35 lines
1.5 KiB
Rust
35 lines
1.5 KiB
Rust
use p256::ecdh::EphemeralSecret;
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use rand::rngs::OsRng;
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use rust_util::{opt_result, XResult};
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use p256::pkcs8::EncodePublicKey;
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use p256::{EncodedPoint, PublicKey};
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use p256::elliptic_curve::sec1::FromEncodedPoint;
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// use p256::elliptic_curve::sec1::{FromEncodedPoint, ToEncodedPoint};
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// #[derive(Debug)]
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// pub struct EphemeralKeyBytes(EncodedPoint);
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//
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// impl EphemeralKeyBytes {
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// pub fn from_public_key(epk: &PublicKey) -> Self {
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// EphemeralKeyBytes(epk.to_encoded_point(true))
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// }
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//
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// pub fn decompress(&self) -> EncodedPoint {
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// // EphemeralKeyBytes is a valid compressed encoding by construction.
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// let p = PublicKey::from_encoded_point(&self.0).unwrap();
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// p.to_encoded_point(false)
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// }
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// }
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pub fn compute_shared_secret(public_key_point_hex: &str) -> XResult<(Vec<u8>, Vec<u8>)> {
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let public_key_point_bytes = opt_result!(hex::decode(public_key_point_hex), "Parse public key point hex failed: {}");
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let encoded_point = opt_result!(EncodedPoint::from_bytes(public_key_point_bytes), "Parse public key point failed: {}");
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let public_key = PublicKey::from_encoded_point(&encoded_point).unwrap();
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let esk = EphemeralSecret::random(&mut OsRng);
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let epk = esk.public_key();
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let shared_secret = esk.diffie_hellman(&public_key);
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let epk_public_key_der = opt_result!(epk.to_public_key_der(), "Convert epk to SPKI failed: {}");
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Ok((shared_secret.raw_secret_bytes().as_slice().to_vec(), epk_public_key_der.to_vec()))
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} |