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use age_core::format::{FileKey, Stanza};
use secrecy::SecretString;
use std::io::Read;
use super::Nonce;
use crate::{
error::DecryptError,
format::Header,
keys::v1_payload_key,
primitives::stream::{PayloadKey, Stream, StreamReader},
scrypt, Identity,
};
#[cfg(feature = "async")]
use futures::io::AsyncRead;
struct BaseDecryptor<R> {
input: R,
header: Header,
nonce: Nonce,
}
impl<R> BaseDecryptor<R> {
fn obtain_payload_key<F>(&self, mut filter: F) -> Result<PayloadKey, DecryptError>
where
F: FnMut(&[Stanza]) -> Option<Result<FileKey, DecryptError>>,
{
match &self.header {
Header::V1(header) => filter(&header.recipients)
.unwrap_or(Err(DecryptError::NoMatchingKeys))
.and_then(|file_key| v1_payload_key(&file_key, header, &self.nonce)),
Header::Unknown(_) => unreachable!(),
}
}
}
pub struct RecipientsDecryptor<R>(BaseDecryptor<R>);
impl<R> RecipientsDecryptor<R> {
pub(super) fn new(input: R, header: Header, nonce: Nonce) -> Self {
RecipientsDecryptor(BaseDecryptor {
input,
header,
nonce,
})
}
fn obtain_payload_key(
&self,
mut identities: impl Iterator<Item = Box<dyn Identity>>,
) -> Result<PayloadKey, DecryptError> {
self.0
.obtain_payload_key(|r| identities.find_map(|key| key.unwrap_stanzas(r)))
}
}
impl<R: Read> RecipientsDecryptor<R> {
pub fn decrypt(
self,
identities: impl Iterator<Item = Box<dyn Identity>>,
) -> Result<StreamReader<R>, DecryptError> {
self.obtain_payload_key(identities)
.map(|payload_key| Stream::decrypt(payload_key, self.0.input))
}
}
#[cfg(feature = "async")]
#[cfg_attr(docsrs, doc(cfg(feature = "async")))]
impl<R: AsyncRead + Unpin> RecipientsDecryptor<R> {
pub fn decrypt_async(
self,
identities: impl Iterator<Item = Box<dyn Identity>>,
) -> Result<StreamReader<R>, DecryptError> {
self.obtain_payload_key(identities)
.map(|payload_key| Stream::decrypt_async(payload_key, self.0.input))
}
}
pub struct PassphraseDecryptor<R>(BaseDecryptor<R>);
impl<R> PassphraseDecryptor<R> {
pub(super) fn new(input: R, header: Header, nonce: Nonce) -> Self {
PassphraseDecryptor(BaseDecryptor {
input,
header,
nonce,
})
}
fn obtain_payload_key(
&self,
passphrase: &SecretString,
max_work_factor: Option<u8>,
) -> Result<PayloadKey, DecryptError> {
let identity = scrypt::Identity {
passphrase,
max_work_factor,
};
self.0.obtain_payload_key(|r| identity.unwrap_stanzas(r))
}
}
impl<R: Read> PassphraseDecryptor<R> {
pub fn decrypt(
self,
passphrase: &SecretString,
max_work_factor: Option<u8>,
) -> Result<StreamReader<R>, DecryptError> {
self.obtain_payload_key(passphrase, max_work_factor)
.map(|payload_key| Stream::decrypt(payload_key, self.0.input))
}
}
#[cfg(feature = "async")]
#[cfg_attr(docsrs, doc(cfg(feature = "async")))]
impl<R: AsyncRead + Unpin> PassphraseDecryptor<R> {
pub fn decrypt_async(
self,
passphrase: &SecretString,
max_work_factor: Option<u8>,
) -> Result<StreamReader<R>, DecryptError> {
self.obtain_payload_key(passphrase, max_work_factor)
.map(|payload_key| Stream::decrypt_async(payload_key, self.0.input))
}
}
pub trait Callbacks {
fn request_passphrase(&self, description: &str) -> Option<SecretString>;
}