> Thus, I conclude that there is some format in place, respectively
> how do I know where a bignum starts and where it ends?

The format is ANSI X.690, also knows as BER or DER, somtimes (slightly
erroneously) referred to as ASN.1.

> I tried to find a clue by browsing the sources, but I gave up
> confused by all the asn1 parse and nested bio print functions.
>
> Can some one please put me into the right direction? I appreciate
> help and comments!

X.690 is an ITU standard. It is, in fact, still the preferred protocol for
the interchange of binary data. Googling "X.690" should find you lots of
information.

http://asn1.elibel.tm.fr/standards/

DS


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