java中加密解密工具类
在工作中经常遇到需要加密、解密的场景。例如用户的手机号等信息,在保存到数据库的过程中,需要对数据进行加密。取出时进行解密。
public class DEStool { private String sKey; public DEStool() { //默认构造函数提供默认密钥 sKey = "des@#$12"; } public DEStool(String securityKey) { if (securityKey.length() < 8) { throw new IllegalArgumentException("密钥长度至少8位"); } this.sKey = securityKey; } private Cipher makeCipher() throws Exception{ return Cipher.getInstance("DES"); } private SecretKey makeKeyFactory() throws Exception{ SecretKeyFactory des = SecretKeyFactory.getInstance("DES"); SecretKey secretKey = des.generateSecret(new DESKeySpec(sKey.getBytes())); return secretKey; } public String encrypt(String text) throws Exception{ Cipher cipher = makeCipher(); SecretKey secretKey = makeKeyFactory(); cipher.init(Cipher.ENCRYPT_MODE, secretKey); return new String(Base64.encodeBase64(cipher.doFinal(text.getBytes()))); } public String decrypt(String text) throws Exception{ Cipher cipher = makeCipher(); SecretKey secretKey = makeKeyFactory(); cipher.init(Cipher.DECRYPT_MODE, secretKey); return new String(cipher.doFinal(Base64.decodeBase64(text.getBytes()))); } public static void main(String[] args) { DEStool tool = new DEStool("nice1234"); String content = "中国"; System.out.println("原文内容:"+content); String encrpt = null; try { encrpt = tool.encrypt(content); } catch (Exception e) { e.printStackTrace(); } System.out.println("加密后:"+encrpt + ", 长度=" + encrpt.length()); String descript =null; try { descript = tool.decrypt(encrpt); } catch (Exception e) { e.printStackTrace(); } System.out.println("解密后:" + descript); } }
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