/
main.go
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/
main.go
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/*
* Flow Go SDK
*
* Copyright 2019 Dapper Labs, Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package main
import (
"context"
"encoding/hex"
"fmt"
"github.com/onflow/flow-go-sdk/access/http"
"github.com/onflow/cadence"
"github.com/onflow/flow-go-sdk"
"github.com/onflow/flow-go-sdk/crypto"
"github.com/onflow/flow-go-sdk/examples"
)
func main() {
UserSignatureValidateAny()
}
var script = []byte(`
import Crypto
pub fun main(
address: Address,
signature: String,
message: String
): Bool {
let keyList = Crypto.KeyList()
let account = getAccount(address)
let keys = account.keys
let signatureBytes = signature.decodeHex()
let messageBytes = message.utf8
var i = 0
while true {
if let key = keys.get(keyIndex: i) {
if key.isRevoked {
// do not check revoked keys
i = i + 1
continue
}
let pk = PublicKey(
publicKey: key.publicKey.publicKey,
signatureAlgorithm: key.publicKey.signatureAlgorithm
)
if pk.verify(
signature: signatureBytes,
signedData: messageBytes,
domainSeparationTag: "FLOW-V0.0-user",
hashAlgorithm: key.hashAlgorithm
) {
// this key is good
return true
}
} else {
// checked all the keys, none of them match
return false
}
i = i + 1
}
return false
}
`)
func UserSignatureValidateAny() {
ctx := context.Background()
flowClient, err := http.NewClient(http.EmulatorHost)
examples.Handle(err)
privateKeyAlice := examples.RandomPrivateKey()
accountKeyAlice := flow.NewAccountKey().
FromPrivateKey(privateKeyAlice).
SetHashAlgo(crypto.SHA3_256).
SetWeight(flow.AccountKeyWeightThreshold / 2)
privateKeyBob := examples.RandomPrivateKey()
accountKeyBob := flow.NewAccountKey().
FromPrivateKey(privateKeyBob).
SetHashAlgo(crypto.SHA3_256).
SetWeight(flow.AccountKeyWeightThreshold / 2)
// create the account with two keys
account := examples.CreateAccount(flowClient, []*flow.AccountKey{accountKeyAlice, accountKeyBob})
// create the message that will be signed with one key
message := []byte("ananas")
signerAlice, err := crypto.NewInMemorySigner(privateKeyAlice, crypto.SHA3_256)
examples.Handle(err)
// sign the message only with Alice
signatureAlice, err := flow.SignUserMessage(signerAlice, message)
examples.Handle(err)
// call the script to verify the signature on chain
value, err := flowClient.ExecuteScriptAtLatestBlock(
ctx,
script,
[]cadence.Value{
cadence.BytesToAddress(account.Address.Bytes()),
cadence.String(hex.EncodeToString(signatureAlice)),
cadence.String(message),
},
)
examples.Handle(err)
// the signature should be valid
if value == cadence.NewBool(true) {
fmt.Println("Signature verification succeeded")
} else {
fmt.Println("Signature verification failed")
}
}