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//! Traits for parsing objects from PKCS#8 encoded documents
use crate::{Error, PrivateKeyInfo, Result};
#[cfg(feature = "alloc")]
use der::SecretDocument;
#[cfg(feature = "encryption")]
use {
crate::EncryptedPrivateKeyInfo,
rand_core::{CryptoRng, RngCore},
};
#[cfg(feature = "pem")]
use {crate::LineEnding, alloc::string::String, der::zeroize::Zeroizing};
#[cfg(feature = "pem")]
use der::pem::PemLabel;
#[cfg(feature = "std")]
use std::path::Path;
/// Parse a private key object from a PKCS#8 encoded document.
pub trait DecodePrivateKey: Sized {
/// Deserialize PKCS#8 private key from ASN.1 DER-encoded data
/// (binary format).
fn from_pkcs8_der(bytes: &[u8]) -> Result<Self>;
/// Deserialize encrypted PKCS#8 private key from ASN.1 DER-encoded data
/// (binary format) and attempt to decrypt it using the provided password.
#[cfg(feature = "encryption")]
fn from_pkcs8_encrypted_der(bytes: &[u8], password: impl AsRef<[u8]>) -> Result<Self> {
let doc = EncryptedPrivateKeyInfo::try_from(bytes)?.decrypt(password)?;
Self::from_pkcs8_der(doc.as_bytes())
}
/// Deserialize PKCS#8-encoded private key from PEM.
///
/// Keys in this format begin with the following delimiter:
///
/// ```text
/// -----BEGIN PRIVATE KEY-----
/// ```
#[cfg(feature = "pem")]
fn from_pkcs8_pem(s: &str) -> Result<Self> {
let (label, doc) = SecretDocument::from_pem(s)?;
PrivateKeyInfo::validate_pem_label(label)?;
Self::from_pkcs8_der(doc.as_bytes())
}
/// Deserialize encrypted PKCS#8-encoded private key from PEM and attempt
/// to decrypt it using the provided password.
///
/// Keys in this format begin with the following delimiter:
///
/// ```text
/// -----BEGIN ENCRYPTED PRIVATE KEY-----
/// ```
#[cfg(all(feature = "encryption", feature = "pem"))]
fn from_pkcs8_encrypted_pem(s: &str, password: impl AsRef<[u8]>) -> Result<Self> {
let (label, doc) = SecretDocument::from_pem(s)?;
EncryptedPrivateKeyInfo::validate_pem_label(label)?;
Self::from_pkcs8_encrypted_der(doc.as_bytes(), password)
}
/// Load PKCS#8 private key from an ASN.1 DER-encoded file on the local
/// filesystem (binary format).
#[cfg(feature = "std")]
fn read_pkcs8_der_file(path: impl AsRef<Path>) -> Result<Self> {
Self::from_pkcs8_der(SecretDocument::read_der_file(path)?.as_bytes())
}
/// Load PKCS#8 private key from a PEM-encoded file on the local filesystem.
#[cfg(all(feature = "pem", feature = "std"))]
fn read_pkcs8_pem_file(path: impl AsRef<Path>) -> Result<Self> {
let (label, doc) = SecretDocument::read_pem_file(path)?;
PrivateKeyInfo::validate_pem_label(&label)?;
Self::from_pkcs8_der(doc.as_bytes())
}
}
impl<T> DecodePrivateKey for T
where
T: for<'a> TryFrom<PrivateKeyInfo<'a>, Error = Error>,
{
fn from_pkcs8_der(bytes: &[u8]) -> Result<Self> {
Self::try_from(PrivateKeyInfo::try_from(bytes)?)
}
}
/// Serialize a private key object to a PKCS#8 encoded document.
#[cfg(feature = "alloc")]
pub trait EncodePrivateKey {
/// Serialize a [`SecretDocument`] containing a PKCS#8-encoded private key.
fn to_pkcs8_der(&self) -> Result<SecretDocument>;
/// Create an [`SecretDocument`] containing the ciphertext of
/// a PKCS#8 encoded private key encrypted under the given `password`.
#[cfg(feature = "encryption")]
fn to_pkcs8_encrypted_der(
&self,
rng: impl CryptoRng + RngCore,
password: impl AsRef<[u8]>,
) -> Result<SecretDocument> {
EncryptedPrivateKeyInfo::encrypt(rng, password, self.to_pkcs8_der()?.as_bytes())
}
/// Serialize this private key as PEM-encoded PKCS#8 with the given [`LineEnding`].
#[cfg(feature = "pem")]
fn to_pkcs8_pem(&self, line_ending: LineEnding) -> Result<Zeroizing<String>> {
let doc = self.to_pkcs8_der()?;
Ok(doc.to_pem(PrivateKeyInfo::PEM_LABEL, line_ending)?)
}
/// Serialize this private key as an encrypted PEM-encoded PKCS#8 private
/// key using the `provided` to derive an encryption key.
#[cfg(all(feature = "encryption", feature = "pem"))]
fn to_pkcs8_encrypted_pem(
&self,
rng: impl CryptoRng + RngCore,
password: impl AsRef<[u8]>,
line_ending: LineEnding,
) -> Result<Zeroizing<String>> {
let doc = self.to_pkcs8_encrypted_der(rng, password)?;
Ok(doc.to_pem(EncryptedPrivateKeyInfo::PEM_LABEL, line_ending)?)
}
/// Write ASN.1 DER-encoded PKCS#8 private key to the given path
#[cfg(feature = "std")]
fn write_pkcs8_der_file(&self, path: impl AsRef<Path>) -> Result<()> {
Ok(self.to_pkcs8_der()?.write_der_file(path)?)
}
/// Write ASN.1 DER-encoded PKCS#8 private key to the given path
#[cfg(all(feature = "pem", feature = "std"))]
fn write_pkcs8_pem_file(&self, path: impl AsRef<Path>, line_ending: LineEnding) -> Result<()> {
let doc = self.to_pkcs8_der()?;
Ok(doc.write_pem_file(path, PrivateKeyInfo::PEM_LABEL, line_ending)?)
}
}
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