59 lines
1.7 KiB
Go
59 lines
1.7 KiB
Go
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package psbt
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import (
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"bytes"
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"github.com/btcsuite/btcd/btcec"
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)
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// PartialSig encapsulate a (BTC public key, ECDSA signature)
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// pair, note that the fields are stored as byte slices, not
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// btcec.PublicKey or btcec.Signature (because manipulations will
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// be with the former not the latter, here); compliance with consensus
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// serialization is enforced with .checkValid()
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type PartialSig struct {
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PubKey []byte
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Signature []byte
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}
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// PartialSigSorter implements sort.Interface for PartialSig.
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type PartialSigSorter []*PartialSig
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func (s PartialSigSorter) Len() int { return len(s) }
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func (s PartialSigSorter) Swap(i, j int) { s[i], s[j] = s[j], s[i] }
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func (s PartialSigSorter) Less(i, j int) bool {
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return bytes.Compare(s[i].PubKey, s[j].PubKey) < 0
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}
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// validatePubkey checks if pubKey is *any* valid pubKey serialization in a
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// Bitcoin context (compressed/uncomp. OK).
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func validatePubkey(pubKey []byte) bool {
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_, err := btcec.ParsePubKey(pubKey, btcec.S256())
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if err != nil {
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return false
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}
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return true
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}
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// validateSignature checks that the passed byte slice is a valid DER-encoded
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// ECDSA signature, including the sighash flag. It does *not* of course
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// validate the signature against any message or public key.
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func validateSignature(sig []byte) bool {
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_, err := btcec.ParseDERSignature(sig, btcec.S256())
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if err != nil {
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return false
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}
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return true
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}
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// checkValid checks that both the pbukey and sig are valid. See the methods
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// (PartialSig, validatePubkey, validateSignature) for more details.
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//
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// TODO(waxwing): update for Schnorr will be needed here if/when that
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// activates.
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func (ps *PartialSig) checkValid() bool {
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return validatePubkey(ps.PubKey) && validateSignature(ps.Signature)
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}
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