crypto: crc32c - Add ahash implementation (5773a3e6) · Commits · 戴 / test

crypto/Kconfig

+1 −1

Original line number	Diff line number	Diff line
		@@ -213,7 +213,7 @@ comment "Digest"

		config CRYPTO_CRC32C
		tristate "CRC32c CRC algorithm"
		select CRYPTO_ALGAPI
		select CRYPTO_HASH
		select LIBCRC32C
		help
		Castagnoli, et al Cyclic Redundancy-Check Algorithm. Used

crypto/crc32c.c

+121 −7

Original line number	Diff line number	Diff line
		@@ -5,20 +5,23 @@
		*
		* This module file is a wrapper to invoke the lib/crc32c routines.
		*
		* 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/crypto.h>
		#include <linux/crc32c.h>
		#include <linux/kernel.h>

		#define CHKSUM_BLOCK_SIZE 32
		#define CHKSUM_BLOCK_SIZE 1
		#define CHKSUM_DIGEST_SIZE 4

		struct chksum_ctx {
		@@ -71,7 +74,7 @@ static void chksum_final(struct crypto_tfm tfm, u8 out)
		(__le32 )out = ~cpu_to_le32(mctx->crc);
		}

		static int crc32c_cra_init(struct crypto_tfm *tfm)
		static int crc32c_cra_init_old(struct crypto_tfm *tfm)
		{
		struct chksum_ctx *mctx = crypto_tfm_ctx(tfm);

		@@ -79,14 +82,14 @@ static int crc32c_cra_init(struct crypto_tfm *tfm)
		return 0;
		}

		static struct crypto_alg alg = {
		static struct crypto_alg old_alg = {
		.cra_name = "crc32c",
		.cra_flags = CRYPTO_ALG_TYPE_DIGEST,
		.cra_blocksize = CHKSUM_BLOCK_SIZE,
		.cra_ctxsize = sizeof(struct chksum_ctx),
		.cra_module = THIS_MODULE,
		.cra_list = LIST_HEAD_INIT(alg.cra_list),
		.cra_init = crc32c_cra_init,
		.cra_list = LIST_HEAD_INIT(old_alg.cra_list),
		.cra_init = crc32c_cra_init_old,
		.cra_u = {
		.digest = {
		.dia_digestsize= CHKSUM_DIGEST_SIZE,
		@@ -98,14 +101,125 @@ static struct crypto_alg alg = {
		}
		};

		/*
		* 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 crc32c_setkey(struct crypto_ahash hash, const u8 key,
		unsigned int keylen)
		{
		u32 *mctx = crypto_ahash_ctx(hash);

		if (keylen != sizeof(u32)) {
		crypto_ahash_set_flags(hash, CRYPTO_TFM_RES_BAD_KEY_LEN);
		return -EINVAL;
		}
		mctx = le32_to_cpup((__le32 )key);
		return 0;
		}

		static int crc32c_init(struct ahash_request *req)
		{
		u32 *mctx = crypto_ahash_ctx(crypto_ahash_reqtfm(req));
		u32 *crcp = ahash_request_ctx(req);

		crcp = mctx;
		return 0;
		}

		static int crc32c_update(struct ahash_request *req)
		{
		struct crypto_hash_walk walk;
		u32 *crcp = ahash_request_ctx(req);
		u32 crc = *crcp;
		int nbytes;

		for (nbytes = crypto_hash_walk_first(req, &walk); nbytes;
		nbytes = crypto_hash_walk_done(&walk, 0))
		crc = crc32c(crc, walk.data, nbytes);

		*crcp = crc;
		return 0;
		}

		static int crc32c_final(struct ahash_request *req)
		{
		u32 *crcp = ahash_request_ctx(req);

		(__le32 )req->result = ~cpu_to_le32p(crcp);
		return 0;
		}

		static int crc32c_digest(struct ahash_request *req)
		{
		struct crypto_hash_walk walk;
		u32 *mctx = crypto_ahash_ctx(crypto_ahash_reqtfm(req));
		u32 crc = *mctx;
		int nbytes;

		for (nbytes = crypto_hash_walk_first(req, &walk); nbytes;
		nbytes = crypto_hash_walk_done(&walk, 0))
		crc = crc32c(crc, walk.data, nbytes);

		(__le32 )req->result = ~cpu_to_le32(crc);
		return 0;
		}

		static int crc32c_cra_init(struct crypto_tfm *tfm)
		{
		u32 *key = crypto_tfm_ctx(tfm);

		*key = ~0;

		tfm->crt_ahash.reqsize = sizeof(u32);

		return 0;
		}

		static struct crypto_alg alg = {
		.cra_name = "crc32c",
		.cra_driver_name = "crc32c-generic",
		.cra_priority = 100,
		.cra_flags = CRYPTO_ALG_TYPE_AHASH,
		.cra_blocksize = CHKSUM_BLOCK_SIZE,
		.cra_alignmask = 3,
		.cra_ctxsize = sizeof(u32),
		.cra_module = THIS_MODULE,
		.cra_list = LIST_HEAD_INIT(alg.cra_list),
		.cra_init = crc32c_cra_init,
		.cra_type = &crypto_ahash_type,
		.cra_u = {
		.ahash = {
		.digestsize = CHKSUM_DIGEST_SIZE,
		.setkey = crc32c_setkey,
		.init = crc32c_init,
		.update = crc32c_update,
		.final = crc32c_final,
		.digest = crc32c_digest,
		}
		}
		};

		static int __init crc32c_mod_init(void)
		{
		return crypto_register_alg(&alg);
		int err;

		err = crypto_register_alg(&old_alg);
		if (err)
		return err;

		err = crypto_register_alg(&alg);
		if (err)
		crypto_unregister_alg(&old_alg);

		return err;
		}

		static void __exit crc32c_mod_fini(void)
		{
		crypto_unregister_alg(&alg);
		crypto_unregister_alg(&old_alg);
		}

		module_init(crc32c_mod_init);

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