java RSA加密类，javarsa加密,import java.

java RSA加密类，javarsa加密,import java.

import java.security.KeyPair;import java.security.KeyPairGenerator;import java.security.interfaces.RSAPrivateKey;import java.security.interfaces.RSAPublicKey;import javax.crypto.Cipher;/** * RSA加密类 *  */public class RSAEncrypt {    public static void main(String[] args) {        try {            RSAEncrypt encrypt = new RSAEncrypt();            String encryptText = "12345678";            KeyPairGenerator keyPairGen = KeyPairGenerator.getInstance("RSA");            keyPairGen.initialize(1024);            KeyPair keyPair = keyPairGen.generateKeyPair();            // Generate keys            RSAPrivateKey privateKey = (RSAPrivateKey) keyPair.getPrivate(); // 私钥            RSAPublicKey publicKey = (RSAPublicKey) keyPair.getPublic(); // 公钥            byte[] e = encrypt.encrypt(publicKey, encryptText.getBytes());            byte[] de = encrypt.decrypt(privateKey, e);            System.out.println(encrypt.bytesToString(e));            System.out.println();            System.out.println(encrypt.bytesToString(de));        } catch (Exception e) {            e.printStackTrace();        }    }    /**     * byte数组转为string     *      * @param encrytpByte     * @return     */    protected String bytesToString(byte[] encrytpByte) {        String result = "";        for (Byte bytes : encrytpByte) {            result += (char) bytes.intValue();        }        return result;    }    /**     * 加密方法     *      * @param publicKey     * @param obj     * @return     */    protected byte[] encrypt(RSAPublicKey publicKey, byte[] obj) {        if (publicKey != null) {            try {                Cipher cipher = Cipher.getInstance("RSA");                cipher.init(Cipher.ENCRYPT_MODE, publicKey);                return cipher.doFinal(obj);            } catch (Exception e) {                e.printStackTrace();            }        }        return null;    }    /**     * 解密方法     *      * @param privateKey     * @param obj     * @return     */    protected byte[] decrypt(RSAPrivateKey privateKey, byte[] obj) {        if (privateKey != null) {            try {                Cipher cipher = Cipher.getInstance("RSA");                cipher.init(Cipher.DECRYPT_MODE, privateKey);                return cipher.doFinal(obj);            } catch (Exception e) {                e.printStackTrace();            }        }        return null;    }}