Rename plugins to external

applications/external/totp/services/hmac/hmac_sha512.h

@@ -0,0 +1,11 @@
+#pragma once
+
+#include <stddef.h>
+
+#define HMAC_SHA512_RESULT_SIZE 64
+
+/* Compute Hashed Message Authentication Code with SHA-512, over BUFFER
+   data of BUFLEN bytes using the KEY of KEYLEN bytes, writing the
+   output to pre-allocated 64 byte minimum RESBUF buffer.  Return 0 on
+   success.  */
+int hmac_sha512(const void* key, size_t keylen, const void* in, size_t inlen, void* restrict resbuf);