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/*
* ecgen, tool for generating Elliptic curve domain parameters
* Copyright (C) 2017 J08nY
*/
#include "seed.h"
#include <sha1/sha1.h>
#include "io/output.h"
#include "util/binascii.h"
#include "util/memory.h"
seed_t *seed_new(void) { return try_calloc(sizeof(seed_t)); }
seed_t *seed_copy(const seed_t *src, seed_t *dest) {
if (src->seed) dest->seed = gcopy(src->seed);
return dest;
}
seed_t *seed_new_copy(const seed_t *src) {
seed_t *result = seed_new();
return seed_copy(src, result);
}
seed_t *seed_clone(const seed_t *src, seed_t *dest) {
if (src->seed) dest->seed = gclone(src->seed);
return dest;
}
seed_t *seed_new_clone(const seed_t *src) {
seed_t *result = seed_new();
return seed_clone(src, result);
}
void seed_free(seed_t **seed) {
if (*seed) {
if ((*seed)->seed && isclone((*seed)->seed)) {
gunclone((*seed)->seed);
}
if ((*seed)->hex) {
try_free((*seed)->hex);
}
if ((*seed)->raw) {
try_free((*seed)->raw);
}
if ((*seed)->hash20) {
try_free((*seed)->hash20);
}
try_free(*seed);
*seed = NULL;
}
}
static GEN seed_stoi(const char *cstr) {
pari_sp ltop = avma;
size_t len = strlen(cstr);
char *seed_str;
if (len <= 3 || !(cstr[0] == '0' && (cstr[1] == 'x' || cstr[1] == 'X'))) {
seed_str = try_malloc((size_t)(len + 3));
strncpy(seed_str + 2, cstr, len);
seed_str[0] = '0';
seed_str[1] = 'x';
} else {
seed_str = try_malloc(len + 1);
strncpy(seed_str, cstr, len);
}
GEN i = strtoi(seed_str);
try_free(seed_str);
return gerepilecopy(ltop, i);
}
static char *seed_itos(GEN seed) {
pari_sp ltop = avma;
char *result = pari_sprintf("%Px", seed);
char *seed_str = try_malloc(strlen(result) + 1);
strcpy(seed_str, result);
avma = ltop;
return seed_str;
}
static char *seed_strip(const char *cstr) {
char *seed_str = try_malloc(strlen(cstr) + 1);
char *prefix = strstr(cstr, "0x");
if (prefix != NULL) {
strcpy(seed_str, cstr + 2);
} else {
strcpy(seed_str, cstr);
}
return seed_str;
}
static void hash_string(const char *str, int len, unsigned char *hashout) {
SHA_CTX ctx = {};
SHA1_Init(&ctx);
SHA1_Update(&ctx, str, len);
SHA1_Final(hashout, &ctx);
}
GENERATOR(seed_gen_random) {
seed_t *seed = seed_new();
seed->seed = random_int(160);
seed->hex = seed_itos(seed->seed);
seed->hex_len = strlen(seed->hex);
seed->raw = binascii_itob(seed->seed, ENDIAN_BIG);
seed->raw_len = binascii_blen(seed->seed);
seed->hash20 = try_malloc(20);
hash_string(seed->raw, (int)seed->raw_len, seed->hash20);
curve->seed = seed;
return 1;
}
GENERATOR(seed_gen_argument) {
seed_t *seed = seed_new();
seed->seed = seed_stoi(cfg->seed);
seed->hex = seed_strip(cfg->seed);
seed->hex_len = strlen(seed->hex);
seed->raw = binascii_itob(seed->seed, ENDIAN_BIG);
seed->raw_len = binascii_blen(seed->seed);
seed->hash20 = try_malloc(20);
hash_string(seed->raw, (int)seed->raw_len, seed->hash20);
curve->seed = seed;
return 1;
}
GENERATOR(seed_gen_input) {
pari_sp ltop = avma;
GEN str = input_string("seed:");
const char *cstr = GSTR(str);
if (strlen(cstr) < 40) {
fprintf(err, "SEED must be at least 160 bits(40 hex characters).\n");
avma = ltop;
return 0;
}
seed_t *seed = seed_new();
seed->seed = seed_stoi(cstr);
seed->hex = seed_strip(cstr);
seed->hex_len = strlen(seed->hex);
seed->raw = binascii_itob(seed->seed, ENDIAN_BIG);
seed->raw_len = binascii_blen(seed->seed);
seed->hash20 = try_malloc(20);
hash_string(seed->raw, (int)seed->raw_len, seed->hash20);
curve->seed = seed;
return 1;
}
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