RSA 非对称加密算法

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RSA 非对称加密算法：import java.io.File;import java.io.FileInputStream;import java.io.FileOutputStream;import java.io.ObjectInputStream;import java.io.ObjectOutputStream;import java.security.Key;import java.security.KeyPair;import java.security.KeyPairGenerator;import javax.crypto.Cipher;import sun.misc.BASE64Decoder;import sun.misc.BASE64Encoder;@SuppressWarnings("restriction")public class RSAEncrypt {    /** 指定加密算法为RSA */    private static final String ALGORITHM = "RSA";    /** 密钥长度，用来初始化 */    private static final int KEYSIZE = 1024;    /** 指定公钥存放文件 */    private static String PUBLIC_KEY_FILE = "src/main/resources/META-INF/key/PublicKey";    /** 指定私钥存放文件 */    private static String PRIVATE_KEY_FILE = "src/main/resources/META-INF/key/PrivateKey";    /**     * 生成密钥对     *      * @throws Exception     */    @SuppressWarnings("unused")    private static void generateKeyPair() throws Exception {        // /** RSA算法要求有一个可信任的随机数源 */        // SecureRandom secureRandom = new SecureRandom();        /** 为RSA算法创建一个KeyPairGenerator对象 */        KeyPairGenerator keyPairGenerator = KeyPairGenerator.getInstance(ALGORITHM);        /** 利用上面的随机数据源初始化这个KeyPairGenerator对象 */        // keyPairGenerator.initialize(KEYSIZE, secureRandom);        keyPairGenerator.initialize(KEYSIZE);        /** 生成密匙对 */        KeyPair keyPair = keyPairGenerator.generateKeyPair();        /** 得到公钥 */        Key publicKey = keyPair.getPublic();        /** 得到私钥 */        Key privateKey = keyPair.getPrivate();        ObjectOutputStream oos1 = null;        ObjectOutputStream oos2 = null;        try {            /** 用对象流将生成的密钥写入文件 */            oos1 = new ObjectOutputStream(                    new FileOutputStream(RSAEncrypt.findProjectRootPath().concat(PUBLIC_KEY_FILE)));            oos2 = new ObjectOutputStream(                    new FileOutputStream(RSAEncrypt.findProjectRootPath().concat(PRIVATE_KEY_FILE)));            oos1.writeObject(publicKey);            oos2.writeObject(privateKey);        } catch (Exception e) {            throw e;        } finally {            /** 清空缓存，关闭文件输出流 */            oos1.close();            oos2.close();        }    }    /**     * 加密方法     *      * @param source     *            源数据     * @return     * @throws Exception     */    public static String encrypt(String source) throws Exception {        // generateKeyPair();        Key publicKey;        ObjectInputStream ois = null;        try {            /** 将文件中的公钥对象读出 */            ois = new ObjectInputStream(new FileInputStream(RSAEncrypt.findProjectRootPath().concat(PUBLIC_KEY_FILE)));            publicKey = (Key) ois.readObject();        } catch (Exception e) {            throw e;        } finally {            ois.close();        }        /** 得到Cipher对象来实现对源数据的RSA加密 */        Cipher cipher = Cipher.getInstance(ALGORITHM);        cipher.init(Cipher.ENCRYPT_MODE, publicKey);        byte[] b = source.getBytes();        /** 执行加密操作 */        byte[] b1 = cipher.doFinal(b);        BASE64Encoder encoder = new BASE64Encoder();        return encoder.encode(b1);    }    /**     * 解密算法     *      * @param cryptograph     *            密文     * @return     * @throws Exception     */    public static String decrypt(String cryptograph) throws Exception {        Key privateKey;        ObjectInputStream ois = null;        try {            /** 将文件中的私钥对象读出 */            ois = new ObjectInputStream(new FileInputStream(RSAEncrypt.findProjectRootPath().concat(PRIVATE_KEY_FILE)));            privateKey = (Key) ois.readObject();        } catch (Exception e) {            throw e;        } finally {            ois.close();        }        /** 得到Cipher对象对已用公钥加密的数据进行RSA解密 */        Cipher cipher = Cipher.getInstance(ALGORITHM);        cipher.init(Cipher.DECRYPT_MODE, privateKey);        BASE64Decoder decoder = new BASE64Decoder();        byte[] b1 = decoder.decodeBuffer(cryptograph);        /** 执行解密操作 */        byte[] b = cipher.doFinal(b1);        return new String(b);    }    public static String findProjectRootPath() {        /*         * This method in the jar package access path is not correct         */        // RSAEncrypt encrypt = new RSAEncrypt();        // String path =        // encrypt.getClass().getResource("").toString().replace("file:/", "");        // path = path.substring(0, path.indexOf("live/target") + 5);        /*         * This method is based on the current file to obtain an absolute         * address         *          */        return new File("").getAbsolutePath().replaceAll("\\\\", "//").concat("/");    };
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