dup_bigint_attr
if ((rv = dup_bigint_attr(&src, buf, buflen)) != CKR_OK)
if ((rv = dup_bigint_attr(&src, value, value_len)) != CKR_OK)
CK_RV dup_bigint_attr(biginteger_t *bi, CK_BYTE *buf, CK_ULONG buflen);
if ((rv = dup_bigint_attr(&src, buf, buflen)) != CKR_OK)