On Thu, Nov 07, 2002 at 08:56:53PM +0100, [EMAIL PROTECTED] wrote:
>
> Hello!
>
> I generate a private key using:
> openssl genrsa -out xxx.key 1024
> It contains the private key, but I can get the public key this way:
> openssl rsa -in xxx.key -pubout -out yyy.pub
>
> I can get the private key in a C program using
> PEM_read_PrivateKey(..), but I can't find
> PEM_read_PublicKey(..) function.
PEM_read_RSA_PUBKEY(...);
>
> So the question is, how could I get the public_key into an EVP_PKEY
> structure from the generated key file. I would use DSA keys too, so I
> would prefer EVP_PKEY struct.
>
> Thanks:
> Peter
>
> ps.: is it possible, that the private key file contains the public key
> too?
struct
{
BIGNUM *n; // public modulus
BIGNUM *e; // public exponent
BIGNUM *d; // private exponent
BIGNUM *p; // secret prime factor
BIGNUM *q; // secret prime factor
BIGNUM *dmp1; // d mod (p-1)
BIGNUM *dmq1; // d mod (q-1)
BIGNUM *iqmp; // q^-1 mod p
// ...
};
RSA
Read the private key and delete d, p, q, dmp1, dmq1, iqmp
and you have a public key :-)
(man 3 RSA)
Christian
>
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