The RSA key components are as follows:
n - modulus, mandatory for public and private
e - public exponent, mandatory for public
d - private exponent, mandatory for private
p, q, dmp1, qmp1, iqmp - optional for private
If the key contains (n, e, d) then it contains the public and private
components and can be used as both a public and private key. If d is NULL,
but n and e are not, then it will be a public key. I doubt you'll ever find
the case where e is NULL, but n and d are not, but if you do then it is a
private key; a private key will contain all three of these components and
most likely the optional components also.
The problem that you were having the other day was due to passing a public
key (d == NULL) to RSA_check_key and, as I pointed out, the code
dereferences d which causes the crash.
Steven
--
Steven Reddie <[EMAIL PROTECTED]>
Senior Software Engineer
Computer Associates Pty Ltd (Australia)
> -----Original Message-----
> From: Kubyshev Andrey [SMTP:[EMAIL PROTECTED]]
> Sent: Wednesday, February 28, 2001 8:22 AM
> To: [EMAIL PROTECTED]
> Subject: Private or public
>
> Hello openssl-users,
>
> How to check if RSA * points to private or public key ?
> Dont advice RSA_check_key crashes - see previous letter.
> thank you for attention.
>
> --
> Best regards,
> Andrey Kubyshev mailto:[EMAIL PROTECTED]
>
>
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