Robert Eiglmaier wrote:
>
> Hi, developers!
>
> While trying to understand the ASN.1 stuff I wrote the following lines:
>
> ASN1_INTEGER * pInt, * qInt;
> unsigned char buf[1024], *cPtr;
> int l, p, q;
>
> p = -2;
> pInt = ASN1_INTEGER_new();
> ASN1_INTEGER_set(pInt, p);
> cPtr = buf;
> i2d_ASN1_INTEGER(pInt, &cPtr); // DER encode p
> l = (cPtr - buf);
> cPtr = buf;
> qInt = d2i_ASN1_INTEGER(NULL, &cPtr, l); // DER decode q
> q = ASN1_INTEGER_get(qInt);
>
> printf("p = %d q = %d\n", p, q);
>
> why is q = -32770 ???? and not -2 ?
>
This should be fixed in the latest snapshot. It was caused by broken
ASN1 handling of negative integers and was rather painfulto fix :-(
Steve.
--
Dr Stephen N. Henson. http://www.drh-consultancy.demon.co.uk/
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Senior crypto engineer, Celo Communications: http://www.celocom.com/
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