func _UncompressPubkey(pubkey []byte) []byte {
if _VerifyPubkey(pubkey) != 1 {
log.Panic("cannot uncompress invalid pubkey")
return nil
}
var pub_xy secp.XY
err := pub_xy.ParsePubkey(pubkey)
if err == false {
log.Panic("ERROR: impossible, pubkey parse fail")
}
var pubkey2 []byte = pub_xy.BytesUncompressed() //uncompressed
if pubkey2 == nil {
log.Panic("ERROR: pubkey, uncompression fail")
return nil
}
return pubkey2
}
//Rename ChkPubkeyValidity
// returns 1 on success
func _VerifyPubkey(pubkey []byte) int {
if len(pubkey) != 33 {
//log.Printf("Seck256k1, VerifyPubkey, pubkey length invalid")
return -1
}
if secp.PubkeyIsValid(pubkey) != 1 {
return -3 //tests parse and validity
}
var pubkey1 secp.XY
ret := pubkey1.ParsePubkey(pubkey)
if ret == false {
return -2 //invalid, parse fail
}
//fails for unknown reason
//if pubkey1.IsValid() == false {
// return -4 //invalid, validation fail
//}
return 1 //valid
}