mirror of
https://github.com/torvalds/linux.git
synced 2024-11-15 00:21:59 +00:00
1da177e4c3
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
108 lines
2.5 KiB
C
108 lines
2.5 KiB
C
/*
|
|
* Cryptographic API.
|
|
*
|
|
* Digest operations.
|
|
*
|
|
* Copyright (c) 2002 James Morris <jmorris@intercode.com.au>
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify it
|
|
* under the terms of the GNU General Public License as published by the Free
|
|
* Software Foundation; either version 2 of the License, or (at your option)
|
|
* any later version.
|
|
*
|
|
*/
|
|
#include <linux/crypto.h>
|
|
#include <linux/mm.h>
|
|
#include <linux/errno.h>
|
|
#include <linux/highmem.h>
|
|
#include <asm/scatterlist.h>
|
|
#include "internal.h"
|
|
|
|
static void init(struct crypto_tfm *tfm)
|
|
{
|
|
tfm->__crt_alg->cra_digest.dia_init(crypto_tfm_ctx(tfm));
|
|
}
|
|
|
|
static void update(struct crypto_tfm *tfm,
|
|
struct scatterlist *sg, unsigned int nsg)
|
|
{
|
|
unsigned int i;
|
|
|
|
for (i = 0; i < nsg; i++) {
|
|
|
|
struct page *pg = sg[i].page;
|
|
unsigned int offset = sg[i].offset;
|
|
unsigned int l = sg[i].length;
|
|
|
|
do {
|
|
unsigned int bytes_from_page = min(l, ((unsigned int)
|
|
(PAGE_SIZE)) -
|
|
offset);
|
|
char *p = crypto_kmap(pg, 0) + offset;
|
|
|
|
tfm->__crt_alg->cra_digest.dia_update
|
|
(crypto_tfm_ctx(tfm), p,
|
|
bytes_from_page);
|
|
crypto_kunmap(p, 0);
|
|
crypto_yield(tfm);
|
|
offset = 0;
|
|
pg++;
|
|
l -= bytes_from_page;
|
|
} while (l > 0);
|
|
}
|
|
}
|
|
|
|
static void final(struct crypto_tfm *tfm, u8 *out)
|
|
{
|
|
tfm->__crt_alg->cra_digest.dia_final(crypto_tfm_ctx(tfm), out);
|
|
}
|
|
|
|
static int setkey(struct crypto_tfm *tfm, const u8 *key, unsigned int keylen)
|
|
{
|
|
u32 flags;
|
|
if (tfm->__crt_alg->cra_digest.dia_setkey == NULL)
|
|
return -ENOSYS;
|
|
return tfm->__crt_alg->cra_digest.dia_setkey(crypto_tfm_ctx(tfm),
|
|
key, keylen, &flags);
|
|
}
|
|
|
|
static void digest(struct crypto_tfm *tfm,
|
|
struct scatterlist *sg, unsigned int nsg, u8 *out)
|
|
{
|
|
unsigned int i;
|
|
|
|
tfm->crt_digest.dit_init(tfm);
|
|
|
|
for (i = 0; i < nsg; i++) {
|
|
char *p = crypto_kmap(sg[i].page, 0) + sg[i].offset;
|
|
tfm->__crt_alg->cra_digest.dia_update(crypto_tfm_ctx(tfm),
|
|
p, sg[i].length);
|
|
crypto_kunmap(p, 0);
|
|
crypto_yield(tfm);
|
|
}
|
|
crypto_digest_final(tfm, out);
|
|
}
|
|
|
|
int crypto_init_digest_flags(struct crypto_tfm *tfm, u32 flags)
|
|
{
|
|
return flags ? -EINVAL : 0;
|
|
}
|
|
|
|
int crypto_init_digest_ops(struct crypto_tfm *tfm)
|
|
{
|
|
struct digest_tfm *ops = &tfm->crt_digest;
|
|
|
|
ops->dit_init = init;
|
|
ops->dit_update = update;
|
|
ops->dit_final = final;
|
|
ops->dit_digest = digest;
|
|
ops->dit_setkey = setkey;
|
|
|
|
return crypto_alloc_hmac_block(tfm);
|
|
}
|
|
|
|
void crypto_exit_digest_ops(struct crypto_tfm *tfm)
|
|
{
|
|
crypto_free_hmac_block(tfm);
|
|
}
|