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#include <stdio.h>
#include <stdlib.h>
#include <getopt.h>
#include <pthread.h>
#include <semaphore.h>
#include <errno.h>
#include <string.h>
#include <openssl/bn.h>
#include <openssl/rsa.h>
#include <openssl/sha.h>
#include <openssl/pem.h>
const static char base32_lookup[] = "abcdefghijklmnopqrstuvwxyz234567";
static char *search;
static int search_len;
sem_t working;
void
onion_sha(char output[16], unsigned char sum[20]) {
size_t c = 0;
int i = 0;
for (i = 0; i < 10; i+=5) {
output[c++] = base32_lookup[sum[i] >> 3];
output[c++] = base32_lookup[((sum[i] & 0x07) << 2) | (sum[i+1] >> 6)];
output[c++] = base32_lookup[(sum[i+1] >> 1) & 0x1F];
output[c++] = base32_lookup[((sum[i+1] & 1) << 4) | (sum[i+2] >> 4)];
output[c++] = base32_lookup[((sum[i+2] & 0x0F) << 1) | ((sum[i+3] & 0x80) >> 7)];
output[c++] = base32_lookup[(sum[i+3] >> 2) & 0x1F];
output[c++] = base32_lookup[((sum[i+3] & 0x03) << 3) | (sum[i+4] >> 5)];
output[c++] = base32_lookup[sum[i+4] & 0x1F];
}
}
void*
work(void *arg) {
char b32[17];
unsigned char sha[20];
unsigned long e = 3;
unsigned int e_be = 0;
unsigned char *der_data = NULL;
unsigned char *tmp_data = NULL;
size_t der_length = 0;
unsigned long volatile *kilo_hashes = arg;
unsigned long hashes = 0;
// size_t last_der_length = 0;
BIGNUM *be = NULL;
RSA *rsa_key = NULL;
SHA_CTX sha_c;
SHA_CTX working_sha_c;
rsa_key = RSA_new();
if (!rsa_key) {
fprintf(stderr, "Failed to allocate RSA key\n");
goto STOP;
}
be = BN_new();
if (!be) {
fprintf(stderr, "Failed to allocate bignum for exponent\n");
goto STOP;
}
//last_der_length = -1;
while(1) {
BN_set_word(be, e);
if (!RSA_generate_key_ex(rsa_key, 1024, be, NULL)) {
fprintf(stderr, "Failed to generate RSA key\n");
goto STOP;
}
der_length = i2d_RSAPublicKey(rsa_key, NULL);
if (der_length <= 0) {
fprintf(stderr, "i2d failed\n");
goto STOP;
}
der_data = malloc(der_length);
if (!der_data) {
fprintf(stderr, "DER data malloc failed\n");
goto STOP;
}
tmp_data = der_data;
i2d_RSAPublicKey(rsa_key, &der_data);
free(tmp_data);
/* core loop adapted from eschalot */
SHA1_Init(&sha_c);
SHA1_Update(&sha_c, der_data, der_length - 4);
while (e < 0xFFFFFFFF) {
memcpy(&working_sha_c, &sha_c, 40); /* FIXME magic */
working_sha_c.num = sha_c.num;
e_be = htobe32(e);
SHA1_Update(&working_sha_c, &e_be, sizeof(unsigned int));
SHA1_Final(&sha, &working_sha_c);
onion_sha(b32, sha);
if (hashes++ >= 1000) {
hashes = 0;
(*kilo_hashes)++;
}
b32[16] = '\0';
if(strncmp(b32, search, search_len) == 0) {
printf("Found %s.onion\n", b32);
EVP_PKEY *evp_key = EVP_PKEY_new();
if (!EVP_PKEY_assign_RSA(evp_key, rsa_key)) {
fprintf(stderr, "EVP_PKEY assignment failed\n");
goto STOP;
}
PEM_write_PrivateKey(stdout, evp_key, NULL, NULL, 0, NULL, NULL);
EVP_PKEY_free(evp_key);
goto STOP;
}
/* select next odd exponent */
e += 2;
}
printf("Wrap\n");
}
STOP:
sem_post(&working);
return NULL;
}
int
main(int argc, char **argv) {
char opt = '\0';
int thread_count = 1;
int i = 0;
pthread_t *workers = NULL;
unsigned long volatile *khash_count = NULL;
unsigned long khashes = 0;
while ((opt = getopt(argc, argv, "t:s:")) != -1) {
switch (opt) {
case 't':
thread_count = atoi(optarg);
break;
case 's':
search = optarg;
break;
}
}
if (thread_count <= 0) {
fprintf(stderr, "thread count must be > 0\n");
}
search_len = strlen(search);
workers = calloc(thread_count, sizeof(pthread_t));
if (!workers) {
perror("worker thread calloc");
return 1;
}
khash_count = calloc(thread_count, sizeof(unsigned long));
if (!khash_count) {
perror("hash count array calloc");
return 1;
}
sem_init(&working, 0, 0);
for (i = 0; i < thread_count; i++) {
if (pthread_create(&workers[i], NULL, work, &khash_count[i])) {
perror("pthread_create");
return 1;
}
}
int loops = 0;
/* workers started; wait on one to finish */
while (sem_trywait(&working) && errno == EAGAIN) {
sleep(1);
loops++;
khashes = 0;
/* approximate hashes per second */
for (i = 0; i < thread_count; i++) {
khashes += khash_count[i];
}
printf("Average rate: %.2f kH/s (%.2f KH/s/thread)\n",
(double)khashes / loops,
((double)khashes / loops) / thread_count);
}
/* FIXME signal other children to exit - use existing sema? */
// for (i = 0; i < thread_count; i++) {
// pthread_join(workers[i], NULL);
// }
return 0;
}
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