Exemple #1
0
  static DHPublicKey parseDH(DataByteInputStream in) throws IOException {
    int special = 0;
    int pLength = in.readUnsignedShort();
    if (pLength < 16 && pLength != 1 && pLength != 2) return null;
    BigInteger p;
    if (pLength == 1 || pLength == 2) {
      if (pLength == 1) special = in.readUnsignedByte();
      else special = in.readUnsignedShort();
      if (special != 1 && special != 2) return null;
      if (special == 1) p = DHPRIME768;
      else p = DHPRIME1024;
    } else p = in.readBigInteger(pLength);

    int gLength = in.readUnsignedShort();
    BigInteger g;
    if (gLength == 0) {
      if (special != 0) g = TWO;
      else return null;
    } else g = in.readBigInteger(gLength);

    int yLength = in.readUnsignedShort();
    BigInteger y = in.readBigInteger(yLength);

    return new DHPubKey(p, g, y);
  }
Exemple #2
0
  static DSAPublicKey parseDSA(DataByteInputStream in) throws IOException {
    byte t = in.readByte();

    BigInteger q = in.readBigInteger(20);
    BigInteger p = in.readBigInteger(64 + t * 8);
    BigInteger g = in.readBigInteger(64 + t * 8);
    BigInteger y = in.readBigInteger(64 + t * 8);

    DSAPublicKey dsa = new DSAPubKey(p, q, g, y);
    return dsa;
  }
Exemple #3
0
  static RSAPublicKey parseRSA(DataByteInputStream in) throws IOException {
    int exponentLength = in.readUnsignedByte();
    if (exponentLength == 0) exponentLength = in.readUnsignedShort();
    BigInteger exponent = in.readBigInteger(exponentLength);

    int modulusLength = in.available();
    BigInteger modulus = in.readBigInteger(modulusLength);

    RSAPublicKey rsa = new RSAPubKey(modulus, exponent);
    return rsa;
  }