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);
}
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;
}
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;
}