> On Nov 18, 2015, at 9:32 PM, Sean Mullan <[email protected]> wrote:
>
> The getInstance methods can now take a SecureRandomParameterSpec object
> (rather than an AlgorithmParameterSpec). They should throw
> InvalidAlgorithmParameterException (not IllegalArgumentException) if the
> parameters are null or not the right type to be consistent with other Spi
> classes.
>
> You will also need to add a protected (or public?) constructor to
> SecureRandomSpi that takes a SecureRandomParameterSpec parameter.
> CertStoreSpi is a good example to follow.
Cool. This is what a JCA engine should look like.
So I create a new method like this
public static SecureRandom getInstance(
String algorithm, SecureRandomParameterSpec spec)
throws NoSuchAlgorithmException, InvalidParameterSpecException {
Instance instance = GetInstance.getInstance("SecureRandom",
SecureRandomSpi.class, algorithm, spec);
SecureRandomSpi spi = (SecureRandomSpi)instance.impl;
SecureRandom r = new SecureRandom(spi, instance.provider, algorithm);
return r;
}
However, I cannot get it working, and I found difficulties understanding the
EngineDescription inner class inside Provider.java.
1. For each engine that can take an extra parameter (not provider) in
getInstance(), it is always named XyzParameters, not an AlgorithmParameterSpec.
2. For each of these, if you have getInstance(alg, params), there is no
getInstance(alg). Obviously, for SecureRandom we need to have both.
3. Not sure what EngineDescription.supportsParameter means. Seems only useful
for those needing a key.
So, it seems I'll have to write the method like
public static SecureRandom getInstance(
String algorithm, SecureRandomParameterSpec spec)
throws NoSuchAlgorithmException, InvalidParameterSpecException {
Instance instance = GetInstance.getInstance("SecureRandom",
SecureRandomSpi.class, algorithm);
SecureRandomSpi spi = (SecureRandomSpi)instance.iml;
spi.engineConfigure(spec);
SecureRandom r = new SecureRandom(spi, instance.provider, algorithm);
return r;
}
which means although configure() is not in SecureRandom, it still must be in
SecureRandomSpi, and there won't be a SecureRandomSpi constructor that takes a
SecureRandomParameterSpec parameter.
Am I doing something wrong?
Thanks
Max
