I am trying to import the public RSA key (modulus) created on a
Smart Card into an OpenSSL/OpenSSH key structure. The size of
the Smart Card public/private key pair is 1024 bits, and the key pair
was generated onboard the Smart Card.
I use the following code:
Key *k;
k = key_new(KEY_RSA);
if(k)
{
k->rsa = RSA_generate_key(1024,RSA_F4,NULL,NULL);
BN_clear_free(k->rsa->n);
k->rsa->n = BN_bin2bn(data,len,NULL);
}
If I check the size of k->rsa->n after the RSA_generate_key, the
result from BN_num_bytes is 128 and from BN_num_bits is 1024.
If I check the size of k->rsa->n after the BN_bin2bn call the result
from BN_num_bytes is 128 and from BN_num_bits is 1023.
Thel BN_bin2bn function call passes the public key data/len
obtained from the Smart Card.
I am using the OpenSSL/OpenSSH key structure to hold the public
key just to be able to use all the current utilities necessary for the
public key processing such as saving on the local file system,
uploading to the host and for agent signing.
What is causing the difference in the BN_num_bits result?
Ken
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