Pawel Jakub Dawidek wrote:
Hello.
We're trying to get as small RSA private key as possible, because we
are short in space (we want to store it on a smart card, so every byte
is important).
We found a way to cut it a bit by NULLing some pointers inside RSA
structure:
RSA *key;
key->p = NULL;
key->q = NULL;
key->dmp1 = NULL;
key->dmq1 = NULL;
key->iqmp = NULL;
and store it in DER format:
i2d_RSAPrivateKey(key, &bufp);
But, as you can see, it is a very hackish solution and we wonder if there
is no more standard and clean way to implement this.
How to store a rsa private key on a smartcard depends on what
you want to do with the private key on the card. In case want
to use a crypto card for, for example, signature generation the
format of the private key is os specific. If you want to use
the smartcard as a memory stick the format doesn't really matter.
If you need a standard try pkcs#15, but pkcs#15 is not so easy
to implement (and it creates a lot of overhead in this case).
Nils
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