Release 4.18 crypto/crc32_generic.c
/* GPL HEADER START
*
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 only,
* as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License version 2 for more details (a copy is included
* in the LICENSE file that accompanied this code).
*
* You should have received a copy of the GNU General Public License
* version 2 along with this program; If not, see http://www.gnu.org/licenses
*
* Please visit http://www.xyratex.com/contact if you need additional
* information or have any questions.
*
* GPL HEADER END
*/
/*
* Copyright 2012 Xyratex Technology Limited
*/
/*
* This is crypto api shash wrappers to crc32_le.
*/
#include <asm/unaligned.h>
#include <linux/crc32.h>
#include <crypto/internal/hash.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/string.h>
#include <linux/kernel.h>
#define CHKSUM_BLOCK_SIZE 1
#define CHKSUM_DIGEST_SIZE 4
/** No default init with ~0 */
static int crc32_cra_init(struct crypto_tfm *tfm)
{
u32 *key = crypto_tfm_ctx(tfm);
*key = 0;
return 0;
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Alexander Boyko | 28 | 100.00% | 1 | 100.00% |
Total | 28 | 100.00% | 1 | 100.00% |
/*
* Setting the seed allows arbitrary accumulators and flexible XOR policy
* If your algorithm starts with ~0, then XOR with ~0 before you set
* the seed.
*/
static int crc32_setkey(struct crypto_shash *hash, const u8 *key,
unsigned int keylen)
{
u32 *mctx = crypto_shash_ctx(hash);
if (keylen != sizeof(u32)) {
crypto_shash_set_flags(hash, CRYPTO_TFM_RES_BAD_KEY_LEN);
return -EINVAL;
}
*mctx = get_unaligned_le32(key);
return 0;
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Alexander Boyko | 61 | 98.39% | 1 | 50.00% |
Eric Biggers | 1 | 1.61% | 1 | 50.00% |
Total | 62 | 100.00% | 2 | 100.00% |
static int crc32_init(struct shash_desc *desc)
{
u32 *mctx = crypto_shash_ctx(desc->tfm);
u32 *crcp = shash_desc_ctx(desc);
*crcp = *mctx;
return 0;
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Alexander Boyko | 40 | 100.00% | 1 | 100.00% |
Total | 40 | 100.00% | 1 | 100.00% |
static int crc32_update(struct shash_desc *desc, const u8 *data,
unsigned int len)
{
u32 *crcp = shash_desc_ctx(desc);
*crcp = crc32_le(*crcp, data, len);
return 0;
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Alexander Boyko | 44 | 97.78% | 1 | 50.00% |
Eric Biggers | 1 | 2.22% | 1 | 50.00% |
Total | 45 | 100.00% | 2 | 100.00% |
/* No final XOR 0xFFFFFFFF, like crc32_le */
static int __crc32_finup(u32 *crcp, const u8 *data, unsigned int len,
u8 *out)
{
put_unaligned_le32(crc32_le(*crcp, data, len), out);
return 0;
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Alexander Boyko | 37 | 90.24% | 1 | 33.33% |
Eric Biggers | 4 | 9.76% | 2 | 66.67% |
Total | 41 | 100.00% | 3 | 100.00% |
static int crc32_finup(struct shash_desc *desc, const u8 *data,
unsigned int len, u8 *out)
{
return __crc32_finup(shash_desc_ctx(desc), data, len, out);
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Alexander Boyko | 39 | 100.00% | 1 | 100.00% |
Total | 39 | 100.00% | 1 | 100.00% |
static int crc32_final(struct shash_desc *desc, u8 *out)
{
u32 *crcp = shash_desc_ctx(desc);
put_unaligned_le32(*crcp, out);
return 0;
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Alexander Boyko | 31 | 88.57% | 1 | 50.00% |
Eric Biggers | 4 | 11.43% | 1 | 50.00% |
Total | 35 | 100.00% | 2 | 100.00% |
static int crc32_digest(struct shash_desc *desc, const u8 *data,
unsigned int len, u8 *out)
{
return __crc32_finup(crypto_shash_ctx(desc->tfm), data, len,
out);
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Alexander Boyko | 41 | 100.00% | 1 | 100.00% |
Total | 41 | 100.00% | 1 | 100.00% |
static struct shash_alg alg = {
.setkey = crc32_setkey,
.init = crc32_init,
.update = crc32_update,
.final = crc32_final,
.finup = crc32_finup,
.digest = crc32_digest,
.descsize = sizeof(u32),
.digestsize = CHKSUM_DIGEST_SIZE,
.base = {
.cra_name = "crc32",
.cra_driver_name = "crc32-generic",
.cra_priority = 100,
.cra_flags = CRYPTO_ALG_OPTIONAL_KEY,
.cra_blocksize = CHKSUM_BLOCK_SIZE,
.cra_ctxsize = sizeof(u32),
.cra_module = THIS_MODULE,
.cra_init = crc32_cra_init,
}
};
static int __init crc32_mod_init(void)
{
return crypto_register_shash(&alg);
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Alexander Boyko | 16 | 100.00% | 1 | 100.00% |
Total | 16 | 100.00% | 1 | 100.00% |
static void __exit crc32_mod_fini(void)
{
crypto_unregister_shash(&alg);
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Alexander Boyko | 15 | 100.00% | 1 | 100.00% |
Total | 15 | 100.00% | 1 | 100.00% |
module_init(crc32_mod_init);
module_exit(crc32_mod_fini);
MODULE_AUTHOR("Alexander Boyko <alexander_boyko@xyratex.com>");
MODULE_DESCRIPTION("CRC32 calculations wrapper for lib/crc32");
MODULE_LICENSE("GPL");
MODULE_ALIAS_CRYPTO("crc32");
MODULE_ALIAS_CRYPTO("crc32-generic");
Overall Contributors
Person | Tokens | Prop | Commits | CommitProp |
Alexander Boyko | 501 | 94.53% | 1 | 16.67% |
Eric Biggers | 18 | 3.40% | 3 | 50.00% |
Herbert Xu | 6 | 1.13% | 1 | 16.67% |
Kees Cook | 5 | 0.94% | 1 | 16.67% |
Total | 530 | 100.00% | 6 | 100.00% |
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