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ec_utils.c
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/*
* Copyright (C) 2017 - This file is part of libecc project
*
* Authors:
* Ryad BENADJILA <[email protected]>
* Arnaud EBALARD <[email protected]>
* Jean-Pierre FLORI <[email protected]>
*
* Contributors:
* Nicolas VIVET <[email protected]>
* Karim KHALFALLAH <[email protected]>
*
* This software is licensed under a dual BSD and GPL v2 license.
* See LICENSE file at the root folder of the project.
*/
#include "../libsig.h"
#ifdef WITH_STDLIB
#include <string.h>
#include <stdlib.h>
#include <stdio.h>
#include <errno.h>
#endif
#define HDR_MAGIC 0x34215609
typedef enum {
IMAGE_TYPE_UNKNOWN = 0,
IMAGE_TYPE0 = 1,
IMAGE_TYPE1 = 2,
IMAGE_TYPE2 = 3,
IMAGE_TYPE3 = 4,
/* Info: You can add more image header types */
} image_type;
/* Generic header to prepend data */
typedef struct {
u32 magic; /* header header */
u32 type; /* Type of the signed image */
u32 version; /* Version */
u32 len; /* length of data after header */
u32 siglen; /* length of sig (on header + data) */
} ATTRIBUTE_PACKED metadata_hdr;
/* Max stack working buffer size */
#define MAX_BUF_LEN 8192
typedef enum {
RAWBIN,
DOTH,
} export_file_type;
ATTRIBUTE_WARN_UNUSED_RET static int export_private_key(FILE * file, const char *name,
const ec_priv_key *priv_key,
export_file_type file_type)
{
u8 export_buf_size, priv_key_buf[EC_STRUCTURED_PRIV_KEY_MAX_EXPORT_SIZE];
size_t written;
int ret;
u32 i;
MUST_HAVE(file != NULL, ret, err);
ret = priv_key_check_initialized(priv_key);
if (ret) {
printf("Error checking private key\n");
ret = -1;
goto err;
}
/* Serialize the private key to a buffer */
export_buf_size = EC_STRUCTURED_PRIV_KEY_EXPORT_SIZE(priv_key);
ret = ec_structured_priv_key_export_to_buf(priv_key, priv_key_buf,
export_buf_size);
if (ret) {
printf("Error exporting private key to buffer\n");
ret = -1;
goto err;
}
/* Export the private key to the file */
switch (file_type) {
case DOTH:
MUST_HAVE(name != NULL, ret, err);
fprintf(file, "const char %s[] = { ", name);
for (i = 0; i < export_buf_size; i++) {
fprintf(file, "0x%02x", priv_key_buf[i]);
fprintf(file, ", ");
}
fprintf(file, "};\n");
ret = 0;
break;
case RAWBIN:
written = fwrite(priv_key_buf, 1, export_buf_size, file);
if(written != export_buf_size){
ret = -1;
goto err;
}
ret = 0;
break;
default:
ret = -1;
}
err:
return ret;
}
ATTRIBUTE_WARN_UNUSED_RET static int export_public_key(FILE * file, const char *name,
const ec_pub_key *pub_key,
export_file_type file_type)
{
u8 pub_key_buf[EC_STRUCTURED_PUB_KEY_MAX_EXPORT_SIZE];
u8 export_buf_size;
int ret;
u32 i;
size_t written;
MUST_HAVE(file != NULL, ret, err);
ret = pub_key_check_initialized(pub_key);
if (ret) {
printf("Error checking public key\n");
ret = -1;
goto err;
}
/* Serialize the public key to a buffer */
export_buf_size = EC_STRUCTURED_PUB_KEY_EXPORT_SIZE(pub_key);
ret = ec_structured_pub_key_export_to_buf(pub_key, pub_key_buf,
export_buf_size);
if (ret) {
printf("Error exporting public key to buffer\n");
ret = -1;
goto err;
}
/* Export the public key to the file */
switch (file_type) {
case DOTH:
MUST_HAVE(name != NULL, ret, err);
fprintf(file, "const char %s[] = { ", name);
for (i = 0; i < export_buf_size; i++) {
fprintf(file, "0x%02x", pub_key_buf[i]);
if (i != export_buf_size) {
fprintf(file, ", ");
}
}
fprintf(file, "};\n");
ret = 0;
break;
case RAWBIN:
written = fwrite(pub_key_buf, 1, export_buf_size, file);
if(written != export_buf_size){
ret = -1;
goto err;
}
ret = 0;
break;
default:
ret = -1;
}
err:
return ret;
}
ATTRIBUTE_WARN_UNUSED_RET static int string_to_params(const char *ec_name, const char *ec_sig_name,
ec_alg_type * sig_type,
const ec_str_params ** ec_str_p,
const char *hash_name, hash_alg_type * hash_type)
{
const ec_str_params *curve_params;
const ec_sig_mapping *sm;
const hash_mapping *hm;
u32 curve_name_len;
int ret;
if (sig_type != NULL) {
/* Get sig type from signature alg name */
ret = get_sig_by_name(ec_sig_name, &sm);
if ((ret) || (!sm)) {
ret = -1;
printf("Error: signature type %s is unknown!\n",
ec_sig_name);
goto err;
}
*sig_type = sm->type;
}
if (ec_str_p != NULL) {
/* Get curve params from curve name */
ret = local_strlen((const char *)ec_name, &curve_name_len); EG(ret, err);
curve_name_len += 1;
if(curve_name_len > 255){
/* Sanity check */
ret = -1;
goto err;
}
ret = ec_get_curve_params_by_name((const u8 *)ec_name,
(u8)curve_name_len, &curve_params);
if ((ret) || (!curve_params)) {
ret = -1;
printf("Error: EC curve %s is unknown!\n", ec_name);
goto err;
}
*ec_str_p = curve_params;
}
if (hash_type != NULL) {
/* Get hash type from hash alg name */
ret = get_hash_by_name(hash_name, &hm);
if ((ret) || (!hm)) {
ret = -1;
printf("Error: hash function %s is unknown!\n",
hash_name);
goto err;
}
*hash_type = hm->type;
}
ret = 0;
err:
return ret;
}
ATTRIBUTE_WARN_UNUSED_RET static int generate_and_export_key_pair(const char *ec_name,
const char *ec_sig_name,
const char *fname_prefix)
{
const ec_str_params *ec_str_p;
char fname[MAX_BUF_LEN];
char kname[MAX_BUF_LEN];
const u16 fname_len = sizeof(fname);
const u16 kname_len = sizeof(kname);
u16 prefix_len;
u32 len;
ec_alg_type sig_type;
ec_params params;
ec_key_pair kp;
FILE *file = NULL;
int ret;
MUST_HAVE(ec_name != NULL, ret, err);
MUST_HAVE(fname_prefix != NULL, ret, err);
MUST_HAVE(ec_sig_name != NULL, ret, err);
/* Get parameters from pretty names */
ret = string_to_params(ec_name, ec_sig_name, &sig_type, &ec_str_p,
NULL, NULL);
if (ret) {
ret = -1;
printf("Error: error when importing params\n");
goto err;
}
/* Import the parameters */
ret = import_params(¶ms, ec_str_p); EG(ret, err);
/* Generate the key pair */
ret = ec_key_pair_gen(&kp, ¶ms, sig_type); EG(ret, err);
/* Get the unique affine equivalent representation of the projective point for the public key.
* This avoids ambiguity when exporting the point, and is mostly here
* for compatibility with external libraries.
*/
ret = prj_pt_unique(&(kp.pub_key.y), &(kp.pub_key.y)); EG(ret, err);
/*************************/
/* Export the private key to the raw binary file */
ret = local_strnlen(fname_prefix, fname_len, &len); EG(ret, err);
MUST_HAVE(len <= 0xffff, ret, err);
prefix_len = (u16)len;
ret = local_memset(fname, 0, fname_len); EG(ret, err);
ret = local_memcpy(fname, fname_prefix, prefix_len); EG(ret, err);
ret = local_strncat(fname, "_private_key.bin", (u32)(fname_len - prefix_len)); EG(ret, err);
file = fopen(fname, "w");
if (file == NULL) {
ret = -1;
printf("Error: file %s cannot be opened\n", fname);
goto err;
}
ret = export_private_key(file, NULL, &(kp.priv_key), RAWBIN);
if (ret) {
ret = -1;
printf("Error exporting the private key\n");
goto err;
}
ret = fclose(file); EG(ret, err);
file = NULL;
/* Export the private key to the .h file */
ret = local_memset(fname, 0, fname_len); EG(ret, err);
ret = local_memcpy(fname, fname_prefix, prefix_len); EG(ret, err);
ret = local_strncat(fname, "_private_key.h", (u32)(fname_len - prefix_len)); EG(ret, err);
file = fopen(fname, "w");
if (file == NULL) {
ret = -1;
printf("Error: file %s cannot be opened\n", fname);
goto err;
}
snprintf(kname, kname_len, "%s_%s_private_key", ec_name, ec_sig_name);
ret = export_private_key(file, kname, &(kp.priv_key), DOTH);
if (ret) {
ret = -1;
printf("Error: error exporting the private key\n");
goto err;
}
ret = fclose(file); EG(ret, err);
file = NULL;
/*************************/
/* Export the public key to the raw binary file */
ret = local_memset(fname, 0, fname_len); EG(ret, err);
ret = local_memcpy(fname, fname_prefix, prefix_len); EG(ret, err);
ret = local_strncat(fname, "_public_key.bin", (u32)(fname_len - prefix_len)); EG(ret, err);
file = fopen(fname, "w");
if (file == NULL) {
ret = -1;
printf("Error: file %s cannot be opened\n", fname);
goto err;
}
ret = export_public_key(file, NULL, &(kp.pub_key), RAWBIN);
if (ret) {
ret = -1;
printf("Error exporting the public key\n");
goto err;
}
ret = fclose(file); EG(ret, err);
file = NULL;
/* Export the public key to the .h file */
ret = local_memset(fname, 0, fname_len); EG(ret, err);
ret = local_memcpy(fname, fname_prefix, prefix_len); EG(ret, err);
ret = local_strncat(fname, "_public_key.h", (u32)(fname_len - prefix_len)); EG(ret, err);
file = fopen(fname, "w");
if (file == NULL) {
ret = -1;
printf("Error: file %s cannot be opened\n", fname);
goto err;
}
snprintf(kname, kname_len, "%s_%s_public_key", ec_name, ec_sig_name);
ret = export_public_key(file, kname, &(kp.pub_key), DOTH);
if (ret) {
ret = -1;
printf("Error exporting the public key\n");
goto err;
}
ret = fclose(file); EG(ret, err);
file = NULL;
ret = 0;
err:
if(file != NULL){
if(fclose(file)){
ret = -1;
}
}
return ret;
}
ATTRIBUTE_WARN_UNUSED_RET static int store_sig(const char *in_fname, const char *out_fname,
const u8 *sig, u32 siglen,
ec_alg_type sig_type, hash_alg_type hash_type,
const u8 curve_name[MAX_CURVE_NAME_LEN],
metadata_hdr * hdr)
{
FILE *in_file = NULL, *out_file = NULL;
u8 buf[MAX_BUF_LEN];
size_t read, written;
int ret;
MUST_HAVE((in_fname != NULL), ret, err);
MUST_HAVE((out_fname != NULL), ret, err);
MUST_HAVE((sig != NULL), ret, err);
MUST_HAVE((curve_name != NULL), ret, err);
MUST_HAVE((hdr != NULL), ret, err);
#if (MAX_BUF_LEN <= 255)
/* No need to check this is sizeof(buf) exceeds 256.
* (avoids -Werror,-Wtautological-constant-out-of-range-compare)
*/
MUST_HAVE(EC_STRUCTURED_SIG_EXPORT_SIZE(siglen) <= sizeof(buf), ret, err);
#endif
/* Import the data from the input file */
in_file = fopen(in_fname, "r");
if (in_file == NULL) {
ret = -1;
printf("Error: file %s cannot be opened\n", in_fname);
goto err;
}
out_file = fopen(out_fname, "w");
if (out_file == NULL) {
ret = -1;
printf("Error: file %s cannot be opened\n", out_fname);
goto err;
}
if (hdr != NULL) {
/* Write the metadata header as a prepending information */
written = fwrite(hdr, 1, sizeof(metadata_hdr), out_file);
if (written != sizeof(metadata_hdr)) {
ret = -1;
goto err;
}
}
while (1) {
read = fread(buf, 1, sizeof(buf), in_file);
written = fwrite(buf, 1, read, out_file);
if (written != read) {
ret = -1;
printf("Error: error when writing to %s\n",
out_fname);
goto err;
}
if (read != sizeof(buf)) {
if (feof(in_file)) {
/* EOF */
break;
} else {
ret = -1;
printf("Error: error when reading from %s\n",
in_fname);
goto err;
}
}
}
/* Compute the structured signature */
ret = ec_structured_sig_export_to_buf(sig, siglen, buf, sizeof(buf),
sig_type, hash_type, curve_name);
if (ret) {
ret = -1;
printf("Error: error when exporting signature to structured buffer\n");
goto err;
}
/* Store the signature buffer */
written =
fwrite(buf, 1, EC_STRUCTURED_SIG_EXPORT_SIZE(siglen),
out_file);
if (written != EC_STRUCTURED_SIG_EXPORT_SIZE(siglen)) {
ret = -1;
printf("Error: error when writing to %s\n", out_fname);
goto err;
}
ret = 0;
err:
if(in_file != NULL){
if(fclose(in_file)){
ret = -1;
}
}
if(out_file != NULL){
if(fclose(out_file)){
ret = -1;
}
}
return ret;
}
/* Get the raw size of a file */
ATTRIBUTE_WARN_UNUSED_RET static int get_file_size(const char *in_fname, size_t *outsz)
{
FILE *in_file = NULL;
long size;
int ret;
MUST_HAVE(outsz != NULL, ret, err);
MUST_HAVE(in_fname != NULL, ret, err);
*outsz = 0;
in_file = fopen(in_fname, "r");
if (in_file == NULL) {
ret = -1;
printf("Error: file %s cannot be opened\n", in_fname);
goto err;
}
/* Compute the size of the file */
if (fseek(in_file, 0L, SEEK_END)) {
ret = -1;
printf("Error: file %s cannot be seeked\n", in_fname);
goto err;
}
size = ftell(in_file);
if (size < 0) {
ret = -1;
printf("Error: cannot compute file %s size\n", in_fname);
goto err;
}
/* Check overflow */
if ((u64)size > (u64)(0xffffffff)) {
ret = -1;
printf("Error: file %s size %ld overflow (>= 2^32)\n",
in_fname, size);
goto err;
}
*outsz = (u32)size;
ret = 0;
err:
if(in_file != NULL){
if(fclose(in_file)){
ret = -1;
}
}
return ret;
}
/* Generate a proper handler from a given type and other information */
ATTRIBUTE_WARN_UNUSED_RET static int generate_metadata_hdr(metadata_hdr * hdr, const char *hdr_type,
const char *version, size_t len, u8 siglen)
{
unsigned long ver;
char *endptr; /* for strtoul() */
int ret, check;
MUST_HAVE((hdr != NULL), ret, err);
MUST_HAVE((hdr_type != NULL), ret, err);
MUST_HAVE((version != NULL), ret, err);
/* The magic value */
hdr->magic = HDR_MAGIC;
/* The given version */
#ifdef WITH_STDLIB
errno = 0;
#endif
ver = strtoul(version, &endptr, 0);
#ifdef WITH_STDLIB
if(errno){
ret = -1;
printf("Error: error in strtoul\n");
goto err;
}
#endif
if (*endptr != '\0') {
ret = -1;
printf("Error: error getting provided version %s\n", version);
goto err;
}
if ((ver & 0xffffffff) != ver) {
ret = -1;
printf("Error: provided version %s is too long!\n", version);
goto err;
}
hdr->version = (u32)ver;
/* The image type */
hdr->type = IMAGE_TYPE_UNKNOWN;
ret = are_str_equal(hdr_type, "IMAGE_TYPE0", &check); EG(ret, err);
if (check) {
hdr->type = IMAGE_TYPE0;
}
ret = are_str_equal(hdr_type, "IMAGE_TYPE1", &check); EG(ret, err);
if (check) {
hdr->type = IMAGE_TYPE1;
}
ret = are_str_equal(hdr_type, "IMAGE_TYPE2", &check); EG(ret, err);
if (check) {
hdr->type = IMAGE_TYPE2;
}
ret = are_str_equal(hdr_type, "IMAGE_TYPE3", &check); EG(ret, err);
if (check) {
hdr->type = IMAGE_TYPE3;
}
if (hdr->type == IMAGE_TYPE_UNKNOWN) {
ret = -1;
printf("Error: unknown header type %s\n", hdr_type);
goto err;
}
/* The length without the signature */
if ((len & 0xffffffff) != len) {
ret = -1;
printf("Error: provided length value %lu is too long!\n", (unsigned long)len);
goto err;
}
hdr->len = (u32)len;
/* The signature length */
hdr->siglen = siglen;
ret = 0;
err:
return ret;
}
/* Warn the user that the provided ancillary data won't be used
* if the algorithm does not need them.
*/
ATTRIBUTE_WARN_UNUSED_RET static int check_ancillary_data(const char *adata, ec_alg_type sig_type, const char *sig_name, int *check)
{
int ret;
MUST_HAVE(check != NULL, ret, err);
MUST_HAVE(adata != NULL, ret, err);
MUST_HAVE(sig_name != NULL, ret, err);
MUST_HAVE(sig_type != UNKNOWN_ALG, ret, err);
(*check) = 0;
#if defined(WITH_SIG_EDDSA25519)
if(sig_type == EDDSA25519CTX){
(*check) = 1;
}
#endif
#if defined(WITH_SIG_EDDSA448)
if(sig_type == EDDSA448){
(*check) = 1;
}
#endif
#if defined(WITH_SIG_SM2)
if(sig_type == SM2){
(*check) = 1;
}
#endif
if((*check) == 0){
printf("Warning: you have provided optional ancillary data "\
"with a signature algorithm %s that does not need it! "\
"This data is ignored.\n", sig_name);
}
ret = 0;
err:
return ret;
}
/*
* Sign data from file and append signature
*/
ATTRIBUTE_WARN_UNUSED_RET static int sign_bin_file(const char *ec_name, const char *ec_sig_name,
const char *hash_algorithm, const char *in_fname,
const char *in_key_fname,
const char *out_fname, const char *hdr_type,
const char *version, const char *adata, u16 adata_len)
{
u8 sig[EC_MAX_SIGLEN];
u8 buf[MAX_BUF_LEN];
u8 siglen;
FILE *in_file = NULL;
ec_key_pair key_pair;
FILE *in_key_file = NULL;
FILE *out_file = NULL;
const ec_str_params *ec_str_p;
ec_params params;
int ret, check;
ec_alg_type sig_type;
hash_alg_type hash_type;
u8 priv_key_buf[EC_STRUCTURED_PRIV_KEY_MAX_EXPORT_SIZE];
u8 priv_key_buf_len;
size_t raw_data_len;
metadata_hdr hdr;
size_t read, to_read;
int eof;
u8 *allocated_buff = NULL;
struct ec_sign_context sig_ctx;
MUST_HAVE(ec_name != NULL, ret, err);
MUST_HAVE(ec_sig_name != NULL, ret, err);
MUST_HAVE(hash_algorithm != NULL, ret, err);
MUST_HAVE(in_fname != NULL, ret, err);
MUST_HAVE(in_key_fname != NULL, ret, err);
MUST_HAVE(out_fname != NULL, ret, err);
/************************************/
/* Get parameters from pretty names */
if (string_to_params
(ec_name, ec_sig_name, &sig_type, &ec_str_p, hash_algorithm,
&hash_type)) {
ret = -1;
goto err;
}
if(adata != NULL){
/* Check if ancillary data will be used */
ret = check_ancillary_data(adata, sig_type, ec_sig_name, &check); EG(ret, err);
}
/* Import the parameters */
ret = import_params(¶ms, ec_str_p); EG(ret, err);
/************************************/
/* Import the private key from the file */
in_key_file = fopen(in_key_fname, "r");
if (in_key_file == NULL) {
ret = -1;
printf("Error: file %s cannot be opened\n", in_key_fname);
goto err;
}
priv_key_buf_len = (u8)fread(priv_key_buf, 1, sizeof(priv_key_buf),
in_key_file);
ret = ec_structured_key_pair_import_from_priv_key_buf(&key_pair,
¶ms,
priv_key_buf,
priv_key_buf_len,
sig_type);
if (ret) {
ret = -1;
printf("Error: error when importing key pair from %s\n",
in_key_fname);
goto err;
}
ret = get_file_size(in_fname, &raw_data_len);
if (ret) {
ret = -1;
printf("Error: cannot retrieve file %s size\n", in_fname);
goto err;
}
if(raw_data_len == 0){
ret = -1;
printf("Error: file %s seems to be empty!\n", in_fname);
goto err;
}
ret = ec_get_sig_len(¶ms, sig_type, hash_type, &siglen);
if (ret) {
ret = -1;
printf("Error getting effective signature length from %s\n",
(const char *)(ec_str_p->name->buf));
goto err;
}
/* Structured export case, we forge a header */
if((hdr_type != NULL) && (version != NULL)){
/************************************/
/* Forge the header */
ret = generate_metadata_hdr(&hdr, hdr_type, version, raw_data_len,
EC_STRUCTURED_SIG_EXPORT_SIZE(siglen));
if (ret) {
ret = -1;
printf("Error: error when generating metadata\n");
goto err;
}
}
/* Check if we support streaming */
ret = is_sign_streaming_mode_supported(sig_type, &check); EG(ret, err);
if(check){
/**** We support streaming mode ****/
/*
* Initialize signature context and start signature computation
* with generated metadata header.
*/
ret = ec_sign_init(&sig_ctx, &key_pair, sig_type, hash_type, (const u8*)adata, adata_len);
if (ret) {
ret = -1;
printf("Error: error when signing\n");
goto err;
}
/* Structured export case, we prepend the header in the signature */
if((hdr_type != NULL) && (version != NULL)){
ret = ec_sign_update(&sig_ctx, (const u8 *)&hdr, sizeof(metadata_hdr));
if (ret) {
ret = -1;
printf("Error: error when signing\n");
goto err;
}
}
/*
* Read file content chunk by chunk up to file length, passing each
* chunk to signature update function
*/
in_file = fopen(in_fname, "r");
if (in_file == NULL) {
ret = -1;
printf("Error: file %s cannot be opened\n", in_fname);
goto err;
}
eof = 0;
clearerr(in_file);
while (raw_data_len && !eof) {
to_read =
(raw_data_len <
sizeof(buf)) ? raw_data_len : sizeof(buf);
read = fread(buf, 1, to_read, in_file);
if (read != to_read) {
/* Check if this was EOF */
ret = feof(in_file);
clearerr(in_file);
if (ret) {
eof = 1;
}
}
if (read > raw_data_len) {
/* we read more than expected: leave! */
break;
}
raw_data_len -= read;
ret = ec_sign_update(&sig_ctx, buf, (u32)read);
if (ret) {
break;
}
}
if (raw_data_len) {
ret = -1;
printf("Error: unable to read full file content\n");
goto err;
}
/* We can now complete signature generation */
ret = ec_sign_finalize(&sig_ctx, sig, siglen);
if (ret) {
ret = -1;
printf("Error: error when signing\n");
goto err;
}
}
else{
/**** We do not support streaming mode ****/
/* Since we don't support streaming mode, we unfortunately have to
* use a dynamic allocation here.
*/
size_t offset = 0;
allocated_buff = (u8*)malloc(1);
if(allocated_buff == NULL){
ret = -1;
printf("Error: allocation error\n");
goto err;
}
if((hdr_type != NULL) && (version != NULL)){
allocated_buff = (u8*)realloc(allocated_buff, sizeof(hdr));
if(allocated_buff == NULL){
ret = -1;
printf("Error: allocation error\n");
goto err;
}
memcpy(allocated_buff, &hdr, sizeof(hdr));
offset += sizeof(hdr);
}
in_file = fopen(in_fname, "r");
if (in_file == NULL) {
ret = -1;
printf("Error: file %s cannot be opened\n", in_fname);
goto err;
}
eof = 0;
clearerr(in_file);
while (raw_data_len && !eof) {
to_read =
(raw_data_len <
sizeof(buf)) ? raw_data_len : sizeof(buf);
read = fread(buf, 1, to_read, in_file);
if (read != to_read) {
/* Check if this was EOF */
ret = feof(in_file);
clearerr(in_file);
if (ret) {
eof = 1;
}
}
if (read > raw_data_len) {
/* we read more than expected: leave! */
break;
}
raw_data_len -= read;
allocated_buff = (u8*)realloc(allocated_buff, offset + read);
if(allocated_buff == NULL){
ret = -1;
printf("Error: allocation error\n");
goto err;
}
memcpy(allocated_buff + offset, buf, read);
offset += read;
}
if (raw_data_len) {
ret = -1;
printf("Error: unable to read full file content\n");
goto err;
}
/* Sign */
ret = ec_sign(sig, siglen, &key_pair, allocated_buff, (u32)offset, sig_type, hash_type, (const u8*)adata, adata_len);
if(ret){
ret = -1;
printf("Error: error when signing\n");
goto err;
}
}
/* Structured export case, forge the full structured file
* with HEADER || raw_binary || signature
*/
if((hdr_type != NULL) && (version != NULL)){
/***********************************/
/* Store the header, the raw data of the file as well as the signature */
ret = store_sig(in_fname, out_fname, sig, siglen, sig_type,
hash_type, params.curve_name, &hdr);
if (ret) {
ret = -1;
printf("Error: error when storing signature to %s\n",
out_fname);
goto err;
}
}
else{
/* Store the raw binary signature in the output file */
size_t written;
out_file = fopen(out_fname, "w");
if (out_file == NULL) {
ret = -1;
printf("Error: file %s cannot be opened\n", out_fname);
goto err;
}
written = fwrite(sig, 1, siglen, out_file);
if (written != siglen) {
ret = -1;
printf("Error: error when writing to %s\n",
out_fname);
goto err;
}
}
ret = 0;
err:
if(in_file != NULL){
if(fclose(in_file)){
ret = -1;
}
}
if(in_key_file != NULL){
if(fclose(in_key_file)){
ret = -1;
}
}
if(out_file != NULL){
if(fclose(out_file)){
ret = -1;
}
}
if(allocated_buff != NULL){
free(allocated_buff);
}
return ret;
}
/* Dump metadata header */
ATTRIBUTE_WARN_UNUSED_RET static int dump_hdr_info(const metadata_hdr * hdr)
{
int ret;
if (hdr == NULL) {
printf("Metadata header pointer is NULL!\n");
ret = -1;
goto err;
}
/* Dump the header */
printf("Metadata header info:\n");
printf(" magic = 0x%08" PRIx32 "\n", hdr->magic);
switch (hdr->type) {
case IMAGE_TYPE0:
printf(" type = IMAGE_TYPE0\n");
break;
case IMAGE_TYPE1:
printf(" type = IMAGE_TYPE1\n");
break;
case IMAGE_TYPE2:
printf(" type = IMAGE_TYPE2\n");
break;
case IMAGE_TYPE3:
printf(" type = IMAGE_TYPE3\n");
break;
default:
printf(" type %" PRIu32 " unknown!\n", hdr->type);
break;
}
printf(" version = 0x%08" PRIx32 "\n", hdr->version);
printf(" len = 0x%08" PRIx32 "\n", hdr->len);
printf(" siglen = 0x%08" PRIx32 "\n", hdr->siglen);
ret = 0;
err:
return ret;