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txscript: add exported sighash calc func

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This commit is contained in:
Olaoluwa Osuntokun 2017-01-04 16:28:38 -08:00
parent 7647f884a9
commit 4a6dc67067
1 changed files with 13 additions and 0 deletions
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13
txscript/script.go
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@ -424,6 +424,19 @@ func calcHashOutputs(tx *wire.MsgTx) chainhash.Hash {
return chainhash.DoubleHashH(b.Bytes()) return chainhash.DoubleHashH(b.Bytes())
} }
// CalcWitnessSigHash exports calcWitnessSignatureHash so that signatures
// can be verified.
func CalcWitnessSigHash(subScript []byte, sigHashes *TxSigHashes,
hashType SigHashType, tx *wire.MsgTx, idx int, amt int64) ([]byte, error) {
parsedScript, err := parseScript(subScript)
if err != nil {
return nil, fmt.Errorf("cannot parse output script: %v", err)
}
sighash := calcWitnessSignatureHash(
parsedScript, sigHashes, hashType, tx, idx, amt)
return sighash, nil
}
// calcWitnessSignatureHash computes the sighash digest of a transaction's // calcWitnessSignatureHash computes the sighash digest of a transaction's
// segwit input using the new, optimized digest calculation algorithm defined // segwit input using the new, optimized digest calculation algorithm defined
// in BIP0143: https://github.com/bitcoin/bips/blob/master/bip-0143.mediawiki. // in BIP0143: https://github.com/bitcoin/bips/blob/master/bip-0143.mediawiki.