Add ML-KEM 768 from BoringSSL

Changes include conversion from C++, basic KNF, then adaptation to
use our sha3 functions for sha3 and shake instead of the BorinSSL
version. This Adds units tests to run against BoringSSL and NIST test
vectors.

The future public API is the same as Boring's - but is not yet exposed
pending making bytesring.h public (which will happen separately) and
a minor bump

Currently this will just ensure we build and run regress.

ok tb@ to get it into the tree and massage from there.

1 files changed, 40 insertions, 0 deletions

diff --git a/src/lib/libcrypto/hidden/openssl/mlkem.h b/src/lib/libcrypto/hidden/openssl/mlkem.h
new file mode 100644
index 0000000000..01ac28cffd
--- /dev/null
+++ b/src/lib/libcrypto/hidden/openssl/mlkem.h
@@ -0,0 +1,40 @@
+/* $OpenBSD: mlkem.h,v 1.1 2024/12/13 00:03:57 beck Exp $ */
+/*
+ * Copyright (c) 2024 Bob Beck <beck@obtuse.com>
+ *
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+#ifndef _LIBCRYPTO_MLKEM_H
+#define _LIBCRYPTO_MLKEM_H
+
+#ifndef _MSC_VER
+#include_next <openssl/mlkem.h>
+#else
+#include "../include/openssl/mlkem.h"
+#endif
+#include "crypto_namespace.h"
+
+/* Undo when making public */
+#ifdef LIBRESSL_HAS_MLKEM
+LCRYPTO_USED(MLKEM768_generate_key);
+LCRYPTO_USED(MLKEM768_public_from_private);
+LCRYPTO_USED(MLKEM768_encap);
+LCRYPTO_USED(MLKEM768_decap);
+LCRYPTO_USED(MLKEM768_marshal_public_key);
+LCRYPTO_USED(MLKEM768_parse_public_key);
+LCRYPTO_USED(MLKEM768_private_key_from_seed);
+LCRYPTO_USED(MLKEM768_parse_private_key);
+#endif
+
+#endif /* _LIBCRYPTO_MLKEM_H */