56 lines
1.4 KiB
Go
56 lines
1.4 KiB
Go
package lnurl
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import (
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"encoding/hex"
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"errors"
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"net/url"
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"github.com/btcsuite/btcd/btcec"
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)
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type LNURLAuthParams struct {
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Tag string
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K1 string
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Callback string
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Host string
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}
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func (_ LNURLAuthParams) LNURLKind() string { return "lnurl-auth" }
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// VerifySignature takes the hex-encoded parameters passed to an lnurl-login endpoint and verifies
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// the signature against the key and challenge.
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func VerifySignature(k1, sig, key string) (ok bool, err error) {
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bk1, err1 := hex.DecodeString(k1)
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bsig, err2 := hex.DecodeString(sig)
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bkey, err3 := hex.DecodeString(key)
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if err1 != nil || err2 != nil || err3 != nil {
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return false, errors.New("Failed to decode hex.")
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}
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pubkey, err := btcec.ParsePubKey(bkey, btcec.S256())
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if err != nil {
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return false, errors.New("Failed to parse pubkey: " + err.Error())
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}
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signature, err := btcec.ParseDERSignature(bsig, btcec.S256())
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if err != nil {
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return false, errors.New("Failed to parse signature: " + err.Error())
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}
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return signature.Verify(bk1, pubkey), nil
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}
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func HandleAuth(rawurl string, parsed *url.URL, query url.Values) (LNURLParams, error) {
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k1 := query.Get("k1")
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if _, err := hex.DecodeString(k1); err != nil || len(k1) != 64 {
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return nil, errors.New("k1 is not a valid 32-byte hex-encoded string.")
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}
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return LNURLAuthParams{
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Tag: "login",
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K1: k1,
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Callback: rawurl,
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Host: parsed.Host,
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}, nil
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}
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