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reset.go
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reset.go
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package main
import (
"crypto/rand"
"fmt"
"math/big"
"github.com/cashapp/pivit/cmd/pivit/utils"
"github.com/cashapp/pivit/cmd/pivit/yubikey"
"github.com/go-piv/piv-go/piv"
"github.com/pkg/errors"
)
// commandReset resets the yubikey, sets a new pin, and sets a random PIN unblock key
func commandReset() error {
yk, err := yubikey.Yubikey()
if err != nil {
return err
}
defer func() {
_ = yk.Close()
}()
if err = yk.Reset(); err != nil {
return errors.Wrap(err, "reset PIV applet")
}
newPin, err := utils.GetPin()
if err != nil {
return errors.Wrap(err, "get pin")
}
if err = yk.SetPIN(piv.DefaultPIN, newPin); err != nil {
return errors.Wrap(err, "failed to change pin")
}
newManagementKey := deriveManagementKey(newPin)
if err = yk.SetManagementKey(piv.DefaultManagementKey, *newManagementKey); err != nil {
return errors.Wrap(err, "set new management key")
}
randomPuk, err := rand.Int(rand.Reader, big.NewInt(100_000_000))
if err != nil {
return errors.Wrap(err, "create new random puk")
}
if err = yk.SetPUK(piv.DefaultPUK, fmt.Sprintf("%08d", randomPuk)); err != nil {
return errors.Wrap(err, "set new puk")
}
return nil
}