On Fri, Jan 14, 2005, Przemek Michalski wrote:
> Hi there,
>
> I am trying to play with large serial numbers, however I found that the
> function
> ASN1_INTEGER_get() applied with the following code:
>
> /*--------------*/
> ASN1_INTEGER_get(X509_get_serialNumber(cert));
> /*--------------*/
>
> where 'cert' is the certificate resource, has limited capabilities, in terms
> of returning
> 'long' values. It simply returns '-1' value if the certificate serial number
> is a very
> large value, which clearly this function can not handle for some reason.
>
> Instead of having a 'long' value, I could use a hexadecimal value of the
> serial number
> represented/converted by/to a char string.
>
> Does anyone has a simple code for that.
>
> I have found that asn1.h has a declaration of a function:
> i2a_ASN1_INTEGER()
>
> which outputs a hexadecimal representation of the serial number value to the
> BIO variable.
> I wish not to use a bio structure variable, but a simple char variable, that
> I could use
> in other parts of my application code.
>
> Any advise, sample codes, really appreciated.
>
This is an openssl-users question not openssl-dev.
The X509_get_serialNumber() function returns an ASN1_INTEGER type.
You can use ASN1_STRING_{type,length,data) on that to get the internal data.
This will be a big endian format where the type is V_ASN1_NEG_INTEGER if it
is negative.
Alternatively you can use ASN1_INTEGER_to_BN() to convert to a BIGNUM which
you can then use the appropriate bn functions on.
Steve.
--
Dr Stephen N. Henson. Email, S/MIME and PGP keys: see homepage
OpenSSL project core developer and freelance consultant.
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