rsa/oaep/
decrypting_key.rsuse super::decrypt_digest;
use crate::{
dummy_rng::DummyRng,
traits::{Decryptor, RandomizedDecryptor},
Result, RsaPrivateKey,
};
use alloc::{
string::{String, ToString},
vec::Vec,
};
use core::marker::PhantomData;
use digest::{Digest, FixedOutputReset};
use rand_core::CryptoRngCore;
use zeroize::ZeroizeOnDrop;
#[derive(Debug, Clone)]
pub struct DecryptingKey<D, MGD = D>
where
D: Digest,
MGD: Digest + FixedOutputReset,
{
inner: RsaPrivateKey,
label: Option<String>,
phantom: PhantomData<D>,
mg_phantom: PhantomData<MGD>,
}
impl<D, MGD> DecryptingKey<D, MGD>
where
D: Digest,
MGD: Digest + FixedOutputReset,
{
pub fn new(key: RsaPrivateKey) -> Self {
Self {
inner: key,
label: None,
phantom: Default::default(),
mg_phantom: Default::default(),
}
}
pub fn new_with_label<S: AsRef<str>>(key: RsaPrivateKey, label: S) -> Self {
Self {
inner: key,
label: Some(label.as_ref().to_string()),
phantom: Default::default(),
mg_phantom: Default::default(),
}
}
}
impl<D, MGD> Decryptor for DecryptingKey<D, MGD>
where
D: Digest,
MGD: Digest + FixedOutputReset,
{
fn decrypt(&self, ciphertext: &[u8]) -> Result<Vec<u8>> {
decrypt_digest::<DummyRng, D, MGD>(
None,
&self.inner,
ciphertext,
self.label.as_ref().cloned(),
)
}
}
impl<D, MGD> RandomizedDecryptor for DecryptingKey<D, MGD>
where
D: Digest,
MGD: Digest + FixedOutputReset,
{
fn decrypt_with_rng<R: CryptoRngCore + ?Sized>(
&self,
rng: &mut R,
ciphertext: &[u8],
) -> Result<Vec<u8>> {
decrypt_digest::<_, D, MGD>(
Some(rng),
&self.inner,
ciphertext,
self.label.as_ref().cloned(),
)
}
}
impl<D, MGD> ZeroizeOnDrop for DecryptingKey<D, MGD>
where
D: Digest,
MGD: Digest + FixedOutputReset,
{
}