lib/sodium/SecretBox: wrappers for crypto_secretbox_*()

src/lib/sodium/SecretBox.hxx

@@ -0,0 +1,33 @@
+// SPDX-License-Identifier: BSD-2-Clause
+// Copyright CM4all GmbH
+// author: Max Kellermann <[email protected]>
+
+#pragma once
+
+#include <sodium/crypto_secretbox.h>
+
+static inline void
+crypto_secretbox_easy(std::byte *ciphertext,
+		      std::span<const std::byte> message,
+		      std::span<const std::byte, crypto_secretbox_NONCEBYTES> nonce,
+		      std::span<const std::byte, crypto_secretbox_KEYBYTES> key) noexcept
+{
+	crypto_secretbox_easy(reinterpret_cast<unsigned char *>(ciphertext),
+			      reinterpret_cast<const unsigned char *>(message.data()),
+			      message.size(),
+			      reinterpret_cast<const unsigned char *>(nonce.data()),
+			      reinterpret_cast<const unsigned char *>(key.data()));
+}
+
+static inline bool
+crypto_secretbox_open_easy(std::byte *message,
+			   std::span<const std::byte> ciphertext,
+			   std::span<const std::byte, crypto_secretbox_NONCEBYTES> nonce,
+			   std::span<const std::byte, crypto_secretbox_KEYBYTES> key) noexcept
+{
+	return crypto_secretbox_open_easy(reinterpret_cast<unsigned char *>(message),
+					  reinterpret_cast<const unsigned char *>(ciphertext.data()),
+					  ciphertext.size(),
+					  reinterpret_cast<const unsigned char *>(nonce.data()),
+					  reinterpret_cast<const unsigned char *>(key.data())) == 0;
+}