vendorcode/eltan/security/lib: Implement SHA endian function

digest from vb2_digest_bufer() does not contains the correct endian.
Create cb_sha_endian() which can convert the calculated digest into big endian
or little endian when required.

BUG=N/A
TEST=Created binary and verify logging on Facebok FBG-1701

Change-Id: If828bde54c79e836a5b05ff0447645d7e06e819a
Signed-off-by: Frans Hendriks <fhendriks@eltan.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/30831
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Philipp Deppenwiese <zaolin.daisuki@gmail.com>

src/vendorcode/eltan/security/include/cb_sha.h

@@ -0,0 +1,33 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright (C) 2018-2019, Eltan B.V.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; version 2 of the License.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#ifndef __SECURITY_CB_SHA_H__
+#define __SECURITY_CB_SHA_H__
+
+#include <2rsa.h>
+#include <vb21_common.h>
+#include <vb2_api.h>
+
+/* Supported Algorithm types for hash */
+enum endian_algorithm {
+	NO_ENDIAN_ALGORITHM = 0,
+	BIG_ENDIAN_ALGORITHM = 1,
+	LITTLE_ENDIAN_ALGORITHM = 2,
+};
+
+int cb_sha_endian(enum vb2_hash_algorithm hash_alg, const uint8_t *data, uint32_t len,
+		  uint8_t *digest, enum endian_algorithm endian);
+
+#endif

src/vendorcode/eltan/security/lib/Makefile.inc

@@ -0,0 +1,59 @@
+#
+# This file is part of the coreboot project.
+#
+# Copyright (C) 2018-2019 Eltan B.V.
+#
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; version 2 of the License.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+
+# call with $1 = stage name to create rules for building the library
+# for the stage and adding it to the stage's set of object files.
+define vendor-security-lib
+VEN_SEC_LIB_$(1) = $(obj)/external/ven_sec_lib-$(1)/vboot_fw21.a
+VEN_SEC_CFLAGS_$(1) += $$(patsubst -I%,-I$(top)/%,\
+		$$(patsubst $(src)/%.h,$(top)/$(src)/%.h,\
+		$$(filter-out -I$(obj), $$(CPPFLAGS_$(1)))))
+VEN_SEC_CFLAGS_$(1) += $$(CFLAGS_$(1))
+VEN_SEC_CFLAGS_$(1) += $$($(1)-c-ccopts)
+VEN_SEC_CFLAGS_$(1) += -I$(abspath $(obj)) -Wno-missing-prototypes
+
+$$(VEN_SEC_LIB_$(1)): $(obj)/config.h
+	printf "    MAKE       $(subst $(obj)/,,$(@))\n"
+	+FIRMWARE_ARCH=$$(ARCHDIR-$$(ARCH-$(1)-y)) \
+	CC="$$(CC_$(1))" \
+	CFLAGS="$$(VEN_SEC_CFLAGS_$(1))" VBOOT2="y" \
+	$(MAKE) -C $(VBOOT_SOURCE) \
+		BUILD=$$(abspath $$(dir $$(VEN_SEC_LIB_$(1)))) \
+		V=$(V) \
+		fwlib21
+endef # vendor-security-for-stage
+
+CFLAGS_common += -I3rdparty/vboot/firmware/2lib/include
+CFLAGS_common += -I3rdparty/vboot/firmware/lib21/include
+
+ifneq ($(filter y,$(CONFIG_VENDORCODE_ELTAN_VBOOT) $(CONFIG_VENDORCODE_ELTAN_MBOOT)),)
+
+bootblock-$(CONFIG_C_ENVIRONMENT_BOOTBLOCK) += cb_sha.c
+$(eval $(call vendor-security-lib,bootblock))
+bootblock-srcs  += $(obj)/external/ven_sec_lib-bootblock/vboot_fw21.a
+
+postcar-y += cb_sha.c
+$(eval $(call vendor-security-lib,postcar))
+postcar-srcs += $(obj)/external/ven_sec_lib-postcar/vboot_fw21.a
+
+ramstage-y += cb_sha.c
+$(eval $(call vendor-security-lib,ramstage))
+ramstage-srcs += $(obj)/external/ven_sec_lib-ramstage/vboot_fw21.a
+
+romstage-y += cb_sha.c
+$(eval $(call vendor-security-lib,romstage))
+romstage-srcs += $(obj)/external/ven_sec_lib-romstage/vboot_fw21.a
+
+endif

src/vendorcode/eltan/security/lib/cb_sha.c

@@ -0,0 +1,56 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright (C) 2019 Eltan B.V.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; version 2 of the License.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <cb_sha.h>
+
+int cb_sha_endian(enum vb2_hash_algorithm hash_alg, const uint8_t *data, uint32_t len,
+		  uint8_t *digest, enum endian_algorithm endian)
+{
+	int i;
+	int rv;
+	uint32_t digest_size;
+	uint8_t *result_ptr;
+	uint8_t result[VB2_MAX_DIGEST_SIZE];
+
+	switch (hash_alg) {
+	case VB2_HASH_SHA1:
+	        digest_size = VB2_SHA1_DIGEST_SIZE;
+		break;
+	case VB2_HASH_SHA256:
+	        digest_size = VB2_SHA256_DIGEST_SIZE;
+		break;
+	case VB2_HASH_SHA512:
+	        digest_size = VB2_SHA512_DIGEST_SIZE;
+		break;
+	default:
+		return VB2_ERROR_SHA_INIT_ALGORITHM;
+	}
+
+	result_ptr = result;
+	rv = vb2_digest_buffer(data, len, hash_alg, result_ptr, digest_size);
+	if (rv || (endian == NO_ENDIAN_ALGORITHM))
+		return rv;
+
+	for (i = 0; i < digest_size; ++i) {
+		if (endian == BIG_ENDIAN_ALGORITHM) {
+			/* use big endian */
+			digest[i] = *result_ptr++;
+		} else {
+			/* use little endian */
+			digest[digest_size - i - 1] = *result_ptr++;
+		}
+	}
+	return rv;
+}