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signature.go
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signature.go
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// Go Substrate RPC Client (GSRPC) provides APIs and types around Polkadot and any Substrate-based chain RPC calls
//
// Copyright 2019 Centrifuge GmbH
//
// 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 signature
import (
"encoding/hex"
"fmt"
"os"
"os/exec"
"regexp"
"strings"
"golang.org/x/crypto/blake2b"
)
const subkeyCmd = "subkey"
type KeyringPair struct {
// URI is the derivation path for the private key in subkey
URI string
// Address is an SS58 address
Address string
// PublicKey
PublicKey []byte
}
var rePubKey = regexp.MustCompile(`Public key \(hex\): 0x([a-f0-9]*)\n`)
var reAddressOld = regexp.MustCompile(`Address \(SS58\): ([a-zA-Z0-9]*)\n`)
var reAddressNew = regexp.MustCompile(`SS58 Address:\s+([a-zA-Z0-9]*)\n`)
func KeyringPairFromSecret(seedOrPhrase string) (KeyringPair, error) {
// use "subkey" command for creation of public key and address
cmd := exec.Command(subkeyCmd, "inspect", seedOrPhrase)
// execute the command, get the output
out, err := cmd.Output()
if err != nil {
return KeyringPair{}, fmt.Errorf("failed to generate keyring pair from secret: %v", err.Error())
}
if string(out) == "Invalid phrase/URI given" {
return KeyringPair{}, fmt.Errorf("failed to generate keyring pair from secret: invalid phrase/URI given")
}
// find the pub key
resPk := rePubKey.FindStringSubmatch(string(out))
if len(resPk) != 2 {
return KeyringPair{}, fmt.Errorf("failed to generate keyring pair from secret, pubkey not found in output: %v", resPk)
}
pk, err := hex.DecodeString(resPk[1])
if err != nil {
return KeyringPair{}, fmt.Errorf("failed to generate keyring pair from secret, could not hex decode pubkey: %v",
resPk[1])
}
// find the address
addr := reAddressNew.FindStringSubmatch(string(out))
if len(addr) != 2 {
addr = reAddressOld.FindStringSubmatch(string(out))
}
if len(addr) != 2 {
return KeyringPair{}, fmt.Errorf("failed to generate keyring pair from secret, address not found in output: %v", addr)
}
return KeyringPair{
URI: seedOrPhrase,
Address: addr[1],
PublicKey: pk,
}, nil
}
var TestKeyringPairAlice = KeyringPair{
URI: "//Alice",
PublicKey: []byte{0xd4, 0x35, 0x93, 0xc7, 0x15, 0xfd, 0xd3, 0x1c, 0x61, 0x14, 0x1a, 0xbd, 0x4, 0xa9, 0x9f, 0xd6, 0x82, 0x2c, 0x85, 0x58, 0x85, 0x4c, 0xcd, 0xe3, 0x9a, 0x56, 0x84, 0xe7, 0xa5, 0x6d, 0xa2, 0x7d}, //nolint:lll
Address: "5GrwvaEF5zXb26Fz9rcQpDWS57CtERHpNehXCPcNoHGKutQY",
}
// Sign signs data with the private key under the given derivation path, returning the signature. Requires the subkey
// command to be in path
func Sign(data []byte, privateKeyURI string) ([]byte, error) {
// if data is longer than 256 bytes, hash it first
if len(data) > 256 {
h := blake2b.Sum256(data)
data = h[:]
}
// use "subkey" command for signature
cmd := exec.Command(subkeyCmd, "sign", privateKeyURI, "--hex")
// data to stdin
dataHex := hex.EncodeToString(data)
cmd.Stdin = strings.NewReader(dataHex)
// log.Printf("echo -n \"%v\" | %v sign %v --hex", dataHex, subkeyCmd, privateKeyURI)
// execute the command, get the output
out, err := cmd.Output()
if err != nil {
return nil, fmt.Errorf("failed to sign with subkey: %v", err.Error())
}
// remove line feed
if len(out) > 0 && out[len(out)-1] == 10 {
out = out[:len(out)-1]
}
outStr := string(out)
dec, err := hex.DecodeString(outStr)
return dec, err
}
// Verify verifies data using the provided signature and the key under the derivation path. Requires the subkey
// command to be in path
func Verify(data []byte, sig []byte, privateKeyURI string) (bool, error) {
// if data is longer than 256 bytes, hash it first
if len(data) > 256 {
h := blake2b.Sum256(data)
data = h[:]
}
// hexify the sig
sigHex := hex.EncodeToString(sig)
// use "subkey" command for signature
cmd := exec.Command(subkeyCmd, "verify", sigHex, privateKeyURI, "--hex")
// data to stdin
dataHex := hex.EncodeToString(data)
cmd.Stdin = strings.NewReader(dataHex)
// log.Printf("echo -n \"%v\" | %v verify %v %v --hex", dataHex, subkeyCmd, sigHex, privateKeyURI)
// execute the command, get the output
out, err := cmd.Output()
if err != nil {
return false, fmt.Errorf("failed to verify with subkey: %v", err.Error())
}
// remove line feed
if len(out) > 0 && out[len(out)-1] == 10 {
out = out[:len(out)-1]
}
outStr := string(out)
valid := outStr == "Signature verifies correctly."
return valid, nil
}
// LoadKeyringPairFromEnv looks up whether the env variable TEST_PRIV_KEY is set and is not empty and tries to use its
// content as a private phrase, seed or URI to derive a key ring pair. Panics if the private phrase, seed or URI is
// not valid or the keyring pair cannot be derived
func LoadKeyringPairFromEnv() (kp KeyringPair, ok bool) {
priv, ok := os.LookupEnv("TEST_PRIV_KEY")
if !ok || priv == "" {
return kp, false
}
kp, err := KeyringPairFromSecret(priv)
if err != nil {
panic(fmt.Errorf("cannot load keyring pair from env or use fallback: %v", err))
}
return kp, true
}