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/hardirq.h>
18 #include <linux/highmem.h>
19 #include <linux/kernel.h>
20 #include <linux/module.h>
21 #include <linux/scatterlist.h>
25 static int init(struct hash_desc *desc)
27 struct crypto_tfm *tfm = crypto_hash_tfm(desc->tfm);
29 tfm->__crt_alg->cra_digest.dia_init(tfm);
33 static int update2(struct hash_desc *desc,
34 struct scatterlist *sg, unsigned int nbytes)
36 struct crypto_tfm *tfm = crypto_hash_tfm(desc->tfm);
37 unsigned int alignmask = crypto_tfm_alg_alignmask(tfm);
43 struct page *pg = sg_page(sg);
44 unsigned int offset = sg->offset;
45 unsigned int l = sg->length;
47 if (unlikely(l > nbytes))
52 unsigned int bytes_from_page = min(l, ((unsigned int)
55 char *src = crypto_kmap(pg, 0);
56 char *p = src + offset;
58 if (unlikely(offset & alignmask)) {
60 alignmask + 1 - (offset & alignmask);
61 bytes = min(bytes, bytes_from_page);
62 tfm->__crt_alg->cra_digest.dia_update(tfm, p,
65 bytes_from_page -= bytes;
68 tfm->__crt_alg->cra_digest.dia_update(tfm, p,
70 crypto_kunmap(src, 0);
71 crypto_yield(desc->flags);
85 static int update(struct hash_desc *desc,
86 struct scatterlist *sg, unsigned int nbytes)
88 if (WARN_ON_ONCE(in_irq()))
90 return update2(desc, sg, nbytes);
93 static int final(struct hash_desc *desc, u8 *out)
95 struct crypto_tfm *tfm = crypto_hash_tfm(desc->tfm);
96 unsigned long alignmask = crypto_tfm_alg_alignmask(tfm);
97 struct digest_alg *digest = &tfm->__crt_alg->cra_digest;
99 if (unlikely((unsigned long)out & alignmask)) {
100 unsigned long align = alignmask + 1;
101 unsigned long addr = (unsigned long)crypto_tfm_ctx(tfm);
102 u8 *dst = (u8 *)ALIGN(addr, align) +
103 ALIGN(tfm->__crt_alg->cra_ctxsize, align);
105 digest->dia_final(tfm, dst);
106 memcpy(out, dst, digest->dia_digestsize);
108 digest->dia_final(tfm, out);
113 static int nosetkey(struct crypto_hash *tfm, const u8 *key, unsigned int keylen)
115 crypto_hash_clear_flags(tfm, CRYPTO_TFM_RES_MASK);
119 static int setkey(struct crypto_hash *hash, const u8 *key, unsigned int keylen)
121 struct crypto_tfm *tfm = crypto_hash_tfm(hash);
123 crypto_hash_clear_flags(hash, CRYPTO_TFM_RES_MASK);
124 return tfm->__crt_alg->cra_digest.dia_setkey(tfm, key, keylen);
127 static int digest(struct hash_desc *desc,
128 struct scatterlist *sg, unsigned int nbytes, u8 *out)
130 if (WARN_ON_ONCE(in_irq()))
134 update2(desc, sg, nbytes);
135 return final(desc, out);
138 int crypto_init_digest_ops(struct crypto_tfm *tfm)
140 struct hash_tfm *ops = &tfm->crt_hash;
141 struct digest_alg *dalg = &tfm->__crt_alg->cra_digest;
143 if (dalg->dia_digestsize > crypto_tfm_alg_blocksize(tfm))
147 ops->update = update;
149 ops->digest = digest;
150 ops->setkey = dalg->dia_setkey ? setkey : nosetkey;
151 ops->digestsize = dalg->dia_digestsize;
156 void crypto_exit_digest_ops(struct crypto_tfm *tfm)