以下为加密的工具类：
import java.io.UnsupportedEncodingException;
import java.security.InvalidKeyException;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.security.PrivateKey;
import java.security.PublicKey;
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 com.sun.mail.util.BASE64DecoderStream;
import com.sun.mail.util.BASE64EncoderStream;public class util {
/**
* 传入名文和公钥钥对数据进行RSA解密
* <br>生成时间：2014年5月2日 下午2:38:13
* <br>返回值：String
* <br>@param src
* <br>@param pubkey
* <br>@return
*/
public static String rsaEncoding(String src,PublicKey pubkey){
try {
Cipher cip = Cipher.getInstance("RSA");
cip.init(cip.ENCRYPT_MODE, pubkey);
byte[] by = cip.doFinal(src.getBytes());
return new String(BASE64EncoderStream.encode(by));} catch (NoSuchAlgorithmException e) {
throw new RuntimeException(e);
} catch (NoSuchPaddingException e) {
throw new RuntimeException(e);
} catch (InvalidKeyException e) {
throw new RuntimeException(e);
} catch (IllegalBlockSizeException e) {
throw new RuntimeException(e);
} catch (BadPaddingException e) {
throw new RuntimeException(e);
}}
/**
* 传入RSA密文和私钥对数据进行解密
* <br>生成时间：2014年5月2日 下午2:37:08
* <br>返回值：String
* <br>@param sec
* <br>@param privkey
* <br>@return
*/
public static String rsaDeEncoding(String sec,PrivateKey privkey){
try {
Cipher cip = Cipher.getInstance("RSA");
cip.init(cip.DECRYPT_MODE, privkey);
byte[] by = BASE64DecoderStream.decode(sec.getBytes());
return new String(cip.doFinal(by));} catch (NoSuchAlgorithmException e) {
throw new RuntimeException(e);
} catch (NoSuchPaddingException e) {
throw new RuntimeException(e);
} catch (InvalidKeyException e) {
throw new RuntimeException(e);
} catch (IllegalBlockSizeException e) {
throw new RuntimeException(e);
} catch (BadPaddingException e) {
throw new RuntimeException(e);
}}
/**
* 传入字符串、密钥，并加密字符串（对称加密加密），支持：DES、AES、DESede(3DES)
* <br>生成时间：2014年5月2日 下午12:05:44
* <br>返回值：String 密文
* <br>@param src
* <br>@param key
* <br>@param method(DES、AES、DESede)
* <br>@return
*/
//对称加密加密
public static String doubKeyEncoding(String src,String keysrc,String method) {
SecretKey key;
try {
//生成密钥
KeyGenerator kg = KeyGenerator.getInstance(method);
//初始化此密钥生成器。
kg.init(new SecureRandom(keysrc.getBytes("utf-8")));key = kg.generateKey();
//加密
Cipher ciph = Cipher.getInstance(method);
ciph.init(Cipher.ENCRYPT_MODE, key);
ciph.update(src.getBytes("utf-8"));
//使用64进行编码，一避免出现丢数据情景
byte[] by = BASE64EncoderStream.encode(ciph.doFinal());
return new String(by);
} catch (NoSuchAlgorithmException e) {
throw new RuntimeException(e);
} catch (NoSuchPaddingException e) {
throw new RuntimeException(e);
} catch (InvalidKeyException e) {
throw new RuntimeException(e);
} catch (IllegalBlockSizeException e) {
throw new RuntimeException(e);
} catch (BadPaddingException e) {
throw new RuntimeException(e);
} catch (UnsupportedEncodingException e) {
throw new RuntimeException(e);
}
}
/**
* 传入字符串、密钥、加密方式，并解密字符串（对称加密解密密），支持：DES、AES、DESede(3DES)
* <br>生成时间：2014年5月2日 下午1:12:13
* <br>返回值：String 密钥原文
* <br>@param sec
* <br>@param key
* <br>@param method(DES、AES、DESede)
* <br>@return
*/
public static String doubKeyDencoding(String sec,String keysrc,String method) {
SecretKey key;
try {
//生成密钥
KeyGenerator kg = KeyGenerator.getInstance(method);
//初始化此密钥生成器。
kg.init(new SecureRandom(keysrc.getBytes("utf-8")));
key = kg.generateKey();
//加密
Cipher ciph = Cipher.getInstance(method);
ciph.init(ciph.DECRYPT_MODE, key);
//使用64进行解码，一避免出现丢数据情景
byte[] by = BASE64DecoderStream.decode(sec.getBytes());
ciph.update(by);
return new String(ciph.doFinal());} catch (NoSuchAlgorithmException e) {
throw new RuntimeException(e);
} catch (NoSuchPaddingException e) {
throw new RuntimeException(e);
} catch (InvalidKeyException e) {
throw new RuntimeException(e);
} catch (IllegalBlockSizeException e) {
throw new RuntimeException(e);
} catch (BadPaddingException e) {
throw new RuntimeException(e);
} catch (UnsupportedEncodingException e) {
throw new RuntimeException(e);
}
}/**
* 单向信息加密(信息摘要)，支持：md5、md2、SHA(SHA-1，SHA1)、SHA-256、SHA-384、SHA-512,
* <br>生成时间：2014年5月2日 上午11:13:44
* <br>返回值：String 加密后的密文
* <br>@param src 传入加密字符串(明文)
* <br>@param method 指定算法(md5、md2、SHA(SHA-1，SHA1)、SHA-256、SHA-384、SHA-512)
* <br>@return
*/
public static String ecodingPasswd(String src,String method){try {
//信息摘要算法
MessageDigest md5 = MessageDigest.getInstance(method);
md5.update(src.getBytes());
byte[] encoding = md5.digest();
//使用64进行编码，一避免出现丢数据情景
return new String(BASE64EncoderStream.encode(encoding));
} catch (NoSuchAlgorithmException e) {
throw new RuntimeException(e+"加密失败！！");
}}
}
以下为测试类
import java.security.KeyPair;
import java.security.KeyPairGenerator;
import java.security.NoSuchAlgorithmException;
import java.security.PrivateKey;
import java.security.PublicKey;import org.junit.Test;
import com.shuqi.utils.util;
public class test {
@Test
public void ecoding() {
// //MD5 加密
// System.out.println("md5"+util.ecodingPasswd("shuqi", "md5"));
// System.out.println("md2"+util.ecodingPasswd("shuqi", "md2"));
// //sha加密
// System.out.println("sha"+util.ecodingPasswd("shuqi", "sha"));
// System.out.println("sha-1"+util.ecodingPasswd("shuqi", "sha-1"));
// System.out.println("sha1"+util.ecodingPasswd("shuqi", "sha1"));
// System.out.println("sha-256"+util.ecodingPasswd("shuqi", "sha-256"));
// System.out.println("sha-384"+util.ecodingPasswd("shuqi", "sha-384"));
// System.out.println("sha-512"+util.ecodingPasswd("shuqi", "sha-512"));// String mi = util.doubKeyEncoding("hehe", "shuqi", "AES");
// String ming = util.doubKeyDencoding(mi, "shuqi", "AES");
// System.out.println("ＡＥＳ加密解密");
// System.out.println("加密hehhe，密文 >>> "+mi);
// System.out.println("解密"+mi+"，明文 >>> "+ming);
//
// mi = util.doubKeyEncoding("hehe", "shuqi", "DES");
// ming = util.doubKeyDencoding(mi, "shuqi", "DES");
// System.out.println("DES加密解密");
// System.out.println("加密hehhe，密文 >>> "+mi);
// System.out.println("解密"+mi+"，明文 >>> "+ming);
//
// mi = util.doubKeyEncoding("hehe", "shuqi", "DESede");
// ming = util.doubKeyDencoding(mi, "shuqi", "DESede");
// System.out.println("DESede加密解密");
// System.out.println("加密hehhe，密文 >>> "+mi);
// System.out.println("解密"+mi+"，明文 >>> "+ming);/**
* RSA算法的验证
*/
try {
//实例化一个密钥对生成器
KeyPairGenerator kpg = KeyPairGenerator.getInstance("RSA");
//得到密钥对对象
KeyPair kp = kpg.genKeyPair();
PrivateKey prikay = kp.getPrivate();
PublicKey pubkey = kp.getPublic();String mi = util.rsaEncoding("shuqi", pubkey);
String ming = util.rsaDeEncoding(mi, prikay);
System.out.println(ming+" :: "+mi);} catch (NoSuchAlgorithmException e) {
e.printStackTrace();
}
}}
参考文章：shibenjie的博文 snowolf的博文