1 files changed, 74 insertions, 0 deletions
diff --git a/host/lib/host_common2.c b/host/lib/host_common2.c
new file mode 100644
index 00000000..ae02b8ba
--- /dev/null
+++ b/host/lib/host_common2.c
@@ -0,0 +1,74 @@
+/* Copyright (c) 2013 The Chromium OS Authors. All rights reserved.
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ *
+ * Host functions for verified boot.
+ *
+ * TODO: change all 'return 0', 'return 1' into meaningful return codes.
+ */
+
+#include <string.h>
+
+#include "2sysincludes.h"
+#include "2common.h"
+#include "2rsa.h"
+#include "host_common.h"
+#include "host_key2.h"
+#include "cryptolib.h"
+#include "utility.h"
+#include "vb2_common.h"
+#include "vboot_common.h"
+
+struct vb2_fw_preamble *vb2_create_fw_preamble(
+	uint32_t firmware_version,
+	const struct vb2_packed_key *kernel_subkey,
+	const struct vb2_signature *body_signature,
+	const struct vb2_private_key *signing_key,
+	uint32_t flags)
+{
+	uint32_t signed_size = (sizeof(struct vb2_fw_preamble) +
+				kernel_subkey->key_size +
+				body_signature->sig_size);
+	uint32_t block_size = signed_size +
+		vb2_rsa_sig_size(signing_key->sig_alg);
+
+	/* Allocate preamble */
+	struct vb2_fw_preamble *h =
+		(struct vb2_fw_preamble *)calloc(block_size, 1);
+	if (!h)
+		return NULL;
+
+	uint8_t *kernel_subkey_dest = (uint8_t *)(h + 1);
+	uint8_t *body_sig_dest = kernel_subkey_dest + kernel_subkey->key_size;
+	uint8_t *block_sig_dest = body_sig_dest + body_signature->sig_size;
+
+	h->header_version_major = FIRMWARE_PREAMBLE_HEADER_VERSION_MAJOR;
+	h->header_version_minor = FIRMWARE_PREAMBLE_HEADER_VERSION_MINOR;
+	h->preamble_size = block_size;
+	h->firmware_version = firmware_version;
+	h->flags = flags;
+
+	/* Copy data key */
+	PublicKeyInit((VbPublicKey *)&h->kernel_subkey, kernel_subkey_dest,
+		      kernel_subkey->key_size);
+	PublicKeyCopy((VbPublicKey *)&h->kernel_subkey,
+		      (VbPublicKey *)kernel_subkey);
+
+	/* Copy body signature */
+	vb2_init_signature(&h->body_signature,
+			   body_sig_dest, body_signature->sig_size, 0);
+	vb2_copy_signature(&h->body_signature, body_signature);
+
+	/* Set up signature struct so we can calculate the signature */
+	vb2_init_signature(&h->preamble_signature, block_sig_dest,
+			   vb2_rsa_sig_size(signing_key->sig_alg), signed_size);
+
+	/* Calculate signature */
+	struct vb2_signature *sig =
+		vb2_calculate_signature((uint8_t *)h, signed_size, signing_key);
+	vb2_copy_signature(&h->preamble_signature, sig);
+	free(sig);
+
+	/* Return the header */
+	return h;
+}