Window CryptoAPI: Can I choose the public exponent when generating an RSA key pair?

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Window CryptoAPI: Can I choose the public exponent when generating an RSA key pair?

Using the Windows CryptoAPI, is there any way to specify which public exponent to use when generating a new key-pair (ie. 3 instead of 65537)?

As a bonus question: how would I access this functionality using .NET RSACryptoServiceProvider?

EDIT: My guess is that the answer is "No", but I would like to get confirmation.

+3 A:

No - there we go :) More seriously CryptGenKey The only parameters you can send to CryptGenKey are set in CryptSetKeyParam. You can see from the documentation you can only set a limited number of properties for each key type, and only one for RSA keys.

(Plus, as I'm sure you're aware, small exponents are dangerous anyway)

blowdart 2009-11-18 11:12:34

Prime? Generator? If you are talking about KP_G and KP_P, those are for DSA.

Rasmus Faber 2009-11-18 13:52:30

Errr doh. Slows how asleep I am :)Still, the parameters structure still applies, it's the only way to effect key generation, and there's nothing there for RSA except for KP_OAEP_PARAMS

blowdart 2009-11-18 14:10:02

+1 A:

I think this answers your second question:

EncryptTo/DecryptTo: Encryption in .NET with CryptoAPI Certificate Stores

0A0D 2009-11-20 16:10:41

ansaurus

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Window CryptoAPI: Can I choose the public exponent when generating an RSA key pair?

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