VMess AEAD Experiment

proxy/vmess/aead/kdf.go

@@ -0,0 +1,26 @@
+package aead
+
+import (
+	"crypto/hmac"
+	"crypto/sha256"
+	"hash"
+)
+
+func KDF(key []byte, path ...string) []byte {
+	hmacf := hmac.New(func() hash.Hash {
+		return sha256.New()
+	}, []byte("VMess AEAD KDF"))
+
+	for _, v := range path {
+		hmacf = hmac.New(func() hash.Hash {
+			return hmacf
+		}, []byte(v))
+	}
+	hmacf.Write(key)
+	return hmacf.Sum(nil)
+}
+
+func KDF16(key []byte, path ...string) []byte {
+	r := KDF(key, path...)
+	return r[:16]
+}