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);
However, when I use sec_BN in my functions, the recovered BIGNUM is not
the same as sec_BN. When I pass another BIGNUM, for example using the function
BN_rand_range(), then the recovered BIGNUM is equal (proving that my secret
sharing functions is ok).
I think it can be something about Big-Endian conversion in sec_BN, but
I didn't find a way to do this conversion and I don't know if it is necessary
too.
Thanks in advance,
Rafael Cividanes.
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