// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * KUnit test suite for AES-CCM
 *
 * Copyright 2026 Google LLC
 */
#include <crypto/aes-ccm.h>
#include <crypto/blake2s.h>
#include "test-utils.h"

/* AES-CCM test vectors from external sources */
static const struct aes_ccm_testvec {
	const char *name;
	const char *key;
	size_t key_len;
	const char *nonce;
	size_t nonce_len;
	const char *ad;
	size_t ad_len;
	const char *ptext;
	const char *ctext;
	size_t data_len;
	const char *tag;
	size_t tag_len;
} aes_ccm_testvecs[] = {
	{
		.name = "RFC 3610 Packet Vector #1",
		.key = "\xc0\xc1\xc2\xc3\xc4\xc5\xc6\xc7"
		       "\xc8\xc9\xca\xcb\xcc\xcd\xce\xcf",
		.key_len = 16,
		.nonce = "\x00\x00\x00\x03\x02\x01\x00\xa0"
			 "\xa1\xa2\xa3\xa4\xa5",
		.nonce_len = 13,
		.ad = "\x00\x01\x02\x03\x04\x05\x06\x07",
		.ad_len = 8,
		.ptext = "\x08\x09\x0a\x0b\x0c\x0d\x0e\x0f"
			 "\x10\x11\x12\x13\x14\x15\x16\x17"
			 "\x18\x19\x1a\x1b\x1c\x1d\x1e",
		.ctext = "\x58\x8c\x97\x9a\x61\xc6\x63\xd2"
			 "\xf0\x66\xd0\xc2\xc0\xf9\x89\x80"
			 "\x6d\x5f\x6b\x61\xda\xc3\x84",
		.data_len = 23,
		.tag = "\x17\xe8\xd1\x2c\xfd\xf9\x26\xe0",
		.tag_len = 8,
	},
	{
		.name = "RFC 3610 Packet Vector #5",
		.key = "\xc0\xc1\xc2\xc3\xc4\xc5\xc6\xc7"
		       "\xc8\xc9\xca\xcb\xcc\xcd\xce\xcf",
		.key_len = 16,
		.nonce = "\x00\x00\x00\x07\x06\x05\x04\xa0"
			 "\xa1\xa2\xa3\xa4\xa5",
		.nonce_len = 13,
		.ad = "\x00\x01\x02\x03\x04\x05\x06\x07"
		      "\x08\x09\x0a\x0b",
		.ad_len = 12,
		.ptext = "\x0c\x0d\x0e\x0f\x10\x11\x12\x13"
			 "\x14\x15\x16\x17\x18\x19\x1a\x1b"
			 "\x1c\x1d\x1e\x1f",
		.ctext = "\xdc\xf1\xfb\x7b\x5d\x9e\x23\xfb"
			 "\x9d\x4e\x13\x12\x53\x65\x8a\xd8"
			 "\x6e\xbd\xca\x3e",
		.data_len = 20,
		.tag = "\x51\xe8\x3f\x07\x7d\x9c\x2d\x93",
		.tag_len = 8,
	},
	{
		.name = "RFC 3610 Packet Vector #9",
		.key = "\xc0\xc1\xc2\xc3\xc4\xc5\xc6\xc7"
		       "\xc8\xc9\xca\xcb\xcc\xcd\xce\xcf",
		.key_len = 16,
		.nonce = "\x00\x00\x00\x0b\x0a\x09\x08\xa0"
			 "\xa1\xa2\xa3\xa4\xa5",
		.nonce_len = 13,
		.ad = "\x00\x01\x02\x03\x04\x05\x06\x07",
		.ad_len = 8,
		.ptext = "\x08\x09\x0a\x0b\x0c\x0d\x0e\x0f"
			 "\x10\x11\x12\x13\x14\x15\x16\x17"
			 "\x18\x19\x1a\x1b\x1c\x1d\x1e\x1f"
			 "\x20",
		.ctext = "\x82\x53\x1a\x60\xcc\x24\x94\x5a"
			 "\x4b\x82\x79\x18\x1a\xb5\xc8\x4d"
			 "\xf2\x1c\xe7\xf9\xb7\x3f\x42\xe1"
			 "\x97",
		.data_len = 25,
		.tag = "\xea\x9c\x07\xe5\x6b\x5e\xb1\x7e"
		       "\x5f\x4e",
		.tag_len = 10,
	},
	{
		.name = "NIST SP 800-38C Example 1",
		.key = "\x40\x41\x42\x43\x44\x45\x46\x47"
		       "\x48\x49\x4a\x4b\x4c\x4d\x4e\x4f",
		.key_len = 16,
		.nonce = "\x10\x11\x12\x13\x14\x15\x16",
		.nonce_len = 7,
		.ad = "\x00\x01\x02\x03\x04\x05\x06\x07",
		.ad_len = 8,
		.ptext = "\x20\x21\x22\x23",
		.ctext = "\x71\x62\x01\x5b",
		.data_len = 4,
		.tag = "\x4d\xac\x25\x5d",
		.tag_len = 4,
	},
	{
		.name = "NIST SP 800-38C Example 2",
		.key = "\x40\x41\x42\x43\x44\x45\x46\x47"
		       "\x48\x49\x4a\x4b\x4c\x4d\x4e\x4f",
		.key_len = 16,
		.nonce = "\x10\x11\x12\x13\x14\x15\x16\x17",
		.nonce_len = 8,
		.ad = "\x00\x01\x02\x03\x04\x05\x06\x07"
		      "\x08\x09\x0a\x0b\x0c\x0d\x0e\x0f",
		.ad_len = 16,
		.ptext = "\x20\x21\x22\x23\x24\x25\x26\x27"
			 "\x28\x29\x2a\x2b\x2c\x2d\x2e\x2f",
		.ctext = "\xd2\xa1\xf0\xe0\x51\xea\x5f\x62"
			 "\x08\x1a\x77\x92\x07\x3d\x59\x3d",
		.data_len = 16,
		.tag = "\x1f\xc6\x4f\xbf\xac\xcd",
		.tag_len = 6,
	},
	{
		.name = "NIST SP 800-38C Example 3",
		.key = "\x40\x41\x42\x43\x44\x45\x46\x47"
		       "\x48\x49\x4a\x4b\x4c\x4d\x4e\x4f",
		.key_len = 16,
		.nonce = "\x10\x11\x12\x13\x14\x15\x16\x17"
			 "\x18\x19\x1a\x1b",
		.nonce_len = 12,
		.ad = "\x00\x01\x02\x03\x04\x05\x06\x07"
		      "\x08\x09\x0a\x0b\x0c\x0d\x0e\x0f"
		      "\x10\x11\x12\x13",
		.ad_len = 20,
		.ptext = "\x20\x21\x22\x23\x24\x25\x26\x27"
			 "\x28\x29\x2a\x2b\x2c\x2d\x2e\x2f"
			 "\x30\x31\x32\x33\x34\x35\x36\x37",
		.ctext = "\xe3\xb2\x01\xa9\xf5\xb7\x1a\x7a"
			 "\x9b\x1c\xea\xec\xcd\x97\xe7\x0b"
			 "\x61\x76\xaa\xd9\xa4\x42\x8a\xa5",
		.data_len = 24,
		.tag = "\x48\x43\x92\xfb\xc1\xb0\x99\x51",
		.tag_len = 8,
	},
};

static void test_aes_ccm_one_test_vector(struct kunit *test,
					 const struct aes_ccm_testvec *tv)
{
	u8 *ctext = alloc_buf(test, tv->data_len);
	u8 *decrypted = alloc_buf(test, tv->data_len);
	u8 *tag = alloc_buf(test, tv->tag_len);
	struct aes_ccm_key key;
	int err;

	err = aes_ccm_preparekey(&key, tv->key, tv->key_len, tv->tag_len);
	KUNIT_ASSERT_EQ_MSG(test, 0, err, "Failed to prepare key for %s",
			    tv->name);

	err = aes_ccm_encrypt(ctext, tv->ptext, tv->data_len, tag, tv->ad,
			      tv->ad_len, tv->nonce, tv->nonce_len, &key);
	KUNIT_ASSERT_EQ_MSG(test, 0, err, "Encryption failed for %s", tv->name);
	KUNIT_ASSERT_MEMEQ_MSG(test, tv->ctext, ctext, tv->data_len,
			       "Wrong ciphertext for %s", tv->name);
	KUNIT_ASSERT_MEMEQ_MSG(test, tag, tv->tag, tv->tag_len,
			       "Wrong tag for %s", tv->name);

	err = aes_ccm_decrypt(decrypted, ctext, tv->data_len, tag, tv->ad,
			      tv->ad_len, tv->nonce, tv->nonce_len, &key);
	KUNIT_ASSERT_EQ_MSG(test, 0, err, "Decryption failed for %s", tv->name);
	KUNIT_ASSERT_MEMEQ_MSG(test, tv->ptext, decrypted, tv->data_len,
			       "Wrong plaintext for %s", tv->name);
}

static void test_aes_ccm_test_vectors(struct kunit *test)
{
	for (size_t i = 0; i < ARRAY_SIZE(aes_ccm_testvecs); i++)
		test_aes_ccm_one_test_vector(test, &aes_ccm_testvecs[i]);
}

/*
 * Test NIST SP 800-38C Example 4, which uses a deterministically-generated
 * 65536-byte associated data string.
 */
static void test_aes_ccm_nist_sp800_38c_example4(struct kunit *test)
{
	struct aes_ccm_testvec tv = {
		.name = "NIST SP 800-38C Example 4",
		.key_len = 16,
		.nonce_len = 13,
		.ad_len = 65536,
		.ctext = "\x69\x91\x5d\xad\x1e\x84\xc6\x37"
			 "\x6a\x68\xc2\x96\x7e\x4d\xab\x61"
			 "\x5a\xe0\xfd\x1f\xae\xc4\x4c\xc4"
			 "\x84\x82\x85\x29\x46\x3c\xcf\x72",
		.data_len = 32,
		.tag = "\xb4\xac\x6b\xec\x93\xe8\x59\x8e"
		       "\x7f\x0d\xad\xbc\xea\x5b",
		.tag_len = 14,
	};
	u8 *key, *nonce, *ad, *ptext;

	key = alloc_buf(test, tv.key_len);
	for (size_t i = 0; i < tv.key_len; i++)
		key[i] = 0x40 + i;

	nonce = alloc_guarded_buf(test, tv.nonce_len);
	for (size_t i = 0; i < tv.nonce_len; i++)
		nonce[i] = 0x10 + i;

	ad = alloc_guarded_buf(test, tv.ad_len);
	for (size_t i = 0; i < tv.ad_len; i++)
		ad[i] = (u8)i;

	ptext = alloc_guarded_buf(test, tv.data_len);
	for (size_t i = 0; i < tv.data_len; i++)
		ptext[i] = 0x20 + i;

	tv.key = key;
	tv.nonce = nonce;
	tv.ad = ad;
	tv.ptext = ptext;

	test_aes_ccm_one_test_vector(test, &tv);
}

static const size_t aes_ccm_valid_key_lens[] = { 16, 24, 32 };
#define AEAD_MAX_KEY_LEN 32
#define AEAD_VALID_KEY_LENS aes_ccm_valid_key_lens

static const size_t aes_ccm_valid_nonce_lens[] = { 7, 8, 9, 10, 11, 12, 13 };
#define AEAD_MAX_NONCE_LEN 13
#define AEAD_VALID_NONCE_LENS aes_ccm_valid_nonce_lens

static const size_t aes_ccm_valid_tag_lens[] = { 4, 6, 8, 10, 12, 14, 16 };
#define AEAD_MAX_TAG_LEN 16
#define AEAD_VALID_TAG_LENS aes_ccm_valid_tag_lens

#define AEAD_KEY aes_ccm_key
#define AEAD_CTX aes_ccm_ctx
#define AEAD_PREPAREKEY aes_ccm_preparekey
#define AEAD_ENCRYPT aes_ccm_encrypt
#define AEAD_DECRYPT aes_ccm_decrypt

#define AEAD_INIT aes_ccm_init
#define AEAD_AUTH_UPDATE aes_ccm_auth_update
#define AEAD_ENCRYPT_UPDATE aes_ccm_encrypt_update
#define AEAD_DECRYPT_UPDATE aes_ccm_decrypt_update
#define AEAD_ENCRYPT_FINAL aes_ccm_encrypt_final
#define AEAD_DECRYPT_FINAL aes_ccm_decrypt_final

/* This value was generated by gen-aead-testvecs.py. */
static const u8 aes_ccm_monte_carlo_checksum[BLAKE2S_HASH_SIZE] = {
	0x70, 0x1c, 0xde, 0xa4, 0xe2, 0x03, 0x50, 0xb2, 0xf5, 0x9e, 0x61,
	0x66, 0xe4, 0xe5, 0x13, 0x1a, 0x00, 0x95, 0x34, 0x03, 0xb7, 0x61,
	0x2c, 0xdb, 0xc3, 0x15, 0x36, 0x84, 0x93, 0x7f, 0xb4, 0x5b,
};
#define AEAD_MONTE_CARLO_CHECKSUM aes_ccm_monte_carlo_checksum

#include "aead-test-template.h"

/*
 * Test that for each AES-CCM nonce length, the message length is validated
 * against the correct corresponding maximum message length.
 */
static void test_aes_ccm_data_len_too_large(struct kunit *test)
{
	static const struct {
		size_t nonce_len;
		u64 max_data_len;
	} lens[] = {
		/* clang-format off */
		{ 7, 0xffffffffffffffff }, /* U64_MAX */
		{ 8, 0xffffffffffffff },
		{ 9, 0xffffffffffff },
		{ 10, 0xffffffffff },
		{ 11, 0xffffffff },
		{ 12, 0xffffff },
		{ 13, 0xffff },
		/* clang-format on */
	};
	u8 nonce[13] = {};
	u8 raw_key[AES_KEYSIZE_256] = {};
	int err;
	struct aes_ccm_key *key = alloc_buf(test, sizeof(*key));
	struct aes_ccm_ctx ctx;

	err = aes_ccm_preparekey(key, raw_key, sizeof(raw_key), 16);
	KUNIT_ASSERT_EQ(test, 0, err);

	for (size_t i = 0; i < ARRAY_SIZE(lens); i++) {
		size_t nonce_len = lens[i].nonce_len;
		u64 max_data_len = lens[i].max_data_len;

		/* data_len <= max_data_len should be accepted. */
		err = aes_ccm_init(&ctx, 0, 0, nonce, nonce_len, key);
		KUNIT_ASSERT_EQ_MSG(
			test, 0, err,
			"data_len=0 wasn't accepted with nonce_len=%zu",
			nonce_len);
		err = aes_ccm_init(&ctx, max_data_len, 0, nonce, nonce_len,
				   key);
		KUNIT_ASSERT_EQ_MSG(
			test, 0, err,
			"data_len=%llu wasn't accepted with nonce_len=%zu",
			max_data_len, nonce_len);

		/* data_len > max_data_len should be rejected. */
		if (max_data_len == U64_MAX)
			continue;
		err = aes_ccm_init(&ctx, max_data_len + 1, 0, nonce, nonce_len,
				   key);
		KUNIT_ASSERT_EQ_MSG(
			test, -EOVERFLOW, err,
			"data_len=%llu wasn't rejected with -EOVERFLOW with nonce_len=%zu (aes_ccm_init)",
			max_data_len + 1, nonce_len);
		if (max_data_len + 1 <= SIZE_MAX) {
			err = aes_ccm_encrypt(NULL, NULL, max_data_len + 1,
					      NULL, NULL, 0, nonce, nonce_len,
					      key);
			KUNIT_ASSERT_EQ_MSG(
				test, -EOVERFLOW, err,
				"data_len=%llu wasn't rejected with -EOVERFLOW with nonce_len=%zu (aes_ccm_encrypt)",
				max_data_len + 1, nonce_len);
			err = aes_ccm_decrypt(NULL, NULL, max_data_len + 1,
					      NULL, NULL, 0, nonce, nonce_len,
					      key);
			KUNIT_ASSERT_EQ_MSG(
				test, -EOVERFLOW, err,
				"data_len=%llu wasn't rejected with -EOVERFLOW with nonce_len=%zu (aes_ccm_decrypt)",
				max_data_len + 1, nonce_len);
		}
		err = aes_ccm_init(&ctx, U64_MAX, 0, nonce, nonce_len, key);
		KUNIT_ASSERT_EQ_MSG(
			test, -EOVERFLOW, err,
			"data_len=U64_MAX wasn't rejected with -EOVERFLOW with nonce_len=%zu (aes_ccm_init)",
			nonce_len);
	}
}

static struct kunit_case aes_ccm_test_cases[] = {
	KUNIT_CASE(test_aes_ccm_test_vectors),
	KUNIT_CASE(test_aes_ccm_nist_sp800_38c_example4),
	KUNIT_CASE(test_aes_ccm_data_len_too_large),
	AEAD_KUNIT_CASES,
	{},
};

static struct kunit_suite aes_ccm_test_suite = {
	.name = "aes_ccm",
	.test_cases = aes_ccm_test_cases,
};
kunit_test_suite(aes_ccm_test_suite);

MODULE_DESCRIPTION("KUnit tests and benchmark for AES-CCM");
MODULE_LICENSE("GPL");