| Loc Ho | 004a403 | 2008-05-14 20:41:47 +0800 | [diff] [blame^] | 1 | /* |
| 2 | * Asynchronous Cryptographic Hash operations. |
| 3 | * |
| 4 | * This is the asynchronous version of hash.c with notification of |
| 5 | * completion via a callback. |
| 6 | * |
| 7 | * Copyright (c) 2008 Loc Ho <lho@amcc.com> |
| 8 | * |
| 9 | * This program is free software; you can redistribute it and/or modify it |
| 10 | * under the terms of the GNU General Public License as published by the Free |
| 11 | * Software Foundation; either version 2 of the License, or (at your option) |
| 12 | * any later version. |
| 13 | * |
| 14 | */ |
| 15 | |
| 16 | #include <crypto/algapi.h> |
| 17 | #include <linux/err.h> |
| 18 | #include <linux/kernel.h> |
| 19 | #include <linux/module.h> |
| 20 | #include <linux/sched.h> |
| 21 | #include <linux/slab.h> |
| 22 | #include <linux/seq_file.h> |
| 23 | |
| 24 | #include "internal.h" |
| 25 | |
| 26 | static int ahash_setkey_unaligned(struct crypto_ahash *tfm, const u8 *key, |
| 27 | unsigned int keylen) |
| 28 | { |
| 29 | struct ahash_alg *ahash = crypto_ahash_alg(tfm); |
| 30 | unsigned long alignmask = crypto_ahash_alignmask(tfm); |
| 31 | int ret; |
| 32 | u8 *buffer, *alignbuffer; |
| 33 | unsigned long absize; |
| 34 | |
| 35 | absize = keylen + alignmask; |
| 36 | buffer = kmalloc(absize, GFP_ATOMIC); |
| 37 | if (!buffer) |
| 38 | return -ENOMEM; |
| 39 | |
| 40 | alignbuffer = (u8 *)ALIGN((unsigned long)buffer, alignmask + 1); |
| 41 | memcpy(alignbuffer, key, keylen); |
| 42 | ret = ahash->setkey(tfm, alignbuffer, keylen); |
| 43 | memset(alignbuffer, 0, keylen); |
| 44 | kfree(buffer); |
| 45 | return ret; |
| 46 | } |
| 47 | |
| 48 | static int ahash_setkey(struct crypto_ahash *tfm, const u8 *key, |
| 49 | unsigned int keylen) |
| 50 | { |
| 51 | struct ahash_alg *ahash = crypto_ahash_alg(tfm); |
| 52 | unsigned long alignmask = crypto_ahash_alignmask(tfm); |
| 53 | |
| 54 | if ((unsigned long)key & alignmask) |
| 55 | return ahash_setkey_unaligned(tfm, key, keylen); |
| 56 | |
| 57 | return ahash->setkey(tfm, key, keylen); |
| 58 | } |
| 59 | |
| 60 | static unsigned int crypto_ahash_ctxsize(struct crypto_alg *alg, u32 type, |
| 61 | u32 mask) |
| 62 | { |
| 63 | return alg->cra_ctxsize; |
| 64 | } |
| 65 | |
| 66 | static int crypto_init_ahash_ops(struct crypto_tfm *tfm, u32 type, u32 mask) |
| 67 | { |
| 68 | struct ahash_alg *alg = &tfm->__crt_alg->cra_ahash; |
| 69 | struct ahash_tfm *crt = &tfm->crt_ahash; |
| 70 | |
| 71 | if (alg->digestsize > crypto_tfm_alg_blocksize(tfm)) |
| 72 | return -EINVAL; |
| 73 | |
| 74 | crt->init = alg->init; |
| 75 | crt->update = alg->update; |
| 76 | crt->final = alg->final; |
| 77 | crt->digest = alg->digest; |
| 78 | crt->setkey = ahash_setkey; |
| 79 | crt->base = __crypto_ahash_cast(tfm); |
| 80 | crt->digestsize = alg->digestsize; |
| 81 | |
| 82 | return 0; |
| 83 | } |
| 84 | |
| 85 | static void crypto_ahash_show(struct seq_file *m, struct crypto_alg *alg) |
| 86 | __attribute__ ((unused)); |
| 87 | static void crypto_ahash_show(struct seq_file *m, struct crypto_alg *alg) |
| 88 | { |
| 89 | seq_printf(m, "type : ahash\n"); |
| 90 | seq_printf(m, "async : %s\n", alg->cra_flags & CRYPTO_ALG_ASYNC ? |
| 91 | "yes" : "no"); |
| 92 | seq_printf(m, "blocksize : %u\n", alg->cra_blocksize); |
| 93 | seq_printf(m, "digestsize : %u\n", alg->cra_hash.digestsize); |
| 94 | } |
| 95 | |
| 96 | const struct crypto_type crypto_ahash_type = { |
| 97 | .ctxsize = crypto_ahash_ctxsize, |
| 98 | .init = crypto_init_ahash_ops, |
| 99 | #ifdef CONFIG_PROC_FS |
| 100 | .show = crypto_ahash_show, |
| 101 | #endif |
| 102 | }; |
| 103 | EXPORT_SYMBOL_GPL(crypto_ahash_type); |
| 104 | |
| 105 | MODULE_LICENSE("GPL"); |
| 106 | MODULE_DESCRIPTION("Asynchronous cryptographic hash type"); |