func (this *State) ExchangeRateAuthorityIsValid(e interfaces.IEBEntry) bool {
// convert the conf quthority address into a
authorityAddress := base58.Decode(this.ExchangeRateAuthorityAddress)
ecPubPrefix := []byte{0x59, 0x2a}
if !bytes.Equal(authorityAddress[:2], ecPubPrefix) {
fmt.Errorf("Invalid Entry Credit Private Address")
return false
}
pub := new([32]byte)
copy(pub[:], authorityAddress[2:34])
// in case verify can't handle empty public key
if this.ExchangeRateAuthorityAddress == "" {
return false
}
sig := new([64]byte)
externalIds := e.ExternalIDs()
// check for number of ext ids
if len(externalIds) < 1 {
return false
}
copy(sig[:], externalIds[0]) // First ext id needs to be the signature of the content
if !ed.VerifyCanonical(pub, e.GetContent(), sig) {
return false
}
return true
}
