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Use the MPI::value_padded() method for left-padding.

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This commit is contained in:
Heiko Schaefer 2021-10-05 17:11:52 +02:00
parent 40c52c7f3a
commit ddf62dbfe2
3 changed files with 4 additions and 17 deletions
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2
openpgp-card-sequoia/Cargo.toml
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@ -12,7 +12,7 @@ repository = "https://gitlab.com/hkos/openpgp-card"
documentation = "https://docs.rs/crate/openpgp-card-sequoia"
[dependencies]
sequoia-openpgp = "1.3"
sequoia-openpgp = "1.4"
nettle = "7"
openpgp-card = { path = "../openpgp-card", version = "0.0.4" }
openpgp-card-pcsc = { path = "../pcsc", version = "0.0.4" }

6
openpgp-card-sequoia/src/privkey.rs
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@ -225,9 +225,9 @@ impl EccKey for SqEccKey {
fn get_private(&self) -> Vec<u8> {
// FIXME: padding for 25519?
match self.curve {
Curve::NistP256 => util::left_zero_pad(self.private.value(), 0x20),
Curve::NistP384 => util::left_zero_pad(self.private.value(), 0x30),
Curve::NistP521 => util::left_zero_pad(self.private.value(), 0x42),
Curve::NistP256 => self.private.value_padded(0x20).to_vec(),
Curve::NistP384 => self.private.value_padded(0x30).to_vec(),
Curve::NistP521 => self.private.value_padded(0x42).to_vec(),
_ => self.private.value().to_vec(),
}
}

13
openpgp-card-sequoia/src/util.rs
View file

@ -305,16 +305,3 @@ pub fn decrypt(
Ok(decrypted)
}
/// This fn prepends zeros to `value` so that the resulting Vec<u8> has
/// len `size`.
///
/// (Leading zero-bytes may be stripped from MPIs, this fn is a helper for
/// re-creating the non-stripped representation of an MPI)
pub(crate) fn left_zero_pad(value: &[u8], size: usize) -> Vec<u8> {
let pad = size - value.len();
let mut res = vec![0; pad];
res.extend_from_slice(value);
res
}