TestDESede

//好神奇，密钥每次都不一样，但是就是能成功解密。//Cipher 是为加密和解密提供密码功能。差不多就是。。。。给密钥一个附加密码。加解密操作的时候不仅需要拿到密钥，还需要这个密码//所以上面说的密钥不一样，其实是每次的密码都不一样import java.security.Key;import javax.crypto.Cipher;import javax.crypto.KeyGenerator;import javax.crypto.SecretKey;import javax.crypto.SecretKeyFactory;import javax.crypto.spec.DESedeKeySpec;import org.apache.commons.codec.binary.Base64;public class TestDESede {public static String KEY_ALGORITHM ="DESede";public static String CIPHER_ALOGITHM ="DESede/ECB/PKCS5Padding";public static void main(String[] args) throws Exception{String s = "DESede";System.out.println("原文： " + s);byte[] key = initKey();System.out.println("密钥： " + Base64.encodeBase64String(key));byte[] afterEncrypt = encrypt(s.getBytes(), key);System.out.println("加密后:" + Base64.encodeBase64String(afterEncrypt));byte[] afterDecrypt = decrypt(afterEncrypt, key);System.out.println("解密后：" + new String(afterDecrypt));}public static byte[] initKey() throws Exception {KeyGenerator kg = KeyGenerator.getInstance(KEY_ALGORITHM);kg.init(168);SecretKey sk = kg.generateKey();return sk.getEncoded();}/** * 转换密钥 * @param key * @return * @throws Exception */public static Key toKey(byte[] key) throws Exception {//获取密钥模具，规范DESedeKeySpec dks = new DESedeKeySpec(key);//获取密钥工厂SecretKeyFactory skf = SecretKeyFactory.getInstance(KEY_ALGORITHM);//生成密钥return skf.generateSecret(dks);}public static byte[] encrypt(byte[] date, byte[] key) throws Exception {//还原密钥Key k = toKey(key);Cipher cipher = Cipher.getInstance(CIPHER_ALOGITHM);cipher.init(Cipher.ENCRYPT_MODE, k);return cipher.doFinal(date);}/** * 解密 * @param date * @param key * @return * @throws Exception */public static byte[] decrypt(byte[] date, byte[] key) throws Exception {//还原密钥Key k = toKey(key);Cipher cipher = Cipher.getInstance(CIPHER_ALOGITHM);cipher.init(Cipher.DECRYPT_MODE, k);return cipher.doFinal(date);}}