code: public static Certificate readCertificate(String type, InputStream in) {
  		try {
  			return getCertificateFactory(type).generateCertificate(in);
  		} catch (CertificateException e) {
  			throw new CryptoException(e);
  		}
  	}
docs: 读取Certification文件<br>
  Certification为证书文件<br>
  see: http://snowolf.iteye.com/blog/391931
  
  @param type 类型，例如X.509
  @param in {@link InputStream} 如果想从文件读取.cer文件，使用 {@link FileUtil#getInputStream(java.io.File)} 读取
  @return {@link Certificate}