package com.qianmi.weidian.common.util;

import java.io.ByteArrayOutputStream;

import java.security.Key;

import java.security.KeyFactory;

import java.security.KeyPair;

import java.security.KeyPairGenerator;

import java.security.PrivateKey;

import java.security.PublicKey;

import java.security.Signature;

import java.security.interfaces.RSAPrivateKey;

import java.security.interfaces.RSAPublicKey;

import java.security.spec.PKCS8EncodedKeySpec;

import java.security.spec.X509EncodedKeySpec;

import java.util.HashMap;

import java.util.Map;

import javax.crypto.Cipher;

/** *//**

 * <p>

 * RSA公钥/私钥/签名工具包

 * </p>

 * <p>

 * 罗纳德·李维斯特（Ron [R]ivest）、阿迪·萨莫尔（Adi [S]hamir）和伦纳德·阿德曼（Leonard [A]dleman）

 * </p>

 * <p>

 * 字符串格式的密钥在未在特殊说明情况下都为BASE64编码格式<br/>

 * 由于非对称加密速度极其缓慢，一般文件不使用它来加密而是使用对称加密，<br/>

 * 非对称加密算法可以用来对对称加密的密钥加密，这样保证密钥的安全也就保证了数据的安全

 * </p>

 *

 * @author IceWee

 * @date 2012-4-26

 * @version 1.0

 */

public class RSAUtils {

    /** *//**

     * 加密算法RSA

     */

    public static final String KEY_ALGORITHM = "RSA";

    /** *//**

     * 签名算法

     */

    public static final String SIGNATURE_ALGORITHM = "MD5withRSA";

    /** *//**

     * 获取公钥的key

     */

    private static final String PUBLIC_KEY = "RSAPublicKey";

    /** *//**

     * 获取私钥的key

     */

    private static final String PRIVATE_KEY = "RSAPrivateKey";

    /** *//**

     * RSA最大加密明文大小

     */

    private static final int MAX_ENCRYPT_BLOCK = 117;

    /** *//**

     * RSA最大解密密文大小

     */

    private static final int MAX_DECRYPT_BLOCK = 128;

    /** *//**

     * <p>

     * 生成密钥对(公钥和私钥)

     * </p>

     *

     * @return

     * @throws Exception

     */

    public static Map<String, Object> genKeyPair() throws Exception {

        KeyPairGenerator keyPairGen = KeyPairGenerator.getInstance(KEY_ALGORITHM);

        keyPairGen.initialize(1024);

        KeyPair keyPair = keyPairGen.generateKeyPair();

        RSAPublicKey publicKey = (RSAPublicKey) keyPair.getPublic();

        RSAPrivateKey privateKey = (RSAPrivateKey) keyPair.getPrivate();

        Map<String, Object> keyMap = new HashMap<String, Object>(2);

        keyMap.put(PUBLIC_KEY, publicKey);

        keyMap.put(PRIVATE_KEY, privateKey);

        return keyMap;

    }

    /** *//**

     * <p>

     * 用私钥对信息生成数字签名

     * </p>

     *

     * @param data 已加密数据

     * @param privateKey 私钥(BASE64编码)

     *

     * @return

     * @throws Exception

     */

    public static String sign(byte[] data, String privateKey) throws Exception {

        byte[] keyBytes = Base64Util.decodeString(privateKey);

        PKCS8EncodedKeySpec pkcs8KeySpec = new PKCS8EncodedKeySpec(keyBytes);

        KeyFactory keyFactory = KeyFactory.getInstance(KEY_ALGORITHM);

        PrivateKey privateK = keyFactory.generatePrivate(pkcs8KeySpec);

        Signature signature = Signature.getInstance(SIGNATURE_ALGORITHM);

        signature.initSign(privateK);

        signature.update(data);

        return Base64Util.encodeByte(signature.sign());

    }

    /** *//**

     * <p>

     * 校验数字签名

     * </p>

     *

     * @param data 已加密数据

     * @param publicKey 公钥(BASE64编码)

     * @param sign 数字签名

     *

     * @return

     * @throws Exception

     *

     */

    public static boolean verify(byte[] data, String publicKey, String sign)

            throws Exception {

        byte[] keyBytes = Base64Util.decodeString(publicKey);

        X509EncodedKeySpec keySpec = new X509EncodedKeySpec(keyBytes);

        KeyFactory keyFactory = KeyFactory.getInstance(KEY_ALGORITHM);

        PublicKey publicK = keyFactory.generatePublic(keySpec);

        Signature signature = Signature.getInstance(SIGNATURE_ALGORITHM);

        signature.initVerify(publicK);

        signature.update(data);

        return signature.verify(Base64Util.decodeString(sign));

    }

    /** *//**

     * <P>

     * 私钥解密

     * </p>

     *

     * @param encryptedData 已加密数据

     * @param privateKey 私钥(BASE64编码)

     * @return

     * @throws Exception

     */

    public static byte[] decryptByPrivateKey(byte[] encryptedData, String privateKey)

            throws Exception {

        byte[] keyBytes = Base64Util.decodeString(privateKey);

        PKCS8EncodedKeySpec pkcs8KeySpec = new PKCS8EncodedKeySpec(keyBytes);

        KeyFactory keyFactory = KeyFactory.getInstance(KEY_ALGORITHM);

        Key privateK = keyFactory.generatePrivate(pkcs8KeySpec);

        Cipher cipher = Cipher.getInstance(keyFactory.getAlgorithm());

        cipher.init(Cipher.DECRYPT_MODE, privateK);

        int inputLen = encryptedData.length;

        ByteArrayOutputStream out = new ByteArrayOutputStream();

        int offSet = 0;

        byte[] cache;

        int i = 0;

        // 对数据分段解密

        while (inputLen - offSet > 0) {

            if (inputLen - offSet > MAX_DECRYPT_BLOCK) {

                cache = cipher.doFinal(encryptedData, offSet, MAX_DECRYPT_BLOCK);

            } else {

                cache = cipher.doFinal(encryptedData, offSet, inputLen - offSet);

            }

            out.write(cache, 0, cache.length);

            i++;

            offSet = i * MAX_DECRYPT_BLOCK;

        }

        byte[] decryptedData = out.toByteArray();

        out.close();

        return decryptedData;

    }

    /** *//**

     * <p>

     * 公钥解密

     * </p>

     *

     * @param encryptedData 已加密数据

     * @param publicKey 公钥(BASE64编码)

     * @return

     * @throws Exception

     */

    public static byte[] decryptByPublicKey(byte[] encryptedData, String publicKey)

            throws Exception {

        byte[] keyBytes = Base64Util.decodeString(publicKey);

        X509EncodedKeySpec x509KeySpec = new X509EncodedKeySpec(keyBytes);

        KeyFactory keyFactory = KeyFactory.getInstance(KEY_ALGORITHM);

        Key publicK = keyFactory.generatePublic(x509KeySpec);

        Cipher cipher = Cipher.getInstance(keyFactory.getAlgorithm());

        cipher.init(Cipher.DECRYPT_MODE, publicK);

        int inputLen = encryptedData.length;

        ByteArrayOutputStream out = new ByteArrayOutputStream();

        int offSet = 0;

        byte[] cache;

        int i = 0;

        // 对数据分段解密

        while (inputLen - offSet > 0) {

            if (inputLen - offSet > MAX_DECRYPT_BLOCK) {

                cache = cipher.doFinal(encryptedData, offSet, MAX_DECRYPT_BLOCK);

            } else {

                cache = cipher.doFinal(encryptedData, offSet, inputLen - offSet);

            }

            out.write(cache, 0, cache.length);

            i++;

            offSet = i * MAX_DECRYPT_BLOCK;

        }

        byte[] decryptedData = out.toByteArray();

        out.close();

        return decryptedData;

    }

    /** *//**

     * <p>

     * 公钥加密

     * </p>

     *

     * @param data 源数据

     * @param publicKey 公钥(BASE64编码)

     * @return

     * @throws Exception

     */

    public static byte[] encryptByPublicKey(byte[] data, String publicKey)

            throws Exception {

        byte[] keyBytes = Base64Util.decodeString(publicKey);

        X509EncodedKeySpec x509KeySpec = new X509EncodedKeySpec(keyBytes);

        KeyFactory keyFactory = KeyFactory.getInstance(KEY_ALGORITHM);

        Key publicK = keyFactory.generatePublic(x509KeySpec);

        // 对数据加密

        Cipher cipher = Cipher.getInstance(keyFactory.getAlgorithm());

        cipher.init(Cipher.ENCRYPT_MODE, publicK);

        int inputLen = data.length;

        ByteArrayOutputStream out = new ByteArrayOutputStream();

        int offSet = 0;

        byte[] cache;

        int i = 0;

        // 对数据分段加密

        while (inputLen - offSet > 0) {

            if (inputLen - offSet > MAX_ENCRYPT_BLOCK) {

                cache = cipher.doFinal(data, offSet, MAX_ENCRYPT_BLOCK);

            } else {

                cache = cipher.doFinal(data, offSet, inputLen - offSet);

            }

            out.write(cache, 0, cache.length);

            i++;

            offSet = i * MAX_ENCRYPT_BLOCK;

        }

        byte[] encryptedData = out.toByteArray();

        out.close();

        return encryptedData;

    }

    /** *//**

     * <p>

     * 私钥加密

     * </p>

     *

     * @param data 源数据

     * @param privateKey 私钥(BASE64编码)

     * @return

     * @throws Exception

     */

    public static byte[] encryptByPrivateKey(byte[] data, String privateKey)

            throws Exception {

        byte[] keyBytes = Base64Util.decodeString(privateKey);

        PKCS8EncodedKeySpec pkcs8KeySpec = new PKCS8EncodedKeySpec(keyBytes);

        KeyFactory keyFactory = KeyFactory.getInstance(KEY_ALGORITHM);

        Key privateK = keyFactory.generatePrivate(pkcs8KeySpec);

        Cipher cipher = Cipher.getInstance(keyFactory.getAlgorithm());

        cipher.init(Cipher.ENCRYPT_MODE, privateK);

        int inputLen = data.length;

        ByteArrayOutputStream out = new ByteArrayOutputStream();

        int offSet = 0;

        byte[] cache;

        int i = 0;

        // 对数据分段加密

        while (inputLen - offSet > 0) {

            if (inputLen - offSet > MAX_ENCRYPT_BLOCK) {

                cache = cipher.doFinal(data, offSet, MAX_ENCRYPT_BLOCK);

            } else {

                cache = cipher.doFinal(data, offSet, inputLen - offSet);

            }

            out.write(cache, 0, cache.length);

            i++;

            offSet = i * MAX_ENCRYPT_BLOCK;

        }

        byte[] encryptedData = out.toByteArray();

        out.close();

        return encryptedData;

    }

    /** *//**

     * <p>

     * 获取私钥

     * </p>

     *

     * @param keyMap 密钥对

     * @return

     * @throws Exception

     */

    public static String getPrivateKey(Map<String, Object> keyMap)

            throws Exception {

        Key key = (Key) keyMap.get(PRIVATE_KEY);

        return Base64Util.encodeByte(key.getEncoded());

    }

    /** *//**

     * <p>

     * 获取公钥

     * </p>

     *

     * @param keyMap 密钥对

     * @return

     * @throws Exception

     */

    public static String getPublicKey(Map<String, Object> keyMap)

            throws Exception {

        Key key = (Key) keyMap.get(PUBLIC_KEY);

        return Base64Util.encodeByte(key.getEncoded());

    }

}
package com.qianmi.weidian.common.util;

import sun.misc.BASE64Encoder;

import javax.crypto.Cipher;

import java.io.ByteArrayOutputStream;

import java.security.*;

import java.security.spec.X509EncodedKeySpec;

/** */

/**

 * <p>

 * RSA公钥/私钥/签名工具包

 * </p>

 * <p>

 * 罗纳德·李维斯特（Ron [R]ivest）、阿迪·萨莫尔（Adi [S]hamir）和伦纳德·阿德曼（Leonard [A]dleman）

 * </p>

 * <p>

 * 字符串格式的密钥在未在特殊说明情况下都为BASE64编码格式<br/>

 * 由于非对称加密速度极其缓慢，一般文件不使用它来加密而是使用对称加密，<br/>

 * 非对称加密算法可以用来对对称加密的密钥加密，这样保证密钥的安全也就保证了数据的安全

 * </p>

 *

 * @author IceWee

 * @date 2012-4-26

 * @version 1.0

 */

public class RSAUtils4Client {

    static String privateKey="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";

    /** *//**

     * 加密算法RSA

     */

    public static final String KEY_ALGORITHM = "RSA";

    /** *//**

     * RSA最大加密明文大小

     */

    private static final int MAX_ENCRYPT_BLOCK = 117;

    /** *//**

     * <p>

     * 公钥加密

     * </p>

     *

     * @param data 源数据

     * @param publicKey 公钥(BASE64编码)

     * @return

     * @throws Exception

     */

    public static byte[] encryptByPublicKey(byte[] data, String publicKey)

            throws Exception {

        byte[] keyBytes = Base64Util.decodeString(publicKey);

        X509EncodedKeySpec x509KeySpec = new X509EncodedKeySpec(keyBytes);

        KeyFactory keyFactory = KeyFactory.getInstance(KEY_ALGORITHM);

        Key publicK = keyFactory.generatePublic(x509KeySpec);

        // 对数据加密

        Cipher cipher = Cipher.getInstance(keyFactory.getAlgorithm());

        cipher.init(Cipher.ENCRYPT_MODE, publicK);

        int inputLen = data.length;

        ByteArrayOutputStream out = new ByteArrayOutputStream();

        int offSet = 0;

        byte[] cache;

        int i = 0;

        // 对数据分段加密

        while (inputLen - offSet > 0) {

            if (inputLen - offSet > MAX_ENCRYPT_BLOCK) {

                cache = cipher.doFinal(data, offSet, MAX_ENCRYPT_BLOCK);

            } else {

                cache = cipher.doFinal(data, offSet, inputLen - offSet);

            }

            out.write(cache, 0, cache.length);

            i++;

            offSet = i * MAX_ENCRYPT_BLOCK;

        }

        byte[] encryptedData = out.toByteArray();

        out.close();

        return encryptedData;

    }

    public static void main(String[] args) throws Exception {

        String source = "这是一行测试RSA数字签名的无意义文字";

        System.out.println("原文字：\r\n" + source);

        byte[] data = source.getBytes();

        byte[] encodedData = RSAUtils.encryptByPrivateKey(data, privateKey);

        System.out.println("加密后：\r\n" + new String(encodedData));

        String base64EncodedData = Base64Util.encodeByte(encodedData);

        //System.out.println("加密后BASE64：\r\n" + base64EncodedData);

        System.out.println("加密后BASE64：\r\n" + new BASE64Encoder().encode(encodedData));

    }

}

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