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use deno_core::error::AnyError;
use elliptic_curve::AlgorithmParameters;
use elliptic_curve::pkcs8;
use elliptic_curve::pkcs8::der;
use elliptic_curve::pkcs8::der::asn1::*;
use elliptic_curve::pkcs8::der::Decodable as Pkcs8Decodable;
use elliptic_curve::pkcs8::der::Encodable;
use elliptic_curve::pkcs8::der::TagNumber;
use elliptic_curve::pkcs8::AlgorithmIdentifier;
use elliptic_curve::pkcs8::ObjectIdentifier;
use elliptic_curve::pkcs8::PrivateKeyDocument;
use elliptic_curve::pkcs8::PrivateKeyInfo;
use elliptic_curve::zeroize::Zeroizing;
use crate::shared::*;
const VERSION: u8 = 1;
const PUBLIC_KEY_TAG: TagNumber = TagNumber::new(1);
pub struct ECPrivateKey<'a, C: elliptic_curve::Curve> {
pub algorithm: AlgorithmIdentifier<'a>,
pub private_d: elliptic_curve::FieldBytes<C>,
pub encoded_point: &'a [u8],
}
impl<'a, C> ECPrivateKey<'a, C>
where
C: elliptic_curve::Curve + AlgorithmParameters,
{
/// Create a new ECPrivateKey from a serialized private scalar and encoded public key
pub fn from_private_and_public_bytes(
private_d: elliptic_curve::FieldBytes<C>,
encoded_point: &'a [u8],
) -> Self {
Self {
private_d,
encoded_point,
algorithm: C::algorithm_identifier(),
}
}
pub fn named_curve_oid(&self) -> Result<ObjectIdentifier, AnyError> {
let parameters = self
.algorithm
.parameters
.ok_or_else(|| data_error("malformed parameters"))?;
Ok(parameters.oid().unwrap())
}
fn internal_to_pkcs8_der(&self) -> der::Result<Vec<u8>> {
// Shamelessly copied from pkcs8 crate and modified so as
// to not require Arithmetic trait currently missing from p384
let secret_key_field = OctetString::new(&self.private_d)?;
let public_key_bytes = &self.encoded_point;
let public_key_field = ContextSpecific {
tag_number: PUBLIC_KEY_TAG,
value: BitString::new(public_key_bytes)?.into(),
};
let der_message_fields: &[&dyn Encodable] =
&[&VERSION, &secret_key_field, &public_key_field];
let encoded_len =
der::message::encoded_len(der_message_fields)?.try_into()?;
let mut der_message = Zeroizing::new(vec![0u8; encoded_len]);
let mut encoder = der::Encoder::new(&mut der_message);
encoder.message(der_message_fields)?;
encoder.finish()?;
Ok(der_message.to_vec())
}
pub fn to_pkcs8_der(&self) -> Result<PrivateKeyDocument, AnyError> {
let pkcs8_der = self
.internal_to_pkcs8_der()
.map_err(|_| data_error("expected valid PKCS#8 data"))?;
let pki =
pkcs8::PrivateKeyInfo::new(C::algorithm_identifier(), pkcs8_der.as_ref());
Ok(pki.to_der())
}
}
impl<'a, C: elliptic_curve::Curve> TryFrom<&'a [u8]> for ECPrivateKey<'a, C> {
type Error = AnyError;
fn try_from(bytes: &'a [u8]) -> Result<ECPrivateKey<C>, AnyError> {
let pk_info = PrivateKeyInfo::from_der(bytes)
.map_err(|_| data_error("expected valid PKCS#8 data"))?;
Self::try_from(pk_info)
}
}
impl<'a, C: elliptic_curve::Curve> TryFrom<PrivateKeyInfo<'a>>
for ECPrivateKey<'a, C>
{
type Error = AnyError;
fn try_from(
pk_info: PrivateKeyInfo<'a>,
) -> Result<ECPrivateKey<'a, C>, AnyError> {
let any = der::asn1::Any::from_der(pk_info.private_key).map_err(|_| {
data_error("expected valid PrivateKeyInfo private_key der")
})?;
if pk_info.algorithm.oid != elliptic_curve::ALGORITHM_OID {
return Err(data_error("unsupported algorithm"));
}
any
.sequence(|decoder| {
// ver
if decoder.uint8()? != VERSION {
return Err(der::Tag::Integer.value_error());
}
// private_key
let priv_key = decoder.octet_string()?.as_bytes();
let mut private_d = elliptic_curve::FieldBytes::<C>::default();
if priv_key.len() != private_d.len() {
return Err(der::Tag::Sequence.value_error());
};
private_d.copy_from_slice(priv_key);
let public_key = decoder
.context_specific(PUBLIC_KEY_TAG)?
.ok_or_else(|| {
der::Tag::ContextSpecific(PUBLIC_KEY_TAG).value_error()
})?
.bit_string()?;
Ok(Self {
private_d,
encoded_point: public_key.as_bytes(),
algorithm: pk_info.algorithm,
})
})
.map_err(|_| data_error("expected valid PrivateKeyInfo private_key der"))
}
}
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