Release 4.11 crypto/crc32c_generic.c
/*
* Cryptographic API.
*
* CRC32C chksum
*
*@Article{castagnoli-crc,
* author = { Guy Castagnoli and Stefan Braeuer and Martin Herrman},
* title = {{Optimization of Cyclic Redundancy-Check Codes with 24
* and 32 Parity Bits}},
* journal = IEEE Transactions on Communication,
* year = {1993},
* volume = {41},
* number = {6},
* pages = {},
* month = {June},
*}
* Used by the iSCSI driver, possibly others, and derived from the
* the iscsi-crc.c module of the linux-iscsi driver at
* http://linux-iscsi.sourceforge.net.
*
* Following the example of lib/crc32, this function is intended to be
* flexible and useful for all users. Modules that currently have their
* own crc32c, but hopefully may be able to use this one are:
* net/sctp (please add all your doco to here if you change to
* use this one!)
* <endoflist>
*
* Copyright (c) 2004 Cisco Systems, Inc.
* Copyright (c) 2008 Herbert Xu <herbert@gondor.apana.org.au>
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the Free
* Software Foundation; either version 2 of the License, or (at your option)
* any later version.
*
*/
#include <crypto/internal/hash.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/string.h>
#include <linux/kernel.h>
#include <linux/crc32.h>
#define CHKSUM_BLOCK_SIZE 1
#define CHKSUM_DIGEST_SIZE 4
struct chksum_ctx {
u32 key;
};
struct chksum_desc_ctx {
u32 crc;
};
/*
* Steps through buffer one byte at at time, calculates reflected
* crc using table.
*/
static int chksum_init(struct shash_desc *desc)
{
struct chksum_ctx *mctx = crypto_shash_ctx(desc->tfm);
struct chksum_desc_ctx *ctx = shash_desc_ctx(desc);
ctx->crc = mctx->key;
return 0;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Herbert Xu | 27 | 61.36% | 3 | 75.00% |
| Clay Haapala | 17 | 38.64% | 1 | 25.00% |
| Total | 44 | 100.00% | 4 | 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 chksum_setkey(struct crypto_shash *tfm, const u8 *key,
unsigned int keylen)
{
struct chksum_ctx *mctx = crypto_shash_ctx(tfm);
if (keylen != sizeof(mctx->key)) {
crypto_shash_set_flags(tfm, CRYPTO_TFM_RES_BAD_KEY_LEN);
return -EINVAL;
}
mctx->key = le32_to_cpu(*(__le32 *)key);
return 0;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Clay Haapala | 55 | 77.46% | 1 | 20.00% |
| Herbert Xu | 16 | 22.54% | 4 | 80.00% |
| Total | 71 | 100.00% | 5 | 100.00% |
static int chksum_update(struct shash_desc *desc, const u8 *data,
unsigned int length)
{
struct chksum_desc_ctx *ctx = shash_desc_ctx(desc);
ctx->crc = __crc32c_le(ctx->crc, data, length);
return 0;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Clay Haapala | 30 | 62.50% | 2 | 33.33% |
| Herbert Xu | 17 | 35.42% | 3 | 50.00% |
| Darrick J. Wong | 1 | 2.08% | 1 | 16.67% |
| Total | 48 | 100.00% | 6 | 100.00% |
static int chksum_final(struct shash_desc *desc, u8 *out)
{
struct chksum_desc_ctx *ctx = shash_desc_ctx(desc);
*(__le32 *)out = ~cpu_to_le32p(&ctx->crc);
return 0;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Clay Haapala | 23 | 52.27% | 1 | 25.00% |
| Herbert Xu | 21 | 47.73% | 3 | 75.00% |
| Total | 44 | 100.00% | 4 | 100.00% |
static int __chksum_finup(u32 *crcp, const u8 *data, unsigned int len, u8 *out)
{
*(__le32 *)out = ~cpu_to_le32(__crc32c_le(*crcp, data, len));
return 0;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Herbert Xu | 46 | 97.87% | 2 | 66.67% |
| Darrick J. Wong | 1 | 2.13% | 1 | 33.33% |
| Total | 47 | 100.00% | 3 | 100.00% |
static int chksum_finup(struct shash_desc *desc, const u8 *data,
unsigned int len, u8 *out)
{
struct chksum_desc_ctx *ctx = shash_desc_ctx(desc);
return __chksum_finup(&ctx->crc, data, len, out);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Herbert Xu | 49 | 100.00% | 2 | 100.00% |
| Total | 49 | 100.00% | 2 | 100.00% |
static int chksum_digest(struct shash_desc *desc, const u8 *data,
unsigned int length, u8 *out)
{
struct chksum_ctx *mctx = crypto_shash_ctx(desc->tfm);
return __chksum_finup(&mctx->key, data, length, out);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Herbert Xu | 51 | 100.00% | 2 | 100.00% |
| Total | 51 | 100.00% | 2 | 100.00% |
static int crc32c_cra_init(struct crypto_tfm *tfm)
{
struct chksum_ctx *mctx = crypto_tfm_ctx(tfm);
mctx->key = ~0;
return 0;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Herbert Xu | 31 | 100.00% | 2 | 100.00% |
| Total | 31 | 100.00% | 2 | 100.00% |
static struct shash_alg alg = {
.digestsize = CHKSUM_DIGEST_SIZE,
.setkey = chksum_setkey,
.init = chksum_init,
.update = chksum_update,
.final = chksum_final,
.finup = chksum_finup,
.digest = chksum_digest,
.descsize = sizeof(struct chksum_desc_ctx),
.base = {
.cra_name = "crc32c",
.cra_driver_name = "crc32c-generic",
.cra_priority = 100,
.cra_blocksize = CHKSUM_BLOCK_SIZE,
.cra_alignmask = 3,
.cra_ctxsize = sizeof(struct chksum_ctx),
.cra_module = THIS_MODULE,
.cra_init = crc32c_cra_init,
}
};
static int __init crc32c_mod_init(void)
{
return crypto_register_shash(&alg);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Clay Haapala | 14 | 87.50% | 1 | 33.33% |
| Herbert Xu | 1 | 6.25% | 1 | 33.33% |
| Kamalesh Babulal | 1 | 6.25% | 1 | 33.33% |
| Total | 16 | 100.00% | 3 | 100.00% |
static void __exit crc32c_mod_fini(void)
{
crypto_unregister_shash(&alg);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Clay Haapala | 13 | 86.67% | 1 | 33.33% |
| Kamalesh Babulal | 1 | 6.67% | 1 | 33.33% |
| Herbert Xu | 1 | 6.67% | 1 | 33.33% |
| Total | 15 | 100.00% | 3 | 100.00% |
module_init(crc32c_mod_init);
module_exit(crc32c_mod_fini);
MODULE_AUTHOR("Clay Haapala <chaapala@cisco.com>");
MODULE_DESCRIPTION("CRC32c (Castagnoli) calculations wrapper for lib/crc32c");
MODULE_LICENSE("GPL");
MODULE_ALIAS_CRYPTO("crc32c");
MODULE_ALIAS_CRYPTO("crc32c-generic");
Overall Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Herbert Xu | 377 | 63.26% | 5 | 38.46% |
| Clay Haapala | 198 | 33.22% | 2 | 15.38% |
| Darrick J. Wong | 5 | 0.84% | 1 | 7.69% |
| Mathias Krause | 5 | 0.84% | 1 | 7.69% |
| Kamalesh Babulal | 4 | 0.67% | 1 | 7.69% |
| Tim Chen | 4 | 0.67% | 1 | 7.69% |
| Richard Hartmann | 2 | 0.34% | 1 | 7.69% |
| Kees Cook | 1 | 0.17% | 1 | 7.69% |
| Total | 596 | 100.00% | 13 | 100.00% |
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