Golang Address.DSA方法代码示例

// PayToSSRtx creates a new script to pay a transaction output to a
// public key hash, but tags the output with OP_SSRTX. For use in constructing
// valid SSRtx.
func PayToSSRtx(addr dcrutil.Address) ([]byte, error) {
	if addr == nil {
		return nil, ErrUnsupportedAddress
	}

	// Only pay to pubkey hash and pay to script hash are
	// supported.
	scriptType := PubKeyHashTy
	switch addr := addr.(type) {
	case *dcrutil.AddressPubKeyHash:
		if addr.DSA(addr.Net()) != chainec.ECTypeSecp256k1 {
			return nil, ErrUnsupportedAddress
		}
		break
	case *dcrutil.AddressScriptHash:
		scriptType = ScriptHashTy
		break
	default:
		return nil, ErrUnsupportedAddress
	}

	hash := addr.ScriptAddress()

	if scriptType == PubKeyHashTy {
		return NewScriptBuilder().AddOp(OP_SSRTX).AddOp(OP_DUP).
			AddOp(OP_HASH160).AddData(hash).AddOp(OP_EQUALVERIFY).
			AddOp(OP_CHECKSIG).Script()
	}
	return NewScriptBuilder().AddOp(OP_SSRTX).AddOp(OP_HASH160).
		AddData(hash).AddOp(OP_EQUAL).Script()
}

// GenerateSStxAddrPush generates an OP_RETURN push for SSGen payment addresses in
// an SStx.
func GenerateSStxAddrPush(addr dcrutil.Address, amount dcrutil.Amount,
	limits uint16) ([]byte, error) {
	if addr == nil {
		return nil, ErrUnsupportedAddress
	}

	// Only pay to pubkey hash and pay to script hash are
	// supported.
	scriptType := PubKeyHashTy
	switch addr := addr.(type) {
	case *dcrutil.AddressPubKeyHash:
		if addr.DSA(addr.Net()) != chainec.ECTypeSecp256k1 {
			return nil, ErrUnsupportedAddress
		}
		break
	case *dcrutil.AddressScriptHash:
		scriptType = ScriptHashTy
		break
	default:
		return nil, ErrUnsupportedAddress
	}

	// Prefix
	dataPushes := []byte{
		0x6a, // OP_RETURN
		0x1e, // OP_DATA_30
	}

	hash := addr.ScriptAddress()

	amountBuffer := make([]byte, 8)
	binary.LittleEndian.PutUint64(amountBuffer, uint64(amount))

	// Set the bit flag indicating pay to script hash.
	if scriptType == ScriptHashTy {
		amountBuffer[7] |= 1 << 7
	}

	limitsBuffer := make([]byte, 2)
	binary.LittleEndian.PutUint16(limitsBuffer, limits)

	// Concatenate the prefix, pubkeyhash, and amount.
	addrOut := append(dataPushes, hash...)
	addrOut = append(addrOut, amountBuffer...)
	addrOut = append(addrOut, limitsBuffer...)

	return addrOut, nil
}

// addrToKey converts known address types to an addrindex key.  An error is
// returned for unsupported types.
func addrToKey(addr dcrutil.Address, params *chaincfg.Params) ([addrKeySize]byte, error) {
	switch addr := addr.(type) {
	case *dcrutil.AddressPubKeyHash:
		switch addr.DSA(params) {
		case chainec.ECTypeSecp256k1:
			var result [addrKeySize]byte
			result[0] = addrKeyTypePubKeyHash
			copy(result[1:], addr.Hash160()[:])
			return result, nil
		case chainec.ECTypeEdwards:
			var result [addrKeySize]byte
			result[0] = addrKeyTypePubKeyHashEdwards
			copy(result[1:], addr.Hash160()[:])
			return result, nil
		case chainec.ECTypeSecSchnorr:
			var result [addrKeySize]byte
			result[0] = addrKeyTypePubKeyHashSchnorr
			copy(result[1:], addr.Hash160()[:])
			return result, nil
		}

	case *dcrutil.AddressScriptHash:
		var result [addrKeySize]byte
		result[0] = addrKeyTypeScriptHash
		copy(result[1:], addr.Hash160()[:])
		return result, nil

	case *dcrutil.AddressSecpPubKey:
		var result [addrKeySize]byte
		result[0] = addrKeyTypePubKeyHash
		copy(result[1:], addr.AddressPubKeyHash().Hash160()[:])
		return result, nil

	case *dcrutil.AddressEdwardsPubKey:
		var result [addrKeySize]byte
		result[0] = addrKeyTypePubKeyHashEdwards
		copy(result[1:], addr.AddressPubKeyHash().Hash160()[:])
		return result, nil

	case *dcrutil.AddressSecSchnorrPubKey:
		var result [addrKeySize]byte
		result[0] = addrKeyTypePubKeyHashSchnorr
		copy(result[1:], addr.AddressPubKeyHash().Hash160()[:])
		return result, nil
	}

	return [addrKeySize]byte{}, errUnsupportedAddressType
}

// PayToAddrScript creates a new script to pay a transaction output to a the
// specified address.
func PayToAddrScript(addr dcrutil.Address) ([]byte, error) {
	switch addr := addr.(type) {
	case *dcrutil.AddressPubKeyHash:
		if addr == nil {
			return nil, ErrUnsupportedAddress
		}
		switch addr.DSA(addr.Net()) {
		case chainec.ECTypeSecp256k1:
			return payToPubKeyHashScript(addr.ScriptAddress())
		case chainec.ECTypeEdwards:
			return payToPubKeyHashEdwardsScript(addr.ScriptAddress())
		case chainec.ECTypeSecSchnorr:
			return payToPubKeyHashSchnorrScript(addr.ScriptAddress())
		}

	case *dcrutil.AddressScriptHash:
		if addr == nil {
			return nil, ErrUnsupportedAddress
		}
		return payToScriptHashScript(addr.ScriptAddress())

	case *dcrutil.AddressSecpPubKey:
		if addr == nil {
			return nil, ErrUnsupportedAddress
		}
		return payToPubKeyScript(addr.ScriptAddress())

	case *dcrutil.AddressEdwardsPubKey:
		if addr == nil {
			return nil, ErrUnsupportedAddress
		}
		return payToEdwardsPubKeyScript(addr.ScriptAddress())

	case *dcrutil.AddressSecSchnorrPubKey:
		if addr == nil {
			return nil, ErrUnsupportedAddress
		}
		return payToSchnorrPubKeyScript(addr.ScriptAddress())
	}

	return nil, ErrUnsupportedAddress
}