Blackberry 10 js+html5 RSA加密

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String pwd = sb.reverse().toString();

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 public static String getRSAPairFilePath() {
         String urlPath = RSAUtils.class.getResource("/").getPath();
         String path=(new File(urlPath).getParent() +File.separator+ RSAKeyStore);
         return path;
     }

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function getRSAkey_Encrpty(){
	setMaxDigits(200); 
    key_rsa = new RSAKeyPair("10001","","98565b6f053c21f78c645c64aec952989876279a357efe30ab3c75d482c7ef1c16927b2d5a255ad8beb7059792929885b2054ae005ba4fcaa70da5737e16305d7ecc852802e0360b4ab3c0ba92991a4e41ab49b4403cd46f038c859accba8e9229d6dbd8a1ce606b4681d8aea433073bea86ed6514e8600c30e32d94720ddafd");
    return key_rsa;
}

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import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.math.BigInteger;
import java.security.KeyFactory;
import java.security.KeyPair;
import java.security.KeyPairGenerator;
import java.security.NoSuchAlgorithmException;
import java.security.PrivateKey;
import java.security.PublicKey;
import java.security.SecureRandom;
import java.security.interfaces.RSAPrivateKey;
import java.security.interfaces.RSAPublicKey;
import java.security.spec.InvalidKeySpecException;
import java.security.spec.RSAPrivateKeySpec;
import java.security.spec.RSAPublicKeySpec;

import javax.crypto.Cipher;

import org.apache.log4j.Logger;

import com.heaven.sowbb.server.SowServlet;

public class RSAUtil {
	private static String RSAKeyStore = "RSAKey.txt";
	public static Logger log = Logger.getLogger(RSAUtil.class);
	/**
	 * * 生成密钥对 *
	 * 
	 * @return KeyPair *
	 * @throws EncryptException
	 */
	public static KeyPair generateKeyPair() throws Exception {
		try {
			KeyPairGenerator keyPairGen = KeyPairGenerator.getInstance("RSA",
					new org.bouncycastle.jce.provider.BouncyCastleProvider());
			// 没什么好说的了，这个值关系到块加密的大小，可以更改，但是不要太大，否则效率会低
			final int KEY_SIZE = 1024;
			keyPairGen.initialize(KEY_SIZE, new SecureRandom());
			KeyPair keyPair = keyPairGen.generateKeyPair();
			RSAPublicKey publicKey = (RSAPublicKey) keyPair.getPublic();
			RSAPrivateKey privateKey = (RSAPrivateKey) keyPair.getPrivate();
			System.out.println(publicKey.getModulus().toString(16));
			System.out.println(publicKey.getPublicExponent().toString(16));
			System.out.println(privateKey.getPrivateExponent().toString(16));
			System.out.println(publicKey.getPublicExponent().toString(16).length());
			System.out.println(privateKey.getPrivateExponent().toString(16).length());
			System.out.println("99e28e237fa52ee766e38db10b2bbbcc3fc8f0549781547bbef2d75e952d1f5fda9bb0b61964760fdab21c3f4a940a51e80781da50dd9623ac589a152998e1710b549677e40b74d81bbb039eb8196bda28a9e8c53920f5da1c23e559b9afc39d08dfce7f00fdef88059bec49063f57179628aa259e63d2bf837057b0b25cadf3".length());
			
			saveKeyPair(keyPair);
			return keyPair;
		} catch (Exception e) {
			throw new Exception(e.getMessage());
		}
	}
	
	 public static String getRSAPairFilePath() {
         String urlPath = RSAUtils.class.getResource("/").getPath();
         String path=(new File(urlPath).getParent() +File.separator+ RSAKeyStore);
         try{
         log.error(path);
         }catch(Exception e){}
         return path;
//         return (new File(urlPath).getParent() + RSAKeyStore);
     }


	public static KeyPair getKeyPair() throws Exception {
		String path=getRSAPairFilePath();
		System.out.println(path);
		FileInputStream fis = new FileInputStream(path);
		ObjectInputStream oos = new ObjectInputStream(fis);
		KeyPair kp = (KeyPair) oos.readObject();
		oos.close();
		fis.close();
		return kp;
	}

	public static void saveKeyPair(KeyPair kp) throws Exception {

		FileOutputStream fos = new FileOutputStream(RSAKeyStore);
		ObjectOutputStream oos = new ObjectOutputStream(fos);
		// 生成密钥
		oos.writeObject(kp);
		oos.close();
		fos.close();
	}

	/**
	 * * 生成公钥 *
	 * 
	 * @param modulus *
	 * @param publicExponent *
	 * @return RSAPublicKey *
	 * @throws Exception
	 */
	public static RSAPublicKey generateRSAPublicKey(byte[] modulus,
			byte[] publicExponent) throws Exception {
		KeyFactory keyFac = null;
		try {
			keyFac = KeyFactory.getInstance("RSA",
					new org.bouncycastle.jce.provider.BouncyCastleProvider());
		} catch (NoSuchAlgorithmException ex) {
			throw new Exception(ex.getMessage());
		}

		RSAPublicKeySpec pubKeySpec = new RSAPublicKeySpec(new BigInteger(
				modulus), new BigInteger(publicExponent));
		try {
			return (RSAPublicKey) keyFac.generatePublic(pubKeySpec);
		} catch (InvalidKeySpecException ex) {
			throw new Exception(ex.getMessage());
		}
	}

	/**
	 * * 生成私钥 *
	 * 
	 * @param modulus *
	 * @param privateExponent *
	 * @return RSAPrivateKey *
	 * @throws Exception
	 */
	public static RSAPrivateKey generateRSAPrivateKey(byte[] modulus,
			byte[] privateExponent) throws Exception {
		KeyFactory keyFac = null;
		try {
			keyFac = KeyFactory.getInstance("RSA",
					new org.bouncycastle.jce.provider.BouncyCastleProvider());
		} catch (NoSuchAlgorithmException ex) {
			throw new Exception(ex.getMessage());
		}

		RSAPrivateKeySpec priKeySpec = new RSAPrivateKeySpec(new BigInteger(
				modulus), new BigInteger(privateExponent));
		try {
			return (RSAPrivateKey) keyFac.generatePrivate(priKeySpec);
		} catch (InvalidKeySpecException ex) {
			throw new Exception(ex.getMessage());
		}
	}

	/**
	 * * 加密 *
	 * 
	 * @param key
	 *            加密的密钥 *
	 * @param data
	 *            待加密的明文数据 *
	 * @return 加密后的数据 *
	 * @throws Exception
	 */
	public static byte[] encrypt(PublicKey pk, byte[] data) throws Exception {
		try {
			Cipher cipher = Cipher.getInstance("RSA",
					new org.bouncycastle.jce.provider.BouncyCastleProvider());
			cipher.init(Cipher.ENCRYPT_MODE, pk);
			// 获得加密块大小，如：加密前数据为128个byte，而key_size=1024
			int blockSize = cipher.getBlockSize();
			// 加密块大小为127
			// byte,加密后为128个byte;因此共有2个加密块，第一个127
			// byte第二个为1个byte
			// 获得加密块加密后块大小
			int outputSize = cipher.getOutputSize(data.length);
			int leavedSize = data.length % blockSize;
			int blocksSize = leavedSize != 0 ? data.length / blockSize + 1
					: data.length / blockSize;
			byte[] raw = new byte[outputSize * blocksSize];
			int i = 0;
			while (data.length - i * blockSize > 0) {
				if (data.length - i * blockSize > blockSize)
					cipher.doFinal(data, i * blockSize, blockSize, raw, i
							* outputSize);
				else
					cipher.doFinal(data, i * blockSize, data.length - i
							* blockSize, raw, i * outputSize);
				// 这里面doUpdate方法不可用，查看源代码后发现每次doUpdate后并
				// 没有什么实际动作除了把byte[]放到ByteArrayOutputStream中，
				//而最后doFinal的时候才将所有的byte[]进行加密，可是到了此时加
				// 密块大小很可能已经超出了OutputSize所以只好用dofinal方法。

				i++;
			}
			return raw;
		} catch (Exception e) {
			throw new Exception(e.getMessage());
		}
	}

	/**
	 * * 解密 *
	 * 
	 * @param key
	 *            解密的密钥 *
	 * @param raw
	 *            已经加密的数据 *
	 * @return 解密后的明文 *
	 * @throws Exception
	 */
	public static byte[] decrypt(PrivateKey pk, byte[] raw) throws Exception {
		try {
			Cipher cipher = Cipher.getInstance("RSA",
					new org.bouncycastle.jce.provider.BouncyCastleProvider());
			cipher.init(cipher.DECRYPT_MODE, pk);
			int blockSize = cipher.getBlockSize();
			ByteArrayOutputStream bout = new ByteArrayOutputStream(64);
			int j = 0;
			//判断数组首元素是否为0，若是，则将其删除，保证模的位数是128 
			if(raw[0]==0 && raw.length==129) 
	         {  
	              byte[] temp=new byte[raw.length-1];  
	              for(int i=0;i<raw.length-1;i++)  
	              {  
	                   temp[i]=raw[i+1];  
	              } 
	              raw=temp;
	         }  
			
			while (raw.length - j * blockSize > 0) {
				bout.write(cipher.doFinal(raw, j * blockSize, blockSize));
				j++;
			}
			return bout.toByteArray();
		} catch (Exception e) {
			throw new Exception(e.getMessage());
		}
	}
	
	public static String decrypt(String result) throws Exception{
		byte[] en_result = new BigInteger(result, 16).toByteArray();
		try{
			byte[] de_result = decrypt(getKeyPair().getPrivate(),
					en_result);
			StringBuffer sb = new StringBuffer();
			sb.append(new String(de_result));
			//将字符串顺序反过来
			String pwd = sb.reverse().toString();
			return pwd;
		}catch(Exception e){
		 throw new Exception(e.getMessage());
		}
	}
}