public String gen(RandomSource randomSource, String[] args) throws GenException {
Opt opt = opt();
String res = GeneratorTool.defaultProcess(opt, args);
if (res != null) {
return res;
}
String keypairString = opt.getStringValue("keypair");
int certainty = opt.getIntValue("-cert", DEFAULT_CERT);
try {
SignatureKeyPair keypair =
Marshalizer.unmarshalHexAux_SignatureKeyPair(keypairString, randomSource, certainty);
return Marshalizer.marshalToHexHuman(keypair.getPKey(), opt.getBooleanValue("-v"));
} catch (EIOException eioe) {
throw new GenException("Malformed key pair!", eioe);
}
}
/**
* Generates an option instance containing suitable options and description.
*
* @return Option instance representing valid inputs to this instance.
*/
protected Opt opt() {
Opt opt = GeneratorTool.defaultOpt(SignaturePKey.class.getSimpleName(), 1);
opt.setUsageComment(
"(where "
+ SignaturePKey.class.getSimpleName()
+ " = "
+ SignaturePKey.class.getName()
+ ")");
opt.addParameter("keypair", "Signature key pair " + "(vfork.crypto.SignatureKeyPair).");
opt.addOption(
"-cert",
"value",
"Determines the probability that the input key pair "
+ "is malformed, i.e., a value "
+ "of t gives a bound of 2^(-t)."
+ " Defaults to "
+ DEFAULT_CERT
+ ".");
String s = "Extracts a signature public key from a key pair.";
opt.appendToUsageForm(1, "#-cert#keypair#");
opt.appendDescription(s);
return opt;
}