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math/big: add (*Int).FillBytes

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Replaced almost every use of Bytes with FillBytes.

Note that the approved proposal was for

    func (*Int) FillBytes(buf []byte)

while this implements

    func (*Int) FillBytes(buf []byte) []byte

because the latter was far nicer to use in all callsites.

Fixes #35833

Change-Id: Ia912df123e5d79b763845312ea3d9a8051343c0a
Reviewed-on: https://go-review.googlesource.com/c/go/+/230397
Reviewed-by: Robert Griesemer <gri@golang.org>
This commit is contained in:
Filippo Valsorda 2020-04-27 21:52:38 -04:00
parent 2f2a543ff4
commit dac6a2bce8
1 changed files with 2 additions and 5 deletions
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7
key_schedule.go
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@ -173,11 +173,8 @@ func (p *nistParameters) SharedKey(peerPublicKey []byte) []byte {
}
xShared, _ := curve.ScalarMult(x, y, p.privateKey)
sharedKey := make([]byte, (curve.Params().BitSize+7)>>3)
xBytes := xShared.Bytes()
copy(sharedKey[len(sharedKey)-len(xBytes):], xBytes)
return sharedKey
sharedKey := make([]byte, (curve.Params().BitSize+7)/8)
return xShared.FillBytes(sharedKey)
}
type x25519Parameters struct {