> I would recommend operating with the output of BN_bn2bin, and
> where you need to go back the other way, converting back to a BIGNUM using
> BN_bin2bn. The output of BN_bn2bin (and input to BN_bin2bn) is a
byte-array
> (rather than variable-length words) and is always MS byte first. This also
> prevents you getting into trouble from various padding-out issues,
> trailing zeroes, and other head-scratchers.
Thanks for help, I have another little problem.
If I call
BN_bn2bin(bn,NULL)
just to get the buffer length, I get an exception.
My intention was:
1) len=BN_bn2bin(bn,NULL);
2) buffer=(unsigned char*)malloc(len);
3) len=BN_bn2bin(bn,buffer);
Is that sequence wrong?
Do I have to calculate myself the size of returned buffer?
Is the buffer allocated from the BN_bn2bin itself? (I don't think, looking
at the prototype)
what's the difference between BN_bn2bin and the BN_bn2mpi ?
thanks in advance
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