import sun.misc.BASE64Encoder; import sun.misc.BASE64Decoder; import javax.crypto.*; import javax.crypto.spec.DESKeySpec; import javax.crypto.spec.IvParameterSpec; import java.security.Key; import java.security.spec.AlgorithmParameterSpec; /** * 使用DES加密和解密的方法 */ public class CryptoTools { private final byte[] DESkey = new byte[]{58, 21, 93, -100, 78, 4, -38, 32, 15, -89, 44, 90, 26, -6, -101, -112, 2, 94, 18, -52, 119, 35, -72, -69};// 设置密钥,略去 // private final byte[] DESIV = new byte[]{-121, 39, -10, -113, 36, 99, -89, 3, 42, 8, 62, 83, -72, 4, -47, 43, -111, 39, 112, 58, -83, 10, 41, -44};// 设置向量,略去 private final byte[] DESIV = new byte[]{58, 21, 93, 93, 93, 93, 93, 93};// 设置密钥,略去 private AlgorithmParameterSpec iv = null;// 加密算法的参数接口,IvParameterSpec是它的一个实现 private Key key = null; public CryptoTools() throws Exception { SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES");// 获得密钥工厂 // 设置密钥参数,得到密钥对象 key = keyFactory.generateSecret(new DESKeySpec(DESkey));// 得到密钥对象 iv = new IvParameterSpec(DESIV);// 设置向量 } public String encode(String data) throws Exception { Cipher enCipher = Cipher.getInstance("DES/CBC/PKCS5Padding");// 得到加密对象Cipher enCipher.init(Cipher.ENCRYPT_MODE, key, iv);// 设置工作模式为加密模式,给出密钥和向量 byte[] pasByte = enCipher.doFinal(data.getBytes("utf-8")); BASE64Encoder base64Encoder = new BASE64Encoder(); return base64Encoder.encode(pasByte); } public String decode(String data) throws Exception { Cipher deCipher = Cipher.getInstance("DES/CBC/PKCS5Padding"); deCipher.init(Cipher.DECRYPT_MODE, key, iv); BASE64Decoder base64Decoder = new BASE64Decoder(); byte[] pasByte = deCipher.doFinal(base64Decoder.decodeBuffer(data)); return new String(pasByte, "UTF-8"); } public static void main(String[] args) { try { String test = "a1"; CryptoTools des = new CryptoTools();//自定义密钥 System.out.println("加密前的字符:" + test); System.out.println("加密后的字符:" + des.encode(test)); System.out.println("解密后的字符:" + des.decode(des.encode(test))); } catch (Exception e) { e.printStackTrace(); } } }
DES加密和解密的方法
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转载自zheyiw.iteye.com/blog/2392580
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