refactor(security): add OpenSSL 1.x compatibility

When updated to work with OpenSSL 3.0, the host tools lost their
compatibility with previous versions (1.x) of OpenSSL. This is
mainly due to the fact that 1.x APIs became deprecated in 3.0 and
therefore their use cause compiling errors. In addition, updating
for a newer version of OpenSSL meant improving the stability
against security threats. However, although version 1.1.1 is
now deprecated, it still receives security updates, so it would
not imply major security issues to keep compatibility with it too.

This patch adds backwards compatibility with OpenSSL 1.x versions
by adding back 1.x API code. It defines a macro USING_OPENSSL3,
which will select the appropriate OpenSSL API version depending on
the OpenSSL library path chosen (which is determined by the
already-existing OPENSSL_DIR variable).

In addition, cleanup items were packed in functions and moved to
the proper modules in order to make the code more maintainable and
legible.

Signed-off-by: Juan Pablo Conde <juanpablo.conde@arm.com>
Change-Id: I8deceb5e419edc73277792861882404790ccd33c

Makefile

@@ -1467,7 +1467,7 @@ checkpatch:		locate-checkpatch
 certtool: ${CRTTOOL}
 
 ${CRTTOOL}: FORCE
-	${Q}${MAKE} PLAT=${PLAT} USE_TBBR_DEFS=${USE_TBBR_DEFS} COT=${COT} OPENSSL_DIR=${OPENSSL_DIR} CRTTOOL=${CRTTOOL} --no-print-directory -C ${CRTTOOLPATH}
+	${Q}${MAKE} PLAT=${PLAT} USE_TBBR_DEFS=${USE_TBBR_DEFS} COT=${COT} OPENSSL_DIR=${OPENSSL_DIR} CRTTOOL=${CRTTOOL} DEBUG=${DEBUG} V=${V} --no-print-directory -C ${CRTTOOLPATH}
 	@${ECHO_BLANK_LINE}
 	@echo "Built $@ successfully"
 	@${ECHO_BLANK_LINE}
@@ -1512,7 +1512,7 @@ fwu_fip: ${BUILD_PLAT}/${FWU_FIP_NAME}
 
 ${FIPTOOL}: FORCE
 ifdef UNIX_MK
-	${Q}${MAKE} CPPFLAGS="-DVERSION='\"${VERSION_STRING}\"'" FIPTOOL=${FIPTOOL} OPENSSL_DIR=${OPENSSL_DIR} --no-print-directory -C ${FIPTOOLPATH}
+	${Q}${MAKE} CPPFLAGS="-DVERSION='\"${VERSION_STRING}\"'" FIPTOOL=${FIPTOOL} OPENSSL_DIR=${OPENSSL_DIR} DEBUG=${DEBUG} V=${V} --no-print-directory -C ${FIPTOOLPATH}
 else
 # Clear the MAKEFLAGS as we do not want
 # to pass the gnumake flags to nmake.
@@ -1533,7 +1533,7 @@ doc:
 enctool: ${ENCTOOL}
 
 ${ENCTOOL}: FORCE
-	${Q}${MAKE} PLAT=${PLAT} BUILD_INFO=0 OPENSSL_DIR=${OPENSSL_DIR} ENCTOOL=${ENCTOOL} --no-print-directory -C ${ENCTOOLPATH}
+	${Q}${MAKE} PLAT=${PLAT} BUILD_INFO=0 OPENSSL_DIR=${OPENSSL_DIR} ENCTOOL=${ENCTOOL} DEBUG=${DEBUG} V=${V} --no-print-directory -C ${ENCTOOLPATH}
 	@${ECHO_BLANK_LINE}
 	@echo "Built $@ successfully"
 	@${ECHO_BLANK_LINE}

docs/getting_started/prerequisites.rst

@@ -54,15 +54,15 @@ The following tools are required to obtain and build |TF-A|:
 The following libraries must be available to build one or more components or
 supporting tools:
 
-- OpenSSL >= 3.0
+- OpenSSL >= 1.1.1 (v3.0.0 to v3.0.6 highly discouraged due to security issues)
 
-   Required to build the cert_create tool.
+   Required to build the cert_create, encrypt_fw, and fiptool tools.
 
    .. note::
 
-    OpenSSL 3.0 has to be built from source code, as it's not available in
-    the default package repositories in recent Ubuntu versions. Please refer
-    to the OpenSSL project documentation for more information.
+    If using OpenSSL 3, older Linux versions may require it to be built from
+    source code, as it may not be available in the default package repositories.
+    Please refer to the OpenSSL project documentation for more information.
 
 The following libraries are required for Trusted Board Boot and Measured Boot
 support:

make_helpers/build_macros.mk

@@ -1,5 +1,5 @@
 #
-# Copyright (c) 2015-2022, ARM Limited and Contributors. All rights reserved.
+# Copyright (c) 2015-2022, Arm Limited and Contributors. All rights reserved.
 #
 # SPDX-License-Identifier: BSD-3-Clause
 #
@@ -238,6 +238,20 @@ check_$(1):
 	$(check_$(1)_cmd)
 endef
 
+# SELECT_OPENSSL_API_VERSION selects the OpenSSL API version to be used to
+# build the host tools by checking the version of OpenSSL located under
+# the path defined by the OPENSSL_DIR variable. It receives no parameters.
+define SELECT_OPENSSL_API_VERSION
+    # Set default value for USING_OPENSSL3 macro to 0
+    $(eval USING_OPENSSL3 = 0)
+    # Obtain the OpenSSL version for the build located under OPENSSL_DIR
+    $(eval OPENSSL_INFO := $(shell LD_LIBRARY_PATH=${OPENSSL_DIR}:${OPENSSL_DIR}/lib ${OPENSSL_BIN_PATH}/openssl version))
+    $(eval OPENSSL_CURRENT_VER = $(word 2, ${OPENSSL_INFO}))
+    $(eval OPENSSL_CURRENT_VER_MAJOR = $(firstword $(subst ., ,$(OPENSSL_CURRENT_VER))))
+    # If OpenSSL version is 3.x, then set USING_OPENSSL3 flag to 1
+    $(if $(filter 3,$(OPENSSL_CURRENT_VER_MAJOR)), $(eval USING_OPENSSL3 = 1))
+endef
+
 ################################################################################
 # Generic image processing filters
 ################################################################################

make_helpers/defaults.mk

@@ -419,7 +419,7 @@ RAS_TRAP_NS_ERR_REC_ACCESS	:= 0
 # Build option to create cot descriptors using fconf
 COT_DESC_IN_DTB			:= 0
 
-# Build option to provide openssl directory path
+# Build option to provide OpenSSL directory path
 OPENSSL_DIR			:= /usr
 
 # Select the openssl binary provided in OPENSSL_DIR variable

tools/cert_create/Makefile

@@ -1,5 +1,5 @@
 #
-# Copyright (c) 2015-2022, ARM Limited and Contributors. All rights reserved.
+# Copyright (c) 2015-2022, Arm Limited and Contributors. All rights reserved.
 #
 # SPDX-License-Identifier: BSD-3-Clause
 #
@@ -9,12 +9,12 @@ V		?= 0
 DEBUG		:= 0
 CRTTOOL		?= cert_create${BIN_EXT}
 BINARY		:= $(notdir ${CRTTOOL})
-OPENSSL_DIR	:= /usr
 COT		:= tbbr
 
 MAKE_HELPERS_DIRECTORY := ../../make_helpers/
 include ${MAKE_HELPERS_DIRECTORY}build_macros.mk
 include ${MAKE_HELPERS_DIRECTORY}build_env.mk
+include ${MAKE_HELPERS_DIRECTORY}defaults.mk
 
 ifneq (${PLAT},none)
 TF_PLATFORM_ROOT	:=	../../plat/
@@ -45,6 +45,10 @@ ifneq (,$(wildcard ${PLAT_CERT_CREATE_HELPER_MK}))
 include ${PLAT_CERT_CREATE_HELPER_MK}
 endif
 
+# Select OpenSSL version flag according to the OpenSSL build selected
+# from setting the OPENSSL_DIR path.
+$(eval $(call SELECT_OPENSSL_API_VERSION))
+
 HOSTCCFLAGS := -Wall -std=c99
 
 ifeq (${DEBUG},1)
@@ -60,6 +64,9 @@ else
 endif
 
 HOSTCCFLAGS += ${DEFINES}
+# USING_OPENSSL3 flag will be added to the HOSTCCFLAGS variable with the proper
+# computed value.
+HOSTCCFLAGS += -DUSING_OPENSSL3=$(USING_OPENSSL3)
 
 # Make soft links and include from local directory otherwise wrong headers
 # could get pulled in from firmware tree.
@@ -76,11 +83,11 @@ LIB := -lssl -lcrypto
 
 HOSTCC ?= gcc
 
-.PHONY: all clean realclean
+.PHONY: all clean realclean --openssl
 
 all: ${BINARY}
 
-${BINARY}: ${OBJECTS} Makefile
+${BINARY}: --openssl ${OBJECTS} Makefile
 	@echo "  HOSTLD  $@"
 	@echo 'const char build_msg[] = "Built : "__TIME__", "__DATE__; \
                 const char platform_msg[] = "${PLAT_MSG}";' | \
@@ -91,6 +98,11 @@ ${BINARY}: ${OBJECTS} Makefile
 	@echo "  HOSTCC  $<"
 	${Q}${HOSTCC} -c ${HOSTCCFLAGS} ${INC_DIR} $< -o $@
 
+--openssl:
+ifeq ($(DEBUG),1)
+	@echo "Selected OpenSSL version: ${OPENSSL_CURRENT_VER}"
+endif
+
 clean:
 	$(call SHELL_DELETE_ALL, src/build_msg.o ${OBJECTS})
 

tools/cert_create/include/cert.h

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2015-2021, ARM Limited and Contributors. All rights reserved.
+ * Copyright (c) 2015-2022, ARM Limited and Contributors. All rights reserved.
  *
  * SPDX-License-Identifier: BSD-3-Clause
  */
@@ -54,6 +54,7 @@ int cert_new(
 	int days,
 	int ca,
 	STACK_OF(X509_EXTENSION) * sk);
+void cert_cleanup(void);
 
 /* Macro to register the certificates used in the CoT */
 #define REGISTER_COT(_certs) \

tools/cert_create/include/ext.h

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2015-2021, ARM Limited and Contributors. All rights reserved.
+ * Copyright (c) 2015-2022, ARM Limited and Contributors. All rights reserved.
  *
  * SPDX-License-Identifier: BSD-3-Clause
  */
@@ -72,6 +72,7 @@ X509_EXTENSION *ext_new_hash(int nid, int crit, const EVP_MD *md,
 		unsigned char *buf, size_t len);
 X509_EXTENSION *ext_new_nvcounter(int nid, int crit, int value);
 X509_EXTENSION *ext_new_key(int nid, int crit, EVP_PKEY *k);
+void ext_cleanup(void);
 
 /* Macro to register the extensions used in the CoT */
 #define REGISTER_EXTENSIONS(_ext) \

tools/cert_create/include/key.h

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2015-2021, ARM Limited and Contributors. All rights reserved.
+ * Copyright (c) 2015-2022, Arm Limited and Contributors. All rights reserved.
  *
  * SPDX-License-Identifier: BSD-3-Clause
  */
@@ -66,10 +66,13 @@ typedef struct key_s {
 /* Exported API */
 int key_init(void);
 key_t *key_get_by_opt(const char *opt);
+#if !USING_OPENSSL3
 int key_new(key_t *key);
+#endif
 int key_create(key_t *key, int type, int key_bits);
 int key_load(key_t *key, unsigned int *err_code);
 int key_store(key_t *key);
+void key_cleanup(void);
 
 /* Macro to register the keys used in the CoT */
 #define REGISTER_KEYS(_keys) \

tools/cert_create/src/cert.c

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2015-2022, ARM Limited and Contributors. All rights reserved.
+ * Copyright (c) 2015-2022, Arm Limited and Contributors. All rights reserved.
  *
  * SPDX-License-Identifier: BSD-3-Clause
  */
@@ -39,7 +39,11 @@ int rand_serial(BIGNUM *b, ASN1_INTEGER *ai)
 	if (!btmp)
 		return 0;
 
+#if USING_OPENSSL3
 	if (!BN_rand(btmp, SERIAL_RAND_BITS, 0, 0))
+#else
+	if (!BN_pseudo_rand(btmp, SERIAL_RAND_BITS, 0, 0))
+#endif
 		goto error;
 	if (ai && !BN_to_ASN1_INTEGER(btmp, ai))
 		goto error;
@@ -272,3 +276,19 @@ cert_t *cert_get_by_opt(const char *opt)
 
 	return NULL;
 }
+
+void cert_cleanup(void)
+{
+	unsigned int i;
+
+	for (i = 0; i < num_certs; i++) {
+		if (certs[i].fn != NULL) {
+			void *ptr = (void *)certs[i].fn;
+
+			certs[i].fn = NULL;
+			free(ptr);
+		}
+	}
+	free(certs);
+}
+

tools/cert_create/src/ext.c

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2015-2021, ARM Limited and Contributors. All rights reserved.
+ * Copyright (c) 2015-2022, ARM Limited and Contributors. All rights reserved.
  *
  * SPDX-License-Identifier: BSD-3-Clause
  */
@@ -315,3 +315,20 @@ ext_t *ext_get_by_opt(const char *opt)
 
 	return NULL;
 }
+
+void ext_cleanup(void)
+{
+	unsigned int i;
+
+	for (i = 0; i < num_extensions; i++) {
+		if (extensions[i].arg != NULL) {
+			void *ptr = (void *)extensions[i].arg;
+
+			extensions[i].arg = NULL;
+			free(ptr);
+		}
+	}
+	free(extensions);
+	X509V3_EXT_cleanup();
+}
+

tools/cert_create/src/key.c

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2015-2022, ARM Limited and Contributors. All rights reserved.
+ * Copyright (c) 2015-2022, Arm Limited and Contributors. All rights reserved.
  *
  * SPDX-License-Identifier: BSD-3-Clause
  */
@@ -24,6 +24,7 @@
 key_t *keys;
 unsigned int num_keys;
 
+#if !USING_OPENSSL3
 /*
  * Create a new key container
  */
@@ -37,9 +38,11 @@ int key_new(key_t *key)
 
 	return 1;
 }
+#endif
 
 static int key_create_rsa(key_t *key, int key_bits)
 {
+#if USING_OPENSSL3
 	EVP_PKEY *rsa = EVP_RSA_gen(key_bits);
 	if (rsa == NULL) {
 		printf("Cannot generate RSA key\n");
@@ -47,11 +50,52 @@ static int key_create_rsa(key_t *key, int key_bits)
 	}
 	key->key = rsa;
 	return 1;
+#else
+	BIGNUM *e;
+	RSA *rsa = NULL;
+
+	e = BN_new();
+	if (e == NULL) {
+		printf("Cannot create RSA exponent\n");
+		return 0;
+	}
+
+	if (!BN_set_word(e, RSA_F4)) {
+		printf("Cannot assign RSA exponent\n");
+		goto err2;
+	}
+
+	rsa = RSA_new();
+	if (rsa == NULL) {
+		printf("Cannot create RSA key\n");
+		goto err2;
+	}
+
+	if (!RSA_generate_key_ex(rsa, key_bits, e, NULL)) {
+		printf("Cannot generate RSA key\n");
+		goto err;
+	}
+
+	if (!EVP_PKEY_assign_RSA(key->key, rsa)) {
+		printf("Cannot assign RSA key\n");
+		goto err;
+	}
+
+	BN_free(e);
+	return 1;
+
+err:
+	RSA_free(rsa);
+err2:
+	BN_free(e);
+	return 0;
+#endif
 }
 
 #ifndef OPENSSL_NO_EC
 static int key_create_ecdsa(key_t *key, int key_bits)
 {
+#if USING_OPENSSL3
 	EVP_PKEY *ec = EVP_EC_gen("prime256v1");
 	if (ec == NULL) {
 		printf("Cannot generate EC key\n");
@@ -59,6 +103,31 @@ static int key_create_ecdsa(key_t *key, int key_bits)
 	}
 	key->key = ec;
 	return 1;
+#else
+	EC_KEY *ec;
+
+	ec = EC_KEY_new_by_curve_name(NID_X9_62_prime256v1);
+	if (ec == NULL) {
+		printf("Cannot create EC key\n");
+		return 0;
+	}
+	if (!EC_KEY_generate_key(ec)) {
+		printf("Cannot generate EC key\n");
+		goto err;
+	}
+	EC_KEY_set_flags(ec, EC_PKEY_NO_PARAMETERS);
+	EC_KEY_set_asn1_flag(ec, OPENSSL_EC_NAMED_CURVE);
+	if (!EVP_PKEY_assign_EC_KEY(key->key, ec)) {
+		printf("Cannot assign EC key\n");
+		goto err;
+	}
+
+	return 1;
+
+err:
+	EC_KEY_free(ec);
+	return 0;
+#endif
 }
 #endif /* OPENSSL_NO_EC */
 
@@ -194,3 +263,20 @@ key_t *key_get_by_opt(const char *opt)
 
 	return NULL;
 }
+
+void key_cleanup(void)
+{
+	unsigned int i;
+
+	for (i = 0; i < num_keys; i++) {
+		EVP_PKEY_free(keys[i].key);
+		if (keys[i].fn != NULL) {
+			void *ptr = keys[i].fn;
+
+			free(ptr);
+			keys[i].fn = NULL;
+		}
+	}
+	free(keys);
+}
+

tools/cert_create/src/main.c

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2015-2021, ARM Limited and Contributors. All rights reserved.
+ * Copyright (c) 2015-2022, Arm Limited and Contributors. All rights reserved.
  *
  * SPDX-License-Identifier: BSD-3-Clause
  */
@@ -430,10 +430,12 @@ int main(int argc, char *argv[])
 
 	/* Load private keys from files (or generate new ones) */
 	for (i = 0 ; i < num_keys ; i++) {
+#if !USING_OPENSSL3
 		if (!key_new(&keys[i])) {
 			ERROR("Failed to allocate key container\n");
 			exit(1);
 		}
+#endif
 
 		/* First try to load the key from disk */
 		if (key_load(&keys[i], &err_code)) {
@@ -594,9 +596,7 @@ int main(int argc, char *argv[])
 	/* If we got here, then we must have filled the key array completely.
 	 * We can then safely call free on all of the keys in the array
 	 */
-	for (i = 0; i < num_keys; i++) {
-		EVP_PKEY_free(keys[i].key);
-	}
+	key_cleanup();
 
 #ifndef OPENSSL_NO_ENGINE
 	ENGINE_cleanup();
@@ -605,30 +605,10 @@ int main(int argc, char *argv[])
 
 
 	/* We allocated strings through strdup, so now we have to free them */
-	for (i = 0; i < num_keys; i++) {
-		if (keys[i].fn != NULL) {
-			void *ptr = keys[i].fn;
-
-			keys[i].fn = NULL;
-			free(ptr);
-		}
-	}
-	for (i = 0; i < num_extensions; i++) {
-		if (extensions[i].arg != NULL) {
-			void *ptr = (void *)extensions[i].arg;
 
-			extensions[i].arg = NULL;
-			free(ptr);
-		}
-	}
-	for (i = 0; i < num_certs; i++) {
-		if (certs[i].fn != NULL) {
-			void *ptr = (void *)certs[i].fn;
+	ext_cleanup();
 
-			certs[i].fn = NULL;
-			free(ptr);
-		}
-	}
+	cert_cleanup();
 
 	return 0;
 }

tools/cert_create/src/sha.c

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2015-2022, ARM Limited and Contributors. All rights reserved.
+ * Copyright (c) 2015-2022, Arm Limited and Contributors. All rights reserved.
  *
  * SPDX-License-Identifier: BSD-3-Clause
  */
@@ -7,11 +7,16 @@
 #include <stdio.h>
 #include "debug.h"
 #include "key.h"
+#if USING_OPENSSL3
 #include <openssl/evp.h>
 #include <openssl/obj_mac.h>
+#else
+#include <openssl/sha.h>
+#endif
 
 #define BUFFER_SIZE	256
 
+#if USING_OPENSSL3
 static int get_algorithm_nid(int hash_alg)
 {
 	int nids[] = {NID_sha256, NID_sha384, NID_sha512};
@@ -20,16 +25,22 @@ static int get_algorithm_nid(int hash_alg)
 	}
 	return nids[hash_alg];
 }
+#endif
 
 int sha_file(int md_alg, const char *filename, unsigned char *md)
 {
 	FILE *inFile;
+	int bytes;
+	unsigned char data[BUFFER_SIZE];
+#if USING_OPENSSL3
 	EVP_MD_CTX *mdctx;
 	const EVP_MD *md_type;
-	int bytes;
 	int alg_nid;
 	unsigned int total_bytes;
-	unsigned char data[BUFFER_SIZE];
+#else
+	SHA256_CTX shaContext;
+	SHA512_CTX sha512Context;
+#endif
 
 	if ((filename == NULL) || (md == NULL)) {
 		ERROR("%s(): NULL argument\n", __func__);
@@ -42,6 +53,8 @@ int sha_file(int md_alg, const char *filename, unsigned char *md)
 		return 0;
 	}
 
+#if USING_OPENSSL3
+
 	mdctx = EVP_MD_CTX_new();
 	if (mdctx == NULL) {
 		fclose(inFile);
@@ -74,5 +87,32 @@ err:
 	fclose(inFile);
 	EVP_MD_CTX_free(mdctx);
 	return 0;
+
+#else
+
+	if (md_alg == HASH_ALG_SHA384) {
+		SHA384_Init(&sha512Context);
+		while ((bytes = fread(data, 1, BUFFER_SIZE, inFile)) != 0) {
+			SHA384_Update(&sha512Context, data, bytes);
+		}
+		SHA384_Final(md, &sha512Context);
+	} else if (md_alg == HASH_ALG_SHA512) {
+		SHA512_Init(&sha512Context);
+		while ((bytes = fread(data, 1, BUFFER_SIZE, inFile)) != 0) {
+			SHA512_Update(&sha512Context, data, bytes);
+		}
+		SHA512_Final(md, &sha512Context);
+	} else {
+		SHA256_Init(&shaContext);
+		while ((bytes = fread(data, 1, BUFFER_SIZE, inFile)) != 0) {
+			SHA256_Update(&shaContext, data, bytes);
+		}
+		SHA256_Final(md, &shaContext);
+	}
+
+	fclose(inFile);
+	return 1;
+
+#endif
 }
 

tools/encrypt_fw/Makefile

@@ -11,15 +11,21 @@ ENCTOOL		?= encrypt_fw${BIN_EXT}
 BINARY		:= $(notdir ${ENCTOOL})
 OPENSSL_DIR	:= /usr
 
+
+MAKE_HELPERS_DIRECTORY := ../../make_helpers/
+include ${MAKE_HELPERS_DIRECTORY}build_macros.mk
+include ${MAKE_HELPERS_DIRECTORY}build_env.mk
+include ${MAKE_HELPERS_DIRECTORY}defaults.mk
+
 OBJECTS := src/encrypt.o \
            src/cmd_opt.o \
            src/main.o
 
 HOSTCCFLAGS := -Wall -std=c99
 
-MAKE_HELPERS_DIRECTORY := ../../make_helpers/
-include ${MAKE_HELPERS_DIRECTORY}build_macros.mk
-include ${MAKE_HELPERS_DIRECTORY}build_env.mk
+# Select OpenSSL version flag according to the OpenSSL build selected
+# from setting the OPENSSL_DIR path.
+$(eval $(call SELECT_OPENSSL_API_VERSION))
 
 ifeq (${DEBUG},1)
   HOSTCCFLAGS += -g -O0 -DDEBUG -DLOG_LEVEL=40
@@ -36,6 +42,12 @@ else
   Q :=
 endif
 
+HOSTCCFLAGS += ${DEFINES}
+# USING_OPENSSL3 flag will be added to the HOSTCCFLAGS variable with the proper
+# computed value.
+HOSTCCFLAGS += -DUSING_OPENSSL3=$(USING_OPENSSL3)
+
+
 # Make soft links and include from local directory otherwise wrong headers
 # could get pulled in from firmware tree.
 INC_DIR := -I ./include -I ../../include/tools_share -I ${OPENSSL_DIR}/include
@@ -51,11 +63,11 @@ LIB := -lssl -lcrypto
 
 HOSTCC ?= gcc
 
-.PHONY: all clean realclean
+.PHONY: all clean realclean --openssl
 
 all: ${BINARY}
 
-${BINARY}: ${OBJECTS} Makefile
+${BINARY}: --openssl ${OBJECTS} Makefile
 	@echo "  HOSTLD  $@"
 	@echo 'const char build_msg[] = "Built : "__TIME__", "__DATE__;' | \
                 ${HOSTCC} -c ${HOSTCCFLAGS} -xc - -o src/build_msg.o
@@ -65,6 +77,11 @@ ${BINARY}: ${OBJECTS} Makefile
 	@echo "  HOSTCC  $<"
 	${Q}${HOSTCC} -c ${HOSTCCFLAGS} ${INC_DIR} $< -o $@
 
+--openssl:
+ifeq ($(DEBUG),1)
+	@echo "Selected OpenSSL version: ${OPENSSL_CURRENT_VER}"
+endif
+
 clean:
 	$(call SHELL_DELETE_ALL, src/build_msg.o ${OBJECTS})
 

tools/fiptool/Makefile

@@ -1,5 +1,5 @@
 #
-# Copyright (c) 2014-2022, ARM Limited and Contributors. All rights reserved.
+# Copyright (c) 2014-2022, Arm Limited and Contributors. All rights reserved.
 #
 # SPDX-License-Identifier: BSD-3-Clause
 #
@@ -7,6 +7,7 @@
 MAKE_HELPERS_DIRECTORY := ../../make_helpers/
 include ${MAKE_HELPERS_DIRECTORY}build_macros.mk
 include ${MAKE_HELPERS_DIRECTORY}build_env.mk
+include ${MAKE_HELPERS_DIRECTORY}defaults.mk
 
 FIPTOOL ?= fiptool${BIN_EXT}
 PROJECT := $(notdir ${FIPTOOL})
@@ -23,6 +24,15 @@ else
   HOSTCCFLAGS += -O2
 endif
 
+# Select OpenSSL version flag according to the OpenSSL build selected
+# from setting the OPENSSL_DIR path.
+$(eval $(call SELECT_OPENSSL_API_VERSION))
+
+HOSTCCFLAGS += ${DEFINES}
+# USING_OPENSSL3 flag will be added to the HOSTCCFLAGS variable with the proper
+# computed value.
+HOSTCCFLAGS += -DUSING_OPENSSL3=$(USING_OPENSSL3)
+
 # Include library directories where OpenSSL library files are located.
 # For a normal installation (i.e.: when ${OPENSSL_DIR} = /usr or
 # /usr/local), binaries are located under the ${OPENSSL_DIR}/lib/
@@ -51,11 +61,11 @@ ifneq (,$(wildcard ${PLAT_FIPTOOL_HELPER_MK}))
 include ${PLAT_FIPTOOL_HELPER_MK}
 endif
 
-.PHONY: all clean distclean
+.PHONY: all clean distclean --openssl
 
 all: ${PROJECT}
 
-${PROJECT}: ${OBJECTS} Makefile
+${PROJECT}: --openssl ${OBJECTS} Makefile
 	@echo "  HOSTLD  $@"
 	${Q}${HOSTCC} ${OBJECTS} -o $@ ${LDLIBS}
 	@${ECHO_BLANK_LINE}
@@ -66,5 +76,11 @@ ${PROJECT}: ${OBJECTS} Makefile
 	@echo "  HOSTCC  $<"
 	${Q}${HOSTCC} -c ${CPPFLAGS} ${HOSTCCFLAGS} ${INCLUDE_PATHS} $< -o $@
 
+--openssl:
+ifeq ($(DEBUG),1)
+	@echo "Selected OpenSSL version: ${OPENSSL_CURRENT_VER}"
+endif
+
+
 clean:
 	$(call SHELL_DELETE_ALL, ${PROJECT} ${OBJECTS})