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Avoid signature padding when not required

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This commit is contained in:
Olivier Chéron 2020-02-04 21:39:50 +01:00
parent 633879f801
commit 6f70986cb1
1 changed files with 6 additions and 4 deletions
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10
Crypto/PubKey/EdDSA.hs
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@ -178,10 +178,12 @@ encodeSignature :: EllipticCurveEdDSA curve
=> proxy curve
-> (Bytes, Point curve, Scalar curve)
-> Signature curve
encodeSignature prx (bsR, _, sS) =
let bsS = encodeScalarLE prx sS :: Bytes
len0 = signatureSize prx - B.length bsR - B.length bsS
in Signature $ B.concat [ bsR, bsS, B.zero len0 ]
encodeSignature prx (bsR, _, sS) = Signature $
if len0 > 0 then B.concat [ bsR, bsS, pad0 ] else B.append bsR bsS
where
bsS = encodeScalarLE prx sS
len0 = signatureSize prx - B.length bsR - B.length bsS
pad0 = B.zero len0
decodeSignature :: EllipticCurveEdDSA curve
=> proxy curve