BN_bn2lebinpad
int BN_bn2lebinpad(const BIGNUM *a, unsigned char *to, int tolen);
LCRYPTO_ALIAS(BN_bn2lebinpad);
LCRYPTO_USED(BN_bn2lebinpad);
if ((ret = BN_bn2lebinpad(bn, buf, bct->bin_len)) < 0) {
if ((ret = BN_bn2lebinpad(bn, buf, bct->bin_len - 1)) != -1) {
if ((ret = BN_bn2lebinpad(bn, buf, 128)) < 0) {