1 files changed, 0 insertions, 85 deletions
diff --git a/pkg/instance/experimental.go b/pkg/instance/experimental.go
deleted file mode 100644
index 24feeaf..0000000
--- a/pkg/instance/experimental.go
+++ /dev/null
@@ -1,85 +0,0 @@
-package instance
-
-import (
-	"bytes"
-	"context"
-	"crypto"
-	"crypto/ed25519"
-	"crypto/sha256"
-	"encoding/base64"
-	"encoding/binary"
-	"fmt"
-	"net/http"
-
-	"git.sigsum.org/sigsum-go/pkg/log"
-	"git.sigsum.org/sigsum-go/pkg/types"
-)
-
-// algEd25519 identifies a checkpoint signature algorithm
-const algEd25519 byte = 1
-
-// getCheckpoint is an experimental endpoint that is not part of the official
-// Sigsum API.  Documentation can be found in the transparency-dev repo.
-func getCheckpoint(ctx context.Context, i *Instance, w http.ResponseWriter, r *http.Request) (int, error) {
-	log.Debug("handling get-checkpoint request")
-	sth, err := i.Stateman.ToCosignTreeHead(ctx)
-	if err != nil {
-		return http.StatusInternalServerError, err
-	}
-	if err := i.signWriteNote(w, sth); err != nil {
-		return http.StatusInternalServerError, err
-	}
-	return http.StatusOK, nil
-}
-
-// signWriteNote signs and writes a checkpoint which uses "sigsum.org:<prefix>"
-// as origin string.  Origin string is also used as ID in the note signature.
-// This means that a sigsum log's prefix (say, "glass-frog"), must be unique.
-func (i *Instance) signWriteNote(w http.ResponseWriter, sth *types.SignedTreeHead) error {
-	origin := fmt.Sprintf("sigsum.org:%s", i.Prefix)
-	msg := fmt.Sprintf("%s\n%d\n%s\n",
-		origin,
-		sth.TreeSize,
-		base64.StdEncoding.EncodeToString(sth.RootHash[:]),
-	)
-	sig, err := noteSign(i.Signer, origin, msg)
-	if err != nil {
-		return err
-	}
-
-	fmt.Fprintf(w, "%s\n\u2014 %s %s\n", msg, origin, sig)
-	return nil
-}
-
-// noteSign returns a note signature for the provided origin and message
-func noteSign(signer crypto.Signer, origin, msg string) (string, error) {
-	sig, err := signer.Sign(nil, []byte(msg), crypto.Hash(0))
-	if err != nil {
-		return "", err
-	}
-
-	var hbuf [4]byte
-	binary.BigEndian.PutUint32(hbuf[:], noteKeyHash(origin, notePubKeyEd25519(signer)))
-	sig = append(hbuf[:], sig...)
-	return base64.StdEncoding.EncodeToString(sig), nil
-}
-
-// See:
-// https://cs.opensource.google/go/x/mod/+/refs/tags/v0.5.1:sumdb/note/note.go;l=336
-func notePubKeyEd25519(signer crypto.Signer) []byte {
-	return bytes.Join([][]byte{
-		[]byte{algEd25519},
-		signer.Public().(ed25519.PublicKey),
-	}, nil)
-}
-
-// Source:
-// https://cs.opensource.google/go/x/mod/+/refs/tags/v0.5.1:sumdb/note/note.go;l=222
-func noteKeyHash(name string, key []byte) uint32 {
-	h := sha256.New()
-	h.Write([]byte(name))
-	h.Write([]byte("\n"))
-	h.Write(key)
-	sum := h.Sum(nil)
-	return binary.BigEndian.Uint32(sum)
-}