/*
* This inits the values g and p which are used for DH key agreement
* FIXME: Make the function thread safe by adding a semaphore or mutex.
*/
int ssh_crypto_init(void) {
if (ssh_crypto_initialized == 0) {
#ifdef HAVE_LIBGCRYPT
gcry_check_version(NULL);
if (!gcry_control(GCRYCTL_INITIALIZATION_FINISHED_P,0)) {
gcry_control(GCRYCTL_INIT_SECMEM, 4096);
gcry_control(GCRYCTL_INITIALIZATION_FINISHED,0);
}
#endif
g = bignum_new();
if (g == NULL) {
return -1;
}
bignum_set_word(g,g_int);
#ifdef HAVE_LIBGCRYPT
bignum_bin2bn(p_group1_value, P_GROUP1_LEN, &p_group1);
if (p_group1 == NULL) {
bignum_free(g);
g = NULL;
return -1;
}
bignum_bin2bn(p_group14_value, P_GROUP14_LEN, &p_group14);
if (p_group14 == NULL) {
bignum_free(g);
bignum_free(p_group1);
g = NULL;
p_group1 = NULL;
return -1;
}
#elif defined HAVE_LIBCRYPTO
p_group1 = bignum_new();
if (p_group1 == NULL) {
bignum_free(g);
g = NULL;
return -1;
}
bignum_bin2bn(p_group1_value, P_GROUP1_LEN, p_group1);
p_group14 = bignum_new();
if (p_group14 == NULL) {
bignum_free(g);
bignum_free(p_group1);
g = NULL;
p_group1 = NULL;
return -1;
}
bignum_bin2bn(p_group14_value, P_GROUP14_LEN, p_group14);
OpenSSL_add_all_algorithms();
#endif
ssh_crypto_initialized = 1;
}
return 0;
}
char *ssh_gcry_bn2dec(bignum bn) {
bignum bndup, num, ten;
char *ret;
int count, count2;
int size, rsize;
char decnum;
size = gcry_mpi_get_nbits(bn) * 3;
rsize = size / 10 + size / 1000 + 2;
ret = malloc(rsize + 1);
if (ret == NULL) {
return NULL;
}
if (!gcry_mpi_cmp_ui(bn, 0)) {
strcpy(ret, "0");
} else {
ten = bignum_new();
if (ten == NULL) {
SAFE_FREE(ret);
return NULL;
}
num = bignum_new();
if (num == NULL) {
SAFE_FREE(ret);
bignum_safe_free(ten);
return NULL;
}
for (bndup = gcry_mpi_copy(bn), bignum_set_word(ten, 10), count = rsize;
count; count--) {
gcry_mpi_div(bndup, num, bndup, ten, 0);
for (decnum = 0, count2 = gcry_mpi_get_nbits(num); count2;
decnum *= 2, decnum += (gcry_mpi_test_bit(num, count2 - 1) ? 1 : 0),
count2--)
;
ret[count - 1] = decnum + '0';
}
for (count = 0; count < rsize && ret[count] == '0'; count++)
;
for (count2 = 0; count2 < rsize - count; ++count2) {
ret[count2] = ret[count2 + count];
}
ret[count2] = 0;
bignum_safe_free(num);
bignum_safe_free(bndup);
bignum_safe_free(ten);
}
return ret;
}
