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signature.go
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signature.go
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package envelope
import (
"crypto/ed25519"
"crypto/rand"
"crypto/sha256"
"strconv"
"strings"
"time"
"github.com/btcsuite/btcutil/base58"
)
func CreateKeys() (ed25519.PublicKey, ed25519.PrivateKey, error) {
publicKey, privateKey, err := ed25519.GenerateKey(rand.Reader)
if err != nil {
return nil, nil, err
}
return publicKey, privateKey, nil
}
func CreateNonce() string {
return strconv.Itoa(int(time.Now().Unix()))
}
func Hash(payload []byte, nonce, channel, chaincode, method, deadline string, pubkey []byte) [32]byte {
bb := append(removeSpacesBetweenCommaAndQuotes(payload), nonce...) // resolve the unclear json serialization behavior in protojson package
bb = append(bb, channel...)
bb = append(bb, chaincode...)
bb = append(bb, method...)
bb = append(bb, deadline...)
b58Pubkey := base58.Encode(pubkey)
bb = append(bb, b58Pubkey...)
return sha256.Sum256(bb)
}
func CreateSig(payload []byte, nonce, channel, chaincode, method, deadline string, privateKey []byte) ([]byte, []byte) {
pubKey := ed25519.PrivateKey(privateKey).Public()
hashed := Hash(payload, nonce, channel, chaincode, method, deadline, []byte(pubKey.(ed25519.PublicKey)))
sig := ed25519.Sign(privateKey, hashed[:])
return pubKey.(ed25519.PublicKey), sig
}
func CheckSig(payload []byte, nonce, channel, chaincode, method, deadline string, pubKey []byte, sig []byte) error {
hashed := Hash(payload, nonce, channel, chaincode, method, deadline, pubKey)
if !ed25519.Verify(pubKey, hashed[:], sig) {
return ErrCheckSignatureFailed
}
return nil
}
func removeSpacesBetweenCommaAndQuotes(s []byte) []byte {
removed := strings.ReplaceAll(string(s), `", "`, `","`)
removed = strings.ReplaceAll(removed, `"}, {"`, `"},{"`)
return []byte(strings.ReplaceAll(removed, `], "`, `],"`))
}