[NETFILTER]: ipt_TCPMSS: reformat
[hh.org.git] / crypto / digest.c
blob0155a94e4b15432b636559124370436fa8edf5af
1 /*
2 * Cryptographic API.
4 * Digest operations.
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)
11 * any later version.
15 #include <linux/mm.h>
16 #include <linux/errno.h>
17 #include <linux/highmem.h>
18 #include <linux/module.h>
19 #include <linux/scatterlist.h>
21 #include "internal.h"
22 #include "scatterwalk.h"
24 void crypto_digest_init(struct crypto_tfm *tfm)
26 struct crypto_hash *hash = crypto_hash_cast(tfm);
27 struct hash_desc desc = { .tfm = hash, .flags = tfm->crt_flags };
29 crypto_hash_init(&desc);
31 EXPORT_SYMBOL_GPL(crypto_digest_init);
33 void crypto_digest_update(struct crypto_tfm *tfm,
34 struct scatterlist *sg, unsigned int nsg)
36 struct crypto_hash *hash = crypto_hash_cast(tfm);
37 struct hash_desc desc = { .tfm = hash, .flags = tfm->crt_flags };
38 unsigned int nbytes = 0;
39 unsigned int i;
41 for (i = 0; i < nsg; i++)
42 nbytes += sg[i].length;
44 crypto_hash_update(&desc, sg, nbytes);
46 EXPORT_SYMBOL_GPL(crypto_digest_update);
48 void crypto_digest_final(struct crypto_tfm *tfm, u8 *out)
50 struct crypto_hash *hash = crypto_hash_cast(tfm);
51 struct hash_desc desc = { .tfm = hash, .flags = tfm->crt_flags };
53 crypto_hash_final(&desc, out);
55 EXPORT_SYMBOL_GPL(crypto_digest_final);
57 void crypto_digest_digest(struct crypto_tfm *tfm,
58 struct scatterlist *sg, unsigned int nsg, u8 *out)
60 struct crypto_hash *hash = crypto_hash_cast(tfm);
61 struct hash_desc desc = { .tfm = hash, .flags = tfm->crt_flags };
62 unsigned int nbytes = 0;
63 unsigned int i;
65 for (i = 0; i < nsg; i++)
66 nbytes += sg[i].length;
68 crypto_hash_digest(&desc, sg, nbytes, out);
70 EXPORT_SYMBOL_GPL(crypto_digest_digest);
72 static int init(struct hash_desc *desc)
74 struct crypto_tfm *tfm = crypto_hash_tfm(desc->tfm);
76 tfm->__crt_alg->cra_digest.dia_init(tfm);
77 return 0;
80 static int update(struct hash_desc *desc,
81 struct scatterlist *sg, unsigned int nbytes)
83 struct crypto_tfm *tfm = crypto_hash_tfm(desc->tfm);
84 unsigned int alignmask = crypto_tfm_alg_alignmask(tfm);
86 if (!nbytes)
87 return 0;
89 for (;;) {
90 struct page *pg = sg->page;
91 unsigned int offset = sg->offset;
92 unsigned int l = sg->length;
94 if (unlikely(l > nbytes))
95 l = nbytes;
96 nbytes -= l;
98 do {
99 unsigned int bytes_from_page = min(l, ((unsigned int)
100 (PAGE_SIZE)) -
101 offset);
102 char *src = crypto_kmap(pg, 0);
103 char *p = src + offset;
105 if (unlikely(offset & alignmask)) {
106 unsigned int bytes =
107 alignmask + 1 - (offset & alignmask);
108 bytes = min(bytes, bytes_from_page);
109 tfm->__crt_alg->cra_digest.dia_update(tfm, p,
110 bytes);
111 p += bytes;
112 bytes_from_page -= bytes;
113 l -= bytes;
115 tfm->__crt_alg->cra_digest.dia_update(tfm, p,
116 bytes_from_page);
117 crypto_kunmap(src, 0);
118 crypto_yield(desc->flags);
119 offset = 0;
120 pg++;
121 l -= bytes_from_page;
122 } while (l > 0);
124 if (!nbytes)
125 break;
126 sg = sg_next(sg);
129 return 0;
132 static int final(struct hash_desc *desc, u8 *out)
134 struct crypto_tfm *tfm = crypto_hash_tfm(desc->tfm);
135 unsigned long alignmask = crypto_tfm_alg_alignmask(tfm);
136 struct digest_alg *digest = &tfm->__crt_alg->cra_digest;
138 if (unlikely((unsigned long)out & alignmask)) {
139 unsigned long align = alignmask + 1;
140 unsigned long addr = (unsigned long)crypto_tfm_ctx(tfm);
141 u8 *dst = (u8 *)ALIGN(addr, align) +
142 ALIGN(tfm->__crt_alg->cra_ctxsize, align);
144 digest->dia_final(tfm, dst);
145 memcpy(out, dst, digest->dia_digestsize);
146 } else
147 digest->dia_final(tfm, out);
149 return 0;
152 static int nosetkey(struct crypto_hash *tfm, const u8 *key, unsigned int keylen)
154 crypto_hash_clear_flags(tfm, CRYPTO_TFM_RES_MASK);
155 return -ENOSYS;
158 static int setkey(struct crypto_hash *hash, const u8 *key, unsigned int keylen)
160 struct crypto_tfm *tfm = crypto_hash_tfm(hash);
162 crypto_hash_clear_flags(hash, CRYPTO_TFM_RES_MASK);
163 return tfm->__crt_alg->cra_digest.dia_setkey(tfm, key, keylen);
166 static int digest(struct hash_desc *desc,
167 struct scatterlist *sg, unsigned int nbytes, u8 *out)
169 init(desc);
170 update(desc, sg, nbytes);
171 return final(desc, out);
174 int crypto_init_digest_flags(struct crypto_tfm *tfm, u32 flags)
176 return flags ? -EINVAL : 0;
179 int crypto_init_digest_ops(struct crypto_tfm *tfm)
181 struct hash_tfm *ops = &tfm->crt_hash;
182 struct digest_alg *dalg = &tfm->__crt_alg->cra_digest;
184 if (dalg->dia_digestsize > crypto_tfm_alg_blocksize(tfm))
185 return -EINVAL;
187 ops->init = init;
188 ops->update = update;
189 ops->final = final;
190 ops->digest = digest;
191 ops->setkey = dalg->dia_setkey ? setkey : nosetkey;
192 ops->digestsize = dalg->dia_digestsize;
194 return 0;
197 void crypto_exit_digest_ops(struct crypto_tfm *tfm)