/* Copyright (c) 2013 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.
 *
 * Tests for firmware image library.
 */

#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#include "cryptolib.h"
#include "file_keys.h"
#include "host_common.h"
#include "test_common.h"
#include "vboot_common.h"

static void VerifyPublicKeyToRSA(const VbPublicKey *orig_key)
{
	RSAPublicKey *rsa;
	VbPublicKey *key = PublicKeyAlloc(orig_key->key_size, 0, 0);

	PublicKeyCopy(key, orig_key);
	key->algorithm = kNumAlgorithms;
	TEST_EQ((size_t)PublicKeyToRSA(key), 0,
		"PublicKeyToRSA() invalid algorithm");

	PublicKeyCopy(key, orig_key);
	key->key_size -= 1;
	TEST_EQ((size_t)PublicKeyToRSA(key), 0,
		"PublicKeyToRSA() invalid size");

	rsa = PublicKeyToRSA(orig_key);
	TEST_NEQ((size_t)rsa, 0, "PublicKeyToRSA() ok");
	if (rsa) {
		TEST_EQ((int)rsa->algorithm, (int)key->algorithm,
			"PublicKeyToRSA() algorithm");
		RSAPublicKeyFree(rsa);
	}
}

static void VerifyDataTest(const VbPublicKey *public_key,
                           const VbPrivateKey *private_key)
{
	const uint8_t test_data[] = "This is some test data to sign.";
	const uint64_t test_size = sizeof(test_data);
	VbSignature *sig;
	RSAPublicKey *rsa;

	sig = CalculateSignature(test_data, test_size, private_key);
	TEST_PTR_NEQ(sig, 0, "VerifyData() calculate signature");

	rsa = PublicKeyToRSA(public_key);
	TEST_PTR_NEQ(rsa, 0, "VerifyData() calculate rsa");

	if (!sig || !rsa)
		return;

	TEST_EQ(VerifyData(test_data, test_size, sig, rsa), 0,
		"VerifyData() ok");

	sig->sig_size -= 16;
	TEST_EQ(VerifyData(test_data, test_size, sig, rsa), 1,
		"VerifyData() wrong sig size");
	sig->sig_size += 16;

	TEST_EQ(VerifyData(test_data, test_size - 1, sig, rsa), 1,
		"VerifyData() input buffer too small");

	GetSignatureData(sig)[0] ^= 0x5A;
	TEST_EQ(VerifyData(test_data, test_size, sig, rsa), 1,
		"VerifyData() wrong sig");

	RSAPublicKeyFree(rsa);
	free(sig);
}

static void VerifyDigestTest(const VbPublicKey *public_key,
                             const VbPrivateKey *private_key)
{
	const uint8_t test_data[] = "This is some other test data to sign.";
	VbSignature *sig;
	RSAPublicKey *rsa;
	uint8_t *digest;

	sig = CalculateSignature(test_data, sizeof(test_data), private_key);
	rsa = PublicKeyToRSA(public_key);
	digest = DigestBuf(test_data, sizeof(test_data),
			   (int)public_key->algorithm);
	TEST_NEQ(sig && rsa && digest, 0, "VerifyData() prerequisites");
	if (!sig || !rsa || !digest)
		return;

	TEST_EQ(VerifyDigest(digest, sig, rsa), 0, "VerifyDigest() ok");

	GetSignatureData(sig)[0] ^= 0x5A;
	TEST_EQ(VerifyDigest(digest, sig, rsa), 1, "VerifyDigest() wrong sig");

	sig->sig_size = 1;
	TEST_EQ(VerifyDigest(digest, sig, rsa), 1, "VerifyDigest() sig size");

	RSAPublicKeyFree(rsa);
	free(sig);
	free(digest);
}

static void ReSignKernelPreamble(VbKernelPreambleHeader *h,
                                 const VbPrivateKey *key)
{
	VbSignature *sig = CalculateSignature((const uint8_t *)h,
			h->preamble_signature.data_size, key);

	SignatureCopy(&h->preamble_signature, sig);
	free(sig);
}

static void VerifyKernelPreambleTest(const VbPublicKey *public_key,
                                     const VbPrivateKey *private_key)
{
	VbKernelPreambleHeader *hdr;
	VbKernelPreambleHeader *h;
	RSAPublicKey *rsa;
	unsigned hsize;

	/* Create a dummy signature */
	VbSignature *body_sig = SignatureAlloc(56, 78);

	rsa = PublicKeyToRSA(public_key);
	hdr = CreateKernelPreamble(0x1234, 0x100000, 0x300000, 0x4000, body_sig,
				   0, private_key);
	TEST_NEQ(hdr && rsa, 0, "VerifyKernelPreamble() prerequisites");
	if (!hdr)
		return;
	hsize = (unsigned) hdr->preamble_size;
	h = (VbKernelPreambleHeader *)malloc(hsize + 16384);

	TEST_EQ(VerifyKernelPreamble(hdr, hsize, rsa), 0,
		"VerifyKernelPreamble() ok using key");
	TEST_NEQ(VerifyKernelPreamble(hdr, hsize - 1, rsa), 0,
		 "VerifyKernelPreamble() size--");
	TEST_NEQ(VerifyKernelPreamble(hdr, 4, rsa), 0,
		 "VerifyKernelPreamble() size tiny");
	TEST_EQ(VerifyKernelPreamble(hdr, hsize + 1, rsa), 0,
		"VerifyKernelPreamble() size++");

	/* Care about major version but not minor */
	Memcpy(h, hdr, hsize);
	h->header_version_major++;
	ReSignKernelPreamble(h, private_key);
	TEST_NEQ(VerifyKernelPreamble(h, hsize, rsa), 0,
		 "VerifyKernelPreamble() major++");

	Memcpy(h, hdr, hsize);
	h->header_version_major--;
	ReSignKernelPreamble(h, private_key);
	TEST_NEQ(VerifyKernelPreamble(h, hsize, rsa), 0,
		 "VerifyKernelPreamble() major--");

	Memcpy(h, hdr, hsize);
	h->header_version_minor++;
	ReSignKernelPreamble(h, private_key);
	TEST_EQ(VerifyKernelPreamble(h, hsize, rsa), 0,
		"VerifyKernelPreamble() minor++");

	Memcpy(h, hdr, hsize);
	h->header_version_minor--;
	ReSignKernelPreamble(h, private_key);
	TEST_EQ(VerifyKernelPreamble(h, hsize, rsa), 0,
		"VerifyKernelPreamble() minor--");

	/* Check signature */
	Memcpy(h, hdr, hsize);
	h->preamble_signature.sig_offset = hsize;
	ReSignKernelPreamble(h, private_key);
	TEST_NEQ(VerifyKernelPreamble(h, hsize, rsa), 0,
		 "VerifyKernelPreamble() sig off end");

	Memcpy(h, hdr, hsize);
	h->preamble_signature.sig_size--;
	ReSignKernelPreamble(h, private_key);
	TEST_NEQ(VerifyKernelPreamble(h, hsize, rsa), 0,
		 "VerifyKernelPreamble() sig too small");

	Memcpy(h, hdr, hsize);
	GetSignatureData(&h->body_signature)[0] ^= 0x34;
	TEST_NEQ(VerifyKernelPreamble(h, hsize, rsa), 0,
		 "VerifyKernelPreamble() sig mismatch");

	/* Check that we signed header and body sig */
	Memcpy(h, hdr, hsize);
	h->preamble_signature.data_size = 4;
	h->body_signature.sig_offset = 0;
	h->body_signature.sig_size = 0;
	ReSignKernelPreamble(h, private_key);
	TEST_NEQ(VerifyKernelPreamble(h, hsize, rsa), 0,
		 "VerifyKernelPreamble() didn't sign header");

	Memcpy(h, hdr, hsize);
	h->body_signature.sig_offset = hsize;
	ReSignKernelPreamble(h, private_key);
	TEST_NEQ(VerifyKernelPreamble(h, hsize, rsa), 0,
		 "VerifyKernelPreamble() body sig off end");

	/* TODO: verify parser can support a bigger header. */

	free(h);
	RSAPublicKeyFree(rsa);
	free(hdr);
}

int test_algorithm(int key_algorithm, const char *keys_dir)
{
	char filename[1024];
	int rsa_len = siglen_map[key_algorithm] * 8;

	VbPrivateKey *private_key = NULL;
	VbPublicKey *public_key = NULL;

	printf("***Testing algorithm: %s\n", algo_strings[key_algorithm]);

	sprintf(filename, "%s/key_rsa%d.pem", keys_dir, rsa_len);
	private_key = PrivateKeyReadPem(filename, key_algorithm);
	if (!private_key) {
		fprintf(stderr, "Error reading private_key: %s\n", filename);
		return 1;
	}

	sprintf(filename, "%s/key_rsa%d.keyb", keys_dir, rsa_len);
	public_key = PublicKeyReadKeyb(filename, key_algorithm, 1);
	if (!public_key) {
		fprintf(stderr, "Error reading public_key: %s\n", filename);
		return 1;
	}

	VerifyPublicKeyToRSA(public_key);
	VerifyDataTest(public_key, private_key);
	VerifyDigestTest(public_key, private_key);
	VerifyKernelPreambleTest(public_key, private_key);

	if (public_key)
		free(public_key);
	if (private_key)
		free(private_key);

	return 0;
}

/*
 * Test only the algorithms we use:
 * 4 (rsa2048 sha256)
 * 7 (rsa4096 sha256)
 * 11 (rsa8192 sha512)
 */
const int key_algs[] = {4, 7, 11};

int main(int argc, char *argv[]) {
	if (argc == 2) {
		int i;

		for (i = 0; i < ARRAY_SIZE(key_algs); i++) {
			if (test_algorithm(key_algs[i], argv[1]))
				return 1;
		}

	} else if (argc == 3 && !strcasecmp(argv[2], "--all")) {
		/* Test all the algorithms */
		int alg;

		for (alg = 0; alg < kNumAlgorithms; alg++) {
			if (test_algorithm(alg, argv[1]))
				return 1;
		}

	} else {
		fprintf(stderr, "Usage: %s <keys_dir> [--all]", argv[0]);
		return -1;
	}

	return gTestSuccess ? 0 : 255;
}