aws_lc_rs/
bn.rs

1// Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
2// SPDX-License-Identifier: Apache-2.0 OR ISC
3
4use crate::aws_lc::{BN_bin2bn, BN_bn2bin, BN_new, BN_num_bytes, BN_set_u64, BIGNUM};
5use crate::ptr::{ConstPointer, DetachableLcPtr, LcPtr};
6use core::ptr::null_mut;
7
8impl TryFrom<&[u8]> for LcPtr<BIGNUM> {
9    type Error = ();
10
11    fn try_from(bytes: &[u8]) -> Result<Self, Self::Error> {
12        unsafe { LcPtr::new(BN_bin2bn(bytes.as_ptr(), bytes.len(), null_mut())) }
13    }
14}
15
16impl TryFrom<&[u8]> for DetachableLcPtr<BIGNUM> {
17    type Error = ();
18
19    fn try_from(bytes: &[u8]) -> Result<Self, Self::Error> {
20        unsafe { DetachableLcPtr::new(BN_bin2bn(bytes.as_ptr(), bytes.len(), null_mut())) }
21    }
22}
23
24impl TryFrom<u64> for DetachableLcPtr<BIGNUM> {
25    type Error = ();
26
27    fn try_from(value: u64) -> Result<Self, Self::Error> {
28        unsafe {
29            let bn = DetachableLcPtr::new(BN_new())?;
30            if 1 != BN_set_u64(*bn, value) {
31                return Err(());
32            }
33            Ok(bn)
34        }
35    }
36}
37
38impl ConstPointer<'_, BIGNUM> {
39    pub(crate) fn to_be_bytes(&self) -> Vec<u8> {
40        unsafe {
41            let bn_bytes = BN_num_bytes(**self);
42            let mut byte_vec = Vec::with_capacity(bn_bytes as usize);
43            let out_bytes = BN_bn2bin(**self, byte_vec.as_mut_ptr());
44            debug_assert_eq!(out_bytes, bn_bytes as usize);
45            byte_vec.set_len(out_bytes);
46            byte_vec
47        }
48    }
49}
aws_lc_rs/bn.rs

aws_lc_rs/
bn.rs
