RSA加密算法公钥提取失败求助

[wolf_Springs]

Exception in thread "main" java.security.cert.CertificateException: Could not parse certificate: java.io.IOException: DerInputStream.getLength(): lengthTag=109, too big.
	at sun.security.provider.X509Factory.engineGenerateCertificate(X509Factory.java:109)
	at java.security.cert.CertificateFactory.generateCertificate(CertificateFactory.java:305)
	at com.yitong.commons.util.security.RSACerPlus.doEncrypt(RSACerPlus.java:105)
	at com.yitong.commons.util.security.RSACerPlus.main(RSACerPlus.java:145)
Caused by: java.io.IOException: DerInputStream.getLength(): lengthTag=109, too big.
	at sun.security.util.DerInputStream.getLength(DerInputStream.java:544)
	at sun.security.util.DerValue.init(DerValue.java:346)
	at sun.security.util.DerValue.<init>(DerValue.java:302)
	at sun.security.provider.X509Factory.engineGenerateCertificate(X509Factory.java:104)
	... 3 more

做实现对数据进行加密处理的方法时候报出以上异常,查询了一下似乎和数字证书有关.但还是感觉一头雾水.求各位大神帮忙.下面是代码:

public String doEncrypt(String[] str) throws Exception {
		//获取公钥
		CertificateFactory cff = CertificateFactory.getInstance("X.509");
		String filePath = Log4jInit.getCommString(Consts.jks_path);	
		InputStream in = new FileInputStream(filePath);// 证书文件
		//获得公钥文件(报错的地方)
		Certificate cf = cff.generateCertificate(in);
		PublicKey pk1 = cf.getPublicKey(); // 得到证书文件携带的公钥
		Cipher cipher = Cipher.getInstance("RSA");
		// 加密模式
		cipher.init(Cipher.ENCRYPT_MODE, pk1);
		byte[] msg1 = cipher.doFinal(str.toString().getBytes("UTF-8")); // 加密后的数据
		return new BASE64Encoder().encode(msg1);
	}

[「已注销」]

长度不对，RSA对长度有要求，比如你用asdfg进行加密，而解密的长度不符合要求，比如asdf，就会出现这个错误。

[花谢尊前不敢香]

一次生成了双向证书？