I have three questions:
1. I think on systems which have /dev/urandom, this one is used to seed the PRNG. What happens if the environment variable RANDFILE is set and points to another file or device? Are both used (ORed?) or only RANDFILE? (in addition: what happens when using -rand in genrsa?)
2. When RANDFILE is pointing to a plain file, I notice that after each use, data is written back and the file gets larger and larger.
I understand, that it is necessary to save a new seed for the PRNG, but why is the file not simply overwritten?
3. How many bits of random data are used for seeding, when generating for instance a 2048 bit RSA key?
Best regards,
Gerd Schering
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