java中常用的加密工具類

1.項目中引入jar包

javabase64-1.3.1.jar

2.如果是springboot項目，若在maven中不知道遠程路徑，可以按照如下方式操作；

2.1可以直接下載jar,

2.2在項目的src平級目錄下創建一個lib backage

2.3 在pom.xml

<dependency><groupId>it.sauronsoftware.base64</groupId><artifactId>base64</artifactId><version>1.3.1</version><scope>system</scope><systemPath>${basedir}/lib/javabase64-1.3.1.jar</systemPath>
</dependency>

這樣就可以引入了。

3.轉入正題，我們來講加密工具類

AESUtils

package com.foxconn.oem.common.utils.safe;import javax.crypto.*;
import javax.crypto.spec.SecretKeySpec;
import java.io.*;
import java.security.Key;
import java.security.SecureRandom;/*** <p>* AES加密解密工具包* </p>* * @author F3851884 XHB* @date 2012-5-18* @version 1.0*/
public class AESUtils {public static final String ALGORITHM = "AES";public static final int KEY_SIZE = 128;public static final int CACHE_SIZE = 1024;public static final String CODE = "utf-8";/*** <p>* 生成随机密钥* </p>* * @return* @throws Exception*/public static String getSecretKey() throws Exception {return getSecretKey(null);}/*** <p>* 生成密钥* </p>* * @param seed 密钥种子* @return* @throws Exception*/public static String getSecretKey(String seed) throws Exception {KeyGenerator keyGenerator = KeyGenerator.getInstance(ALGORITHM);SecureRandom secureRandom;if (seed != null && !"".equals(seed)) {//此种写法Windows上正常，Linux上异常//secureRandom = new SecureRandom(seed.getBytes());secureRandom = SecureRandom.getInstance("SHA1PRNG");secureRandom.setSeed(seed.getBytes());} else {secureRandom = new SecureRandom();}keyGenerator.init(KEY_SIZE, secureRandom); SecretKey secretKey = keyGenerator.generateKey(); return Base64Utils.encode(secretKey.getEncoded());}/*** <p>* 加密* </p>** @param key* @return* @throws Exception*/public static String encrypt(String content, String key) throws Exception {if(content==null)content="";byte[] byteContent = content.getBytes(CODE);Key k = toKey(Base64Utils.decode(key));byte[] raw = k.getEncoded(); SecretKeySpec secretKeySpec = new SecretKeySpec(raw, ALGORITHM); Cipher cipher = Cipher.getInstance(ALGORITHM); cipher.init(Cipher.ENCRYPT_MODE, secretKeySpec);byte[] result =cipher.doFinal(byteContent);//通过Base64转码返回return Base64Utils.encode(result);}/*** <p>* 文件加密* </p>* * @param key* @param sourceFilePath* @param destFilePath* @throws Exception*/public static void encryptFile(String key, String sourceFilePath, String destFilePath) throws Exception {InputStream in = null;OutputStream out = null;CipherInputStream cin = null;try {File sourceFile = new File(sourceFilePath);File destFile = new File(destFilePath);if (sourceFile.exists() && sourceFile.isFile()) {if (!destFile.getParentFile().exists()) {destFile.getParentFile().mkdirs();}destFile.createNewFile();in = new FileInputStream(sourceFile);out = new FileOutputStream(destFile);Key k = toKey(Base64Utils.decode(key));byte[] raw = k.getEncoded();SecretKeySpec secretKeySpec = new SecretKeySpec(raw, ALGORITHM);Cipher cipher = Cipher.getInstance(ALGORITHM);cipher.init(Cipher.ENCRYPT_MODE, secretKeySpec);cin = new CipherInputStream(in, cipher);byte[] cache = new byte[CACHE_SIZE];int nRead = 0;while ((nRead = cin.read(cache)) != -1) {out.write(cache, 0, nRead);out.flush();}}}catch (Exception e){e.printStackTrace();}finally {if(out != null){try {out.close();}catch (Exception e){}}if(cin != null){try {cin.close();}catch (Exception e){}}if(in != null){try {in.close();}catch (Exception e){}}}}/*** <p>* 解密* </p>** @param key* @return* @throws Exception*/public static String decrypt(String content, String key) throws Exception {Key k = toKey(Base64Utils.decode(key));byte[] raw = k.getEncoded(); SecretKeySpec secretKeySpec = new SecretKeySpec(raw, ALGORITHM); Cipher cipher = Cipher.getInstance(ALGORITHM); cipher.init(Cipher.DECRYPT_MODE, secretKeySpec);byte[] result = cipher.doFinal(Base64Utils.decode(content));return new String(result, CODE);}/*** <p>* 文件解密* </p>* * @param key* @param sourceFilePath* @param destFilePath* @throws Exception*/public static void decryptFile(String key, String sourceFilePath, String destFilePath) throws Exception {FileInputStream in = null;FileOutputStream out = null;CipherOutputStream cout = null;try {File sourceFile = new File(sourceFilePath);File destFile = new File(destFilePath);if (sourceFile.exists() && sourceFile.isFile()) {if (!destFile.getParentFile().exists()) {destFile.getParentFile().mkdirs();}destFile.createNewFile();in = new FileInputStream(sourceFile);out = new FileOutputStream(destFile);Key k = toKey(Base64Utils.decode(key));byte[] raw = k.getEncoded();SecretKeySpec secretKeySpec = new SecretKeySpec(raw, ALGORITHM);Cipher cipher = Cipher.getInstance(ALGORITHM);cipher.init(Cipher.DECRYPT_MODE, secretKeySpec);cout = new CipherOutputStream(out, cipher);byte[] cache = new byte[CACHE_SIZE];int nRead = 0;while ((nRead = in.read(cache)) != -1) {cout.write(cache, 0, nRead);cout.flush();}}}catch (Exception e){e.printStackTrace();}finally {if(cout != null){try {cout.close();}catch (Exception e){}}if(out != null){try {out.close();}catch (Exception e){}}if(in != null){try {in.close();}catch (Exception e){}}}}/*** <p>* 转换密钥* </p>* * @param key* @return* @throws Exception*/public static Key toKey(byte[] key) throws Exception {SecretKey secretKey = new SecretKeySpec(key, ALGORITHM);return secretKey;}}

3.1

package com.foxconn.oem.common.utils.safe;import it.sauronsoftware.base64.Base64;import java.io.*;/**
* <p>
* BASE64编码解码工具包
* </p>
* <p>
* 依赖javabase64-1.3.1.jar
* </p>
*
* @author F3851884 XHB
* @date 2012-5-19
* @version 1.0
*/
public class Base64Utils {/*** 文件读取缓冲区大小*/private static final int CACHE_SIZE = 1024;/*** <p>* BASE64字符串解码为二进制数据* </p>** @param base64* @return* @throws Exception*/public static byte[] decode(String base64) throws Exception {return Base64.decode(base64.getBytes());}/*** <p>* 二进制数据编码为BASE64字符串* </p>** @param bytes* @return* @throws Exception*/public static String encode(byte[] bytes) throws Exception {return new String(Base64.encode(bytes));}/*** <p>* 将文件编码为BASE64字符串* </p>* <p>* 大文件慎用，可能会导致内存溢出* </p>** @param filePath 文件绝对路径* @return* @throws Exception*/public static String encodeFile(String filePath) throws Exception {byte[] bytes = fileToByte(filePath);return encode(bytes);}/*** <p>* BASE64字符串转回文件* </p>** @param filePath 文件绝对路径* @param base64 编码字符串* @throws Exception*/public static void decodeToFile(String filePath, String base64) throws Exception {byte[] bytes = decode(base64);byteArrayToFile(bytes, filePath);}/*** <p>* 文件转换为二进制数组* </p>** @param filePath 文件路径* @return* @throws Exception*/public static byte[] fileToByte(String filePath) throws Exception {byte[] data = new byte[0];FileInputStream in = null;ByteArrayOutputStream out = null;try {File file = new File(filePath);if (file.exists()) {in = new FileInputStream(file);out = new ByteArrayOutputStream(2048);byte[] cache = new byte[CACHE_SIZE];int nRead = 0;while ((nRead = in.read(cache)) != -1) {out.write(cache, 0, nRead);out.flush();}data = out.toByteArray();}}catch (Exception e){e.printStackTrace();}finally {if(out != null){try {out.close();}catch (Exception e){}}if(in != null){try {in.close();}catch (Exception e){}}}return data;}/*** <p>* 二进制数据写文件* </p>** @param bytes 二进制数据* @param filePath 文件生成目录*/public static void byteArrayToFile(byte[] bytes, String filePath) throws Exception {InputStream in = null;OutputStream out = null;try {in = new ByteArrayInputStream(bytes);File destFile = new File(filePath);if (!destFile.getParentFile().exists()) {destFile.getParentFile().mkdirs();}destFile.createNewFile();out = new FileOutputStream(destFile);byte[] cache = new byte[CACHE_SIZE];int nRead = 0;while ((nRead = in.read(cache)) != -1) {out.write(cache, 0, nRead);out.flush();}}catch (Exception e){e.printStackTrace();}finally {if(out != null){try {out.close();}catch (Exception e){}}if(in != null){try {in.close();}catch (Exception e){}}}}}

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