--- /dev/null
+/*
+ * Copyright (c) 2022, Arm Limited. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+#include <assert.h>
+#include <stdint.h>
+
+#include <common/debug.h>
+#include <drivers/auth/crypto_mod.h>
+#include <drivers/measured_boot/rss/rss_measured_boot.h>
+#include <lib/psa/measured_boot.h>
+#include <psa/crypto_types.h>
+#include <psa/crypto_values.h>
+#include <psa/error.h>
+
+#define MBOOT_ALG_SHA512 0
+#define MBOOT_ALG_SHA384 1
+#define MBOOT_ALG_SHA256 2
+
+#if MBOOT_ALG_ID == MBOOT_ALG_SHA512
+#define CRYPTO_MD_ID CRYPTO_MD_SHA512
+#define PSA_CRYPTO_MD_ID PSA_ALG_SHA_512
+#elif MBOOT_ALG_ID == MBOOT_ALG_SHA384
+#define CRYPTO_MD_ID CRYPTO_MD_SHA384
+#define PSA_CRYPTO_MD_ID PSA_ALG_SHA_384
+#elif MBOOT_ALG_ID == MBOOT_ALG_SHA256
+#define CRYPTO_MD_ID CRYPTO_MD_SHA256
+#define PSA_CRYPTO_MD_ID PSA_ALG_SHA_256
+#else
+# error Invalid Measured Boot algorithm.
+#endif /* MBOOT_ALG_ID */
+
+/* Pointer to struct rss_mboot_metadata */
+static struct rss_mboot_metadata *plat_metadata_ptr;
+
+/* Functions' declarations */
+void rss_measured_boot_init(void)
+{
+ /* At this point it is expected that communication channel over MHU
+ * is already initialised by platform init.
+ */
+
+ /* Get pointer to platform's struct rss_mboot_metadata structure */
+ plat_metadata_ptr = plat_rss_mboot_get_metadata();
+ assert(plat_metadata_ptr != NULL);
+}
+
+int rss_mboot_measure_and_record(uintptr_t data_base, uint32_t data_size,
+ uint32_t data_id)
+{
+ unsigned char hash_data[CRYPTO_MD_MAX_SIZE];
+ int rc;
+ psa_status_t ret;
+ const struct rss_mboot_metadata *metadata_ptr = plat_metadata_ptr;
+
+ /* Get the metadata associated with this image. */
+ while ((metadata_ptr->id != RSS_MBOOT_INVALID_ID) &&
+ (metadata_ptr->id != data_id)) {
+ metadata_ptr++;
+ }
+
+ /* If image is not present in metadata array then skip */
+ if (metadata_ptr->id == RSS_MBOOT_INVALID_ID) {
+ return 0;
+ }
+
+ /* Calculate hash */
+ rc = crypto_mod_calc_hash(CRYPTO_MD_ID,
+ (void *)data_base, data_size, hash_data);
+ if (rc != 0) {
+ return rc;
+ }
+
+ ret = rss_measured_boot_extend_measurement(
+ metadata_ptr->slot,
+ metadata_ptr->signer_id,
+ metadata_ptr->signer_id_size,
+ metadata_ptr->version,
+ metadata_ptr->version_size,
+ PSA_CRYPTO_MD_ID,
+ metadata_ptr->sw_type,
+ metadata_ptr->sw_type_size,
+ hash_data,
+ MBOOT_DIGEST_SIZE,
+ metadata_ptr->lock_measurement);
+ if (ret != PSA_SUCCESS) {
+ return ret;
+ }
+
+ return 0;
+}
+
+int rss_mboot_set_signer_id(unsigned int img_id,
+ const void *pk_ptr,
+ size_t pk_len)
+{
+ unsigned char hash_data[CRYPTO_MD_MAX_SIZE];
+ struct rss_mboot_metadata *metadata_ptr = plat_metadata_ptr;
+ int rc;
+
+ /* Get the metadata associated with this image. */
+ while ((metadata_ptr->id != RSS_MBOOT_INVALID_ID) &&
+ (metadata_ptr->id != img_id)) {
+ metadata_ptr++;
+ }
+
+ /* If image is not present in metadata array then skip */
+ if (metadata_ptr->id == RSS_MBOOT_INVALID_ID) {
+ return 0;
+ }
+
+ /* Calculate public key hash */
+ rc = crypto_mod_calc_hash(CRYPTO_MD_ID, (void *)pk_ptr,
+ pk_len, hash_data);
+ if (rc != 0) {
+ return rc;
+ }
+
+ /* Update metadata struct with the received signer_id */
+ (void)memcpy(metadata_ptr->signer_id, hash_data, MBOOT_DIGEST_SIZE);
+ metadata_ptr->signer_id_size = MBOOT_DIGEST_SIZE;
+
+ return 0;
+}
--- /dev/null
+#
+# Copyright (c) 2022, Arm Limited. All rights reserved.
+#
+# SPDX-License-Identifier: BSD-3-Clause
+#
+
+# Hash algorithm for measured boot
+# SHA-256 (or stronger) is required.
+# TODO: The measurement algorithm incorrectly suggests that the TPM backend
+# is used which may not be the case. It is currently being worked on and
+# soon TPM_HASH_ALG will be replaced by a more generic name.
+TPM_HASH_ALG := sha256
+
+ifeq (${TPM_HASH_ALG}, sha512)
+ MBOOT_ALG_ID := MBOOT_ALG_SHA512
+ MBOOT_DIGEST_SIZE := 64U
+else ifeq (${TPM_HASH_ALG}, sha384)
+ MBOOT_ALG_ID := MBOOT_ALG_SHA384
+ MBOOT_DIGEST_SIZE := 48U
+else
+ MBOOT_ALG_ID := MBOOT_ALG_SHA256
+ MBOOT_DIGEST_SIZE := 32U
+endif #TPM_HASH_ALG
+
+# Set definitions for Measured Boot driver.
+$(eval $(call add_defines,\
+ $(sort \
+ MBOOT_ALG_ID \
+ MBOOT_DIGEST_SIZE \
+ MBOOT_RSS_BACKEND \
+)))
+
+MEASURED_BOOT_SRC_DIR := drivers/measured_boot/rss/
+
+MEASURED_BOOT_SOURCES += ${MEASURED_BOOT_SRC_DIR}rss_measured_boot.c
--- /dev/null
+/*
+ * Copyright (c) 2022, Arm Limited. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#ifndef RSS_MEASURED_BOOT_H
+#define RSS_MEASURED_BOOT_H
+
+#include <stdint.h>
+
+#include <common/debug.h>
+#include <measured_boot.h>
+
+#define RSS_MBOOT_INVALID_ID UINT32_MAX
+
+/*
+ * Each boot measurement has some metadata (i.e. a string) that identifies
+ * what was measured and how. The sw_type field of the rss_mboot_metadata
+ * structure represents the role of the software component that was measured.
+ * The below macros define strings suitable for the sw_type.
+ * The key thing is to choose meaningful strings so that when the attestation
+ * token is verified, then the different components can be identified.
+ */
+#define RSS_MBOOT_BL2_STRING "BL_2"
+#define RSS_MBOOT_BL31_STRING "SECURE_RT_EL3"
+#define RSS_MBOOT_FW_CONFIG_STRING "FW_CONFIG"
+#define RSS_MBOOT_TB_FW_CONFIG_STRING "TB_FW_CONFIG"
+#define RSS_MBOOT_RMM_STRING "RMM"
+
+
+struct rss_mboot_metadata {
+ unsigned int id;
+ uint8_t slot;
+ uint8_t signer_id[SIGNER_ID_MAX_SIZE];
+ size_t signer_id_size;
+ uint8_t version[VERSION_MAX_SIZE];
+ size_t version_size;
+ uint8_t sw_type[SW_TYPE_MAX_SIZE];
+ size_t sw_type_size;
+ bool lock_measurement;
+};
+
+/* Functions' declarations */
+void rss_measured_boot_init(void);
+struct rss_mboot_metadata *plat_rss_mboot_get_metadata(void);
+int rss_mboot_measure_and_record(uintptr_t data_base, uint32_t data_size,
+ uint32_t data_id);
+
+/* TODO: These metadata are currently not available during TF-A boot */
+int rss_mboot_set_signer_id(unsigned int img_id, const void *pk_ptr, size_t pk_len);
+
+#endif /* RSS_MEASURED_BOOT_H */
projects / arm-tf.git / commitdiff