func (cf *Cifrador) Decrypt(desencriptar []byte) []byte {
res := desencriptar
rckey := cf.rckey[:]
crc4, err := rc4.NewCipher(rckey)
if err != nil {
panic(err)
}
crc4.XORKeyStream(res, res)
salsa20.XORKeyStream(res, res, cf.nonce, &cf.key)
return res
}
func load(r io.Reader, key []byte, password string) (*DB, error) {
l := &loader{r: r, key: key, password: password, db: &DB{}}
err := l.readFixedHeader()
if err != nil {
return nil, err
}
err = l.readDynamicHeader()
if err != nil {
return nil, err
}
err = l.readPayload()
if err != nil {
return nil, err
}
kpf := KeePassFile{}
err = xml.Unmarshal(l.body, &kpf)
if err != nil {
return nil, err
}
l.db.KeePassFile = kpf
err = l.removeProtect(false)
if err != nil {
return nil, err
}
// go's salsa20 library has no way to specify the offset (8-bytes of nonce)
// into the stream so the entire stream needs to be decrypted via a single
// operation.
psk := sha256.Sum256(l.protectedStreamKey[:])
salsa20.XORKeyStream(l.pwStream, l.pwStream, protectedIV, &psk)
err = l.removeProtect(true)
if err != nil {
return nil, err
}
return l.db, nil
}