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validation.go
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validation.go
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package signature
import (
"fmt"
"github.com/nknorg/nkn/v2/common"
"github.com/nknorg/nkn/v2/crypto"
"github.com/nknorg/nkn/v2/program"
)
func VerifySignableData(signableData SignableData) error {
hashes, err := signableData.GetProgramHashes()
if err != nil {
return err
}
programs := signableData.GetPrograms()
if len(hashes) != len(programs) {
return fmt.Errorf("the number of data hashes %d is different with number of programs %d", len(hashes), len(programs))
}
for i := 0; i < len(programs); i++ {
temp, _ := common.ToCodeHash(programs[i].Code)
if hashes[i] != temp {
return fmt.Errorf("the data hashes %v is different with corresponding program code %v", hashes[i], temp)
}
pk, err := program.GetPublicKeyFromCode(programs[i].Code)
if err != nil {
return err
}
err = crypto.CheckPublicKey(pk)
if err != nil {
return err
}
signature, err := program.GetSignatureFromParameter(programs[i].Parameter)
if err != nil {
return err
}
_, err = VerifySignature(signableData, pk, signature)
if err != nil {
return err
}
}
return nil
}
func VerifySignature(signableData SignableData, pubKey, signature []byte) (bool, error) {
err := crypto.Verify(pubKey, GetHashForSigning(signableData), signature)
if err != nil {
return false, fmt.Errorf("verify signature error: %v", err)
} else {
return true, nil
}
}