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Handle Gnuk's return format for NistP256 decryption

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This commit is contained in:
Heiko Schaefer 2021-07-20 17:38:15 +02:00
parent 2b221fa76b
commit 6c563b230b
1 changed files with 8 additions and 1 deletions
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9
openpgp-card-sequoia/src/decryptor.rs
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@ -112,7 +112,14 @@ impl<'a> crypto::Decryptor for CardDecryptor<'a> {
};
// Decryption operation on the card
let dec = self.ca.decrypt(dm)?;
let mut dec = self.ca.decrypt(dm)?;
// Specifically handle return value from Gnuk
// (Gnuk returns a leading '0x04' byte and
// an additional 32 trailing bytes)
if curve == &Curve::NistP256 && dec.len() == 65 {
dec = dec[1..33].to_vec();
}
#[allow(non_snake_case)]
let S: openpgp::crypto::mem::Protected = dec.into();