Add ML-KEM 1024 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 bytestring.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, 128 insertions, 0 deletions

diff --git a/src/regress/lib/libcrypto/mlkem/mlkem1024_decap_tests.c b/src/regress/lib/libcrypto/mlkem/mlkem1024_decap_tests.c
new file mode 100644
index 0000000000..816bc154ab
--- /dev/null
+++ b/src/regress/lib/libcrypto/mlkem/mlkem1024_decap_tests.c
@@ -0,0 +1,128 @@
+/* Copyright (c) 2024, Google Inc.
+ * Copyright (c) 2024, Bob Beck <beck@obtuse.com>
+ *
+ * Permission to use, copy, modify, and/or 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. */
+
+#include <err.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+
+#include <openssl/evp.h>
+
+#include "bytestring.h"
+#include "mlkem.h"
+#include "mlkem_internal.h"
+#include "sha3_internal.h"
+#include "mlkem_tests_util.h"
+
+static void
+MlkemDecapFileTest(CBS *c, CBS *k, CBS *dk, int should_fail)
+{
+        uint8_t shared_secret[MLKEM_SHARED_SECRET_BYTES];
+        struct MLKEM1024_private_key priv;
+        int parse_ok, decap_ok;
+
+        parse_ok = MLKEM1024_parse_private_key(&priv, dk);
+        if (!parse_ok) {
+                TEST(!should_fail, "parse_private_key");
+                return;
+        }
+        decap_ok = MLKEM1024_decap(shared_secret, CBS_data(c), CBS_len(c),
+            &priv);
+        if (!decap_ok) {
+                TEST(!should_fail, "decap");
+                return;
+        }
+        TEST_DATAEQ(shared_secret, CBS_data(k),
+            MLKEM_SHARED_SECRET_BYTES, "shared_secret");
+}
+
+#define S_START 0
+#define S_COMMENT 1
+#define S_PRIVATE_KEY 2
+#define S_CIPHERTEXT 3
+#define S_RESULT 4
+#define S_SHARED_SECRET  5
+
+int
+main(int argc, char **argv)
+{
+        CBS ciphertext, shared_secret, private_key;
+        const uint8_t *p = NULL;
+        int should_fail = 0;
+        char *buf;
+        FILE *fp;
+        int state;
+
+        fprintf(stderr, "Testing decap test vectors in %s\n", argv[1]);
+        TEST((fp = fopen(argv[1], "r")) == NULL, "can't open test file");
+        MALLOC(buf, 16*1024);
+        state = S_COMMENT;
+        test_number = 1;
+        while (fgets(buf, 16*1024, fp) != NULL) {
+                switch (state) {
+                case S_START:
+                        if (strcmp(buf, "\n") != 0)
+                                break;
+                        state = S_COMMENT;
+                        break;
+                case S_COMMENT:
+                        if (strncmp(buf, "#", 1) != 0)
+                                break;
+                        state = S_PRIVATE_KEY;
+                        break;
+                case S_PRIVATE_KEY:
+                        if (strncmp(buf, "private_key: ",
+                            strlen("private_key: ")) != 0)
+                                break;
+                        grab_data(&private_key, buf, strlen("private_key: "));
+                        p = CBS_data(&private_key);
+                        state = S_CIPHERTEXT;
+                        break;
+                case S_CIPHERTEXT:
+                        if (strncmp(buf, "ciphertext: ",
+                            strlen("ciphertext: ")) != 0)
+                                break;
+                        grab_data(&ciphertext, buf, strlen("ciphertext: "));
+                        state = S_RESULT;
+                        break;
+                case S_RESULT:
+                        if (strncmp(buf, "result: pass",
+                            strlen("result: pass")) != 0)
+                                should_fail = 1;
+                        else
+                                should_fail = 0;
+                        state = S_SHARED_SECRET;
+                        break;
+                case S_SHARED_SECRET:
+                        if (strncmp(buf, "shared_secret: ",
+                            strlen("shared_secret: ")) != 0)
+                                break;
+                        grab_data(&shared_secret, buf,
+                            strlen("shared_secret: "));
+                        MlkemDecapFileTest(&ciphertext, &shared_secret,
+                            &private_key, should_fail);
+                        free((void *)CBS_data(&ciphertext));
+                        free((void *)CBS_data(&shared_secret));
+                        free((void *)p);
+
+                        test_number++;
+                        state = S_START;
+                        break;
+                }
+        }
+
+        free(buf);
+        exit(failure);
+}