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liberasurecode
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liberasurecode/src/backends/shss/shss.c

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/*
* Copyright(c) 2015 NTT corp. All Rights Reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* Redistributions of source code must retain the above copyright notice, this
* list of conditions and the following disclaimer.
*
* Redistributions in binary form must reproduce the above copyright notice, this
* list of conditions and the following disclaimer in the documentation and/or
* other materials provided with the distribution. THIS SOFTWARE IS PROVIDED BY
* THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
* EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;LOSS OF USE,
* DATA, OR PROFITS;OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
* OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* liberasurecode shss backend
*
* Please contact us if you are insterested in the NTT backend (welcome!):
* Kota Tsuyuzaki <tsuyuzaki.kota@lab.ntt.co.jp>
*
* vi: set noai tw=79 ts=4 sw=4:
*/
#include <stdio.h>
#include <stdlib.h>
#include "erasurecode.h"
#include "erasurecode_helpers.h"
#include "erasurecode_backend.h"
/* Forward declarations */
struct ec_backend shss;
struct ec_backend_op_stubs shss_ops;
struct ec_backend_common backend_shss;
typedef int (*shss_encode_func)(char **, size_t, int, int, int, int, long long *);
typedef int (*shss_decode_func)(char **, size_t, int *, int, int, int, int, int, long long *);
typedef int (*shss_reconstruct_func)(char **, size_t, int *, int, int *, int, int, int, int, int, long long *);
struct shss_descriptor {
/* calls required for init */
shss_encode_func ssencode;
shss_decode_func ssdecode;
shss_reconstruct_func ssreconst;
/* fields needed to hold state */
int k;
int m;
int n;
int w;
int aes_bit_length;
};
#define SHSS_LIB_VER_STR "1.0"
#define SHSS_LIB_NAME "shss"
#if defined(__MACOS__) || defined(__MACOSX__) || defined(__OSX__) || defined(__APPLE__)
#define SHSS_SO_NAME "libshss.dylib"
#else
#define SHSS_SO_NAME "libshss.so"
#endif
#define DEFAULT_W 128
#define METADATA 32
static int shss_encode(void *desc, char **data, char **parity,
int blocksize)
{
int i;
int ret = 0;
int priv_bitnum = 128; // privacy bit number 0 or 128(default) or 256
int chksum = 0; // chksum 0 or 64
char **encoded;
long long einfo;
struct shss_descriptor *xdesc =
(struct shss_descriptor *) desc;
if (xdesc->aes_bit_length != -1) {
priv_bitnum = xdesc->aes_bit_length;
}
encoded = alloca(sizeof(char*)*xdesc->n);
for (i = 0; i<xdesc->k; i++) encoded[i] = (char*)data[i];
for (i = 0; i<xdesc->m; i++) encoded[i+xdesc->k] = (char*)parity[i];
ret = xdesc->ssencode((char**)encoded, (size_t)blocksize,
xdesc->k, xdesc->m, priv_bitnum, chksum, &einfo);
if (ret > 0) {
return -ret;
}
return 0;
}
static int shss_decode(void *desc, char **data, char **parity,
int *missing_idxs, int blocksize)
{
int i;
int missing_size = 0;
int ret = 0;
int priv_bitnum = 128; // privacy bit number 0 or 128(default) or 256
int chksum = 0; // chksum 0 or 64
char **decoded;
long long einfo;
struct shss_descriptor *xdesc =
(struct shss_descriptor *) desc;
if (xdesc->aes_bit_length != -1) {
priv_bitnum = xdesc->aes_bit_length;
}
decoded = alloca(sizeof(char*)*xdesc->n);
for (i = 0; i<xdesc->k; i++) decoded[i] = (char*)data[i];
for (i = 0; i<xdesc->m; i++) decoded[i+xdesc->k] = (char*)parity[i];
for (i = 0; i<xdesc->n; i++) {
if (i == missing_idxs[missing_size]) {
missing_size++;
}
}
ret = xdesc->ssdecode((char**)decoded, (size_t)blocksize, missing_idxs, missing_size,
xdesc->k, xdesc->m, priv_bitnum, chksum, &einfo);
if (ret > 0) {
return -ret;
}
return 0;
}
static int shss_reconstruct(void *desc, char **data, char **parity,
int *missing_idxs, int destination_idx, int blocksize)
{
int i;
int missing_size = 0;
int ret = 0;
int priv_bitnum = 128; // privacy bit number 0 or 128(default) or 256
int chksum = 0; // chksum 0 or 64
int dst_size = 1;
char **reconstructed;
long long einfo;
struct shss_descriptor *xdesc =
(struct shss_descriptor *) desc;
if (xdesc->aes_bit_length != -1) {
priv_bitnum = xdesc->aes_bit_length;
}
reconstructed = alloca(sizeof(char*)*xdesc->n);
for (i = 0; i<xdesc->k; i++) reconstructed[i] = (char*)data[i];
for (i = 0; i<xdesc->m; i++) reconstructed[i+xdesc->k] = (char*)parity[i];
for (i = 0; i<xdesc->n; i++) {
if (i == missing_idxs[missing_size]) {
missing_size++;
}
}
ret = xdesc->ssreconst((char**)reconstructed, (size_t)blocksize,
&destination_idx, dst_size, missing_idxs, missing_size, xdesc->k,
xdesc->m, priv_bitnum, chksum, &einfo);
if (ret > 0) {
return -ret;
}
return 0;
}
static int shss_fragments_needed(void *desc, int *missing_idxs,
int *fragments_to_exclude, int *fragments_needed)
{
struct shss_descriptor *xdesc =
(struct shss_descriptor *) desc;
uint64_t exclude_bm = convert_list_to_bitmap(fragments_to_exclude);
uint64_t missing_bm = convert_list_to_bitmap(missing_idxs) | exclude_bm;
int i;
int j = 0;
int ret = -101;
for (i = 0; i < xdesc->n; i++) {
if (!(missing_bm & (1 << i))) {
fragments_needed[j] = i;
j++;
}
if (j == xdesc->k) {
ret = 0;
fragments_needed[j] = -1;
break;
}
}
return ret;
}
/**
* Return the element-size, which is the number of bits stored
* on a given device, per codeword. This is usually just 'w'.
*/
static int shss_element_size(void* desc)
{
return DEFAULT_W;
}
static void * shss_init(struct ec_backend_args *args, void *backend_sohandle)
{
struct shss_descriptor *desc = NULL;
desc = (struct shss_descriptor *)
malloc(sizeof(struct shss_descriptor));
if (NULL == desc) {
return NULL;
}
desc->k = args->uargs.k;
desc->m = args->uargs.m;
desc->n = args->uargs.k + args->uargs.m;
desc->w = DEFAULT_W;
args->uargs.w = DEFAULT_W;
/* Sample on how to pass extra args to the backend */
// TODO: Need discussion how to pass extra args.
// tentatively we could pass with priv_args2 as the bit_length
int *priv = (int *)args->uargs.priv_args2;
if(priv != NULL){
desc->aes_bit_length = priv[0]; // AES bit number
}else{
desc->aes_bit_length = 128;
}
union {
shss_encode_func encodep;
shss_decode_func decodep;
shss_reconstruct_func reconp;
void *vptr;
} func_handle;
func_handle.vptr = NULL;
func_handle.vptr = dlsym(backend_sohandle, "ssencode");
desc->ssencode = func_handle.encodep;
if (NULL == desc->ssencode) {
goto error;
}
func_handle.vptr = NULL;
func_handle.vptr = dlsym(backend_sohandle, "ssdecode");
desc->ssdecode = func_handle.decodep;
if (NULL == desc->ssdecode) {
goto error;
}
func_handle.vptr = NULL;
func_handle.vptr = dlsym(backend_sohandle, "ssreconst");
desc->ssreconst = func_handle.reconp;
if (NULL == desc->ssreconst) {
goto error;
}
return desc;
error:
free(desc);
return NULL;
}
static int shss_exit(void *desc)
{
if (desc != NULL) {
free(desc);
}
return 0;
}
static bool shss_is_compatible_with(uint32_t version) {
return version == backend_shss.ec_backend_version;
}
struct ec_backend_op_stubs shss_op_stubs = {
.INIT = shss_init,
.EXIT = shss_exit,
.ENCODE = shss_encode,
.DECODE = shss_decode,
.FRAGSNEEDED = shss_fragments_needed,
.RECONSTRUCT = shss_reconstruct,
.ELEMENTSIZE = shss_element_size,
.ISCOMPATIBLEWITH = shss_is_compatible_with,
};
struct ec_backend_common backend_shss = {
.id = EC_BACKEND_SHSS,
.name = SHSS_LIB_NAME,
.soname = SHSS_SO_NAME,
.soversion = SHSS_LIB_VER_STR,
.ops = &shss_op_stubs,
.metadata_adder = METADATA,
};
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