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elliptic-curve: add SecretKey::diffie_hellman #2248

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Merged
tarcieri merged 1 commit into from
Jan 31, 2026
+14 −0
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elliptic-curve: add SecretKey::diffie_hellman #2248

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14 changes: 14 additions & 0 deletions elliptic-curve/src/secret_key.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -19,6 +19,9 @@ use zeroize::{Zeroize, ZeroizeOnDrop, Zeroizing};
#[cfg(feature = "arithmetic")]
use crate::{CurveArithmetic, NonZeroScalar, PublicKey};

#[cfg(feature = "ecdh")]
use crate::ecdh;

#[cfg(feature = "pem")]
use pem_rfc7468::{self as pem, PemLabel};

Expand Down Expand Up @@ -172,6 +175,17 @@ where
self.inner.to_bytes()
}

/// Perform Elliptic Curve Diffie-Hellman with the given public key, returning a shared secret.
///
/// See the documentation in the [`ecdh`] module for more information.
#[cfg(feature = "ecdh")]
pub fn diffie_hellman(self, public_key: &PublicKey<C>) -> ecdh::SharedSecret<C>
where
C: CurveArithmetic,
{
ecdh::diffie_hellman(self.to_nonzero_scalar(), public_key.as_affine())
}

/// Deserialize secret key encoded in the SEC1 ASN.1 DER `ECPrivateKey` format.
#[cfg(feature = "sec1")]
pub fn from_sec1_der(der_bytes: &[u8]) -> Result<Self>
Expand Down