| /* GPL HEADER START |
| * |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License version 2 only, |
| * as published by the Free Software Foundation. |
| * |
| * This program is distributed in the hope that it will be useful, but |
| * WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| * General Public License version 2 for more details (a copy is included |
| * in the LICENSE file that accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License |
| * version 2 along with this program; If not, see http://www.gnu.org/licenses |
| * |
| * Please visit http://www.xyratex.com/contact if you need additional |
| * information or have any questions. |
| * |
| * GPL HEADER END |
| */ |
| |
| /* |
| * Copyright 2012 Xyratex Technology Limited |
| */ |
| |
| /* |
| * This is crypto api shash wrappers to zlib_adler32. |
| */ |
| |
| #include <linux/module.h> |
| #include <linux/zutil.h> |
| #include <crypto/internal/hash.h> |
| #include "linux-crypto.h" |
| |
| #define CHKSUM_BLOCK_SIZE 1 |
| #define CHKSUM_DIGEST_SIZE 4 |
| |
| static int adler32_cra_init(struct crypto_tfm *tfm) |
| { |
| u32 *key = crypto_tfm_ctx(tfm); |
| |
| *key = 1; |
| |
| return 0; |
| } |
| |
| static int adler32_setkey(struct crypto_shash *hash, const u8 *key, |
| unsigned int keylen) |
| { |
| u32 *mctx = crypto_shash_ctx(hash); |
| |
| if (keylen != sizeof(u32)) { |
| crypto_shash_set_flags(hash, CRYPTO_TFM_RES_BAD_KEY_LEN); |
| return -EINVAL; |
| } |
| *mctx = *(u32 *)key; |
| return 0; |
| } |
| |
| static int adler32_init(struct shash_desc *desc) |
| { |
| u32 *mctx = crypto_shash_ctx(desc->tfm); |
| u32 *cksump = shash_desc_ctx(desc); |
| |
| *cksump = *mctx; |
| |
| return 0; |
| } |
| |
| static int adler32_update(struct shash_desc *desc, const u8 *data, |
| unsigned int len) |
| { |
| u32 *cksump = shash_desc_ctx(desc); |
| |
| *cksump = zlib_adler32(*cksump, data, len); |
| return 0; |
| } |
| |
| static int __adler32_finup(u32 *cksump, const u8 *data, unsigned int len, |
| u8 *out) |
| { |
| *(u32 *)out = zlib_adler32(*cksump, data, len); |
| return 0; |
| } |
| |
| static int adler32_finup(struct shash_desc *desc, const u8 *data, |
| unsigned int len, u8 *out) |
| { |
| return __adler32_finup(shash_desc_ctx(desc), data, len, out); |
| } |
| |
| static int adler32_final(struct shash_desc *desc, u8 *out) |
| { |
| u32 *cksump = shash_desc_ctx(desc); |
| |
| *(u32 *)out = *cksump; |
| return 0; |
| } |
| |
| static int adler32_digest(struct shash_desc *desc, const u8 *data, |
| unsigned int len, u8 *out) |
| { |
| return __adler32_finup(crypto_shash_ctx(desc->tfm), data, len, |
| out); |
| } |
| |
| static struct shash_alg alg = { |
| .setkey = adler32_setkey, |
| .init = adler32_init, |
| .update = adler32_update, |
| .final = adler32_final, |
| .finup = adler32_finup, |
| .digest = adler32_digest, |
| .descsize = sizeof(u32), |
| .digestsize = CHKSUM_DIGEST_SIZE, |
| .base = { |
| .cra_name = "adler32", |
| .cra_driver_name = "adler32-zlib", |
| .cra_priority = 100, |
| .cra_blocksize = CHKSUM_BLOCK_SIZE, |
| .cra_ctxsize = sizeof(u32), |
| .cra_module = THIS_MODULE, |
| .cra_init = adler32_cra_init, |
| } |
| }; |
| |
| int cfs_crypto_adler32_register(void) |
| { |
| return crypto_register_shash(&alg); |
| } |
| |
| void cfs_crypto_adler32_unregister(void) |
| { |
| crypto_unregister_shash(&alg); |
| } |