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28 lines
691 B
Go
28 lines
691 B
Go
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//
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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 frost
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import (
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"crypto/sha512"
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"source.quilibrium.com/quilibrium/monorepo/nekryptology/pkg/core/curves"
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)
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type ChallengeDerive interface {
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DeriveChallenge(msg []byte, pubKey curves.Point, r curves.Point) (curves.Scalar, error)
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}
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type Ed25519ChallengeDeriver struct{}
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func (ed Ed25519ChallengeDeriver) DeriveChallenge(msg []byte, pubKey curves.Point, r curves.Point) (curves.Scalar, error) {
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h := sha512.New()
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_, _ = h.Write(r.ToAffineCompressed())
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_, _ = h.Write(pubKey.ToAffineCompressed())
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_, _ = h.Write(msg)
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return new(curves.ScalarEd25519).SetBytesWide(h.Sum(nil))
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}
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