diff options
Diffstat (limited to 'crypto/crc32c.c')
| -rw-r--r-- | crypto/crc32c.c | 230 |
1 files changed, 0 insertions, 230 deletions
diff --git a/crypto/crc32c.c b/crypto/crc32c.c deleted file mode 100644 index a882d9e4e63..00000000000 --- a/crypto/crc32c.c +++ /dev/null @@ -1,230 +0,0 @@ -/* - * Cryptographic API. - * - * CRC32C chksum - * - * 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/crc32c.h> -#include <linux/kernel.h> - -#define CHKSUM_BLOCK_SIZE 1 -#define CHKSUM_DIGEST_SIZE 4 - -struct chksum_ctx { - u32 crc; - u32 key; -}; - -/* - * Steps through buffer one byte at at time, calculates reflected - * crc using table. - */ - -static void chksum_init(struct crypto_tfm *tfm) -{ - struct chksum_ctx *mctx = crypto_tfm_ctx(tfm); - - mctx->crc = mctx->key; -} - -/* - * 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_tfm *tfm, const u8 *key, - unsigned int keylen) -{ - struct chksum_ctx *mctx = crypto_tfm_ctx(tfm); - - if (keylen != sizeof(mctx->crc)) { - tfm->crt_flags |= CRYPTO_TFM_RES_BAD_KEY_LEN; - return -EINVAL; - } - mctx->key = le32_to_cpu(*(__le32 *)key); - return 0; -} - -static void chksum_update(struct crypto_tfm *tfm, const u8 *data, - unsigned int length) -{ - struct chksum_ctx *mctx = crypto_tfm_ctx(tfm); - - mctx->crc = crc32c(mctx->crc, data, length); -} - -static void chksum_final(struct crypto_tfm *tfm, u8 *out) -{ - struct chksum_ctx *mctx = crypto_tfm_ctx(tfm); - - *(__le32 *)out = ~cpu_to_le32(mctx->crc); -} - -static int crc32c_cra_init_old(struct crypto_tfm *tfm) -{ - struct chksum_ctx *mctx = crypto_tfm_ctx(tfm); - - mctx->key = ~0; - return 0; -} - -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(old_alg.cra_list), - .cra_init = crc32c_cra_init_old, - .cra_u = { - .digest = { - .dia_digestsize= CHKSUM_DIGEST_SIZE, - .dia_setkey = chksum_setkey, - .dia_init = chksum_init, - .dia_update = chksum_update, - .dia_final = chksum_final - } - } -}; - -/* - * 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) -{ - 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); -module_exit(crc32c_mod_fini); - -MODULE_AUTHOR("Clay Haapala <chaapala@cisco.com>"); -MODULE_DESCRIPTION("CRC32c (Castagnoli) calculations wrapper for lib/crc32c"); -MODULE_LICENSE("GPL"); |