Hi David,
1. I am not sure what you mean by replacing RSA_generate_key with my own
function, because I would like it to go through the process of creating
prime numbers, and modulus, etc. Basically I want the RSA_generate_key
to generate the same public key at startup each time my process runs.
2. You say I could do this with writing my own PRNG? Do you have an
example of this?
3. I went into the RSA_generate_key code and I saw during the prime
number calculation that the function bnrand() actually uses the system
time as a seed. If this was the case, how could I ever get
RSA_generate_key to return the same public key?
-----Original Message-----
From: David Schwartz [mailto:[hidden email]]
Sent: Monday, January 31, 2011 7:37 PM
To: [hidden email]
Cc: Ashwin Chandra
Subject: Re: RSA_generate_key function
On 1/31/2011 5:37 PM, Ashwin Chandra wrote:
> I would like to call this function to generate the same public/private
> key everytime.
>
> I thought all I had to do was create the same seed using RAND_seed
> each time, however I still keep getting different key pairs.
>
> Is there any way to have RSA_generate_key generate the same
> public/private key each time? (I know this doesn't make sense security
> wise, but the work I have to do requires it).
>
Replace RSA_generate_key with your own function that returns the desired
key. Using the same seed each time won't work because intervening
operations can leave the PRNG in a different state. You could use your
own PRNG to replace OpenSSL's and then put it into a particular state
prior to calling RSA_generate_key.
DS
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