java加密算法分享(rsa解密、对称加密、md5加密)

　　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

　　*

　　返回值：String

　　*

　　@param src

　　*

　　@param pubkey

　　*

　　@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

　　*

　　返回值：String

　　*

　　@param sec

　　*

　　@param privkey

　　*

　　@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)

　　*

　　返回值：String 密文

　　*

　　@param src

　　*

　　@param key

　　*

　　@param method(DES、AES、DESede)

　　*

　　@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)

　　*

　　生成时间：2014年5月2日 下午1:12:13

　　*

　　返回值：String 密钥原文

　　*

　　@param sec

　　*

　　@param key

　　*

　　@param method(DES、AES、DESede)

　　*

　　@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);

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　　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,

　　*

　　返回值：String 加密后的密文

　　*

　　@param src 传入加密字符串(明文)

　　*

　　@param method 指定算法(md5、md2、SHA(SHA-1，SHA1)、SHA-256、SHA-384、SHA-512)

　　*

　　@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!!");

　　}

　　}

　　}