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btcec: add IsEquivalentPubKeys helper method #2423

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btcec: add IsEquivalentPubKeys helper method #2423

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14 changes: 14 additions & 0 deletions btcec/pubkey.go
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Original file line number Diff line number Diff line change
Expand Up @@ -5,6 +5,9 @@
package btcec

import (
"bytes"

"github.com/btcsuite/btcd/btcec/v2/schnorr"
secp "github.com/decred/dcrd/dcrec/secp256k1/v4"
)

Expand Down Expand Up @@ -52,6 +55,17 @@ func NewPublicKey(x, y *FieldVal) *PublicKey {
return secp.NewPublicKey(x, y)
}

// IsEquivalentPubKeys reports whether two public keys are equivalent when
// compared in their BIP340-serialized form. This avoids issues with multiple
// encodings of the same elliptic curve point, since BIP340 serialization
// provides a unique, canonical byte representation.
func IsEquivalentPubKeys(a, b *PublicKey) bool {
return bytes.Equal(
schnorr.SerializePubKey(a),
schnorr.SerializePubKey(b),
)
}

// SerializedKey is a type for representing a public key in its compressed
// serialized form.
//
Expand Down
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