openpgp: Remove superfluous clamping.

  - Asymmetric::x25519_generate_key generates an X25519 key.  Clamping
    is not necessary here: X25519 mandates implicit clamping when
    decrypting.

1 files changed, 1 insertions, 9 deletions

diff --git a/openpgp/src/crypto/backend/botan/asymmetric.rs b/openpgp/src/crypto/backend/botan/asymmetric.rs
index 90be41c2..4dd2800c 100644
--- a/openpgp/src/crypto/backend/botan/asymmetric.rs
+++ b/openpgp/src/crypto/backend/botan/asymmetric.rs
@@ -64,15 +64,7 @@ impl Asymmetric for super::Backend {
         let secret = Privkey::create("Curve25519", "", &mut rng)?;
         let mut public = [0u8; 32];
         public.copy_from_slice(&secret.pubkey()?.get_x25519_key()?);
-        let mut secret: Protected = secret.get_x25519_key()?.into();
-
-        // Clamp the scalar.  X25519 does the clamping implicitly, but
-        // OpenPGP's ECDH over Curve25519 requires the secret to be
-        // clamped.
-        secret[0] &= 0b1111_1000;
-        secret[31] &= !0b1000_0000;
-        secret[31] |= 0b0100_0000;
-
+        let secret: Protected = secret.get_x25519_key()?.into();
         Ok((secret, public))
     }