many certificates can be issued on a single public key.
portecle makes a strong association of one public with
one private key.
When for example exporting to a pfx that association is
Attached an example where a second certificate with the
same modulus and exponent is present.
1) upon certificate import detect certificates with the
same public key
2) upon certificate import detect the corresponding
3) allow establish a flexible 1:n relation between the
private key and its corresponding certificates