytes(), 0));
- } else {// JavaSE/JavaEE
- clazz = Class.forName("sun.misc.BASE64Encoder");
- encodeMethod = clazz.getMethod("encode", byte[].class);
- System.out.println("encodeBASE64-->" + clazz);
- System.out.println("encodeMethod-->" + encodeMethod);
- return (String) encodeMethod.invoke(clazz.newInstance(), source.getBytes());
- }
- } catch (ClassNotFoundException e1) {
- return null;
- } catch (Exception e1) {
- return null;
- }
- } catch (Exception e) {
- return null;
- }
- /*
- * Android
- * android.util.Base64
- */
- // return Base64.encodeToString(source, Base64.DEFAULT);
- // return new String(Base64.encode(source.getBytes(), Base64.DEFAULT));
-
- /*
- * JavaSE/JavaEE
- */
- // sun.misc.BASE64Encoder
- // BASE64Encoder encoder = new BASE64Encoder();
- // return encoder.encode(source.getBytes());
-
- // org.apache.commons.codec.binary.Base64
- // return new String(Base64.encodeBase64(source.getBytes()));
- }
-
- /**
- * BASE64解码
- * @param encodeSource 编码过的字符串
- * @return 编码前的字符串
- */
- public static String decodeBASE64(String encodeSource) {
- Class<?> clazz = null;
- Method decodeMethod = null;
-
- try {// 优先使用第三方库
- clazz = Class.forName("org.apache.commons.codec.binary.Base64");
- decodeMethod = clazz.getMethod("decodeBase64", byte[].class);
- System.out.println("decodeBASE64-->" + clazz);
- System.out.println("decodeMethod-->" + decodeMethod);
- // 反射方法 静态方法执行无需对象
- return new String((byte[]) decodeMethod.invoke(null, encodeSource.getBytes()));
- } catch (ClassNotFoundException e) {
- String vm = System.getProperty("java.vm.name");
- System.out.println(vm);
- try {
- if ("Dalvik".equals(vm)) {// Android
- clazz = Class.forName("android.util.Base64");
- // byte[] Base64.decode(byte[] input, int flags)
- decodeMethod = clazz.getMethod("decode", byte[].class, int.class);
- System.out.println("decodeBASE64-->" + clazz);
- System.out.println("decodeMethod-->" + decodeMethod);
- return new String((byte[]) decodeMethod.invoke(null, encodeSource.getBytes(), 0));
- } else { // JavaSE/JavaEE
- clazz = Class.forName("sun.misc.BASE64Decoder");
- decodeMethod = clazz.getMethod("decodeBuffer", String.class);
- System.out.println("decodeBASE64-->" + clazz);
- System.out.println("decodeMethod-->" + decodeMethod);
- return new String((byte[]) decodeMethod.invoke(clazz.newInstance(), encodeSource));
- }
- } catch (ClassNotFoundException e1) {
- return null;
- } catch (Exception e1) {
- return null;
- }
- } catch (Exception e) {
- return null;
- }
- /*
- * Android
- * android.util.Base64
- */
- // return new
- // String(Base64.decode(encodeSource.getBytes(),Base64.DEFAULT));
-
- /*
- * JavaSE/JavaEE
- */
- // sun.misc.BASE64Decoder
- // try {
- // BASE64Decoder decoder = new BASE64Decoder();
- // return new String(decoder.decodeBuffer(encodeSource));
- // } catch (IOException e) {
- // throw new RuntimeException(e);
- // }
-
- // org.apache.commons.codec.binary.Base64
- // return new String(Base64.decodeBase64(encodeSource.getBytes()));
- }
-
- /**
- * AES加密
- * @param content 待加密的内容
- * @param password 加密密码
- * @return
- */
- public static byte[] encryptBitAES(byte[] content, String password) {
- try {
- Cipher encryptCipher = Cipher.getInstance("AES/ECB/PKCS5Padding");// 创建密码器
- encryptCipher.init(Cipher.ENCRYPT_MODE, getKey(password));// 初始化
- byte[] result = encryptCipher.doFinal(content);
- return result; // 加密
- } catch (NoSuchAlgorithmException e) {
- e.printStackTrace();
- } catch (NoSuchPaddingException e) {
- e.printStackTrace();
- } catch (InvalidKeyException e) {
- e.printStackTrace();
- } catch (IllegalBlockSizeException e) {
- e.printStackTrace();
- } catch (BadPaddingException e) {
- e.printStackTrace();
- }
- return null;
- }
-
- /**
- * AES解密
- * @param content 待解密内容
- * @param password 解密密钥
- * @return
- */
- public static byte[] decryptBitAES(byte[] content, String password) {
- try {
- Cipher decryptCipher = Cipher.getInstance("AES/ECB/PKCS5Padding");// 创建密码器
- decryptCipher.init(Cipher.DECRYPT_MODE, getKey(password));// 初始化
- byte[] result = decryptCipher.doFinal(content);
- return result; // 加密结果
- } catch (InvalidKeyException e) {
- e.printStackTrace();
- } catch (NoSuchAlgorithmException e) {
- e.printStackTrace();
- } catch (NoSuchPaddingException e) {
- e.printStackTrace();
- } catch (IllegalBlockSizeException e) {
- e.printStackTrace();
- } catch (BadPaddingException e) {
- e.printStackTrace();
- }
- return null;
- }
-
- /**
- * AES字符串加密
- * @param content 待加密的内容
- * @param password 加密密码
- * @return
- */
- public static String encryptAES(String content, String password) {
- return byte2HexStr(encryptBitAES(content.getBytes(), password));
- }
-
- /**
- * AES字符串解密
- * @param content 待解密内容
- * @param password 解密密钥
- * @return
- */
- public static String decryptAES(String content, String password) {
- return new String(decryptBitAES(hexStr2Bytes(content), password));
- }
-
- /**
- * 从指定字符串生成密钥
- * @param password 构成该秘钥的字符串
- * @return 生成的密钥
- * @throws NoSuchAlgorithmException
- */
- private static Key getKey(String password) throws NoSuchAlgorithmException {
- SecureRandom secureRandom = new SecureRandom(password.getBytes());
- // 生成KEY
- KeyGenerator kgen = KeyGenerator.getInstance("AES");
- kgen.init(128, secureRandom);
- SecretKey secretKey = kgen.generateKey();
- byte[] enCodeFormat = secretKey.getEncoded();
- // 转换KEY
- SecretKeySpec key = new SecretKeySpec(enCodeFormat, "AES");
- return key;
- }
-
- /**
- * 将byte数组转换为表示16进制值的字符串.
- * 如:byte[]{8,18}转换为:0812
- * 和 byte[] hexStr2Bytes(String strIn) 互为可逆的转换过程.
- * @param bytes 需要转换的byte数组
- * @return 转换后的字符串
- */
- public static String byte2HexStr(byte[] bytes) {
- int bytesLen = bytes.length;
- // 每个byte用两个字符才能表示,所以字符串的长度是数组长度的两倍
- StringBuffer hexString = new StringBuffer(bytesLen * 2);
- for (int i = 0; i < bytesLen; i++) {
- // 将每个字节与0xFF进行与运算,然后转化为10进制,然后借助于Integer再转化为16进制
- String hex = Integer.toHexString(bytes[i] & 0xFF);
- if (hex.length() < 2) {
- hexString.append(0);// 如果为1位 前面补个0
- }
- hexString.append(hex);
- }
- return hexString.toString();
- }
-
- /**
- * 将表示16进制值的字符串转换为byte数组,
- * 和 String byte2HexStr(byte[] bytes) 互为可逆的转换过程.
- * @param bytes
- * @return 转换后的byte数组
- */
- public static byte[] hexStr2Bytes(String strIn) {
- byte[] arrB = strIn.getBytes();
- int iLen = arrB.length;
-
- // 两个字符表示一个字节,所以字节数组长度是字符串长度除以2
- byte[] arrOut = new byte[iLen / 2];
- for (int i = 0; i < iLen; i = i + 2) {
- String strTmp = new String(arrB, i, 2);
- arrOut[i / 2] = (byte) Integer.parseInt(strTmp, 16);
- }
- return arrOut;
- }
-
- }
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