1 files changed, 115 insertions, 0 deletions
diff --git a/firmware/2lib/2secdata.c b/firmware/2lib/2secdata.c
new file mode 100644
index 00000000..668bc507
--- /dev/null
+++ b/firmware/2lib/2secdata.c
@@ -0,0 +1,115 @@
+/* Copyright (c) 2014 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.
+ *
+ * Secure storage APIs
+ */
+
+#include "2sysincludes.h"
+#include "2common.h"
+#include "2crc8.h"
+#include "2misc.h"
+#include "2secdata.h"
+
+int vb2_secdata_check_crc(const struct vb2_context *ctx)
+{
+	const struct vb2_secdata *sec =
+		(const struct vb2_secdata *)ctx->secdata;
+
+	/* Verify CRC */
+	if (sec->crc8 != vb2_crc8(sec, offsetof(struct vb2_secdata, crc8)))
+		return VB2_ERROR_BAD_SECDATA;
+
+	return VB2_SUCCESS;
+}
+
+int vb2_secdata_create(struct vb2_context *ctx)
+{
+	struct vb2_secdata *sec = (struct vb2_secdata *)ctx->secdata;
+
+	/* Clear the entire struct */
+	memset(sec, 0, sizeof(*sec));
+
+	/* Set to current version */
+	sec->struct_version = VB2_SECDATA_VERSION;
+
+	/* Calculate initial CRC */
+	sec->crc8 = vb2_crc8(sec, offsetof(struct vb2_secdata, crc8));
+	ctx->flags |= VB2_CONTEXT_SECDATA_CHANGED;
+	return VB2_SUCCESS;
+}
+
+int vb2_secdata_init(struct vb2_context *ctx)
+{
+	struct vb2_shared_data *sd = vb2_get_sd(ctx);
+	struct vb2_secdata *sec = (struct vb2_secdata *)ctx->secdata;
+	int rv;
+
+	/* Data must be new enough to have a CRC */
+	if (sec->struct_version < 2)
+		return VB2_ERROR_BAD_SECDATA;
+
+	rv = vb2_secdata_check_crc(ctx);
+	if (rv)
+		return rv;
+
+	/* Set status flag */
+	sd->status |= VB2_SD_STATUS_SECDATA_INIT;
+	// TODO: unit test for that
+
+	return VB2_SUCCESS;
+}
+
+int vb2_secdata_get(struct vb2_context *ctx,
+		    enum vb2_secdata_param param,
+		    uint32_t *dest)
+{
+	struct vb2_secdata *sec = (struct vb2_secdata *)ctx->secdata;
+
+	switch(param) {
+	case VB2_SECDATA_FLAGS:
+		*dest = sec->flags;
+		return VB2_SUCCESS;
+
+	case VB2_SECDATA_VERSIONS:
+		*dest = sec->fw_versions;
+		return VB2_SUCCESS;
+
+	default:
+		return VB2_ERROR_UNKNOWN;
+	}
+}
+
+int vb2_secdata_set(struct vb2_context *ctx,
+		    enum vb2_secdata_param param,
+		    uint32_t value)
+{
+	struct vb2_secdata *sec = (struct vb2_secdata *)ctx->secdata;
+	uint32_t now;
+
+	/* If not changing the value, don't regenerate the CRC. */
+	if (vb2_secdata_get(ctx, param, &now) == VB2_SUCCESS && now == value)
+		return VB2_SUCCESS;
+
+	switch(param) {
+	case VB2_SECDATA_FLAGS:
+		/* Make sure flags is in valid range */
+		if (value > 0xff)
+			return VB2_ERROR_UNKNOWN;
+
+		sec->flags = value;
+		break;
+
+	case VB2_SECDATA_VERSIONS:
+		sec->fw_versions = value;
+		break;
+
+	default:
+		return VB2_ERROR_UNKNOWN;
+	}
+
+	/* Regenerate CRC */
+	sec->crc8 = vb2_crc8(sec, offsetof(struct vb2_secdata, crc8));
+	ctx->flags |= VB2_CONTEXT_SECDATA_CHANGED;
+	return VB2_SUCCESS;
+}