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https://github.com/luxfi/utxo.git
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zeekay
ae673e7656
Adds four new Fx (feature-extension) packages for X-Chain UTXO signing schemes beyond secp256k1: - ed25519fx — Ed25519 (EdDSA on Curve25519) - schnorrfx — Schnorr (classical) - secp256r1fx — P-256 / NIST - slhdsafx — SLH-DSA (FIPS 205 hash-based PQ) Plus mldsafx updates to match (ML-DSA / FIPS 204 lattice PQ). Each fx package exports Fx, Credential, Keychain, OutputOwners, Input following the existing secp256k1fx pattern. Gitignore .DS_Store.
47 lines
1.2 KiB
Go
47 lines
1.2 KiB
Go
// Copyright (C) 2019-2025, Lux Industries, Inc. All rights reserved.
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// See the file LICENSE for licensing terms.
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package schnorrfx
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import (
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"errors"
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"github.com/luxfi/math"
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"github.com/luxfi/utils"
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)
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const (
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// CostPerSignature is the compute cost per BIP-340 Schnorr verification.
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// BIP-340 verify is comparable to secp256k1 ECDSA verify, but slightly
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// faster because there's no recovery. Set to 1000 (same as Ed25519, same
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// order as secp256k1).
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CostPerSignature uint64 = 1000
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)
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var (
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ErrNilInput = errors.New("nil input")
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ErrInputIndicesNotSortedUnique = errors.New("address indices not sorted and unique")
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)
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// Input references signature indices into the credential for spending.
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type Input struct {
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SigIndices []uint32 `serialize:"true" json:"signatureIndices"`
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}
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func (in *Input) Cost() (uint64, error) {
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numSigs := uint64(len(in.SigIndices))
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return math.Mul64(numSigs, CostPerSignature)
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}
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// Verify this input is syntactically valid
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func (in *Input) Verify() error {
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switch {
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case in == nil:
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return ErrNilInput
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case !utils.IsSortedAndUniqueOrdered(in.SigIndices):
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return ErrInputIndicesNotSortedUnique
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default:
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return nil
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}
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}
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