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pv/req: Move constant out of function definition

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This makes it possible to reuse the constant. In addition, change the
type from i32 to usize since the value describes a size.

Signed-off-by: Marc Hartmayer <mhartmay@linux.ibm.com>
Reviewed-by: Steffen Eiden <seiden@linux.ibm.com>
Signed-off-by: Jan Höppner <hoeppner@linux.ibm.com>
This commit is contained in:
Marc Hartmayer
2024-10-14 12:18:54 +00:00
committed by Jan Höppner
parent 96dbabae8d
commit 89f475cee1
1 changed files with 4 additions and 3 deletions
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7
rust/pv/src/req.rs
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@@ -275,16 +275,17 @@ impl AsRef<[u8]> for EcdhPubkeyCoord {
}
}
const ECDH_PUB_KEY_COORD_POINT_SIZE: usize = 0x50;
/// Get the pub ECDH coordinates in the format the Ultravisor expects it:
/// The two coordinates are padded to 80 bytes each.
fn get_pub_ecdh_points(pkey: &EcPointRef, grp: &EcGroupRef) -> Result<[u8; 160], ErrorStack> {
const ECDH_PUB_KEY_COORD_POINT_SIZE: i32 = 0x50;
let mut x = BigNum::new()?;
let mut y = BigNum::new()?;
let mut bn_ctx = BigNumContext::new()?;
pkey.affine_coordinates(grp, &mut x, &mut y, &mut bn_ctx)?;
let mut coord: Vec<u8> = x.to_vec_padded(ECDH_PUB_KEY_COORD_POINT_SIZE)?;
coord.append(&mut y.to_vec_padded(ECDH_PUB_KEY_COORD_POINT_SIZE)?);
let mut coord: Vec<u8> = x.to_vec_padded(ECDH_PUB_KEY_COORD_POINT_SIZE as i32)?;
coord.append(&mut y.to_vec_padded(ECDH_PUB_KEY_COORD_POINT_SIZE as i32)?);
Ok(coord.try_into().unwrap())
}