/* SPDX-License-Identifier: GPL-2.0
*
* Copyright (C) 2022 Red Hat, Inc.
* Author: Vladis Dronov <[email protected]>
*/
#include <asm/elf.h>
#include <asm/uaccess.h>
#include <asm/smp.h>
#include <crypto/skcipher.h>
#include <crypto/akcipher.h>
#include <crypto/acompress.h>
#include <crypto/rng.h>
#include <crypto/drbg.h>
#include <crypto/kpp.h>
#include <crypto/internal/simd.h>
#include <crypto/chacha.h>
#include <crypto/aead.h>
#include <crypto/hash.h>
#include <linux/crypto.h>
#include <linux/debugfs.h>
#include <linux/delay.h>
#include <linux/err.h>
#include <linux/fs.h>
#include <linux/fips.h>
#include <linux/kernel.h>
#include <linux/kthread.h>
#include <linux/module.h>
#include <linux/sched.h>
#include <linux/scatterlist.h>
#include <linux/time.h>
#include <linux/vmalloc.h>
#include <linux/zlib.h>
#include <linux/once.h>
#include <linux/random.h>
#include <linux/slab.h>
#include <linux/string.h>
static unsigned int data_size __read_mostly = 256;
static unsigned int debug __read_mostly = 0;
/* tie all skcipher structures together */
struct skcipher_def {
struct scatterlist sginp, sgout;
struct crypto_skcipher *tfm;
struct skcipher_request *req;
struct crypto_wait wait;
};
/* Perform cipher operations with the chacha lib */
static int test_lib_chacha(u8 *revert, u8 *cipher, u8 *plain)
{
u32 chacha_state[CHACHA_STATE_WORDS];
u8 iv[16], key[32];
u64 start, end;
memset(key, 'X', sizeof(key));
memset(iv, 'I', sizeof(iv));
if (debug) {
print_hex_dump(KERN_INFO, "key: ", DUMP_PREFIX_OFFSET,
16, 1, key, 32, 1);
print_hex_dump(KERN_INFO, "iv: ", DUMP_PREFIX_OFFSET,
16, 1, iv, 16, 1);
}
/* Encrypt */
chacha_init_arch(chacha_state, (u32*)key, iv);
start = ktime_get_ns();
chacha_crypt_arch(chacha_state, cipher, plain, data_size, 20);
end = ktime_get_ns();
if (debug)
print_hex_dump(KERN_INFO, "encr:", DUMP_PREFIX_OFFSET,
16, 1, cipher,
(data_size > 64 ? 64 : data_size), 1);
pr_info("lib encryption took: %lld nsec", end - start);
/* Decrypt */
chacha_init_arch(chacha_state, (u32 *)key, iv);
start = ktime_get_ns();
chacha_crypt_arch(chacha_state, revert, cipher, data_size, 20);
end = ktime_get_ns();
if (debug)
print_hex_dump(KERN_INFO, "decr:", DUMP_PREFIX_OFFSET,
16, 1, revert,
(data_size > 64 ? 64 : data_size), 1);
pr_info("lib decryption took: %lld nsec", end - start);
return 0;
}
/* Perform cipher operations with skcipher */
static unsigned int test_skcipher_encdec(struct skcipher_def *sk,
int enc)
{
int rc;
if (enc) {
rc = crypto_wait_req(crypto_skcipher_encrypt(sk->req),
&sk->wait);
if (rc)
pr_info("skcipher encrypt returned with result"
"%d\n", rc);
}
else
{
rc = crypto_wait_req(crypto_skcipher_decrypt(sk->req),
&sk->wait);
if (rc)
pr_info("skcipher decrypt returned with result"
"%d\n", rc);
}
return rc;
}
/* Initialize and trigger cipher operations */
static int test_skcipher(char *name, u8 *revert, u8 *cipher, u8 *plain)
{
struct skcipher_def sk;
struct crypto_skcipher *skcipher = NULL;
struct skcipher_request *req = NULL;
u8 iv[16], key[32];
u64 start, end;
int ret = -EFAULT;
skcipher = crypto_alloc_skcipher(name, 0, 0);
if (IS_ERR(skcipher)) {
pr_info("could not allocate skcipher %s handle\n", name);
return PTR_ERR(skcipher);
}
req = skcipher_request_alloc(skcipher, GFP_KERNEL);
if (!req) {
pr_info("could not allocate skcipher request\n");
ret = -ENOMEM;
goto out;
}
skcipher_request_set_callback(req, CRYPTO_TFM_REQ_MAY_BACKLOG,
crypto_req_done,
&sk.wait);
memset(key, 'X', sizeof(key));
memset(iv, 'I', sizeof(iv));
if (crypto_skcipher_setkey(skcipher, key, 32)) {
pr_info("key could not be set\n");
ret = -EAGAIN;
goto out;
}
if (debug) {
print_hex_dump(KERN_INFO, "key: ", DUMP_PREFIX_OFFSET,
16, 1, key, 32, 1);
print_hex_dump(KERN_INFO, "iv: ", DUMP_PREFIX_OFFSET,
16, 1, iv, 16, 1);
}
sk.tfm = skcipher;
sk.req = req;
/* Encrypt in one pass */
sg_init_one(&sk.sginp, plain, data_size);
sg_init_one(&sk.sgout, cipher, data_size);
skcipher_request_set_crypt(req, &sk.sginp, &sk.sgout,
data_size, iv);
crypto_init_wait(&sk.wait);
/* Encrypt data */
start = ktime_get_ns();
ret = test_skcipher_encdec(&sk, 1);
end = ktime_get_ns();
if (ret)
goto out;
pr_info("%s tfm encryption successful, took %lld nsec\n", name, end - start);
if (debug)
print_hex_dump(KERN_INFO, "encr:", DUMP_PREFIX_OFFSET,
16, 1, cipher,
(data_size > 64 ? 64 : data_size), 1);
/* Prepare for decryption */
memset(iv, 'I', sizeof(iv));
sg_init_one(&sk.sginp, cipher, data_size);
sg_init_one(&sk.sgout, revert, data_size);
skcipher_request_set_crypt(req, &sk.sginp, &sk.sgout,
data_size, iv);
crypto_init_wait(&sk.wait);
/* Decrypt data */
start = ktime_get_ns();
ret = test_skcipher_encdec(&sk, 0);
end = ktime_get_ns();
if (ret)
goto out;
pr_info("%s tfm decryption successful, took %lld nsec\n", name, end - start);
if (debug)
print_hex_dump(KERN_INFO, "decr:", DUMP_PREFIX_OFFSET,
16, 1, revert,
(data_size > 64 ? 64 : data_size), 1);
/* Dump some internal skcipher data */
if (debug)
pr_info("skcipher %s: cryptlen %d blksize %d stride %d "
"ivsize %d alignmask 0x%x\n",
name, sk.req->cryptlen,
crypto_skcipher_blocksize(sk.tfm),
crypto_skcipher_alg(sk.tfm)->walksize,
crypto_skcipher_ivsize(sk.tfm),
crypto_skcipher_alignmask(sk.tfm));
out:
if (skcipher)
crypto_free_skcipher(skcipher);
if (req)
skcipher_request_free(req);
return ret;
}
static int __init chacha_s390_test_init(void)
{
u8 *plain = NULL, *revert = NULL;
u8 *cipher_generic = NULL, *cipher_s390 = NULL;
int ret = -1;
pr_info("s390 ChaCha20 test module: size=%d debug=%d\n",
data_size, debug);
/* Allocate and fill buffers */
plain = vmalloc(data_size);
if (!plain) {
pr_info("could not allocate plain buffer\n");
ret = -2;
goto out;
}
memset(plain, 'a', data_size);
get_random_bytes(plain, (data_size > 256 ? 256 : data_size));
cipher_generic = vzalloc(data_size);
if (!cipher_generic) {
pr_info("could not allocate cipher_generic buffer\n");
ret = -2;
goto out;
}
cipher_s390 = vzalloc(data_size);
if (!cipher_s390) {
pr_info("could not allocate cipher_s390 buffer\n");
ret = -2;
goto out;
}
revert = vzalloc(data_size);
if (!revert) {
pr_info("could not allocate revert buffer\n");
ret = -2;
goto out;
}
if (debug)
print_hex_dump(KERN_INFO, "src: ", DUMP_PREFIX_OFFSET,
16, 1, plain,
(data_size > 64 ? 64 : data_size), 1);
/* Use chacha20 generic */
ret = test_skcipher("chacha20-generic", revert, cipher_generic, plain);
if (ret)
goto out;
if (memcmp(plain, revert, data_size)) {
pr_info("generic en/decryption check FAILED\n");
ret = -2;
goto out;
}
else
pr_info("generic en/decryption check OK\n");
memset(revert, 0, data_size);
/* Use chacha20 s390 */
ret = test_skcipher("chacha20-s390", revert, cipher_s390, plain);
if (ret)
goto out;
if (memcmp(plain, revert, data_size)) {
pr_info("s390 en/decryption check FAILED\n");
ret = -2;
goto out;
}
else
pr_info("s390 en/decryption check OK\n");
if (memcmp(cipher_generic, cipher_s390, data_size)) {
pr_info("s390 vs generic check FAILED\n");
ret = -2;
goto out;
}
else
pr_info("s390 vs generic check OK\n");
memset(cipher_s390, 0, data_size);
memset(revert, 0, data_size);
/* Use chacha20 lib */
test_lib_chacha(revert, cipher_s390, plain);
if (memcmp(plain, revert, data_size)) {
pr_info("lib en/decryption check FAILED\n");
ret = -2;
goto out;
}
else
pr_info("lib en/decryption check OK\n");
if (memcmp(cipher_generic, cipher_s390, data_size)) {
pr_info("lib vs generic check FAILED\n");
ret = -2;
goto out;
}
else
pr_info("lib vs generic check OK\n");
pr_info("--- chacha20 s390 test end ---\n");
out:
if (plain)
vfree(plain);
if (cipher_generic)
vfree(cipher_generic);
if (cipher_s390)
vfree(cipher_s390);
if (revert)
vfree(revert);
return -1;
}
static void __exit chacha_s390_test_exit(void)
{
pr_info("s390 ChaCha20 test module exit\n");
}
module_param_named(size, data_size, uint, 0660);
module_param(debug, int, 0660);
MODULE_PARM_DESC(size, "Size of a plaintext");
MODULE_PARM_DESC(debug, "Debug level (0=off,1=on)");
module_init(chacha_s390_test_init);
module_exit(chacha_s390_test_exit);
MODULE_DESCRIPTION("s390 ChaCha20 self-test");
MODULE_AUTHOR("Vladis Dronov <[email protected]>");
MODULE_LICENSE("GPL v2");
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