git://bbs.cooldavid.org / net-next-2.6.git / blame
| Commit | Line | Data |
|---|---|---|
| 1da177e4 LT |
1 | /* |
| 2 | * Cryptographic API. | |
| 3 | * | |
| 4 | * Digest operations. | |
| 5 | * | |
| 6 | * Copyright (c) 2002 James Morris <jmorris@intercode.com.au> | |
| 7 | * | |
| 8 | * This program is free software; you can redistribute it and/or modify it | |
| 9 | * under the terms of the GNU General Public License as published by the Free | |
| 10 | * Software Foundation; either version 2 of the License, or (at your option) | |
| 11 | * any later version. | |
| 12 | * | |
| 13 | */ | |
| 14 | #include <linux/crypto.h> | |
| 15 | #include <linux/mm.h> | |
| 16 | #include <linux/errno.h> | |
| 17 | #include <linux/highmem.h> | |
| 18 | #include <asm/scatterlist.h> | |
| 19 | #include "internal.h" | |
| 20 | ||
| 21 | static void init(struct crypto_tfm *tfm) | |
| 22 | { | |
| 23 | tfm->__crt_alg->cra_digest.dia_init(crypto_tfm_ctx(tfm)); | |
| 24 | } | |
| 25 | ||
| 26 | static void update(struct crypto_tfm *tfm, | |
| 27 | struct scatterlist *sg, unsigned int nsg) | |
| 28 | { | |
| 29 | unsigned int i; | |
| 30 | ||
| 31 | for (i = 0; i < nsg; i++) { | |
| 32 | ||
| 33 | struct page *pg = sg[i].page; | |
| 34 | unsigned int offset = sg[i].offset; | |
| 35 | unsigned int l = sg[i].length; | |
| 36 | ||
| 37 | do { | |
| 38 | unsigned int bytes_from_page = min(l, ((unsigned int) | |
| 39 | (PAGE_SIZE)) - | |
| 40 | offset); | |
| 41 | char *p = crypto_kmap(pg, 0) + offset; | |
| 42 | ||
| 43 | tfm->__crt_alg->cra_digest.dia_update | |
| 44 | (crypto_tfm_ctx(tfm), p, | |
| 45 | bytes_from_page); | |
| 46 | crypto_kunmap(p, 0); | |
| 47 | crypto_yield(tfm); | |
| 48 | offset = 0; | |
| 49 | pg++; | |
| 50 | l -= bytes_from_page; | |
| 51 | } while (l > 0); | |
| 52 | } | |
| 53 | } | |
| 54 | ||
| 55 | static void final(struct crypto_tfm *tfm, u8 *out) | |
| 56 | { | |
| 57 | tfm->__crt_alg->cra_digest.dia_final(crypto_tfm_ctx(tfm), out); | |
| 58 | } | |
| 59 | ||
| 60 | static int setkey(struct crypto_tfm *tfm, const u8 *key, unsigned int keylen) | |
| 61 | { | |
| 62 | u32 flags; | |
| 63 | if (tfm->__crt_alg->cra_digest.dia_setkey == NULL) | |
| 64 | return -ENOSYS; | |
| 65 | return tfm->__crt_alg->cra_digest.dia_setkey(crypto_tfm_ctx(tfm), | |
| 66 | key, keylen, &flags); | |
| 67 | } | |
| 68 | ||
| 69 | static void digest(struct crypto_tfm *tfm, | |
| 70 | struct scatterlist *sg, unsigned int nsg, u8 *out) | |
| 71 | { | |
| 72 | unsigned int i; | |
| 73 | ||
| 74 | tfm->crt_digest.dit_init(tfm); | |
| 75 | ||
| 76 | for (i = 0; i < nsg; i++) { | |
| 77 | char *p = crypto_kmap(sg[i].page, 0) + sg[i].offset; | |
| 78 | tfm->__crt_alg->cra_digest.dia_update(crypto_tfm_ctx(tfm), | |
| 79 | p, sg[i].length); | |
| 80 | crypto_kunmap(p, 0); | |
| 81 | crypto_yield(tfm); | |
| 82 | } | |
| 83 | crypto_digest_final(tfm, out); | |
| 84 | } | |
| 85 | ||
| 86 | int crypto_init_digest_flags(struct crypto_tfm *tfm, u32 flags) | |
| 87 | { | |
| 88 | return flags ? -EINVAL : 0; | |
| 89 | } | |
| 90 | ||
| 91 | int crypto_init_digest_ops(struct crypto_tfm *tfm) | |
| 92 | { | |
| 93 | struct digest_tfm *ops = &tfm->crt_digest; | |
| 94 | ||
| 95 | ops->dit_init = init; | |
| 96 | ops->dit_update = update; | |
| 97 | ops->dit_final = final; | |
| 98 | ops->dit_digest = digest; | |
| 99 | ops->dit_setkey = setkey; | |
| 100 | ||
| 101 | return crypto_alloc_hmac_block(tfm); | |
| 102 | } | |
| 103 | ||
| 104 | void crypto_exit_digest_ops(struct crypto_tfm *tfm) | |
| 105 | { | |
| 106 | crypto_free_hmac_block(tfm); | |
| 107 | } |