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/*
* Copyright (C) 2008 Thomas Kallenberg
* Copyright (C) 2008 Martin Willi
* Hochschule fuer Technik Rapperswil
*
* 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.
*
* $Id$
*/
#include <string.h>
#include <arpa/inet.h>
#include <byteswap.h>
#include "padlock_sha1_hasher.h"
#define PADLOCK_ALIGN __attribute__ ((__aligned__(16)))
typedef struct private_padlock_sha1_hasher_t private_padlock_sha1_hasher_t;
/**
* Private data structure with hasing context.
*/
struct private_padlock_sha1_hasher_t {
/**
* Public interface for this hasher.
*/
padlock_sha1_hasher_t public;
/**
* data collected to hash
*/
chunk_t data;
};
/**
* Invoke the actual padlock sha1() operation
*/
static void padlock_sha1(int len, u_char *in, u_char *out)
{
/* rep xsha1 */
asm volatile (
".byte 0xf3, 0x0f, 0xa6, 0xc8"
: "+S"(in), "+D"(out)
: "c"(len), "a"(0));
}
/**
* sha1() a buffer of data into digest
*/
static void sha1(chunk_t data, u_int32_t *digest)
{
u_int32_t hash[128] PADLOCK_ALIGN;
hash[0] = 0x67452301;
hash[1] = 0xefcdab89;
hash[2] = 0x98badcfe;
hash[3] = 0x10325476;
hash[4] = 0xc3d2e1f0;
padlock_sha1(data.len, data.ptr, (u_char*)hash);
digest[0] = bswap_32(hash[0]);
digest[1] = bswap_32(hash[1]);
digest[2] = bswap_32(hash[2]);
digest[3] = bswap_32(hash[3]);
digest[4] = bswap_32(hash[4]);
}
/**
* append data to the to-be-hashed buffer
*/
static void append_data(private_padlock_sha1_hasher_t *this, chunk_t data)
{
this->data.ptr = realloc(this->data.ptr, this->data.len + data.len);
memcpy(this->data.ptr + this->data.len, data.ptr, data.len);
this->data.len += data.len;
}
/**
* Implementation of hasher_t.reset.
*/
static void reset(private_padlock_sha1_hasher_t *this)
{
chunk_free(&this->data);
}
/**
* Implementation of hasher_t.get_hash.
*/
static void get_hash(private_padlock_sha1_hasher_t *this, chunk_t chunk,
u_int8_t *hash)
{
if (hash)
{
if (this->data.len)
{
append_data(this, chunk);
sha1(this->data, (u_int32_t*)hash);
}
else
{ /* hash directly if no previous data found */
sha1(chunk, (u_int32_t*)hash);
}
reset(this);
}
else
{
append_data(this, chunk);
}
}
/**
* Implementation of hasher_t.allocate_hash.
*/
static void allocate_hash(private_padlock_sha1_hasher_t *this, chunk_t chunk,
chunk_t *hash)
{
if (hash)
{
*hash = chunk_alloc(HASH_SIZE_SHA1);
get_hash(this, chunk, hash->ptr);
}
else
{
get_hash(this, chunk, NULL);
}
}
/**
* Implementation of hasher_t.get_hash_size.
*/
static size_t get_hash_size(private_padlock_sha1_hasher_t *this)
{
return HASH_SIZE_SHA1;
}
/**
* Implementation of hasher_t.destroy.
*/
static void destroy(private_padlock_sha1_hasher_t *this)
{
free(this->data.ptr);
free(this);
}
/*
* Described in header.
*/
padlock_sha1_hasher_t *padlock_sha1_hasher_create(hash_algorithm_t algo)
{
private_padlock_sha1_hasher_t *this;
if (algo != HASH_SHA1)
{
return NULL;
}
this = malloc_thing(private_padlock_sha1_hasher_t);
this->public.hasher_interface.get_hash = (void (*) (hasher_t*, chunk_t, u_int8_t*))get_hash;
this->public.hasher_interface.allocate_hash = (void (*) (hasher_t*, chunk_t, chunk_t*))allocate_hash;
this->public.hasher_interface.get_hash_size = (size_t (*) (hasher_t*))get_hash_size;
this->public.hasher_interface.reset = (void (*) (hasher_t*))reset;
this->public.hasher_interface.destroy = (void (*) (hasher_t*))destroy;
this->data = chunk_empty;
return &(this->public);
}
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