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signatures/common/proof_message.go

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+//
+// Copyright Coinbase, Inc. All Rights Reserved.
+//
+// SPDX-License-Identifier: Apache-2.0
+//
+
+package common
+
+import (
+	"io"
+
+	"github.com/sonr-io/sonr/crypto/core/curves"
+)
+
+// ProofMessage classifies how a message is presented in a proof
+// Either Revealed or Hidden. Hidden has two sub categories:
+// proof specific i.e. the message is only used for this proof or
+// shared i.e. the message should be proved to be common across proofs
+type ProofMessage interface {
+	// IsHidden indicates the message should be hidden
+	IsHidden() bool
+	// GetBlinding is used for hidden messages
+	// blindings can either be proof specific to a signature
+	// or involved with other proofs like boundchecks,
+	// set memberships, or inequalities so the blinding
+	// factor is shared among proofs to produce a common
+	// schnorr linking proof
+	GetBlinding(reader io.Reader) curves.Scalar
+	// GetMessage returns the underlying message
+	GetMessage() curves.Scalar
+}
+
+type RevealedMessage struct {
+	Message curves.Scalar
+}
+
+func (r RevealedMessage) IsHidden() bool {
+	return false
+}
+
+func (r RevealedMessage) GetBlinding(reader io.Reader) curves.Scalar {
+	return nil
+}
+
+func (r RevealedMessage) GetMessage() curves.Scalar {
+	return r.Message
+}
+
+type ProofSpecificMessage struct {
+	Message curves.Scalar
+}
+
+func (ps ProofSpecificMessage) IsHidden() bool {
+	return true
+}
+
+func (ps ProofSpecificMessage) GetBlinding(reader io.Reader) curves.Scalar {
+	return ps.Message.Random(reader)
+}
+
+func (ps ProofSpecificMessage) GetMessage() curves.Scalar {
+	return ps.Message
+}
+
+type SharedBlindingMessage struct {
+	Message, Blinding curves.Scalar
+}
+
+func (ps SharedBlindingMessage) IsHidden() bool {
+	return true
+}
+
+func (ps SharedBlindingMessage) GetBlinding(reader io.Reader) curves.Scalar {
+	return ps.Blinding
+}
+
+func (ps SharedBlindingMessage) GetMessage() curves.Scalar {
+	return ps.Message
+}