Rafael Cividanes wrote:
Hi,
I've implemented (in C++) a simple form of shamir secret sharing for
the particular case (3,5). One function receives a BIGNUM A0 an
generates the 5 secrets. Another function, receives 3 secrets and
generates the recover BIGNUM A0. It's working fine.
The problem is that I need to convert a RSA private key into a
BIGNUM A0, and I'm having trouble with this.
I was trying to do this (part of my code):
RSA *Ch_Ap
unsigned char *buffer, *next;
BIGNUM *sec_BN = BN_new();
Ch_Ap = RSA_generate_key(2048, RSA_F4, NULL, 0);
int size = i2d_RSAPrivateKey(Ch_Ap, 0);
buffer = next =(unsigned char *)malloc(size);
i2d_RSAPrivateKey(Ch_Ap, &next);
BN_bin2bn(buffer, size, sec_BN);
are you sure that you want to put the DER encoded private key
object into a BIGNUM (instead of rsa->d) ?
Cheers,
Nils
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