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//! Traits for parsing objects from SEC1 encoded documents
use crate::Result;
#[cfg(feature = "alloc")]
use der::SecretDocument;
#[cfg(feature = "pem")]
use {crate::LineEnding, alloc::string::String, der::pem::PemLabel};
#[cfg(feature = "pkcs8")]
use {
crate::{EcPrivateKey, ALGORITHM_OID},
der::Decode,
};
#[cfg(feature = "std")]
use std::path::Path;
#[cfg(feature = "pem")]
use zeroize::Zeroizing;
/// Parse an [`EcPrivateKey`] from a SEC1-encoded document.
#[cfg_attr(docsrs, doc(cfg(feature = "der")))]
pub trait DecodeEcPrivateKey: Sized {
/// Deserialize SEC1 private key from ASN.1 DER-encoded data
/// (binary format).
fn from_sec1_der(bytes: &[u8]) -> Result<Self>;
/// Deserialize SEC1-encoded private key from PEM.
///
/// Keys in this format begin with the following:
///
/// ```text
/// -----BEGIN EC PRIVATE KEY-----
/// ```
#[cfg(feature = "pem")]
#[cfg_attr(docsrs, doc(cfg(feature = "pem")))]
fn from_sec1_pem(s: &str) -> Result<Self> {
let (label, doc) = SecretDocument::from_pem(s)?;
EcPrivateKey::validate_pem_label(label)?;
Self::from_sec1_der(doc.as_bytes())
}
/// Load SEC1 private key from an ASN.1 DER-encoded file on the local
/// filesystem (binary format).
#[cfg(feature = "std")]
#[cfg_attr(docsrs, doc(cfg(feature = "std")))]
fn read_sec1_der_file(path: impl AsRef<Path>) -> Result<Self> {
Self::from_sec1_der(SecretDocument::read_der_file(path)?.as_bytes())
}
/// Load SEC1 private key from a PEM-encoded file on the local filesystem.
#[cfg(all(feature = "pem", feature = "std"))]
#[cfg_attr(docsrs, doc(cfg(feature = "pem")))]
#[cfg_attr(docsrs, doc(cfg(feature = "std")))]
fn read_sec1_pem_file(path: impl AsRef<Path>) -> Result<Self> {
let (label, doc) = SecretDocument::read_pem_file(path)?;
EcPrivateKey::validate_pem_label(&label)?;
Self::from_sec1_der(doc.as_bytes())
}
}
/// Serialize a [`EcPrivateKey`] to a SEC1 encoded document.
#[cfg(feature = "alloc")]
#[cfg_attr(docsrs, doc(cfg(all(feature = "alloc", feature = "der"))))]
pub trait EncodeEcPrivateKey {
/// Serialize a [`SecretDocument`] containing a SEC1-encoded private key.
fn to_sec1_der(&self) -> Result<SecretDocument>;
/// Serialize this private key as PEM-encoded SEC1 with the given [`LineEnding`].
///
/// To use the OS's native line endings, pass `Default::default()`.
#[cfg(feature = "pem")]
#[cfg_attr(docsrs, doc(cfg(feature = "pem")))]
fn to_sec1_pem(&self, line_ending: LineEnding) -> Result<Zeroizing<String>> {
let doc = self.to_sec1_der()?;
Ok(doc.to_pem(EcPrivateKey::PEM_LABEL, line_ending)?)
}
/// Write ASN.1 DER-encoded SEC1 private key to the given path.
#[cfg(feature = "std")]
#[cfg_attr(docsrs, doc(cfg(feature = "std")))]
fn write_sec1_der_file(&self, path: impl AsRef<Path>) -> Result<()> {
Ok(self.to_sec1_der()?.write_der_file(path)?)
}
/// Write ASN.1 DER-encoded SEC1 private key to the given path.
#[cfg(all(feature = "pem", feature = "std"))]
#[cfg_attr(docsrs, doc(cfg(feature = "pem")))]
#[cfg_attr(docsrs, doc(cfg(feature = "std")))]
fn write_sec1_pem_file(&self, path: impl AsRef<Path>, line_ending: LineEnding) -> Result<()> {
let doc = self.to_sec1_der()?;
Ok(doc.write_pem_file(path, EcPrivateKey::PEM_LABEL, line_ending)?)
}
}
#[cfg(feature = "pkcs8")]
#[cfg_attr(docsrs, doc(cfg(feature = "pkcs8")))]
impl<T: pkcs8::DecodePrivateKey> DecodeEcPrivateKey for T {
fn from_sec1_der(private_key: &[u8]) -> Result<Self> {
let params_oid = EcPrivateKey::from_der(private_key)?
.parameters
.and_then(|params| params.named_curve());
let algorithm = pkcs8::AlgorithmIdentifier {
oid: ALGORITHM_OID,
parameters: params_oid.as_ref().map(Into::into),
};
Ok(Self::try_from(pkcs8::PrivateKeyInfo {
algorithm,
private_key,
public_key: None,
})?)
}
}
#[cfg(all(feature = "alloc", feature = "pkcs8"))]
#[cfg_attr(docsrs, doc(cfg(all(feature = "alloc", feature = "pkcs8"))))]
impl<T: pkcs8::EncodePrivateKey> EncodeEcPrivateKey for T {
fn to_sec1_der(&self) -> Result<SecretDocument> {
let doc = self.to_pkcs8_der()?;
let pkcs8_key = pkcs8::PrivateKeyInfo::from_der(doc.as_bytes())?;
pkcs8_key.algorithm.assert_algorithm_oid(ALGORITHM_OID)?;
let mut pkcs1_key = EcPrivateKey::from_der(pkcs8_key.private_key)?;
pkcs1_key.parameters = Some(pkcs8_key.algorithm.parameters_oid()?.into());
pkcs1_key.try_into()
}
}
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