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)
14 #include <linux/crypto.h>
16 #include <linux/errno.h>
17 #include <linux/highmem.h>
18 #include <asm/scatterlist.h>
21 static void init(struct crypto_tfm *tfm)
23 tfm->__crt_alg->cra_digest.dia_init(crypto_tfm_ctx(tfm));
26 static void update(struct crypto_tfm *tfm,
27 struct scatterlist *sg, unsigned int nsg)
30 unsigned int alignmask = crypto_tfm_alg_alignmask(tfm);
32 for (i = 0; i < nsg; i++) {
34 struct page *pg = sg[i].page;
35 unsigned int offset = sg[i].offset;
36 unsigned int l = sg[i].length;
39 unsigned int bytes_from_page = min(l, ((unsigned int)
42 char *src = crypto_kmap(pg, 0);
43 char *p = src + offset;
45 if (unlikely(offset & alignmask)) {
47 alignmask + 1 - (offset & alignmask);
48 bytes = min(bytes, bytes_from_page);
49 tfm->__crt_alg->cra_digest.dia_update
50 (crypto_tfm_ctx(tfm), p,
53 bytes_from_page -= bytes;
56 tfm->__crt_alg->cra_digest.dia_update
57 (crypto_tfm_ctx(tfm), p,
59 crypto_kunmap(src, 0);
68 static void final(struct crypto_tfm *tfm, u8 *out)
70 unsigned long alignmask = crypto_tfm_alg_alignmask(tfm);
71 if (unlikely((unsigned long)out & alignmask)) {
72 unsigned int size = crypto_tfm_alg_digestsize(tfm);
73 u8 buffer[size + alignmask];
74 u8 *dst = (u8 *)ALIGN((unsigned long)buffer, alignmask + 1);
75 tfm->__crt_alg->cra_digest.dia_final(crypto_tfm_ctx(tfm), dst);
76 memcpy(out, dst, size);
78 tfm->__crt_alg->cra_digest.dia_final(crypto_tfm_ctx(tfm), out);
81 static int setkey(struct crypto_tfm *tfm, const u8 *key, unsigned int keylen)
84 if (tfm->__crt_alg->cra_digest.dia_setkey == NULL)
86 return tfm->__crt_alg->cra_digest.dia_setkey(crypto_tfm_ctx(tfm),
90 static void digest(struct crypto_tfm *tfm,
91 struct scatterlist *sg, unsigned int nsg, u8 *out)
98 int crypto_init_digest_flags(struct crypto_tfm *tfm, u32 flags)
100 return flags ? -EINVAL : 0;
103 int crypto_init_digest_ops(struct crypto_tfm *tfm)
105 struct digest_tfm *ops = &tfm->crt_digest;
107 ops->dit_init = init;
108 ops->dit_update = update;
109 ops->dit_final = final;
110 ops->dit_digest = digest;
111 ops->dit_setkey = setkey;
113 return crypto_alloc_hmac_block(tfm);
116 void crypto_exit_digest_ops(struct crypto_tfm *tfm)
118 crypto_free_hmac_block(tfm);