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(I'm so sorry!) Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel os linux
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123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130// SPDX-License-Identifier: GPL-2.0-only/* * Copyright 2012 Xyratex Technology Limited */
/* * This is crypto api shash wrappers to crc32_le. */
#include <linux/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;}
/* * 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)) return -EINVAL; *mctx = get_unaligned_le32(key); return 0;}
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;}
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;}
/* 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;}
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);}
static int crc32_final(struct shash_desc *desc, u8 *out){ u32 *crcp = shash_desc_ctx(desc);
put_unaligned_le32(*crcp, out); return 0;}
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);}
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", .base.cra_driver_name = "crc32-lib", .base.cra_priority = 100, .base.cra_flags = CRYPTO_ALG_OPTIONAL_KEY, .base.cra_blocksize = CHKSUM_BLOCK_SIZE, .base.cra_ctxsize = sizeof(u32), .base.cra_module = THIS_MODULE, .base.cra_init = crc32_cra_init,};
static int __init crc32_mod_init(void){ return crypto_register_shash(&alg);}
static void __exit crc32_mod_fini(void){ crypto_unregister_shash(&alg);}
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");