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package proton
import (
"encoding/base64"
"fmt"
"github.com/ProtonMail/go-srp"
"github.com/bradenaw/juniper/xslices"
)
type Salt struct {
ID, KeySalt string
}
type Salts []Salt
func (salts Salts) SaltForKey(keyPass []byte, keyID string) ([]byte, error) {
idx := xslices.IndexFunc(salts, func(salt Salt) bool {
return salt.ID == keyID
})
if idx < 0 {
return nil, fmt.Errorf("no salt found for key %s", keyID)
}
keySalt, err := base64.StdEncoding.DecodeString(salts[idx].KeySalt)
if err != nil {
return nil, err
}
saltedKeyPass, err := srp.MailboxPassword(keyPass, keySalt)
if err != nil {
return nil, nil
}
return saltedKeyPass[len(saltedKeyPass)-31:], nil
}
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