某開發平臺的注冊機，花了我兩個星期的時間才搞定，是什么平臺自己去猜，我就不說了！?
String args = "";是原來的加密信息，有公司名稱，只好取掉了。
import java.io.ByteArrayOutputStream;
import java.security.KeyFactory;
import java.security.KeyPair;
import java.security.KeyPairGenerator;
import java.security.Security;
import java.security.spec.PKCS8EncodedKeySpec;
import java.security.spec.X509EncodedKeySpec;
import javax.crypto.Cipher;
import org.bouncycastle.jce.provider.BouncyCastleProvider;
public class rsaok {
?private byte[] PrivateKey;
?private byte[] PublicKey;
?public static void main(String[] args) {
??BouncyCastleProvider bouncycastleprovider = new BouncyCastleProvider();
??if (Security.getProperty(bouncycastleprovider.getName()) == null)
???Security.addProvider(bouncycastleprovider);
??rsaok t = new rsaok();
??t.key();
??t.encrypt();
?}
?public void encrypt() {
??String args = "";
??byte abyte0[] = null;
??Cipher cipher;
??byte abyte1[];
??int i;
??ByteArrayOutputStream bytearrayoutputstream;
??int k;
??try {
???PKCS8EncodedKeySpec pkcs8encodedkeyspec = new PKCS8EncodedKeySpec(
?????PrivateKey);
???KeyFactory keyfactory = KeyFactory.getInstance("RSA");
???java.security.PrivateKey privatekey = keyfactory
?????.generatePrivate(pkcs8encodedkeyspec);
???cipher = Cipher.getInstance("RSA", "BC");
???cipher.init(2, privatekey);
???abyte1 = args.getBytes();
???i = cipher.getBlockSize();
???bytearrayoutputstream = new ByteArrayOutputStream();
???for (k = 0; k < abyte1.length;) {
????int j;
????if (abyte1.length - k >= i)
?????j = i;
????else
?????j = abyte1.length - k;
????bytearrayoutputstream.write(cipher.doFinal(abyte1, k, j));
????k += i;
???}
???bytearrayoutputstream.flush();
???bytearrayoutputstream.close();
???abyte0 = bytearrayoutputstream.toByteArray();
???System.out.println(byte2hex(abyte0));
???decrypt(abyte0);
??} catch (Exception e) {
???e.printStackTrace();
??}
?}
?public void decrypt(byte[] abyte1) {
??try {
???String a = "323856EEAD0A7415283B7B58BDCDD6F58A0EB672E9A134C4923D1230D5E2F6B87CD2FAE30E2DB6CB
50C60E3C7E91DD9D41938D63B28A0D6BE380EBFA748C99E81A4F983343D80C1541728B1259F49FDB4D
CCAA62563AC3C14A91B6C7C374E7AE6B508D79487442B99390AF7C5A699A7040FB6FA7E9EF51100383
6C646ED45651";
???X509EncodedKeySpec x509encodedkeyspec = new X509EncodedKeySpec(PublicKey);
???//X509EncodedKeySpec x509encodedkeyspec = new X509EncodedKeySpec(hex2byte("30819F300D06092A864886F70D010101050003818D0030818902818100BE0C59D90E7A5A582626A209492
452475130557AAE4400180BCB5B0E4138F8C8DED8185E51D17A5FF8B873084742CC245C6DC636432CBA
A5401E5312EBA05A4AB79CB71C71A0E0221BB39DA9893026110447F9820B48C88B8A9862ABADB3E5462
FADD45E3DD251658F48124C6AA091831404E52471A72A4D6CC989EA4959DECB0203010001"));
???Cipher cipher;
???int i;
???ByteArrayOutputStream bytearrayoutputstream;
???int k;
???KeyFactory keyfactory = KeyFactory.getInstance("RSA");
???java.security.PublicKey publickey = keyfactory
?????.generatePublic(x509encodedkeyspec);
???cipher = Cipher.getInstance("RSA", "BC");
???cipher.init(2, publickey);
???i = cipher.getBlockSize();
???bytearrayoutputstream = new ByteArrayOutputStream();
???for (k = 0; k < abyte1.length;) {
????int j;
????if (abyte1.length - k >= i)
?????j = i;
????else
?????j = abyte1.length - k;
????bytearrayoutputstream.write(cipher.doFinal(abyte1, k, j));
????k += i;
???}
???byte abyte0[];
???bytearrayoutputstream.flush();
???bytearrayoutputstream.close();
???abyte0 = bytearrayoutputstream.toByteArray();
???System.out.println(new String(abyte0));
??} catch (Exception e) {
???e.printStackTrace();
??}
?}
?public void key() {
??try {
???KeyPairGenerator kpg = null;
???kpg = KeyPairGenerator.getInstance("RSA", "BC");
???kpg.initialize(1024);
???KeyPair kp = kpg.generateKeyPair();
???PrivateKey = kp.getPrivate().getEncoded();
???System.out.println("PrivateKey:"+byte2hex(PrivateKey));
???PublicKey = kp.getPublic().getEncoded();
???System.out.println("PublicKey:"+byte2hex(PublicKey));
??} catch (Exception e) {
???e.printStackTrace();
??}
?}
?private String byte2hex(byte[] b) {
??String hs = "";
??String stmp = "";
??for (int n = 0; n < b.length; n++) {
???stmp = (java.lang.Integer.toHexString(b[n] & 0XFF));
???if (stmp.length() == 1)
????hs = hs + "0" + stmp;
???else
????hs = hs + stmp;
???if (n < b.length - 1)
????hs = hs + ":";
??}
??return hs.toUpperCase();
?}
?public byte[] hex2byte(String hex) throws IllegalArgumentException {
??if (hex.length() % 2 != 0) {
???throw new IllegalArgumentException();
??}
??char[] arr = hex.toCharArray();
??byte[] b = new byte[hex.length() / 2];
??for (int i = 0, j = 0, l = hex.length(); i < l; i++, j++) {
???String swap = "" + arr[i++] + arr[i];
???int byteint = Integer.parseInt(swap, 16) & 0xFF;
???b[j] = new Integer(byteint).byteValue();
??}
??return b;
?}
}