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159 lines
3.7 KiB
159 lines
3.7 KiB
/* GPL HEADER START |
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* |
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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* |
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* This program is free software; you can redistribute it and/or modify |
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* it under the terms of the GNU General Public License version 2 only, |
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* as published by the Free Software Foundation. |
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* |
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* This program is distributed in the hope that it will be useful, but |
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* WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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* General Public License version 2 for more details (a copy is included |
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* in the LICENSE file that accompanied this code). |
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* |
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* You should have received a copy of the GNU General Public License |
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* version 2 along with this program; If not, see http://www.gnu.org/licenses |
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* |
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* Please visit http://www.xyratex.com/contact if you need additional |
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* information or have any questions. |
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* |
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* GPL HEADER END |
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*/ |
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/* |
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* Copyright 2012 Xyratex Technology Limited |
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*/ |
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/* |
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* This is crypto api shash wrappers to crc32_le. |
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*/ |
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#include <linux/crc32.h> |
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#include <crypto/internal/hash.h> |
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#include <linux/init.h> |
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#include <linux/module.h> |
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#include <linux/string.h> |
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#include <linux/kernel.h> |
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#define CHKSUM_BLOCK_SIZE 1 |
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#define CHKSUM_DIGEST_SIZE 4 |
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static u32 __crc32_le(u32 crc, unsigned char const *p, size_t len) |
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{ |
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return crc32_le(crc, p, len); |
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} |
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/** No default init with ~0 */ |
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static int crc32_cra_init(struct crypto_tfm *tfm) |
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{ |
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u32 *key = crypto_tfm_ctx(tfm); |
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*key = 0; |
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return 0; |
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} |
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/* |
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* Setting the seed allows arbitrary accumulators and flexible XOR policy |
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* If your algorithm starts with ~0, then XOR with ~0 before you set |
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* the seed. |
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*/ |
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static int crc32_setkey(struct crypto_shash *hash, const u8 *key, |
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unsigned int keylen) |
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{ |
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u32 *mctx = crypto_shash_ctx(hash); |
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if (keylen != sizeof(u32)) { |
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crypto_shash_set_flags(hash, CRYPTO_TFM_RES_BAD_KEY_LEN); |
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return -EINVAL; |
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} |
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*mctx = le32_to_cpup((__le32 *)key); |
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return 0; |
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} |
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static int crc32_init(struct shash_desc *desc) |
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{ |
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u32 *mctx = crypto_shash_ctx(desc->tfm); |
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u32 *crcp = shash_desc_ctx(desc); |
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*crcp = *mctx; |
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return 0; |
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} |
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static int crc32_update(struct shash_desc *desc, const u8 *data, |
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unsigned int len) |
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{ |
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u32 *crcp = shash_desc_ctx(desc); |
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*crcp = __crc32_le(*crcp, data, len); |
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return 0; |
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} |
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/* No final XOR 0xFFFFFFFF, like crc32_le */ |
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static int __crc32_finup(u32 *crcp, const u8 *data, unsigned int len, |
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u8 *out) |
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{ |
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*(__le32 *)out = cpu_to_le32(__crc32_le(*crcp, data, len)); |
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return 0; |
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} |
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static int crc32_finup(struct shash_desc *desc, const u8 *data, |
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unsigned int len, u8 *out) |
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{ |
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return __crc32_finup(shash_desc_ctx(desc), data, len, out); |
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} |
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static int crc32_final(struct shash_desc *desc, u8 *out) |
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{ |
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u32 *crcp = shash_desc_ctx(desc); |
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*(__le32 *)out = cpu_to_le32p(crcp); |
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return 0; |
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} |
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static int crc32_digest(struct shash_desc *desc, const u8 *data, |
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unsigned int len, u8 *out) |
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{ |
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return __crc32_finup(crypto_shash_ctx(desc->tfm), data, len, |
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out); |
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} |
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static struct shash_alg alg = { |
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.setkey = crc32_setkey, |
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.init = crc32_init, |
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.update = crc32_update, |
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.final = crc32_final, |
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.finup = crc32_finup, |
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.digest = crc32_digest, |
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.descsize = sizeof(u32), |
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.digestsize = CHKSUM_DIGEST_SIZE, |
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.base = { |
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.cra_name = "crc32", |
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.cra_driver_name = "crc32-table", |
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.cra_priority = 100, |
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.cra_blocksize = CHKSUM_BLOCK_SIZE, |
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.cra_ctxsize = sizeof(u32), |
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.cra_module = THIS_MODULE, |
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.cra_init = crc32_cra_init, |
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} |
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}; |
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static int __init crc32_mod_init(void) |
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{ |
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return crypto_register_shash(&alg); |
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} |
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static void __exit crc32_mod_fini(void) |
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{ |
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crypto_unregister_shash(&alg); |
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} |
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module_init(crc32_mod_init); |
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module_exit(crc32_mod_fini); |
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MODULE_AUTHOR("Alexander Boyko <alexander_boyko@xyratex.com>"); |
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MODULE_DESCRIPTION("CRC32 calculations wrapper for lib/crc32"); |
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MODULE_LICENSE("GPL"); |
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MODULE_ALIAS_CRYPTO("crc32");
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