Example #1
0
  static byte[] buildDSA(DSAPublicKey key) {
    DataByteOutputStream out = new DataByteOutputStream();
    BigInteger q = key.getParams().getQ();
    BigInteger p = key.getParams().getP();
    BigInteger g = key.getParams().getG();
    BigInteger y = key.getY();
    int t = (p.toByteArray().length - 64) / 8;

    out.writeByte(t);
    out.writeBigInteger(q);
    out.writeBigInteger(p);
    out.writeBigInteger(g);
    out.writeBigInteger(y);

    return out.toByteArray();
  }
Example #2
0
  static byte[] buildDH(DHPublicKey key) {
    DataByteOutputStream out = new DataByteOutputStream();
    BigInteger p = key.getParams().getP();
    BigInteger g = key.getParams().getG();
    BigInteger y = key.getY();

    int pLength, gLength, yLength;
    if (g.equals(TWO) && (p.equals(DHPRIME768) || p.equals(DHPRIME1024))) {
      pLength = 1;
      gLength = 0;
    } else {
      pLength = BigIntegerLength(p);
      gLength = BigIntegerLength(g);
    }
    yLength = BigIntegerLength(y);

    out.writeShort(pLength);
    if (pLength == 1) {
      if (p.bitLength() == 768) out.writeByte((byte) 1);
      else out.writeByte((byte) 2);
    } else out.writeBigInteger(p);
    out.writeShort(gLength);
    if (gLength > 0) out.writeBigInteger(g);
    out.writeShort(yLength);
    out.writeBigInteger(y);

    return out.toByteArray();
  }
Example #3
0
 static int BigIntegerLength(BigInteger i) {
   byte[] b = i.toByteArray();
   return (b[0] == 0 ? b.length - 1 : b.length);
 }