rsa/oaep/
decrypting_key.rs

1use super::decrypt_digest;
2use crate::{
3    dummy_rng::DummyRng,
4    traits::{Decryptor, RandomizedDecryptor},
5    Result, RsaPrivateKey,
6};
7use alloc::{
8    string::{String, ToString},
9    vec::Vec,
10};
11use core::marker::PhantomData;
12use digest::{Digest, FixedOutputReset};
13use rand_core::CryptoRngCore;
14use zeroize::ZeroizeOnDrop;
15
16/// Decryption key for PKCS#1 v1.5 decryption as described in [RFC8017 § 7.1].
17///
18/// [RFC8017 § 7.1]: https://datatracker.ietf.org/doc/html/rfc8017#section-7.1
19#[derive(Debug, Clone)]
20pub struct DecryptingKey<D, MGD = D>
21where
22    D: Digest,
23    MGD: Digest + FixedOutputReset,
24{
25    inner: RsaPrivateKey,
26    label: Option<String>,
27    phantom: PhantomData<D>,
28    mg_phantom: PhantomData<MGD>,
29}
30
31impl<D, MGD> DecryptingKey<D, MGD>
32where
33    D: Digest,
34    MGD: Digest + FixedOutputReset,
35{
36    /// Create a new verifying key from an RSA public key.
37    pub fn new(key: RsaPrivateKey) -> Self {
38        Self {
39            inner: key,
40            label: None,
41            phantom: Default::default(),
42            mg_phantom: Default::default(),
43        }
44    }
45
46    /// Create a new verifying key from an RSA public key using provided label
47    pub fn new_with_label<S: AsRef<str>>(key: RsaPrivateKey, label: S) -> Self {
48        Self {
49            inner: key,
50            label: Some(label.as_ref().to_string()),
51            phantom: Default::default(),
52            mg_phantom: Default::default(),
53        }
54    }
55}
56
57impl<D, MGD> Decryptor for DecryptingKey<D, MGD>
58where
59    D: Digest,
60    MGD: Digest + FixedOutputReset,
61{
62    fn decrypt(&self, ciphertext: &[u8]) -> Result<Vec<u8>> {
63        decrypt_digest::<DummyRng, D, MGD>(
64            None,
65            &self.inner,
66            ciphertext,
67            self.label.as_ref().cloned(),
68        )
69    }
70}
71
72impl<D, MGD> RandomizedDecryptor for DecryptingKey<D, MGD>
73where
74    D: Digest,
75    MGD: Digest + FixedOutputReset,
76{
77    fn decrypt_with_rng<R: CryptoRngCore + ?Sized>(
78        &self,
79        rng: &mut R,
80        ciphertext: &[u8],
81    ) -> Result<Vec<u8>> {
82        decrypt_digest::<_, D, MGD>(
83            Some(rng),
84            &self.inner,
85            ciphertext,
86            self.label.as_ref().cloned(),
87        )
88    }
89}
90
91impl<D, MGD> ZeroizeOnDrop for DecryptingKey<D, MGD>
92where
93    D: Digest,
94    MGD: Digest + FixedOutputReset,
95{
96}
rsa/oaep/decrypting_key.rs

rsa/oaep/
decrypting_key.rs
