GOST_bn2le
extern int GOST_bn2le(BIGNUM *bn, unsigned char *buf, int len);
GOST_bn2le(X, sptr, key_size);
GOST_bn2le(Y, sptr + key_size, key_size);
GOST_bn2le(s->r, sig, order);
GOST_bn2le(s->s, sig + order, order);
GOST_bn2le(X, hashbuf, 32);
GOST_bn2le(Y, hashbuf + 32, 32);
GOST_bn2le(X, hashbuf, 32);
GOST_bn2le(Y, hashbuf + 32, 32);
GOST_bn2le(X, hashbuf, 64);
GOST_bn2le(Y, hashbuf + 64, 64);