1 files changed, 91 insertions, 0 deletions
diff --git a/core/arch/arm/plat-vexpress/vendor_props.c b/core/arch/arm/plat-vexpress/vendor_props.c
new file mode 100644
index 0000000..2f4d10d
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+++ b/core/arch/arm/plat-vexpress/vendor_props.c
@@ -0,0 +1,91 @@
+/*
+ * Copyright (c) 2016, Linaro Limited.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ * this list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ * this list of conditions and the following disclaimer in the documentation
+ * and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+#include <tee/tee_svc.h>
+#include <user_ta_header.h>
+#include <util.h>
+#include <kernel/tee_ta_manager.h>
+#include <kernel/tee_common_otp.h>
+#include <tee/tee_cryp_utl.h>
+
+/*
+ * The data to hash is 48 bytes made up of:
+ * - 16 bytes: the UUID of the calling TA.
+ * - 32 bytes: the hardware device ID
+ * The resulting endorsement seed is 32 bytes.
+ *
+ * The output buffer is the "binary" struct defined in
+ * the "prop_value" union and therefore comprises:
+ * -  4 bytes: the size of the binary value data (32)
+ * - 32 bytes: the binary value data (endorsement seed)
+ *
+ * Note that this code assumes an endorsement seed
+ * size == device ID size for convenience.
+ */
+static TEE_Result get_prop_endorsement(struct tee_ta_session *sess,
+				       void *buf, size_t *blen)
+{
+	TEE_Result res;
+	uint32_t ta_endorsement_seed_size = 32;
+	uint8_t data[sizeof(TEE_UUID) + ta_endorsement_seed_size];
+	uint32_t bin[1 + ta_endorsement_seed_size / sizeof(uint32_t)];
+	uint32_t *bin_len = (uint32_t *)bin;
+	uint8_t *bin_val = (uint8_t *)(&bin[1]);
+
+	if (*blen < sizeof(bin)) {
+		*blen = sizeof(bin);
+		return TEE_ERROR_SHORT_BUFFER;
+	}
+	*blen = sizeof(bin);
+
+	memcpy(data, &sess->ctx->uuid, sizeof(TEE_UUID));
+
+	if (tee_otp_get_die_id(&data[sizeof(TEE_UUID)],
+			       ta_endorsement_seed_size))
+		return TEE_ERROR_BAD_STATE;
+
+	res = tee_hash_createdigest(TEE_ALG_SHA256, data, sizeof(data),
+				    bin_val, ta_endorsement_seed_size);
+	if (res != TEE_SUCCESS)
+		return TEE_ERROR_BAD_STATE;
+
+	*bin_len = ta_endorsement_seed_size;
+
+	return tee_svc_copy_to_user((void *)buf, bin, sizeof(bin));
+}
+
+static const struct tee_props vendor_propset_array_tee[] = {
+	{
+		.name = "com.microsoft.ta.endorsementSeed",
+		.prop_type = USER_TA_PROP_TYPE_BINARY_BLOCK,
+		.get_prop_func = get_prop_endorsement
+	},
+};
+
+const struct tee_vendor_props vendor_props_tee = {
+	.props = vendor_propset_array_tee,
+	.len = ARRAY_SIZE(vendor_propset_array_tee),
+};