6 * Copyright (c) 2002 James Morris <jmorris@intercode.com.au>
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)
16 #include <linux/errno.h>
17 #include <linux/highmem.h>
18 #include <linux/module.h>
19 #include <linux/scatterlist.h>
22 #include "scatterwalk.h"
24 static int init(struct hash_desc *desc)
26 struct crypto_tfm *tfm = crypto_hash_tfm(desc->tfm);
28 tfm->__crt_alg->cra_digest.dia_init(tfm);
32 static int update(struct hash_desc *desc,
33 struct scatterlist *sg, unsigned int nbytes)
35 struct crypto_tfm *tfm = crypto_hash_tfm(desc->tfm);
36 unsigned int alignmask = crypto_tfm_alg_alignmask(tfm);
42 struct page *pg = sg->page;
43 unsigned int offset = sg->offset;
44 unsigned int l = sg->length;
46 if (unlikely(l > nbytes))
51 unsigned int bytes_from_page = min(l, ((unsigned int)
54 char *src = crypto_kmap(pg, 0);
55 char *p = src + offset;
57 if (unlikely(offset & alignmask)) {
59 alignmask + 1 - (offset & alignmask);
60 bytes = min(bytes, bytes_from_page);
61 tfm->__crt_alg->cra_digest.dia_update(tfm, p,
64 bytes_from_page -= bytes;
67 tfm->__crt_alg->cra_digest.dia_update(tfm, p,
69 crypto_kunmap(src, 0);
70 crypto_yield(desc->flags);
84 static void update_kernel(struct hash_desc *desc,
85 const void *data, size_t count)
87 struct crypto_tfm *tfm = crypto_hash_tfm(desc->tfm);
88 tfm->__crt_alg->cra_digest.dia_update(tfm, data, count);
89 crypto_yield(desc->flags);
92 static int final(struct hash_desc *desc, u8 *out)
94 struct crypto_tfm *tfm = crypto_hash_tfm(desc->tfm);
95 unsigned long alignmask = crypto_tfm_alg_alignmask(tfm);
96 struct digest_alg *digest = &tfm->__crt_alg->cra_digest;
98 if (unlikely((unsigned long)out & alignmask)) {
99 unsigned long align = alignmask + 1;
100 unsigned long addr = (unsigned long)crypto_tfm_ctx(tfm);
101 u8 *dst = (u8 *)ALIGN(addr, align) +
102 ALIGN(tfm->__crt_alg->cra_ctxsize, align);
104 digest->dia_final(tfm, dst);
105 memcpy(out, dst, digest->dia_digestsize);
107 digest->dia_final(tfm, out);
112 static int nosetkey(struct crypto_hash *tfm, const u8 *key, unsigned int keylen)
114 crypto_hash_clear_flags(tfm, CRYPTO_TFM_RES_MASK);
118 static int setkey(struct crypto_hash *hash, const u8 *key, unsigned int keylen)
120 struct crypto_tfm *tfm = crypto_hash_tfm(hash);
122 crypto_hash_clear_flags(hash, CRYPTO_TFM_RES_MASK);
123 return tfm->__crt_alg->cra_digest.dia_setkey(tfm, key, keylen);
126 static int digest(struct hash_desc *desc,
127 struct scatterlist *sg, unsigned int nbytes, u8 *out)
130 update(desc, sg, nbytes);
131 return final(desc, out);
134 int crypto_init_digest_flags(struct crypto_tfm *tfm, u32 flags)
136 return flags ? -EINVAL : 0;
139 int crypto_init_digest_ops(struct crypto_tfm *tfm)
141 struct hash_tfm *ops = &tfm->crt_hash;
142 struct digest_alg *dalg = &tfm->__crt_alg->cra_digest;
144 if (dalg->dia_digestsize > crypto_tfm_alg_blocksize(tfm))
148 ops->update = update;
149 ops->update_kernel = update_kernel;
151 ops->digest = digest;
152 ops->setkey = dalg->dia_setkey ? setkey : nosetkey;
153 ops->digestsize = dalg->dia_digestsize;
158 void crypto_exit_digest_ops(struct crypto_tfm *tfm)