Prototype with single host server and no admin panel (#2)

Reviewed-on: wrenn/sandbox#2
Co-authored-by: pptx704 <rafeed@omukk.dev>
Co-committed-by: pptx704 <rafeed@omukk.dev>

envd/internal/shared/keys/sha512.go

@@ -0,0 +1,22 @@
+// SPDX-License-Identifier: Apache-2.0
+
+package keys
+
+import (
+	"crypto/sha512"
+	"encoding/hex"
+)
+
+// HashAccessToken computes the SHA-512 hash of an access token.
+func HashAccessToken(token string) string {
+	h := sha512.Sum512([]byte(token))
+
+	return hex.EncodeToString(h[:])
+}
+
+// HashAccessTokenBytes computes the SHA-512 hash of an access token from bytes.
+func HashAccessTokenBytes(token []byte) string {
+	h := sha512.Sum512(token)
+
+	return hex.EncodeToString(h[:])
+}