br.com.esec.icpm.signer.ws.rest.PemUtils Maven / Gradle / Ivy

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This library is used to help with HTTP with SSL auth client and WS-Secutiry.

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package br.com.esec.icpm.signer.ws.rest;

import java.io.BufferedReader;
import java.io.ByteArrayInputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;

import org.apache.commons.codec.binary.Base64;
import org.apache.commons.io.IOUtils;

public class PemUtils {

	public static boolean isPem(File file) throws IOException {
		FileInputStream in = null;
		BufferedReader br = null;
		try {
			in = new FileInputStream(file);
			br = new BufferedReader(new InputStreamReader(in));
			String line = br.readLine();
			if (line.startsWith("--")) {
				return true;
			}

			return false;
		} finally {
			IOUtils.closeQuietly(in);
			IOUtils.closeQuietly(br);
		}
	}

	/**
	 * Reads and decodes a PEM certificate into a DER certificate.
	 * 
	 * @param certificateFile file to convert to DER
	 * @return An InputStream containing the decoded certificate.
	 * @throws IOException
	 *             if the input stream is closed or some other I/O error occurs.
	 */
	public static InputStream convertPemToDer(File certificateFile) throws IOException {
		BufferedReader br = null;
		InputStream certificateStream = null;

		try {
			certificateStream = new FileInputStream(certificateFile);

			StringBuilder buf = new StringBuilder();
			br = new BufferedReader(new InputStreamReader(certificateStream));

			String line = br.readLine();
			while (line != null) {
				if (!line.startsWith("--")) {
					buf.append(line);
				}
				line = br.readLine();
			}

			String pem = buf.toString();
			return new ByteArrayInputStream(Base64.decodeBase64(pem));

		} finally {
			IOUtils.closeQuietly(br);
		}
	}

}