| use 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; |
| |
| /// Decryption key for PKCS#1 v1.5 decryption as described in [RFC8017 § 7.1]. |
| /// |
| /// [RFC8017 § 7.1]: https://datatracker.ietf.org/doc/html/rfc8017#section-7.1 |
| #[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, |
| { |
| /// Create a new verifying key from an RSA public key. |
| pub fn new(key: RsaPrivateKey) -> Self { |
| Self { |
| inner: key, |
| label: None, |
| phantom: Default::default(), |
| mg_phantom: Default::default(), |
| } |
| } |
| |
| /// Create a new verifying key from an RSA public key using provided label |
| 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, |
| { |
| } |