Rafa Marín López wrote:
> Hello.
Hi.
>
> RSA * d2i_RSAPublicKey(RSA **a, unsigned char **pp, long length);
>
> What does length param mean?
length is the length of the *pp data, that means it is the number of bytes that you
want to convert from DER to internal form, starting at location *pp. Still in other
words, it is the data contained inbetween *pp and *pp+(length-1) that will be
converted from DER to internal form. On successful completion, *pp will be updated to
point to *pp + length.
You must pass this info to the function because it has no other reliable means to
determine how long the DER-encoded data is. (It could use the length info of the first
tag it sees, but it doesn't).
BTW, a good source for answers to this kind of questions is
http://www.columbia.edu/~ariel/ssleay. Although the stuff there is sometimes a bit
outdated, it can still help a lot.
Cheers,
Steve
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