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txscript: Remove unused calcWitnessSignatureHash

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Conner Fromknecht 2019-04-19 19:48:25 -07:00 committed by Roy Lee
parent 08a53b25fb
commit 82e02951dc
1 changed files with 0 additions and 24 deletions
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24
txscript/script.go
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@ -534,30 +534,6 @@ func calcWitnessSignatureHashRaw(scriptSig []byte, sigHashes *TxSigHashes,
return chainhash.DoubleHashB(sigHash.Bytes()), nil return chainhash.DoubleHashB(sigHash.Bytes()), nil
} }
// calcWitnessSignatureHash computes the sighash digest of a transaction's
// segwit input using the new, optimized digest calculation algorithm defined
// in BIP0143: https://github.com/bitcoin/bips/blob/master/bip-0143.mediawiki.
// This function makes use of pre-calculated sighash fragments stored within
// the passed HashCache to eliminate duplicate hashing computations when
// calculating the final digest, reducing the complexity from O(N^2) to O(N).
// Additionally, signatures now cover the input value of the referenced unspent
// output. This allows offline, or hardware wallets to compute the exact amount
// being spent, in addition to the final transaction fee. In the case the
// wallet if fed an invalid input amount, the real sighash will differ causing
// the produced signature to be invalid.
//
// DEPRECATED: Use calcWitnessSignatureHashRaw instead.
func calcWitnessSignatureHash(subScript []parsedOpcode, sigHashes *TxSigHashes,
hashType SigHashType, tx *wire.MsgTx, idx int, amt int64) ([]byte, error) {
script, err := unparseScript(subScript)
if err != nil {
return nil, err
}
return calcWitnessSignatureHashRaw(script, sigHashes, hashType, tx, idx, amt)
}
// CalcWitnessSigHash computes the sighash digest for the specified input of // CalcWitnessSigHash computes the sighash digest for the specified input of
// the target transaction observing the desired sig hash type. // the target transaction observing the desired sig hash type.
func CalcWitnessSigHash(script []byte, sigHashes *TxSigHashes, hType SigHashType, func CalcWitnessSigHash(script []byte, sigHashes *TxSigHashes, hType SigHashType,