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keysGenerator.go
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/
keysGenerator.go
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package core
import (
"fmt"
"github.com/multiversx/mx-chain-core-go/core/check"
crypto "github.com/multiversx/mx-chain-crypto-go"
"github.com/multiversx/mx-sdk-go/data"
"github.com/multiversx/mx-sdk-go/interactors"
)
const managedKeyIndex = 0
// ArgGuardianKeyGenerator is the DTO used to create a new instance of guardian key generator
type ArgGuardianKeyGenerator struct {
Mnemonic data.Mnemonic
KeyGen crypto.KeyGenerator
}
type guardianKeyGenerator struct {
mnemonic data.Mnemonic
keyGen crypto.KeyGenerator
}
// NewGuardianKeyGenerator returns a new instance of guardian key generator
func NewGuardianKeyGenerator(args ArgGuardianKeyGenerator) (*guardianKeyGenerator, error) {
err := checkArgs(args)
if err != nil {
return nil, err
}
return &guardianKeyGenerator{
mnemonic: args.Mnemonic,
keyGen: args.KeyGen,
}, nil
}
func checkArgs(args ArgGuardianKeyGenerator) error {
if len(args.Mnemonic) == 0 {
return fmt.Errorf("%w for mnemonic", ErrInvalidValue)
}
if check.IfNil(args.KeyGen) {
return ErrNilKeyGenerator
}
return nil
}
// GenerateManagedKey generates one HD key based on a constant index, which will only be used by the service
func (generator *guardianKeyGenerator) GenerateManagedKey() (crypto.PrivateKey, error) {
wallet := interactors.NewWallet()
privateKeyBytes := wallet.GetPrivateKeyFromMnemonic(generator.mnemonic, 0, managedKeyIndex)
return generator.keyGen.PrivateKeyFromByteArray(privateKeyBytes)
}
// GenerateKeys generates two HD keys based on the provided index and the managed keys
func (generator *guardianKeyGenerator) GenerateKeys(index uint32) ([]crypto.PrivateKey, error) {
if index == managedKeyIndex {
return nil, fmt.Errorf("%w for index %d", ErrInvalidValue, index)
}
wallet := interactors.NewWallet()
firstIndex := index
firstPrivateKeyBytes := wallet.GetPrivateKeyFromMnemonic(generator.mnemonic, 0, firstIndex)
firstKey, err := generator.keyGen.PrivateKeyFromByteArray(firstPrivateKeyBytes)
if err != nil {
return nil, err
}
secondIndex := firstIndex + 1
secondPrivateKeyBytes := wallet.GetPrivateKeyFromMnemonic(generator.mnemonic, 0, secondIndex)
secondKey, err := generator.keyGen.PrivateKeyFromByteArray(secondPrivateKeyBytes)
if err != nil {
return nil, err
}
return []crypto.PrivateKey{firstKey, secondKey}, nil
}
// IsInterfaceNil returns true if there is no value under the interface
func (generator *guardianKeyGenerator) IsInterfaceNil() bool {
return generator == nil
}