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/* Copyright (c) 2010 The Chromium OS Authors. All rights reserved.
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*
* Timing benchmark for verifying a firmware image.
*/
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include "cryptolib.h"
#include "file_keys.h"
#include "kernel_image.h"
#include "test_common.h"
#include "timer_utils.h"
#include "utility.h"
#define FILE_NAME_SIZE 128
#define NUM_OPERATIONS 30 /* Number of verify operations to time.
* We use a smaller number here (30 vs. 100)
* since there are many more cases to consider
* (one for each combination of firmware and kernel
* signature algorithm.
*/
#define KERNEL_SIZE_SMALL 512000
#define KERNEL_SIZE_MEDIUM 1024000
#define KERNEL_SIZE_LARGE 4096000
const uint64_t g_kernel_sizes_to_test[] = {
KERNEL_SIZE_SMALL,
KERNEL_SIZE_MEDIUM,
KERNEL_SIZE_LARGE
};
const char* g_kernel_size_labels[] = {
"small",
"medium",
"large"
};
#define NUM_SIZES_TO_TEST (sizeof(g_kernel_sizes_to_test) / \
sizeof(g_kernel_sizes_to_test[0]))
int SpeedTestAlgorithm(int firmware_sign_algorithm,
int kernel_sign_algorithm) {
int i, j, error_code = 0;
int firmware_key_size, kernel_key_size;
ClockTimerState ct;
double msecs;
uint64_t len;
uint8_t* kernel_sign_key = NULL;
uint8_t* firmware_key_blob = NULL;
char firmware_sign_key_file[FILE_NAME_SIZE];
char kernel_sign_key_file[FILE_NAME_SIZE];
char file_name[FILE_NAME_SIZE]; /* Temp to hold a constructed file name */
char* sha_strings[] = { /* Maps algorithm->SHA algorithm. */
"sha1", "sha256", "sha512", /* RSA-1024 */
"sha1", "sha256", "sha512", /* RSA-2048 */
"sha1", "sha256", "sha512", /* RSA-4096 */
"sha1", "sha256", "sha512", /* RSA-8192 */
};
uint8_t* kernel_blobs[NUM_SIZES_TO_TEST];
for (i = 0; i < NUM_SIZES_TO_TEST; ++i)
kernel_blobs[i] = NULL;
/* Get all needed test keys. */
firmware_key_size = siglen_map[firmware_sign_algorithm] * 8; /* in bits. */
kernel_key_size = siglen_map[kernel_sign_algorithm] * 8; /* in bits. */
snprintf(firmware_sign_key_file, FILE_NAME_SIZE, "testkeys/key_rsa%d.pem",
firmware_key_size);
snprintf(kernel_sign_key_file, FILE_NAME_SIZE, "testkeys/key_rsa%d.pem",
kernel_key_size);
snprintf(file_name, FILE_NAME_SIZE, "testkeys/key_rsa%d.keyb",
kernel_key_size);
kernel_sign_key = BufferFromFile(file_name, &len);
if (!kernel_sign_key) {
VBDEBUG(("Couldn't read pre-processed public kernel signing key.\n"));
error_code = 1;
goto cleanup;
}
/* Generate test images. */
for (i = 0; i < NUM_SIZES_TO_TEST; ++i) {
kernel_blobs[i] = GenerateTestKernelBlob(firmware_sign_algorithm,
kernel_sign_algorithm,
kernel_sign_key,
1, /* kernel key version. */
1, /* kernel version. */
g_kernel_sizes_to_test[i],
firmware_sign_key_file,
kernel_sign_key_file);
if (!kernel_blobs[i]) {
VBDEBUG(("Couldn't generate test firmware images.\n"));
error_code = 1;
goto cleanup;
}
}
/* Get pre-processed key used for verification. */
snprintf(file_name, FILE_NAME_SIZE, "testkeys/key_rsa%d.keyb",
firmware_key_size);
firmware_key_blob = BufferFromFile(file_name, &len);
if (!firmware_key_blob) {
VBDEBUG(("Couldn't read pre-processed firmware public key.\n"));
error_code = 1;
goto cleanup;
}
/* Now run the timing tests. */
for (i = 0; i < NUM_SIZES_TO_TEST; ++i) {
StartTimer(&ct);
for (j = 0; j < NUM_OPERATIONS; ++j) {
if (VERIFY_KERNEL_SUCCESS !=
VerifyKernel(firmware_key_blob, kernel_blobs[i], 0))
VBDEBUG(("Warning: Kernel Verification Failed.\n"));
}
StopTimer(&ct);
msecs = (float) GetDurationMsecs(&ct) / NUM_OPERATIONS;
fprintf(stderr,
"# Kernel (%s, Algo = %s / %s):"
"\t%.02f ms/verification\n",
g_kernel_size_labels[i],
algo_strings[firmware_sign_algorithm],
algo_strings[kernel_sign_algorithm],
msecs);
fprintf(stdout, "ms_kernel_%s_rsa%d_%s_rsa%d_%s:%.02f\n",
g_kernel_size_labels[i],
firmware_key_size,
sha_strings[firmware_sign_algorithm],
kernel_key_size,
sha_strings[kernel_sign_algorithm],
msecs);
}
cleanup:
for (i = 0; i < NUM_SIZES_TO_TEST; ++i)
Free(kernel_blobs[i]);
Free(firmware_key_blob);
Free(kernel_sign_key);
return error_code;
}
int main(int argc, char* argv[]) {
int i, j, error_code = 0;
for (i = 0; i < kNumAlgorithms; ++i) { /* Firmware Signing Algorithm. */
for (j = 0; j < kNumAlgorithms; ++j) { /* Kernel Signing Algorithm. */
/* Only measure if the kernel signing algorithm is weaker or equal to
* the firmware signing algorithm. */
if (siglen_map[j] > siglen_map[i])
continue;
if (siglen_map[j] == siglen_map[i] && hash_size_map[j] > hash_size_map[i])
continue;
if (0 != (error_code = SpeedTestAlgorithm(i, j)))
return error_code;
}
}
return 0;
}
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