EndGame v3

sourcecode/gobalance/pkg/onionbalance/tor_ed25519.go

@@ -0,0 +1,22 @@
+package onionbalance
+
+import (
+	"bytes"
+	"crypto/ed25519"
+)
+
+// LoadTorKeyFromDisk load a private identity key from little-t-tor.
+func LoadTorKeyFromDisk(keyBytes []byte) ed25519.PrivateKey {
+	if !bytes.Equal(keyBytes[:29], []byte("== ed25519v1-secret: type0 ==")) {
+		panic("Tor key does not start with Tor header")
+	}
+	expandedSk := keyBytes[32:]
+
+	// The rest should be 64 bytes (a,h):
+	// 32 bytes for secret scalar 'a'
+	// 32 bytes for PRF key 'h'
+	if len(expandedSk) != 64 {
+		panic("Tor private key has the wrong length")
+	}
+	return expandedSk
+}