[SLOF] [PATCH v4 4/5] tcgbios: Add test cases and test script to run them

[Stefan Berger]

From: Stefan Berger <stefanb at linux.ibm.com>

Add test cases for sha1, sha256, sha384, and sha512 and a test script
to run the test cases.

The tests are passing on little and big endian machines (Fedora 28).

Signed-off-by: Stefan Berger <stefanb at linux.ibm.com>
---
 lib/libtpm/sha.c      | 27 ++++++++++++++++++++
 lib/libtpm/sha256.c   | 26 +++++++++++++++++++
 lib/libtpm/sha512.c   | 36 ++++++++++++++++++++++++++
 lib/libtpm/sha_test.h | 59 +++++++++++++++++++++++++++++++++++++++++++
 lib/libtpm/test.sh    | 31 +++++++++++++++++++++++
 5 files changed, 179 insertions(+)
 create mode 100644 lib/libtpm/sha_test.h
 create mode 100755 lib/libtpm/test.sh

diff --git a/lib/libtpm/sha.c b/lib/libtpm/sha.c
index 43de658..902a4ba 100644
--- a/lib/libtpm/sha.c
+++ b/lib/libtpm/sha.c
@@ -203,3 +203,30 @@ void sha1(const uint8_t *data, uint32_t length, uint8_t *hash)
 	sha1_do(&ctx, data, length);
 	memcpy(hash, &ctx.h[0], 20);
 }
+
+#ifdef MAIN
+
+#include "sha_test.h"
+
+int main(void)
+{
+	TESTVECTORS(data);
+	uint8_t hash[20];
+	char input[64];
+	int err = 0;
+	size_t i;
+
+	for (i = 0; i < ARRAY_SIZE(data); i++)
+		err |= test_hash(sha1, hash, sizeof(hash),
+				 data[i], strlen(data[i]),
+				 SHA1);
+
+	memset(input, 'a', sizeof(input));
+	/* cover critical input size around 56 bytes */
+	for (i = 50; i < sizeof(input); i++)
+		err |= test_hash(sha1, hash, sizeof(hash),
+				 input, i, SHA1);
+
+	return err;
+}
+#endif
diff --git a/lib/libtpm/sha256.c b/lib/libtpm/sha256.c
index 1a0aa9a..79bcb83 100644
--- a/lib/libtpm/sha256.c
+++ b/lib/libtpm/sha256.c
@@ -218,3 +218,29 @@ void sha256(const uint8_t *data, uint32_t length, uint8_t *hash)
 	sha256_do(&ctx, data, length);
 	memcpy(hash, ctx.h, sizeof(ctx.h));
 }
+
+#ifdef MAIN
+
+#include "sha_test.h"
+
+int main(void)
+{
+	TESTVECTORS(data);
+	uint8_t hash[32];
+	char input[64];
+	int err = 0;
+	size_t i;
+
+	for (i = 0; i < ARRAY_SIZE(data); i++)
+		err |= test_hash(sha256, hash, sizeof(hash),
+				 data[i], strlen(data[i]),
+				 SHA256);
+
+	memset(input, 'a', sizeof(input));
+	/* cover critical input size around 56 bytes */
+	for (i = 50; i < sizeof(input); i++)
+		err |= test_hash(sha256, hash, sizeof(hash), input, i, SHA256);
+
+	return err;
+}
+#endif
diff --git a/lib/libtpm/sha512.c b/lib/libtpm/sha512.c
index f9267ef..86831ab 100644
--- a/lib/libtpm/sha512.c
+++ b/lib/libtpm/sha512.c
@@ -247,3 +247,39 @@ void sha512(const uint8_t *data, uint32_t length, uint8_t *hash)
 	sha512_do(&ctx, data, length);
 	memcpy(hash, ctx.h, sizeof(ctx.h));
 }
+
+
+#ifdef MAIN
+
+#include "sha_test.h"
+
+int main(void)
+{
+	TESTVECTORS(data);
+	uint8_t hash512[64];
+	uint8_t hash384[48];
+	char input[128];
+	int err = 0;
+	size_t i;
+
+	for (i = 0; i < ARRAY_SIZE(data); i++) {
+		err |= test_hash(sha384, hash384, sizeof(hash384),
+				 data[i], strlen(data[i]),
+				 SHA384);
+		err |= test_hash(sha512, hash512, sizeof(hash512),
+				 data[i], strlen(data[i]),
+				 SHA512);
+	}
+
+	memset(input, 'a', sizeof(input));
+	/* cover critical input size around 112 bytes */
+	for (i = 110; i < sizeof(input); i++) {
+		err |= test_hash(sha384, hash384, sizeof(hash384),
+				 input, i, SHA384);
+		err |= test_hash(sha512, hash512, sizeof(hash512),
+				 input, i, SHA512);
+	}
+
+	return err;
+}
+#endif
diff --git a/lib/libtpm/sha_test.h b/lib/libtpm/sha_test.h
new file mode 100644
index 0000000..af82fac
--- /dev/null
+++ b/lib/libtpm/sha_test.h
@@ -0,0 +1,59 @@
+/*****************************************************************************
+ * Copyright (c) 2021 IBM Corporation
+ * All rights reserved.
+ * This program and the accompanying materials
+ * are made available under the terms of the BSD License
+ * which accompanies this distribution, and is available at
+ * http://www.opensource.org/licenses/bsd-license.php
+ *
+ * Contributors:
+ *     IBM Corporation - initial implementation
+ *****************************************************************************/
+
+#ifndef SHA_TEST_H
+#define SHA_TEST_H
+
+#include <stdio.h>
+
+#include "helpers.h"
+
+/* to avoid compilation issues do not include openssl/sha.h */
+unsigned char *SHA1(const unsigned char *, size_t, unsigned char *);
+unsigned char *SHA256(const unsigned char *, size_t, unsigned char *);
+unsigned char *SHA384(const unsigned char *, size_t, unsigned char *);
+unsigned char *SHA512(const unsigned char *, size_t, unsigned char *);
+
+typedef void (*hashfunc)(const uint8_t *data, uint32_t length, uint8_t *hash);
+typedef unsigned char *(*osslhashfunc)(const unsigned char *, size_t,
+				       unsigned char *);
+
+#define TESTVECTORS(NAME) \
+char *NAME[] = {	\
+	"",		\
+	"abc",		\
+	"abcdbcdecdefdefgefghfghighijhijkijkljklmklmnlmnomnopnopq", \
+	"abcdefghbcdefghicdefghijdefghijkefghijklfghijklmghijklmnhijklmnoijklmnopjklmnopqklmnopqrlmnopqrsmnopqrstnopqrstu" \
+};
+
+static inline int
+test_hash(hashfunc hf, uint8_t *hash, size_t hashlen,
+	   const char *data, uint32_t length,
+	   osslhashfunc osslhf)
+{
+	unsigned char expected[hashlen];
+	int ret = 0;
+
+	osslhf((const unsigned char *)data, length, expected);
+
+	hf((uint8_t *)data, length, hash);
+	if (!memcmp(hash, expected, hashlen)) {
+		printf("PASS: input length: %u\n", length);
+	} else {
+		printf("FAIL data: %s\n", data);
+		ret = 1;
+	}
+
+	return ret;
+}
+
+#endif /* SHA_TEST_H */
diff --git a/lib/libtpm/test.sh b/lib/libtpm/test.sh
new file mode 100755
index 0000000..4b0567a
--- /dev/null
+++ b/lib/libtpm/test.sh
@@ -0,0 +1,31 @@
+#!/usr/bin/env bash
+cd $(dirname "$0")
+
+CC=${HOSTCC:-gcc}
+CFLAGS="-Wall -Wextra -Werror -I../../include -I../../slof -I../../lib/libc/include -DMAIN"
+LDFLAGS="-lcrypto"
+
+function fail() {
+	rm -f ${EXEC}
+	echo "Test failed"
+	exit 1
+}
+
+function run_test() {
+	local msg="$1"
+	local src="$2"
+
+	EXEC="./${src%%.c}-test"
+
+	echo ${msg}
+	${CC} ${CFLAGS} ${src} -o ${EXEC} ${LDFLAGS} || exit 1
+	${EXEC} || fail
+	rm -f ${EXEC}
+}
+
+run_test "SHA-1 test:" sha.c
+run_test "SHA-256 test:" sha256.c
+run_test "SHA-384 & SHA-512 test:" sha512.c
+
+echo "All tests passed"
+exit 0
-- 
2.17.1