mirror of
https://source.quilibrium.com/quilibrium/ceremonyclient.git
synced 2024-11-20 15:15:18 +00:00
45 lines
957 B
Go
45 lines
957 B
Go
//
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// Copyright Coinbase, Inc. All Rights Reserved.
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//
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// SPDX-License-Identifier: Apache-2.0
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//
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package internal
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import (
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"crypto/elliptic"
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"math/big"
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"filippo.io/edwards25519"
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)
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func CalcFieldSize(curve elliptic.Curve) int {
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bits := curve.Params().BitSize
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return (bits + 7) / 8
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}
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func ReverseScalarBytes(inBytes []byte) []byte {
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outBytes := make([]byte, len(inBytes))
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for i, j := 0, len(inBytes)-1; j >= 0; i, j = i+1, j-1 {
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outBytes[i] = inBytes[j]
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}
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return outBytes
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}
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func BigInt2Ed25519Point(y *big.Int) (*edwards25519.Point, error) {
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b := y.Bytes()
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var arr [32]byte
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copy(arr[32-len(b):], b)
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return edwards25519.NewIdentityPoint().SetBytes(arr[:])
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}
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func BigInt2Ed25519Scalar(x *big.Int) (*edwards25519.Scalar, error) {
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// big.Int is big endian; ed25519 assumes little endian encoding
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kBytes := ReverseScalarBytes(x.Bytes())
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var arr [32]byte
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copy(arr[:], kBytes)
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return edwards25519.NewScalar().SetCanonicalBytes(arr[:])
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}
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