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pattern.c
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pattern.c
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/*
* Vanitygen ETH, vanity ETH address generator
* Copyright (C) 2018 <[email protected]>
*
* Vanitygen is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* any later version.
*
* Vanitygen 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 Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with Vanitygen. If not, see <http://www.gnu.org/licenses/>.
*/
#include <stdio.h>
#include <string.h>
#include <math.h>
#include <assert.h>
#include <sys/time.h>
#include <pthread.h>
#include <openssl/sha.h>
#include <openssl/ripemd.h>
#include <openssl/bn.h>
#include <openssl/ec.h>
#include <openssl/obj_mac.h>
#include "sha3.h"
#include "pattern.h"
#include "util.h"
#include "avl.h"
#include "hex.h"
extern char ticker[];
static int
vg_prefix_addr_sort(vg_context_t *vcp, void *buf);
/*
* Common code for execution helper
*/
EC_KEY *
vg_exec_context_new_key(void)
{
return EC_KEY_new_by_curve_name(NID_secp256k1);
}
/*
* Thread synchronization helpers
*/
static pthread_mutex_t vg_thread_lock = PTHREAD_MUTEX_INITIALIZER;
static pthread_cond_t vg_thread_rdcond = PTHREAD_COND_INITIALIZER;
static pthread_cond_t vg_thread_wrcond = PTHREAD_COND_INITIALIZER;
static pthread_cond_t vg_thread_upcond = PTHREAD_COND_INITIALIZER;
static void
__vg_exec_context_yield(vg_exec_context_t *vxcp)
{
vxcp->vxc_lockmode = 0;
while (vxcp->vxc_vc->vc_thread_excl) {
if (vxcp->vxc_stop) {
assert(vxcp->vxc_vc->vc_thread_excl);
vxcp->vxc_stop = 0;
pthread_cond_signal(&vg_thread_upcond);
}
pthread_cond_wait(&vg_thread_rdcond, &vg_thread_lock);
}
assert(!vxcp->vxc_stop);
assert(!vxcp->vxc_lockmode);
vxcp->vxc_lockmode = 1;
}
int
vg_exec_context_upgrade_lock(vg_exec_context_t *vxcp)
{
vg_exec_context_t *tp;
vg_context_t *vcp;
if (vxcp->vxc_lockmode == 2) return 0;
pthread_mutex_lock(&vg_thread_lock);
assert(vxcp->vxc_lockmode == 1);
vxcp->vxc_lockmode = 0;
vcp = vxcp->vxc_vc;
if (vcp->vc_thread_excl++) {
assert(vxcp->vxc_stop);
vxcp->vxc_stop = 0;
pthread_cond_signal(&vg_thread_upcond);
pthread_cond_wait(&vg_thread_wrcond, &vg_thread_lock);
for (tp = vcp->vc_threads; tp != NULL; tp = tp->vxc_next) {
assert(!tp->vxc_lockmode);
assert(!tp->vxc_stop);
}
} else {
for (tp = vcp->vc_threads; tp != NULL; tp = tp->vxc_next) {
if (tp->vxc_lockmode) {
assert(tp->vxc_lockmode != 2);
tp->vxc_stop = 1;
}
}
do {
for (tp = vcp->vc_threads;
tp != NULL;
tp = tp->vxc_next) {
if (tp->vxc_lockmode) {
assert(tp->vxc_lockmode != 2);
pthread_cond_wait(&vg_thread_upcond, &vg_thread_lock);
break;
}
}
} while (tp);
}
vxcp->vxc_lockmode = 2;
pthread_mutex_unlock(&vg_thread_lock);
return 1;
}
void
vg_exec_context_downgrade_lock(vg_exec_context_t *vxcp)
{
pthread_mutex_lock(&vg_thread_lock);
assert(vxcp->vxc_lockmode == 2);
assert(!vxcp->vxc_stop);
if (!--vxcp->vxc_vc->vc_thread_excl) {
vxcp->vxc_lockmode = 1;
pthread_cond_broadcast(&vg_thread_rdcond);
pthread_mutex_unlock(&vg_thread_lock);
return;
}
pthread_cond_signal(&vg_thread_wrcond);
__vg_exec_context_yield(vxcp);
pthread_mutex_unlock(&vg_thread_lock);
}
int
vg_exec_context_init(vg_context_t *vcp, vg_exec_context_t *vxcp)
{
pthread_mutex_lock(&vg_thread_lock);
memset(vxcp, 0, sizeof(*vxcp));
vxcp->vxc_vc = vcp;
vxcp->vxc_bntarg = BN_new();
vxcp->vxc_bntmp = BN_new();
vxcp->vxc_bntmp2 = BN_new();
vxcp->vxc_bnctx = BN_CTX_new();
assert(vxcp->vxc_bnctx);
vxcp->vxc_key = vg_exec_context_new_key();
assert(vxcp->vxc_key);
EC_KEY_precompute_mult(vxcp->vxc_key, vxcp->vxc_bnctx);
vxcp->vxc_lockmode = 0;
vxcp->vxc_stop = 0;
vxcp->vxc_next = vcp->vc_threads;
vcp->vc_threads = vxcp;
__vg_exec_context_yield(vxcp);
pthread_mutex_unlock(&vg_thread_lock);
return 1;
}
void
vg_exec_context_del(vg_exec_context_t *vxcp)
{
vg_exec_context_t *tp, **pprev;
if (vxcp->vxc_lockmode == 2) vg_exec_context_downgrade_lock(vxcp);
pthread_mutex_lock(&vg_thread_lock);
assert(vxcp->vxc_lockmode == 1);
vxcp->vxc_lockmode = 0;
for (pprev = &vxcp->vxc_vc->vc_threads, tp = *pprev;
(tp != vxcp) && (tp != NULL);
pprev = &tp->vxc_next, tp = *pprev);
assert(tp == vxcp);
*pprev = tp->vxc_next;
if (tp->vxc_stop) pthread_cond_signal(&vg_thread_upcond);
BN_clear_free(vxcp->vxc_bntarg);
BN_clear_free(vxcp->vxc_bntmp);
BN_clear_free(vxcp->vxc_bntmp2);
BN_CTX_free(vxcp->vxc_bnctx);
vxcp->vxc_bnctx = NULL;
pthread_mutex_unlock(&vg_thread_lock);
}
void
vg_exec_context_yield(vg_exec_context_t *vxcp)
{
if (vxcp->vxc_lockmode == 2) vg_exec_context_downgrade_lock(vxcp);
else if (vxcp->vxc_stop) {
assert(vxcp->vxc_lockmode == 1);
pthread_mutex_lock(&vg_thread_lock);
__vg_exec_context_yield(vxcp);
pthread_mutex_unlock(&vg_thread_lock);
}
assert(vxcp->vxc_lockmode == 1);
}
void
vg_exec_context_consolidate_key(vg_exec_context_t *vxcp)
{
if (vxcp->vxc_delta) {
BN_clear(vxcp->vxc_bntmp);
BN_set_word(vxcp->vxc_bntmp, vxcp->vxc_delta);
BN_add(vxcp->vxc_bntmp2, EC_KEY_get0_private_key(vxcp->vxc_key),
vxcp->vxc_bntmp);
vg_set_privkey(vxcp->vxc_bntmp2, vxcp->vxc_key);
vxcp->vxc_delta = 0;
}
}
void
vg_exec_context_calc_address(vg_exec_context_t *vxcp)
{
EC_POINT *pubkey;
const EC_GROUP *pgroup;
unsigned char eckey_buf[96], hash1[32];
int len;
vg_exec_context_consolidate_key(vxcp);
pgroup = EC_KEY_get0_group(vxcp->vxc_key);
pubkey = EC_POINT_new(pgroup);
EC_POINT_copy(pubkey, EC_KEY_get0_public_key(vxcp->vxc_key));
if (vxcp->vxc_vc->vc_pubkey_base) {
EC_POINT_add(pgroup, pubkey, pubkey, vxcp->vxc_vc->vc_pubkey_base, vxcp->vxc_bnctx);
}
len = EC_POINT_point2oct(pgroup, pubkey, POINT_CONVERSION_UNCOMPRESSED,
eckey_buf, sizeof(eckey_buf), vxcp->vxc_bnctx);
SHA3_256(hash1, eckey_buf+1, 64);
memcpy(vxcp->vxc_binres, hash1+12, 20);
EC_POINT_free(pubkey);
}
enum {
timing_hist_size = 5
};
typedef struct _timing_info_s {
struct _timing_info_s *ti_next;
pthread_t ti_thread;
unsigned long ti_last_rate;
unsigned long long ti_hist_time[timing_hist_size];
unsigned long ti_hist_work[timing_hist_size];
int ti_hist_last;
} timing_info_t;
static pthread_mutex_t timing_mutex = PTHREAD_MUTEX_INITIALIZER;
int
vg_output_timing(vg_context_t *vcp, int cycle, struct timeval *last)
{
pthread_t me;
struct timeval tvnow, tv;
timing_info_t *tip, *mytip;
unsigned long long rate, myrate = 0, mytime, total, sincelast;
int p, i;
/* Compute the rate */
gettimeofday(&tvnow, NULL);
timersub(&tvnow, last, &tv);
memcpy(last, &tvnow, sizeof(*last));
mytime = tv.tv_usec + (1000000ULL * tv.tv_sec);
if (!mytime) mytime = 1;
rate = 0;
pthread_mutex_lock(&timing_mutex);
me = pthread_self();
for (tip = vcp->vc_timing_head, mytip = NULL;
tip != NULL; tip = tip->ti_next) {
if (pthread_equal(tip->ti_thread, me)) {
mytip = tip;
p = ((tip->ti_hist_last + 1) % timing_hist_size);
tip->ti_hist_time[p] = mytime;
tip->ti_hist_work[p] = cycle;
tip->ti_hist_last = p;
mytime = 0;
myrate = 0;
for (i = 0; i < timing_hist_size; i++) {
mytime += tip->ti_hist_time[i];
myrate += tip->ti_hist_work[i];
}
myrate = (myrate * 1000000) / mytime;
tip->ti_last_rate = myrate;
rate += myrate;
} else rate += tip->ti_last_rate;
}
if (!mytip) {
mytip = (timing_info_t *) malloc(sizeof(*tip));
mytip->ti_next = vcp->vc_timing_head;
mytip->ti_thread = me;
vcp->vc_timing_head = mytip;
mytip->ti_hist_last = 0;
mytip->ti_hist_time[0] = mytime;
mytip->ti_hist_work[0] = cycle;
for (i = 1; i < timing_hist_size; i++) {
mytip->ti_hist_time[i] = 1;
mytip->ti_hist_work[i] = 0;
}
myrate = ((unsigned long long)cycle * 1000000) / mytime;
mytip->ti_last_rate = myrate;
rate += myrate;
}
vcp->vc_timing_total += cycle;
if (vcp->vc_timing_prevfound != vcp->vc_found) {
vcp->vc_timing_prevfound = vcp->vc_found;
vcp->vc_timing_sincelast = 0;
}
vcp->vc_timing_sincelast += cycle;
if (mytip != vcp->vc_timing_head) {
pthread_mutex_unlock(&timing_mutex);
return myrate;
}
total = vcp->vc_timing_total;
sincelast = vcp->vc_timing_sincelast;
pthread_mutex_unlock(&timing_mutex);
vcp->vc_output_timing(vcp, sincelast, rate, total);
return myrate;
}
void
vg_context_thread_exit(vg_context_t *vcp)
{
timing_info_t *tip, **ptip;
pthread_t me;
pthread_mutex_lock(&timing_mutex);
me = pthread_self();
for (ptip = &vcp->vc_timing_head, tip = *ptip;
tip != NULL;
ptip = &tip->ti_next, tip = *ptip) {
if (!pthread_equal(tip->ti_thread, me)) continue;
*ptip = tip->ti_next;
free(tip);
break;
}
pthread_mutex_unlock(&timing_mutex);
}
static void
vg_timing_info_free(vg_context_t *vcp)
{
timing_info_t *tp;
while (vcp->vc_timing_head != NULL) {
tp = vcp->vc_timing_head;
vcp->vc_timing_head = tp->ti_next;
free(tp);
}
}
void
vg_output_timing_console(vg_context_t *vcp, double count,
unsigned long long rate, unsigned long long total)
{
double prob, time, targ;
char *unit;
char linebuf[80];
int rem, p, i;
const double targs[] = { 0.5, 0.75, 0.8, 0.9, 0.95, 1.0 };
targ = rate;
unit = "key/s";
if (targ > 1000) {
unit = "Kkey/s";
targ /= 1000.0;
if (targ > 1000) {
unit = "Mkey/s";
targ /= 1000.0;
}
}
rem = sizeof(linebuf);
p = snprintf(linebuf, rem, "[%.2f %s][total %lld]", targ, unit, total);
assert(p > 0);
rem -= p;
if (rem < 0) rem = 0;
if (vcp->vc_chance >= 1.0) {
prob = 1.0f - exp(-count/vcp->vc_chance);
if (prob <= 0.999) {
p = snprintf(&linebuf[p], rem, "[Prob %.1f%%]", prob * 100);
assert(p > 0);
rem -= p;
if (rem < 0) rem = 0;
p = sizeof(linebuf) - rem;
}
for (i = 0; i < sizeof(targs)/sizeof(targs[0]); i++) {
targ = targs[i];
if ((targ < 1.0) && (prob <= targ)) break;
}
if (targ < 1.0) {
time = ((-vcp->vc_chance * log(1.0 - targ)) - count) / rate;
unit = "s";
if (time > 60) {
time /= 60;
unit = "min";
if (time > 60) {
time /= 60;
unit = "h";
if (time > 24) {
time /= 24;
unit = "d";
if (time > 365) {
time /= 365;
unit = "y";
}
}
}
}
if (time > 1000000) {
p = snprintf(&linebuf[p], rem, "[%d%% in %e%s]",
(int) (100 * targ), time, unit);
} else {
p = snprintf(&linebuf[p], rem, "[%d%% in %.1f%s]",
(int) (100 * targ), time, unit);
}
assert(p > 0);
rem -= p;
if (rem < 0) rem = 0;
p = sizeof(linebuf) - rem;
}
}
if (vcp->vc_found) {
if (vcp->vc_remove_on_match)
p = snprintf(&linebuf[p], rem, "[Found %lld/%ld]",
vcp->vc_found, vcp->vc_npatterns_start);
else
p = snprintf(&linebuf[p], rem, "[Found %lld]", vcp->vc_found);
assert(p > 0);
rem -= p;
if (rem < 0) rem = 0;
}
if (rem) {
memset(&linebuf[sizeof(linebuf)-rem], 0x20, rem);
linebuf[sizeof(linebuf)-1] = '\0';
}
printf("\r%s", linebuf);
fflush(stdout);
}
void
vg_output_match_console(vg_context_t *vcp, EC_KEY *pkey, const char *pattern)
{
unsigned char key_buf[512], *pend;
char addr_buf[64];
char privkey_buf[80];
const char *keytype = "Privkey";
int len;
EC_POINT *ppnt;
int free_ppnt = 0;
if (vcp->vc_pubkey_base) {
ppnt = EC_POINT_new(EC_KEY_get0_group(pkey));
EC_POINT_copy(ppnt, EC_KEY_get0_public_key(pkey));
EC_POINT_add(EC_KEY_get0_group(pkey), ppnt, ppnt, vcp->vc_pubkey_base, NULL);
free_ppnt = 1;
keytype = "PrivkeyPart";
} else {
ppnt = (EC_POINT *) EC_KEY_get0_public_key(pkey);
}
assert(EC_KEY_check_key(pkey));
vg_encode_address(ppnt, EC_KEY_get0_group(pkey), addr_buf);
vg_encode_privkey(pkey, privkey_buf);
int tickerlength=0;
if (vcp->vc_csv) {
if (strcmp(ticker, "")==0) {
strcpy(ticker, "ETH ");
}
tickerlength=(strlen(ticker)-1);
}
if (!vcp->vc_result_file || (vcp->vc_verbose > 0)) {
if (vcp->vc_csv) {
printf("\r%79s\r%.*s,%s,", "", tickerlength, ticker, pattern);
}
else {
printf("\r%79s\r%sPattern: %s\n", "", ticker, pattern);
}
}
if (vcp->vc_verbose > 0) {
if (vcp->vc_verbose > 1&&!(vcp->vc_csv)) {
pend = key_buf;
len = i2o_ECPublicKey(pkey, &pend);
printf("Pubkey (hex): ");
dumphex(key_buf, len);
printf("Privkey (hex): ");
dumpbn(EC_KEY_get0_private_key(pkey));
pend = key_buf;
len = i2d_ECPrivateKey(pkey, &pend);
printf("Privkey (ASN1): ");
dumphex(key_buf, len);
}
}
if (!vcp->vc_result_file || (vcp->vc_verbose > 0)) {
if (vcp->vc_csv) {
printf( "%s,", addr_buf);
printf( "%s\n", privkey_buf);
}
else {
printf("%sAddress: %s\n%s%s: %s\n",
ticker, addr_buf, ticker, keytype, privkey_buf);
}
}
if (vcp->vc_result_file) {
FILE *fp = fopen(vcp->vc_result_file, "a");
if (!fp) {
fprintf(stderr, "ERROR: could not open result file: %s\n", strerror(errno));
} else {
if (vcp->vc_csv) {
fprintf(fp, "%.*s,%s,", tickerlength,ticker, pattern);
fprintf(fp, "%s,", addr_buf);
fprintf(fp, "%s\n", privkey_buf);
fclose(fp);
}
else {
fprintf(fp, "%sPattern: %s\n", ticker, pattern);
fprintf(fp, "%sAddress: %s\n%s%s: %s\n",
ticker, addr_buf, ticker, keytype, privkey_buf);
fclose(fp);
}
}
}
if (free_ppnt) EC_POINT_free(ppnt);
}
void
vg_context_free(vg_context_t *vcp)
{
vg_timing_info_free(vcp);
vcp->vc_free(vcp);
}
int
vg_context_add_patterns(vg_context_t *vcp, const char ** const patterns, int npatterns)
{
vcp->vc_pattern_generation++;
return vcp->vc_add_patterns(vcp, patterns, npatterns);
}
void
vg_context_clear_all_patterns(vg_context_t *vcp)
{
vcp->vc_clear_all_patterns(vcp);
vcp->vc_pattern_generation++;
}
int
vg_context_addr_sort(vg_context_t *vcp, void *buf)
{
if (!vcp->vc_addr_sort) return 0;
return vcp->vc_addr_sort(vcp, buf);
}
int
vg_context_start_threads(vg_context_t *vcp)
{
vg_exec_context_t *vxcp;
int res;
for (vxcp = vcp->vc_threads; vxcp != NULL; vxcp = vxcp->vxc_next) {
res = pthread_create((pthread_t *) &vxcp->vxc_pthread, NULL,
(void *(*)(void *)) vxcp->vxc_threadfunc, vxcp);
if (res) {
fprintf(stderr, "ERROR: could not create thread: %d\n", res);
vg_context_stop_threads(vcp);
return -1;
}
vxcp->vxc_thread_active = 1;
}
return 0;
}
void
vg_context_stop_threads(vg_context_t *vcp)
{
vcp->vc_halt = 1;
vg_context_wait_for_completion(vcp);
vcp->vc_halt = 0;
}
void
vg_context_wait_for_completion(vg_context_t *vcp)
{
vg_exec_context_t *vxcp;
for (vxcp = vcp->vc_threads; vxcp != NULL; vxcp = vxcp->vxc_next) {
if (!vxcp->vxc_thread_active) continue;
pthread_join((pthread_t) vxcp->vxc_pthread, NULL);
vxcp->vxc_thread_active = 0;
}
}
/*
* Find the bignum ranges that produce a given prefix.
*/
static int
get_prefix_ranges(const uint8_t *pfx, BIGNUM **result)
{
int p;
int ret = -1;
size_t bLen;
size_t keylen;
uint8_t upbin[64], lowbin[64], binres[64];
BIGNUM *bnhigh = NULL, *bnlow = NULL, *bnhigh2 = NULL, *bnlow2 = NULL;
memset(lowbin, 0, sizeof(lowbin));
memset(upbin, 0xff, sizeof(upbin));
keylen = 20;
bnlow = BN_new();
bnhigh = BN_new();
p = strlen(pfx);
bLen = keylen;
if (!hexdec(binres, &bLen, pfx, p)) {
fprintf(stderr, "Invalid hexdec for pfx(%s) keylen: %d\n", pfx, (int)keylen);
goto out;
}
memcpy(upbin, binres, bLen);
memcpy(lowbin, binres, bLen);
BN_bin2bn(lowbin, keylen, bnlow);
BN_bin2bn(upbin, keylen, bnhigh);
/* Limit the prefix to the address type */
result[0] = bnlow;
result[1] = bnhigh;
result[2] = bnlow2;
result[3] = bnhigh2;
bnlow = NULL;
bnhigh = NULL;
bnlow2 = NULL;
bnhigh2 = NULL;
ret = 0;
out:
if (bnhigh) BN_free(bnhigh);
if (bnlow) BN_free(bnlow);
if (bnhigh2) BN_free(bnhigh2);
if (bnlow2) BN_free(bnlow2);
return ret;
}
static void
free_ranges(BIGNUM **ranges)
{
BN_free(ranges[0]);
BN_free(ranges[1]);
ranges[0] = NULL;
ranges[1] = NULL;
if (ranges[2]) {
BN_free(ranges[2]);
BN_free(ranges[3]);
ranges[2] = NULL;
ranges[3] = NULL;
}
}
/*
* Address prefix AVL tree node
*/
typedef struct _vg_prefix_s {
avl_item_t vp_item;
struct _vg_prefix_s *vp_sibling;
const char *vp_pattern;
BIGNUM *vp_low;
BIGNUM *vp_high;
} vg_prefix_t;
static void
vg_prefix_free(vg_prefix_t *vp)
{
if (vp->vp_low)
BN_free(vp->vp_low);
if (vp->vp_high)
BN_free(vp->vp_high);
free(vp);
}
static vg_prefix_t *
vg_prefix_avl_search(avl_root_t *rootp, BIGNUM *targ)
{
vg_prefix_t *vp;
avl_item_t *itemp = rootp->ar_root;
while (itemp) {
vp = avl_item_entry(itemp, vg_prefix_t, vp_item);
if (BN_cmp(vp->vp_low, targ) > 0) {
itemp = itemp->ai_left;
} else {
if (BN_cmp(vp->vp_high, targ) < 0) {
itemp = itemp->ai_right;
} else return vp;
}
}
return NULL;
}
static vg_prefix_t *
vg_prefix_avl_insert(avl_root_t *rootp, vg_prefix_t *vpnew)
{
vg_prefix_t *vp;
avl_item_t *itemp = NULL;
avl_item_t **ptrp = &rootp->ar_root;
while (*ptrp) {
itemp = *ptrp;
vp = avl_item_entry(itemp, vg_prefix_t, vp_item);
if (BN_cmp(vp->vp_low, vpnew->vp_high) > 0) {
ptrp = &itemp->ai_left;
} else {
if (BN_cmp(vp->vp_high, vpnew->vp_low) < 0) {
ptrp = &itemp->ai_right;
} else return vp;
}
}
vpnew->vp_item.ai_up = itemp;
itemp = &vpnew->vp_item;
*ptrp = itemp;
avl_insert_fix(rootp, itemp);
return NULL;
}
static vg_prefix_t *
vg_prefix_first(avl_root_t *rootp)
{
avl_item_t *itemp;
itemp = avl_first(rootp);
if (itemp) return avl_item_entry(itemp, vg_prefix_t, vp_item);
return NULL;
}
static vg_prefix_t *
vg_prefix_next(vg_prefix_t *vp)
{
avl_item_t *itemp = &vp->vp_item;
itemp = avl_next(itemp);
if (itemp)
return avl_item_entry(itemp, vg_prefix_t, vp_item);
return NULL;
}
static vg_prefix_t *
vg_prefix_add(avl_root_t *rootp, const char *pattern, BIGNUM *low, BIGNUM *high)
{
vg_prefix_t *vp, *vp2;
/* assert(BN_cmp(low, high) < 0); */
assert(BN_cmp(low, high) < 1);
vp = (vg_prefix_t *) malloc(sizeof(*vp));
if (vp) {
avl_item_init(&vp->vp_item);
vp->vp_sibling = NULL;
vp->vp_pattern = pattern;
vp->vp_low = low;
vp->vp_high = high;
vp2 = vg_prefix_avl_insert(rootp, vp);
if (vp2 != NULL) {
fprintf(stderr, "Prefix '%s' ignored, overlaps '%s'\n",
pattern, vp2->vp_pattern);
vg_prefix_free(vp);
vp = NULL;
}
}
return vp;
}
static void
vg_prefix_delete(avl_root_t *rootp, vg_prefix_t *vp)
{
vg_prefix_t *sibp, *delp;
avl_remove(rootp, &vp->vp_item);
sibp = vp->vp_sibling;
while (sibp && sibp != vp) {
avl_remove(rootp, &sibp->vp_item);
delp = sibp;
sibp = sibp->vp_sibling;
vg_prefix_free(delp);
}
vg_prefix_free(vp);
}
static vg_prefix_t *
vg_prefix_add_ranges(avl_root_t *rootp, const char *pattern, BIGNUM **ranges,
vg_prefix_t *master)
{
vg_prefix_t *vp, *vp2 = NULL;
assert(ranges[0]);
vp = vg_prefix_add(rootp, pattern, ranges[0], ranges[1]);
if (!vp) return NULL;
if (ranges[2]) {
vp2 = vg_prefix_add(rootp, pattern, ranges[2], ranges[3]);
if (!vp2) {
vg_prefix_delete(rootp, vp);
return NULL;
}
}
if (!master) {
vp->vp_sibling = vp2;
if (vp2) vp2->vp_sibling = vp;
} else if (vp2) {
vp->vp_sibling = vp2;
vp2->vp_sibling = (master->vp_sibling ? master->vp_sibling : master);
master->vp_sibling = vp;
} else {
vp->vp_sibling = (master->vp_sibling ? master->vp_sibling : master);
master->vp_sibling = vp;
}
return vp;
}
static void
vg_prefix_range_sum(vg_prefix_t *vp, BIGNUM *result, BIGNUM *tmp1)
{
vg_prefix_t *startp;
startp = vp;
BN_clear(result);
do {
BN_sub(tmp1, vp->vp_high, vp->vp_low);
BN_add(result, result, tmp1);
vp = vp->vp_sibling;
} while (vp && (vp != startp));
}
typedef struct _vg_prefix_context_s {
vg_context_t base;
avl_root_t vcp_avlroot;
BIGNUM *vcp_difficulty;
int vcp_caseinsensitive;
} vg_prefix_context_t;
static void
vg_prefix_context_clear_all_patterns(vg_context_t *vcp)
{
vg_prefix_context_t *vcpp = (vg_prefix_context_t *) vcp;
vg_prefix_t *vp;
unsigned long npfx_left = 0;
while (!avl_root_empty(&vcpp->vcp_avlroot)) {
vp = avl_item_entry(vcpp->vcp_avlroot.ar_root, vg_prefix_t, vp_item);
vg_prefix_delete(&vcpp->vcp_avlroot, vp);
npfx_left++;
}
assert(npfx_left == vcpp->base.vc_npatterns);
vcpp->base.vc_npatterns = 0;
vcpp->base.vc_npatterns_start = 0;
vcpp->base.vc_found = 0;
BN_clear(vcpp->vcp_difficulty);
}
static void
vg_prefix_context_free(vg_context_t *vcp)
{
vg_prefix_context_t *vcpp = (vg_prefix_context_t *) vcp;
vg_prefix_context_clear_all_patterns(vcp);
BN_clear_free(vcpp->vcp_difficulty);
free(vcpp);
}
static void
vg_prefix_context_next_difficulty(vg_prefix_context_t *vcpp,
BIGNUM *bntmp, BIGNUM *bntmp2, BN_CTX *bnctx)
{
char *dbuf;
BN_clear(bntmp);
BN_set_bit(bntmp, 160);
BN_div(bntmp2, NULL, bntmp, vcpp->vcp_difficulty, bnctx);
dbuf = BN_bn2dec(bntmp2);
if (vcpp->base.vc_verbose > 0) {
if (vcpp->base.vc_npatterns > 1)
fprintf(stderr, "Next match difficulty: %s (%ld prefixes)\n",
dbuf, vcpp->base.vc_npatterns);
else
fprintf(stderr, "Difficulty: %s\n", dbuf);
}
vcpp->base.vc_chance = atof(dbuf);
OPENSSL_free(dbuf);
}
static int
vg_prefix_context_add_patterns(vg_context_t *vcp,
const char ** const patterns, int npatterns)
{
vg_prefix_context_t *vcpp = (vg_prefix_context_t *) vcp;
vg_prefix_t *vp;
BN_CTX *bnctx;
BIGNUM *bntmp, *bntmp2, *bntmp3;
BIGNUM *ranges[4];
int ret = 0;
int i, impossible = 0;
unsigned long npfx;
char *dbuf;
bnctx = BN_CTX_new();
bntmp = BN_new();
bntmp2 = BN_new();
bntmp3 = BN_new();
npfx = 0;
for (i = 0; i < npatterns; i++) {
vp = NULL;
ret = get_prefix_ranges(patterns[i], ranges);
if (!ret) {
vp = vg_prefix_add_ranges(&vcpp->vcp_avlroot, patterns[i],
ranges, NULL);
}
if (ret == -2) {
fprintf(stderr, "Prefix '%s' not possible\n", patterns[i]);
impossible++;
}
if (!vp)
continue;
npfx++;
/* Determine the probability of finding a match */
vg_prefix_range_sum(vp, bntmp, bntmp2);
BN_add(bntmp2, vcpp->vcp_difficulty, bntmp);
BN_copy(vcpp->vcp_difficulty, bntmp2);
if (vcp->vc_verbose > 1) {
BN_clear(bntmp2);
BN_set_bit(bntmp2, 160);
BN_div(bntmp3, NULL, bntmp2, bntmp, bnctx);
dbuf = BN_bn2dec(bntmp3);
fprintf(stderr, "Prefix difficulty: %20s %s\n", dbuf, patterns[i]);
OPENSSL_free(dbuf);
}
}
vcpp->base.vc_npatterns += npfx;
vcpp->base.vc_npatterns_start += npfx;
if (!npfx && impossible) {
fprintf(stderr, "Hint: [5678]* for valid prefixes.\n");
}
if (npfx) vg_prefix_context_next_difficulty(vcpp, bntmp, bntmp2, bnctx);
ret = (npfx != 0);
BN_clear_free(bntmp);
BN_clear_free(bntmp2);
BN_clear_free(bntmp3);
BN_CTX_free(bnctx);
return ret;