Android Open Source - anokicert Cert List Parser

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License

The source code is released under:

GNU General Public License

Java Source Code

/*
 *  This file is part of NokiCert.//from ww  w  .j  a va  2 s  .  c  om
 *
 *  NokiCert is free software: you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation, either version 3 of the License, or
 *  (at your option) any later version.
 *
 *  NokiCert is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with NokiCert.  If not, see <http://www.gnu.org/licenses/>.
 */
package net.tuxed.nokicert;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.Serializable;
import java.util.ArrayList;

import net.tuxed.gjokii.GjokiiException;
import net.tuxed.misc.Utils;

/**
 * This class analyzes the certificate file list from the Nokia phones
 * 
 * @author F. Kooman <fkooman@tuxed.net>
 * 
 */
public class CertListParser {

  private boolean littleEndian;
  private final File file;

  public CertListParser(final File file) {
    this.file = file;
  }

  public boolean hasLittleEndianSizeBytes() {
    return littleEndian;
  }

  public ArrayList<CertListItem> parse() throws GjokiiException {
    final ArrayList<CertListItem> list = new ArrayList<CertListItem>();
    FileInputStream fis = null;
    try {
      fis = new FileInputStream(file);
      while (fis.available() > 4) {
        int bytesRead = 0;
        final byte[] lengthBytes = new byte[2];
        fis.read(lengthBytes);
        int size = Utils.byteArrayToShort(lengthBytes, 0) - 2;
        if (size >= file.length() || size < 0) {
          /* we seem to have a little endian length indicator */
          littleEndian = true;
          size = Utils.byteArrayToShortLE(lengthBytes, 0) - 2;
        }
        // System.out.println(Utils.byteArrayToString(lengthBytes));
        // System.out.println("Size of block: " + size);
        bytesRead += fis.skip(10);
        final byte[] fingerprint = new byte[20];
        bytesRead += fis.read(fingerprint);
        final byte[] hashOfModulus = new byte[20];
        bytesRead += fis.read(hashOfModulus);
        final byte[] unknownField = new byte[20];
        bytesRead += fis.read(unknownField);
        final byte[] hashOfSubject = new byte[20];
        bytesRead += fis.read(hashOfSubject);
        final byte[] hashOfIssuer = new byte[20];
        bytesRead += fis.read(hashOfIssuer);
        final int sizeOfFileName = fis.read();
        bytesRead++;
        final byte[] fileName = new byte[sizeOfFileName - 1];
        bytesRead += fis.read(fileName);
        // System.out.println(new String(fileName));
        bytesRead += fis.skip(2);
        int keyUsage = 0;
        final int keyUsageLength = fis.read();
        // System.out.println(keyUsageLength);
        bytesRead++;
        final byte[] keyUsageBytes = new byte[keyUsageLength];
        bytesRead += fis.read(keyUsageBytes);
        // System.out.println(Utils.byteArrayToString(keyUsageBytes));
        /* read all usages */
        int offset = 1;
        while (offset < keyUsageBytes.length) {
          final int curKeyUsageLength = keyUsageBytes[offset];
          if (curKeyUsageLength + offset > keyUsageBytes.length || curKeyUsageLength < 0) {
            /*
             * something seems wrong in key usage byte array, skip
             * it
             */
            break;
          }
          final byte[] t = new byte[curKeyUsageLength];
          offset++;
          System.arraycopy(keyUsageBytes, offset, t, 0, curKeyUsageLength);
          keyUsage |= NokiCertUtils.keyUsageBytesToType(t);
          offset += curKeyUsageLength + 1;
        }
        // System.out.println("Skipping " + (size - bytesRead)
        // + " bytes...");
        fis.skip(size - bytesRead);
        list.add(new CertListItem(new String(fileName), fingerprint, hashOfModulus, unknownField,
            hashOfSubject, hashOfIssuer, keyUsage));
      }
    } catch (final FileNotFoundException e) {
      e.printStackTrace();
    } catch (final IOException e) {
      e.printStackTrace();
    } finally {
      Utils.closeSliently(fis);
    }
    return list;
  }

  public static class CertListItem implements Serializable {
    private static final long serialVersionUID = 4925312087598482273L;
    public final String fileName;
    public final byte[] fingerprint, hashOfModulus, unknownField, hashOfSubject, hashOfIssuer;
    public final int keyUsage;

    CertListItem(final String fileName, final byte[] fingerprint, final byte[] hashOfModulus,
        final byte[] unknownField, final byte[] hashOfSubject, final byte[] hashOfIssuer, final int keyUsage) {
      this.fileName = fileName;
      this.fingerprint = fingerprint;
      this.hashOfModulus = hashOfModulus;
      this.unknownField = unknownField;
      this.hashOfSubject = hashOfSubject;
      this.hashOfIssuer = hashOfIssuer;
      this.keyUsage = keyUsage;
    }

    public String getFileName() {
      return fileName;
    }

    public byte[] getFingerprint() {
      return fingerprint;
    }

    public byte[] getHashOfIssuer() {
      return hashOfIssuer;
    }

    public byte[] getHashOfModulus() {
      return hashOfModulus;
    }

    public byte[] getHashOfSubject() {
      return hashOfSubject;
    }

    public int getKeyUsage() {
      return keyUsage;
    }

    public byte[] getUnknownField() {
      return unknownField;
    }

    @Override
    public String toString() {
      return "CertListItem [fileName=" + fileName + ", fingerprint=" + Utils.byteArrayToString(fingerprint)
          + ", hashOfModulus=" + Utils.byteArrayToString(hashOfModulus) + ", unknownField="
          + Utils.byteArrayToString(unknownField) + ", hashOfSubject="
          + Utils.byteArrayToString(hashOfSubject) + ", hashOfIssuer="
          + Utils.byteArrayToString(hashOfIssuer) + ", keyUsage=" + keyUsage + "]";
    }
  }

}

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