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/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
//! EC helper functions.
use crate::{Error, Result};
use nss_rs::der;
#[cfg(feature = "xpcom")]
use nss_rs::ec::{convert_to_public, EcdhKeypair, EcdhPrivateKey};
pub const P256_X962_LENGTH: usize = 65;
const P256_X962_DER_LENGTH: usize = SECP256R1_DER_PUBKEY_HEADER.len() + P256_X962_LENGTH;
/// Static DER header for an uncompressed SEC.1 P-256 point in DER format.
// TODO: rewrite with `concat_bytes!` once stable
const SECP256R1_DER_PUBKEY_HEADER: [u8; 26] = [
// SubjectPublicKeyInfo
der::TAG_SEQUENCE,
(24 + P256_X962_LENGTH) as u8,
// algorithm: AlgorithmIdentifier
der::TAG_SEQUENCE,
0x13,
// algorithm
der::TAG_OBJECT_ID,
0x07,
// OID_EC_PUBLIC_KEY_BYTES
0x2a,
0x86,
0x48,
0xce,
0x3d,
0x02,
0x01,
// parameters
der::TAG_OBJECT_ID,
0x08,
// OID_SECP256R1_BYTES
0x2a,
0x86,
0x48,
0xce,
0x3d,
0x03,
0x01,
0x07,
// subjectPublicKey
der::TAG_BIT_STRING,
(P256_X962_LENGTH + 1) as u8,
0x00,
];
#[cfg(feature = "xpcom")]
/// Convert an [`EcdhPrivateKey`] into an [`EcdhKeypair`].
pub fn convert_to_keypair(private: EcdhPrivateKey) -> Result<EcdhKeypair> {
let public = convert_to_public(&private)?;
Ok(EcdhKeypair { private, public })
}
/// Convert an uncompressed SEC.1 P-256 point into DER format for NSS.
pub fn sec1_ec2_key_to_der(key: &[u8; P256_X962_LENGTH]) -> Result<Vec<u8>> {
if key[0] != 0x04 {
// incorrect format
return Err(Error::InvalidArgument);
}
let mut o = Vec::with_capacity(P256_X962_DER_LENGTH);
o.extend_from_slice(&SECP256R1_DER_PUBKEY_HEADER);
o.extend_from_slice(key);
Ok(o)
}