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/*
* Copyright (C) 2010 Martin Willi
* Copyright (C) 2010 revosec AG
*
* 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. See <http://www.fsf.org/copyleft/gpl.txt>.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* for more details.
*/
#include "af_alg_hasher.h"
#include <unistd.h>
#include <errno.h>
#include <linux/socket.h>
#include <linux/if_alg.h>
#include <debug.h>
#ifndef AF_ALG
#define AF_ALG 38
#endif /* AF_ALG */
typedef struct private_af_alg_hasher_t private_af_alg_hasher_t;
/**
* Private data of af_alg_hasher_t
*/
struct private_af_alg_hasher_t {
/**
* Public part of this class.
*/
af_alg_hasher_t public;
/**
* Transform fd
*/
int tfm;
/**
* Current operation fd, -1 if none
*/
int op;
/**
* Size of the hash
*/
size_t size;
};
/**
* Get the kernel algorithm string and hash size for our identifier
*/
static size_t lookup_alg(hash_algorithm_t algo, char *name)
{
static struct {
hash_algorithm_t id;
char *name;
size_t size;
} algs[] = {
{HASH_MD4 , "md4", HASH_SIZE_MD4 },
{HASH_MD5 , "md5", HASH_SIZE_MD5 },
{HASH_SHA1, "sha1", HASH_SIZE_SHA1 },
{HASH_SHA224, "sha224", HASH_SIZE_SHA224 },
{HASH_SHA256, "sha256", HASH_SIZE_SHA256 },
{HASH_SHA384, "sha384", HASH_SIZE_SHA384 },
{HASH_SHA512, "sha512", HASH_SIZE_SHA512 },
};
int i;
for (i = 0; i < countof(algs); i++)
{
if (algs[i].id == algo)
{
strcpy(name, algs[i].name);
return algs[i].size;
}
}
return 0;
}
METHOD(hasher_t, get_hash_size, size_t,
private_af_alg_hasher_t *this)
{
return this->size;
}
METHOD(hasher_t, reset, void,
private_af_alg_hasher_t *this)
{
if (this->op != -1)
{
close(this->op);
this->op = -1;
}
}
METHOD(hasher_t, get_hash, void,
private_af_alg_hasher_t *this, chunk_t chunk, u_int8_t *hash)
{
ssize_t len;
while (this->op == -1)
{
this->op = accept(this->tfm, NULL, 0);
if (this->op == -1)
{
DBG1(DBG_LIB, "opening AF_ALG hasher failed: %s", strerror(errno));
sleep(1);
}
}
do
{
len = send(this->op, chunk.ptr, chunk.len, hash ? 0 : MSG_MORE);
if (len == -1)
{
DBG1(DBG_LIB, "writing to AF_ALG hasher failed: %s", strerror(errno));
sleep(1);
}
else
{
chunk = chunk_skip(chunk, len);
}
}
while (chunk.len);
if (hash)
{
while (read(this->op, hash, this->size) != this->size)
{
DBG1(DBG_LIB, "reading AF_ALG hasher failed: %s", strerror(errno));
sleep(1);
}
reset(this);
}
}
METHOD(hasher_t, allocate_hash, void,
private_af_alg_hasher_t *this, chunk_t chunk, chunk_t *hash)
{
if (hash)
{
*hash = chunk_alloc(get_hash_size(this));
get_hash(this, chunk, hash->ptr);
}
else
{
get_hash(this, chunk, NULL);
}
}
METHOD(hasher_t, destroy, void,
private_af_alg_hasher_t *this)
{
if (this->op != -1)
{
close(this->op);
}
close(this->tfm);
free(this);
}
/*
* Described in header
*/
af_alg_hasher_t *af_alg_hasher_create(hash_algorithm_t algo)
{
private_af_alg_hasher_t *this;
struct sockaddr_alg sa = {
.salg_family = AF_ALG,
.salg_type = "hash",
};
size_t size;
size = lookup_alg(algo, sa.salg_name);
if (!size)
{ /* not supported by kernel */
return NULL;
}
INIT(this,
.public = {
.hasher = {
.get_hash = _get_hash,
.allocate_hash = _allocate_hash,
.get_hash_size = _get_hash_size,
.reset = _reset,
.destroy = _destroy,
},
},
.tfm = socket(AF_ALG, SOCK_SEQPACKET, 0),
.op = -1,
.size = size,
);
if (this->tfm == -1)
{
DBG1(DBG_LIB, "opening AF_ALG socket failed: %s", strerror(errno));
free(this);
return NULL;
}
if (bind(this->tfm, (struct sockaddr*)&sa, sizeof(sa)) == -1)
{
DBG1(DBG_LIB, "binding AF_ALG socket for '%s' failed: %s",
sa.salg_name, strerror(errno));
destroy(this);
return NULL;
}
return &this->public;
}
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