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/*
* Cryptographic Hash operations.
*
* Copyright (c) 2006 Herbert Xu <herbert@gondor.apana.org.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/errno.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/seq_file.h>
#include "internal.h"
static unsigned int crypto_hash_ctxsize(struct crypto_alg *alg, u32 type,
u32 mask)
{
return alg->cra_ctxsize;
}
static int hash_setkey_unaligned(struct crypto_hash *crt, const u8 *key,
unsigned int keylen)
{
struct crypto_tfm *tfm = crypto_hash_tfm(crt);
struct hash_alg *alg = &tfm->__crt_alg->cra_hash;
unsigned long alignmask = crypto_hash_alignmask(crt);
int ret;
u8 *buffer, *alignbuffer;
unsigned long absize;
absize = keylen + alignmask;
buffer = kmalloc(absize, GFP_ATOMIC);
if (!buffer)
return -ENOMEM;
alignbuffer = (u8 *)ALIGN((unsigned long)buffer, alignmask + 1);
memcpy(alignbuffer, key, keylen);
ret = alg->setkey(crt, alignbuffer, keylen);
memset(alignbuffer, 0, keylen);
kfree(buffer);
return ret;
}
static int hash_setkey(struct crypto_hash *crt, const u8 *key,
unsigned int keylen)
{
struct crypto_tfm *tfm = crypto_hash_tfm(crt);
struct hash_alg *alg = &tfm->__crt_alg->cra_hash;
unsigned long alignmask = crypto_hash_alignmask(crt);
if ((unsigned long)key & alignmask)
return hash_setkey_unaligned(crt, key, keylen);
return alg->setkey(crt, key, keylen);
}
static int crypto_init_hash_ops(struct crypto_tfm *tfm, u32 type, u32 mask)
{
struct hash_tfm *crt = &tfm->crt_hash;
struct hash_alg *alg = &tfm->__crt_alg->cra_hash;
if (alg->digestsize > crypto_tfm_alg_blocksize(tfm))
return -EINVAL;
crt->init = alg->init;
crt->update = alg->update;
crt->final = alg->final;
crt->digest = alg->digest;
crt->setkey = hash_setkey;
crt->digestsize = alg->digestsize;
return 0;
}
static void crypto_hash_show(struct seq_file *m, struct crypto_alg *alg)
__attribute__ ((unused));
static void crypto_hash_show(struct seq_file *m, struct crypto_alg *alg)
{
seq_printf(m, "type : hash\n");
seq_printf(m, "blocksize : %u\n", alg->cra_blocksize);
seq_printf(m, "digestsize : %u\n", alg->cra_hash.digestsize);
}
const struct crypto_type crypto_hash_type = {
.ctxsize = crypto_hash_ctxsize,
.init = crypto_init_hash_ops,
#ifdef CONFIG_PROC_FS
.show = crypto_hash_show,
#endif
};
EXPORT_SYMBOL_GPL(crypto_hash_type);
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("Generic cryptographic hash type");
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