/* ID should be:
* 3 for MAC
* 2 for IV
* 1 for encryption key
*
* Note that this function produces different key for the
* NULL password, and for the password with zero length.
*/
int
_gnutls_pkcs12_string_to_key(const mac_entry_st * me,
unsigned int id, const uint8_t * salt,
unsigned int salt_size, unsigned int iter,
const char *pw, unsigned int req_keylen,
uint8_t * keybuf)
{
int rc;
unsigned int i, j;
digest_hd_st md;
bigint_t num_b1 = NULL, num_ij = NULL;
bigint_t mpi512 = NULL;
unsigned int pwlen;
uint8_t hash[MAX_HASH_SIZE], buf_b[64], buf_i[MAX_PASS_LEN * 2 + 64], *p;
uint8_t d[64];
size_t cur_keylen;
size_t n, m, p_size, i_size;
unsigned mac_len;
const uint8_t buf_512[] = /* 2^64 */
{ 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00
};
cur_keylen = 0;
if (pw == NULL)
pwlen = 0;
else
pwlen = strlen(pw);
if (pwlen > MAX_PASS_LEN) {
gnutls_assert();
return GNUTLS_E_INVALID_REQUEST;
}
if ((rc = _pkcs12_check_pass(pw, pwlen)) < 0) {
gnutls_assert();
return rc;
}
rc = _gnutls_mpi_init_scan(&mpi512, buf_512, sizeof(buf_512));
if (rc < 0) {
gnutls_assert();
return rc;
}
/* Store salt and password in BUF_I */
p_size = ((pwlen / 64) * 64) + 64;
if (p_size > sizeof(buf_i) - 64)
return gnutls_assert_val(GNUTLS_E_INVALID_REQUEST);
p = buf_i;
for (i = 0; i < 64; i++)
*p++ = salt[i % salt_size];
if (pw) {
for (i = j = 0; i < p_size; i += 2) {
*p++ = 0;
*p++ = pw[j];
if (++j > pwlen) /* Note, that we include the trailing (0) */
j = 0;
}
} else
memset(p, 0, p_size);
i_size = 64 + p_size;
mac_len = _gnutls_mac_get_algo_len(me);
for (;;) {
rc = _gnutls_hash_init(&md, me);
if (rc < 0) {
gnutls_assert();
goto cleanup;
}
memset(d, id & 0xff, 64);
_gnutls_hash(&md, d, 64);
_gnutls_hash(&md, buf_i, pw ? i_size : 64);
_gnutls_hash_deinit(&md, hash);
for (i = 1; i < iter; i++) {
rc = _gnutls_hash_fast(me->id, hash, mac_len,
hash);
if (rc < 0) {
gnutls_assert();
goto cleanup;
}
}
for (i = 0; i < mac_len && cur_keylen < req_keylen; i++)
keybuf[cur_keylen++] = hash[i];
if (cur_keylen == req_keylen) {
rc = 0; /* ready */
goto cleanup;
}
/* need more bytes. */
for (i = 0; i < 64; i++)
buf_b[i] = hash[i % mac_len];
n = 64;
rc = _gnutls_mpi_init_scan(&num_b1, buf_b, n);
if (rc < 0) {
gnutls_assert();
goto cleanup;
}
rc = _gnutls_mpi_add_ui(num_b1, num_b1, 1);
if (rc < 0) {
gnutls_assert();
goto cleanup;
}
for (i = 0; i < 128; i += 64) {
n = 64;
rc = _gnutls_mpi_init_scan(&num_ij, buf_i + i, n);
if (rc < 0) {
gnutls_assert();
goto cleanup;
}
rc = _gnutls_mpi_addm(num_ij, num_ij, num_b1, mpi512);
if (rc < 0) {
gnutls_assert();
goto cleanup;
}
n = 64;
#ifndef PKCS12_BROKEN_KEYGEN
m = (_gnutls_mpi_get_nbits(num_ij) + 7) / 8;
#else
m = n;
#endif
memset(buf_i + i, 0, n - m);
rc = _gnutls_mpi_print(num_ij, buf_i + i + n - m,
&n);
if (rc < 0) {
gnutls_assert();
goto cleanup;
}
_gnutls_mpi_release(&num_ij);
}
}
cleanup:
_gnutls_mpi_release(&num_ij);
_gnutls_mpi_release(&num_b1);
_gnutls_mpi_release(&mpi512);
return rc;
}
/* ID should be:
* 3 for MAC
* 2 for IV
* 1 for encryption key
*/
int
_gnutls_pkcs12_string_to_key (unsigned int id, const opaque * salt,
unsigned int salt_size, unsigned int iter,
const char *pw, unsigned int req_keylen,
opaque * keybuf)
{
int rc;
unsigned int i, j;
digest_hd_st md;
bigint_t num_b1 = NULL, num_ij = NULL;
bigint_t mpi512 = NULL;
unsigned int pwlen;
opaque hash[20], buf_b[64], buf_i[128], *p;
size_t cur_keylen;
size_t n;
const opaque buf_512[] = /* 2^64 */
{ 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
};
cur_keylen = 0;
if (pw == NULL)
pwlen = 0;
else
pwlen = strlen (pw);
if (pwlen > 63 / 2)
{
gnutls_assert ();
return GNUTLS_E_INVALID_REQUEST;
}
if ((rc = _pkcs12_check_pass (pw, pwlen)) < 0)
{
gnutls_assert ();
return rc;
}
rc = _gnutls_mpi_scan (&mpi512, buf_512, sizeof (buf_512));
if (rc < 0)
{
gnutls_assert ();
return rc;
}
/* Store salt and password in BUF_I */
p = buf_i;
for (i = 0; i < 64; i++)
*p++ = salt[i % salt_size];
if (pw)
{
for (i = j = 0; i < 64; i += 2)
{
*p++ = 0;
*p++ = pw[j];
if (++j > pwlen) /* Note, that we include the trailing zero */
j = 0;
}
}
else
memset (p, 0, 64);
for (;;)
{
rc = _gnutls_hash_init (&md, GNUTLS_MAC_SHA1);
if (rc < 0)
{
gnutls_assert ();
goto cleanup;
}
for (i = 0; i < 64; i++)
{
unsigned char lid = id & 0xFF;
_gnutls_hash (&md, &lid, 1);
}
_gnutls_hash (&md, buf_i, pw ? 128 : 64);
_gnutls_hash_deinit (&md, hash);
for (i = 1; i < iter; i++)
{
rc = _gnutls_hash_init (&md, GNUTLS_MAC_SHA1);
if (rc < 0)
{
gnutls_assert ();
goto cleanup;
}
_gnutls_hash (&md, hash, 20);
_gnutls_hash_deinit (&md, hash);
}
for (i = 0; i < 20 && cur_keylen < req_keylen; i++)
keybuf[cur_keylen++] = hash[i];
if (cur_keylen == req_keylen)
{
rc = 0; /* ready */
goto cleanup;
}
/* need more bytes. */
for (i = 0; i < 64; i++)
buf_b[i] = hash[i % 20];
n = 64;
rc = _gnutls_mpi_scan (&num_b1, buf_b, n);
if (rc < 0)
{
gnutls_assert ();
goto cleanup;
}
_gnutls_mpi_add_ui (num_b1, num_b1, 1);
for (i = 0; i < 128; i += 64)
{
n = 64;
rc = _gnutls_mpi_scan (&num_ij, buf_i + i, n);
if (rc < 0)
{
gnutls_assert ();
goto cleanup;
}
_gnutls_mpi_addm (num_ij, num_ij, num_b1, mpi512);
n = 64;
rc = _gnutls_mpi_print (num_ij, buf_i + i, &n);
if (rc < 0)
{
gnutls_assert ();
goto cleanup;
}
_gnutls_mpi_release (&num_ij);
}
}
cleanup:
_gnutls_mpi_release (&num_ij);
_gnutls_mpi_release (&num_b1);
_gnutls_mpi_release (&mpi512);
return rc;
}
