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use crate::{DecodePrivateKey, EncodePrivateKey, Error, PrivateKeyInfo, Result};
use alloc::vec::Vec;
use core::fmt;
use der::{Decodable, Document};
use zeroize::{Zeroize, Zeroizing};
#[cfg(feature = "encryption")]
use {
crate::{EncryptedPrivateKeyDocument, EncryptedPrivateKeyInfo},
pkcs5::pbes2,
rand_core::{CryptoRng, RngCore},
};
#[cfg(feature = "pem")]
use {
alloc::string::String,
core::str::FromStr,
der::pem::{self, LineEnding},
};
#[cfg(feature = "std")]
use std::path::Path;
#[derive(Clone)]
#[cfg_attr(docsrs, doc(cfg(feature = "alloc")))]
pub struct PrivateKeyDocument(Zeroizing<Vec<u8>>);
impl<'a> Document<'a> for PrivateKeyDocument {
type Message = PrivateKeyInfo<'a>;
const SENSITIVE: bool = true;
}
impl PrivateKeyDocument {
#[cfg(feature = "encryption")]
#[cfg_attr(docsrs, doc(cfg(feature = "encryption")))]
pub fn encrypt(
&self,
mut rng: impl CryptoRng + RngCore,
password: impl AsRef<[u8]>,
) -> Result<EncryptedPrivateKeyDocument> {
let mut salt = [0u8; 16];
rng.fill_bytes(&mut salt);
let mut iv = [0u8; 16];
rng.fill_bytes(&mut iv);
let pbes2_params = pbes2::Parameters::scrypt_aes256cbc(Default::default(), &salt, &iv)?;
self.encrypt_with_params(pbes2_params, password)
}
#[cfg(feature = "encryption")]
#[cfg_attr(docsrs, doc(cfg(feature = "encryption")))]
pub fn encrypt_with_params(
&self,
pbes2_params: pbes2::Parameters<'_>,
password: impl AsRef<[u8]>,
) -> Result<EncryptedPrivateKeyDocument> {
let encrypted_data = pbes2_params.encrypt(password, self.as_ref())?;
EncryptedPrivateKeyInfo {
encryption_algorithm: pbes2_params.into(),
encrypted_data: &encrypted_data,
}
.try_into()
}
}
impl DecodePrivateKey for PrivateKeyDocument {
fn from_pkcs8_der(bytes: &[u8]) -> Result<Self> {
Ok(Self::from_der(bytes)?)
}
#[cfg(feature = "pem")]
#[cfg_attr(docsrs, doc(cfg(feature = "pem")))]
fn from_pkcs8_pem(s: &str) -> Result<Self> {
Ok(Self::from_pem(s)?)
}
#[cfg(feature = "std")]
#[cfg_attr(docsrs, doc(cfg(feature = "std")))]
fn read_pkcs8_der_file(path: impl AsRef<Path>) -> Result<Self> {
Ok(Self::read_der_file(path)?)
}
#[cfg(all(feature = "pem", feature = "std"))]
#[cfg_attr(docsrs, doc(cfg(feature = "pem")))]
#[cfg_attr(docsrs, doc(cfg(feature = "std")))]
fn read_pkcs8_pem_file(path: impl AsRef<Path>) -> Result<Self> {
Ok(Self::read_pem_file(path)?)
}
}
impl EncodePrivateKey for PrivateKeyDocument {
fn to_pkcs8_der(&self) -> Result<PrivateKeyDocument> {
Ok(self.clone())
}
#[cfg(feature = "pem")]
#[cfg_attr(docsrs, doc(cfg(feature = "pem")))]
fn to_pkcs8_pem(&self, line_ending: LineEnding) -> Result<Zeroizing<String>> {
Ok(Zeroizing::new(self.to_pem(line_ending)?))
}
#[cfg(feature = "std")]
#[cfg_attr(docsrs, doc(cfg(feature = "std")))]
fn write_pkcs8_der_file(&self, path: impl AsRef<Path>) -> Result<()> {
Ok(self.write_der_file(path)?)
}
#[cfg(all(feature = "pem", feature = "std"))]
#[cfg_attr(docsrs, doc(cfg(feature = "pem")))]
#[cfg_attr(docsrs, doc(cfg(feature = "std")))]
fn write_pkcs8_pem_file(&self, path: impl AsRef<Path>, line_ending: LineEnding) -> Result<()> {
Ok(self.write_pem_file(path, line_ending)?)
}
}
impl AsRef<[u8]> for PrivateKeyDocument {
fn as_ref(&self) -> &[u8] {
self.0.as_ref()
}
}
impl TryFrom<PrivateKeyInfo<'_>> for PrivateKeyDocument {
type Error = Error;
fn try_from(private_key_info: PrivateKeyInfo<'_>) -> Result<PrivateKeyDocument> {
Self::try_from(&private_key_info)
}
}
impl TryFrom<&PrivateKeyInfo<'_>> for PrivateKeyDocument {
type Error = Error;
fn try_from(private_key_info: &PrivateKeyInfo<'_>) -> Result<PrivateKeyDocument> {
Ok(Self::from_msg(private_key_info)?)
}
}
impl TryFrom<&[u8]> for PrivateKeyDocument {
type Error = Error;
fn try_from(bytes: &[u8]) -> Result<Self> {
PrivateKeyDocument::from_pkcs8_der(bytes)
}
}
impl TryFrom<Vec<u8>> for PrivateKeyDocument {
type Error = der::Error;
fn try_from(mut bytes: Vec<u8>) -> der::Result<Self> {
if let Err(err) = PrivateKeyInfo::from_der(bytes.as_slice()) {
bytes.zeroize();
return Err(err);
}
Ok(Self(Zeroizing::new(bytes)))
}
}
impl fmt::Debug for PrivateKeyDocument {
fn fmt(&self, fmt: &mut fmt::Formatter<'_>) -> fmt::Result {
fmt.debug_tuple("PrivateKeyDocument")
.field(&self.decode())
.finish()
}
}
#[cfg(feature = "pem")]
#[cfg_attr(docsrs, doc(cfg(feature = "pem")))]
impl FromStr for PrivateKeyDocument {
type Err = Error;
fn from_str(s: &str) -> Result<Self> {
Self::from_pkcs8_pem(s)
}
}
#[cfg(feature = "pem")]
#[cfg_attr(docsrs, doc(cfg(feature = "pem")))]
impl pem::PemLabel for PrivateKeyDocument {
const TYPE_LABEL: &'static str = "PRIVATE KEY";
}