Java RSA加解密算法转Ruby

[狼王_]

如何将下列的 Java RSA加解密算法转换为Ruby啊？

/**
	 * RSA公钥加密明文
	 * 
	 * @param content
	 *            待加密明文
	 * @return 密文
	 */
	public static String publicEnc(String content, String pk) {
		try {
			KeyFactory keyf = KeyFactory.getInstance("RSA");
			Cipher cipher = Cipher.getInstance("RSA/ECB/PKCS1Padding");
			PublicKey pubkey = null;
			InputStream is = new ByteArrayInputStream(pk.getBytes("utf-8"));

			byte[] pubbytes = new byte[new Long(pk.length()).intValue()];
			is.read(pubbytes);

			X509EncodedKeySpec pubX509 = new X509EncodedKeySpec(Base64.decode(new String(pubbytes)));

			pubkey = keyf.generatePublic(pubX509);
			cipher.init(Cipher.ENCRYPT_MODE, pubkey);
			byte[] cipherText = cipher.doFinal(content.getBytes());
			// 转换为Base64编码存储，以便于internet传送
			return Base64.encode(cipherText);

		} catch (Exception e) {
			e.printStackTrace();
		}

		return "";
	}

	/**
	 * RSA私钥解密密文
	 * 
	 * @param content
	 *            待解密密文
	 * @return 明文
	 */
	public static String privateDec(String content, String prikeyStr) {
		try {
			KeyFactory keyf = KeyFactory.getInstance("RSA");
			PrivateKey privkey = null;
			Cipher cipher = Cipher.getInstance("RSA/ECB/PKCS1Padding");
			InputStream key = new ByteArrayInputStream(prikeyStr.getBytes("utf-8"));
			byte[] pribytes = new byte[new Long(prikeyStr.length()).intValue()];
			key.read(pribytes);
			// 生成私钥
			PKCS8EncodedKeySpec priPKCS8 = new PKCS8EncodedKeySpec(Base64.decode(new String(pribytes)));
			privkey = keyf.generatePrivate(priPKCS8);
			cipher.init(Cipher.DECRYPT_MODE, privkey);
			byte[] newPlainText = cipher.doFinal(Base64.decode(content));

			return (new String(newPlainText));
		} catch (Exception e) {
			e.printStackTrace();
		}

		return "";

	}

[狼王_]

/**
	 * @param path
	 *            文件路径
	 * @throws Exception
	 * 
	 *             生成rsa 公私钥，加密base64编码存储到文件系统
	 */
	public static void createKeyPairs(String path) throws Exception {
		// create the keys
		KeyPairGenerator generator = KeyPairGenerator.getInstance("RSA");
		generator.initialize(1024, new SecureRandom());
		KeyPair pair = generator.generateKeyPair();
		PublicKey pubKey = pair.getPublic();
		PrivateKey privKey = pair.getPrivate();
		byte[] pk = pubKey.getEncoded();
		byte[] privk = privKey.getEncoded();
		// base64编码，屏蔽特殊字符
		String strpk = new String(Base64.encode(pk));
		String strprivk = new String(Base64.encode(privk));

		// 输出私钥文件
		File priKeyfile = new File(path + "rsa_pri_key.pem");
		FileOutputStream out = new FileOutputStream(priKeyfile);
		out.write(strprivk.getBytes());

		// 输出公钥文件
		File pubKeyfile = new File(path + "rsa_pub_key.pem");
		FileOutputStream outPub = new FileOutputStream(pubKeyfile);
		outPub.write(strpk.getBytes());

	}