linux/crypto/digest.c
Herbert Xu 18e33e6d5c crypto: hash - Move ahash functions into crypto/hash.h
All new crypto interfaces should go into individual files as much
as possible in order to ensure that crypto.h does not collapse under
its own weight.

This patch moves the ahash code into crypto/hash.h and crypto/internal/hash.h
respectively.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
2008-07-10 20:35:18 +08:00

240 lines
5.7 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 <crypto/internal/hash.h>
#include <crypto/scatterwalk.h>
#include <linux/mm.h>
#include <linux/errno.h>
#include <linux/hardirq.h>
#include <linux/highmem.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/scatterlist.h>
#include "internal.h"
static int init(struct hash_desc *desc)
{
struct crypto_tfm *tfm = crypto_hash_tfm(desc->tfm);
tfm->__crt_alg->cra_digest.dia_init(tfm);
return 0;
}
static int update2(struct hash_desc *desc,
struct scatterlist *sg, unsigned int nbytes)
{
struct crypto_tfm *tfm = crypto_hash_tfm(desc->tfm);
unsigned int alignmask = crypto_tfm_alg_alignmask(tfm);
if (!nbytes)
return 0;
for (;;) {
struct page *pg = sg_page(sg);
unsigned int offset = sg->offset;
unsigned int l = sg->length;
if (unlikely(l > nbytes))
l = nbytes;
nbytes -= l;
do {
unsigned int bytes_from_page = min(l, ((unsigned int)
(PAGE_SIZE)) -
offset);
char *src = crypto_kmap(pg, 0);
char *p = src + offset;
if (unlikely(offset & alignmask)) {
unsigned int bytes =
alignmask + 1 - (offset & alignmask);
bytes = min(bytes, bytes_from_page);
tfm->__crt_alg->cra_digest.dia_update(tfm, p,
bytes);
p += bytes;
bytes_from_page -= bytes;
l -= bytes;
}
tfm->__crt_alg->cra_digest.dia_update(tfm, p,
bytes_from_page);
crypto_kunmap(src, 0);
crypto_yield(desc->flags);
offset = 0;
pg++;
l -= bytes_from_page;
} while (l > 0);
if (!nbytes)
break;
sg = scatterwalk_sg_next(sg);
}
return 0;
}
static int update(struct hash_desc *desc,
struct scatterlist *sg, unsigned int nbytes)
{
if (WARN_ON_ONCE(in_irq()))
return -EDEADLK;
return update2(desc, sg, nbytes);
}
static int final(struct hash_desc *desc, u8 *out)
{
struct crypto_tfm *tfm = crypto_hash_tfm(desc->tfm);
unsigned long alignmask = crypto_tfm_alg_alignmask(tfm);
struct digest_alg *digest = &tfm->__crt_alg->cra_digest;
if (unlikely((unsigned long)out & alignmask)) {
unsigned long align = alignmask + 1;
unsigned long addr = (unsigned long)crypto_tfm_ctx(tfm);
u8 *dst = (u8 *)ALIGN(addr, align) +
ALIGN(tfm->__crt_alg->cra_ctxsize, align);
digest->dia_final(tfm, dst);
memcpy(out, dst, digest->dia_digestsize);
} else
digest->dia_final(tfm, out);
return 0;
}
static int nosetkey(struct crypto_hash *tfm, const u8 *key, unsigned int keylen)
{
crypto_hash_clear_flags(tfm, CRYPTO_TFM_RES_MASK);
return -ENOSYS;
}
static int setkey(struct crypto_hash *hash, const u8 *key, unsigned int keylen)
{
struct crypto_tfm *tfm = crypto_hash_tfm(hash);
crypto_hash_clear_flags(hash, CRYPTO_TFM_RES_MASK);
return tfm->__crt_alg->cra_digest.dia_setkey(tfm, key, keylen);
}
static int digest(struct hash_desc *desc,
struct scatterlist *sg, unsigned int nbytes, u8 *out)
{
if (WARN_ON_ONCE(in_irq()))
return -EDEADLK;
init(desc);
update2(desc, sg, nbytes);
return final(desc, out);
}
int crypto_init_digest_ops(struct crypto_tfm *tfm)
{
struct hash_tfm *ops = &tfm->crt_hash;
struct digest_alg *dalg = &tfm->__crt_alg->cra_digest;
if (dalg->dia_digestsize > PAGE_SIZE / 8)
return -EINVAL;
ops->init = init;
ops->update = update;
ops->final = final;
ops->digest = digest;
ops->setkey = dalg->dia_setkey ? setkey : nosetkey;
ops->digestsize = dalg->dia_digestsize;
return 0;
}
void crypto_exit_digest_ops(struct crypto_tfm *tfm)
{
}
static int digest_async_nosetkey(struct crypto_ahash *tfm_async, const u8 *key,
unsigned int keylen)
{
crypto_ahash_clear_flags(tfm_async, CRYPTO_TFM_RES_MASK);
return -ENOSYS;
}
static int digest_async_setkey(struct crypto_ahash *tfm_async, const u8 *key,
unsigned int keylen)
{
struct crypto_tfm *tfm = crypto_ahash_tfm(tfm_async);
struct digest_alg *dalg = &tfm->__crt_alg->cra_digest;
crypto_ahash_clear_flags(tfm_async, CRYPTO_TFM_RES_MASK);
return dalg->dia_setkey(tfm, key, keylen);
}
static int digest_async_init(struct ahash_request *req)
{
struct crypto_tfm *tfm = req->base.tfm;
struct digest_alg *dalg = &tfm->__crt_alg->cra_digest;
dalg->dia_init(tfm);
return 0;
}
static int digest_async_update(struct ahash_request *req)
{
struct crypto_tfm *tfm = req->base.tfm;
struct hash_desc desc = {
.tfm = __crypto_hash_cast(tfm),
.flags = req->base.flags,
};
update(&desc, req->src, req->nbytes);
return 0;
}
static int digest_async_final(struct ahash_request *req)
{
struct crypto_tfm *tfm = req->base.tfm;
struct hash_desc desc = {
.tfm = __crypto_hash_cast(tfm),
.flags = req->base.flags,
};
final(&desc, req->result);
return 0;
}
static int digest_async_digest(struct ahash_request *req)
{
struct crypto_tfm *tfm = req->base.tfm;
struct hash_desc desc = {
.tfm = __crypto_hash_cast(tfm),
.flags = req->base.flags,
};
return digest(&desc, req->src, req->nbytes, req->result);
}
int crypto_init_digest_ops_async(struct crypto_tfm *tfm)
{
struct ahash_tfm *crt = &tfm->crt_ahash;
struct digest_alg *dalg = &tfm->__crt_alg->cra_digest;
if (dalg->dia_digestsize > crypto_tfm_alg_blocksize(tfm))
return -EINVAL;
crt->init = digest_async_init;
crt->update = digest_async_update;
crt->final = digest_async_final;
crt->digest = digest_async_digest;
crt->setkey = dalg->dia_setkey ? digest_async_setkey :
digest_async_nosetkey;
crt->digestsize = dalg->dia_digestsize;
return 0;
}