/*
* Copyright (C) 2001-2012 Free Software Foundation, Inc.
*
* Author: Nikos Mavrogiannopoulos
*
* This file is part of GnuTLS.
*
* The GnuTLS is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public License
* as published by the Free Software Foundation; either version 2.1 of
* the License, or (at your option) any later version.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this program. If not, see <https://www.gnu.org/licenses/>
*
*/
#include "gnutls_int.h"
#ifdef ENABLE_SRP
#include "errors.h"
#include <auth/srp_passwd.h>
#include "auth.h"
#include "srp.h"
#include "num.h"
#include <auth/srp_kx.h>
#include <str.h>
#include <datum.h>
#include <ext/srp.h>
const mod_auth_st srp_auth_struct = {
"SRP",
NULL,
NULL,
_gnutls_gen_srp_server_kx,
_gnutls_gen_srp_client_kx,
NULL,
NULL,
NULL,
NULL, /* certificate */
_gnutls_proc_srp_server_kx,
_gnutls_proc_srp_client_kx,
NULL,
NULL
};
#define _b session->key.proto.tls12.srp.b
#define B session->key.proto.tls12.srp.B
#define _a session->key.proto.tls12.srp.a
#define A session->key.proto.tls12.srp.A
#define N session->key.proto.tls12.srp.srp_p
#define G session->key.proto.tls12.srp.srp_g
#define V session->key.proto.tls12.srp.x
#define S session->key.proto.tls12.srp.srp_key
/* Checks if a%n==0,+1,-1%n which is a fatal srp error.
* Returns a proper error code in that case, and 0 when
* all are ok.
*/
inline static int check_param_mod_n(bigint_t a, bigint_t n, int is_a)
{
int ret, err = 0;
bigint_t r;
ret = _gnutls_mpi_init(&r);
if (ret < 0)
return gnutls_assert_val(ret);
ret = _gnutls_mpi_modm(r, a, n);
if (ret < 0) {
_gnutls_mpi_release(&r);
return gnutls_assert_val(ret);
}
ret = _gnutls_mpi_cmp_ui(r, 0);
if (ret == 0)
err = 1;
if (is_a != 0) {
ret = _gnutls_mpi_cmp_ui(r, 1);
if (ret == 0)
err = 1;
ret = _gnutls_mpi_add_ui(r, r, 1);
if (ret < 0) {
_gnutls_mpi_release(&r);
return gnutls_assert_val(ret);
}
ret = _gnutls_mpi_cmp(r, n);
if (ret == 0)
err = 1;
}
_gnutls_mpi_release(&r);
if (err != 0) {
gnutls_assert();
return GNUTLS_E_RECEIVED_ILLEGAL_PARAMETER;
}
return 0;
}
/* Send the first key exchange message ( g, n, s) and append the verifier algorithm number
* Data is allocated by the caller, and should have data_size size.
*/
int
_gnutls_gen_srp_server_kx(gnutls_session_t session,
gnutls_buffer_st * data)
{
int ret;
char *username;
SRP_PWD_ENTRY *pwd_entry;
srp_server_auth_info_t info;
size_t tmp_size;
gnutls_ext_priv_data_t epriv;
srp_ext_st *priv;
unsigned init_pos;
ret =
_gnutls_hello_ext_get_priv(session, GNUTLS_EXTENSION_SRP,
&epriv);
if (ret < 0) { /* peer didn't send a username */
gnutls_assert();
return GNUTLS_E_UNKNOWN_SRP_USERNAME;
}
priv = epriv;
if ((ret =
_gnutls_auth_info_init(session, GNUTLS_CRD_SRP,
sizeof(srp_server_auth_info_st),
1)) < 0) {
gnutls_assert();
return ret;
}
info = _gnutls_get_auth_info(session, GNUTLS_CRD_SRP);
if (info == NULL)
return gnutls_assert_val(GNUTLS_E_INTERNAL_ERROR);
username = info->username;
_gnutls_str_cpy(username, MAX_USERNAME_SIZE, priv->username);
ret = _gnutls_srp_pwd_read_entry(session, username, &pwd_entry);
if (ret < 0) {
gnutls_assert();
return ret;
}
init_pos = data->length;
/* copy from pwd_entry to local variables (actually in session) */
tmp_size = pwd_entry->g.size;
if (_gnutls_mpi_init_scan_nz(&G, pwd_entry->g.data, tmp_size) < 0) {
gnutls_assert();
ret = GNUTLS_E_RECEIVED_ILLEGAL_PARAMETER;
goto cleanup;
}
tmp_size = pwd_entry->n.size;
if (_gnutls_mpi_init_scan_nz(&N, pwd_entry->n.data, tmp_size) < 0) {
gnutls_assert();
ret = GNUTLS_E_RECEIVED_ILLEGAL_PARAMETER;
goto cleanup;
}
tmp_size = pwd_entry->v.size;
if (_gnutls_mpi_init_scan_nz(&V, pwd_entry->v.data, tmp_size) < 0) {
gnutls_assert();
ret = GNUTLS_E_RECEIVED_ILLEGAL_PARAMETER;
goto cleanup;
}
/* Calculate: B = (k*v + g^b) % N
*/
B = _gnutls_calc_srp_B(&_b, G, N, V);
if (B == NULL) {
gnutls_assert();
ret = GNUTLS_E_MEMORY_ERROR;
goto cleanup;
}
/* copy N (mod n)
*/
ret =
_gnutls_buffer_append_data_prefix(data, 16, pwd_entry->n.data,
pwd_entry->n.size);
if (ret < 0) {
gnutls_assert();
goto cleanup;
}
/* copy G (generator) to data
*/
ret =
_gnutls_buffer_append_data_prefix(data, 16, pwd_entry->g.data,
pwd_entry->g.size);
if (ret < 0) {
gnutls_assert();
goto cleanup;
}
/* copy the salt
*/
ret =
_gnutls_buffer_append_data_prefix(data, 8,
pwd_entry->salt.data,
pwd_entry->salt.size);
if (ret < 0) {
gnutls_assert();
goto cleanup;
}
/* Copy the B value
*/
ret = _gnutls_buffer_append_mpi(data, 16, B, 0);
if (ret < 0) {
gnutls_assert();
goto cleanup;
}
_gnutls_mpi_log("SRP B: ", B);
ret = data->length - init_pos;
cleanup:
_gnutls_srp_entry_free(pwd_entry);
return ret;
}
/* return A = g^a % N */
int
_gnutls_gen_srp_client_kx(gnutls_session_t session,
gnutls_buffer_st * data)
{
int ret;
char *username, *password;
gnutls_srp_client_credentials_t cred;
gnutls_ext_priv_data_t epriv;
srp_ext_st *priv;
ret =
_gnutls_hello_ext_get_priv(session, GNUTLS_EXTENSION_SRP,
&epriv);
if (ret < 0) { /* peer didn't send a username */
gnutls_assert();
return GNUTLS_E_UNKNOWN_SRP_USERNAME;
}
priv = epriv;
cred = (gnutls_srp_client_credentials_t)
_gnutls_get_cred(session, GNUTLS_CRD_SRP);
if (cred == NULL) {
gnutls_assert();
return GNUTLS_E_INSUFFICIENT_CREDENTIALS;
}
if (priv->username == NULL) {
username = cred->username;
password = cred->password;
} else {
username = priv->username;
password = priv->password;
}
if (username == NULL || password == NULL) {
gnutls_assert();
return GNUTLS_E_INSUFFICIENT_CREDENTIALS;
}
/* calc A = g^a % N
*/
if (G == NULL || N == NULL) {
gnutls_assert();
return GNUTLS_E_INSUFFICIENT_CREDENTIALS;
}
A = _gnutls_calc_srp_A(&_a, G, N);
if (A == NULL) {
gnutls_assert();
return GNUTLS_E_MEMORY_ERROR;
}
/* Rest of SRP calculations
*/
/* calculate u */
session->key.proto.tls12.srp.u = _gnutls_calc_srp_u(A, B, N);
if (session->key.proto.tls12.srp.u == NULL) {
gnutls_assert();
return GNUTLS_E_MEMORY_ERROR;
}
_gnutls_mpi_log("SRP U: ", session->key.proto.tls12.srp.u);
/* S = (B - g^x) ^ (a + u * x) % N */
S = _gnutls_calc_srp_S2(B, G, session->key.proto.tls12.srp.x, _a, session->key.proto.tls12.srp.u,
N);
if (S == NULL) {
gnutls_assert();
return GNUTLS_E_MEMORY_ERROR;
}
_gnutls_mpi_log("SRP B: ", B);
zrelease_temp_mpi_key(&_b);
zrelease_temp_mpi_key(&V);
zrelease_temp_mpi_key(&session->key.proto.tls12.srp.u);
zrelease_temp_mpi_key(&B);
ret = _gnutls_mpi_dprint(session->key.proto.tls12.srp.srp_key, &session->key.key);
zrelease_temp_mpi_key(&S);
if (ret < 0) {
gnutls_assert();
return ret;
}
ret = _gnutls_buffer_append_mpi(data, 16, A, 0);
if (ret < 0)
return gnutls_assert_val(ret);
_gnutls_mpi_log("SRP A: ", A);
_gnutls_mpi_release(&A);
return data->length;
}
/* just read A and put it to session */
int
_gnutls_proc_srp_client_kx(gnutls_session_t session, uint8_t * data,
size_t _data_size)
{
ssize_t _n_A;
ssize_t data_size = _data_size;
int ret;
DECR_LEN(data_size, 2);
_n_A = _gnutls_read_uint16(&data[0]);
DECR_LEN(data_size, _n_A);
if (_gnutls_mpi_init_scan_nz(&A, &data[2], _n_A) || A == NULL) {
gnutls_assert();
return GNUTLS_E_RECEIVED_ILLEGAL_PARAMETER;
}
_gnutls_mpi_log("SRP A: ", A);
_gnutls_mpi_log("SRP B: ", B);
/* Checks if A % n == 0.
*/
if ((ret = check_param_mod_n(A, N, 1)) < 0) {
gnutls_assert();
return ret;
}
/* Start the SRP calculations.
* - Calculate u
*/
session->key.proto.tls12.srp.u = _gnutls_calc_srp_u(A, B, N);
if (session->key.proto.tls12.srp.u == NULL) {
gnutls_assert();
return GNUTLS_E_MEMORY_ERROR;
}
_gnutls_mpi_log("SRP U: ", session->key.proto.tls12.srp.u);
/* S = (A * v^u) ^ b % N
*/
S = _gnutls_calc_srp_S1(A, _b, session->key.proto.tls12.srp.u, V, N);
if (S == NULL) {
gnutls_assert();
return GNUTLS_E_MEMORY_ERROR;
}
_gnutls_mpi_log("SRP S: ", S);
_gnutls_mpi_release(&A);
zrelease_temp_mpi_key(&_b);
zrelease_temp_mpi_key(&V);
zrelease_temp_mpi_key(&session->key.proto.tls12.srp.u);
zrelease_temp_mpi_key(&B);
ret = _gnutls_mpi_dprint(session->key.proto.tls12.srp.srp_key, &session->key.key);
zrelease_temp_mpi_key(&S);
if (ret < 0) {
gnutls_assert();
return ret;
}
return 0;
}
/* Static parameters according to draft-ietf-tls-srp-07
* Note that if more parameters are added check_g_n()
* and _gnutls_srp_entry_free() should be changed.
*/
static const unsigned char srp_params_1024[] = {
0xEE, 0xAF, 0x0A, 0xB9, 0xAD, 0xB3, 0x8D, 0xD6,
0x9C, 0x33, 0xF8, 0x0A, 0xFA, 0x8F, 0xC5, 0xE8,
0x60, 0x72, 0x61, 0x87, 0x75, 0xFF, 0x3C, 0x0B,
0x9E, 0xA2, 0x31, 0x4C, 0x9C, 0x25, 0x65, 0x76,
0xD6, 0x74, 0xDF, 0x74, 0x96, 0xEA, 0x81, 0xD3,
0x38, 0x3B, 0x48, 0x13, 0xD6, 0x92, 0xC6, 0xE0,
0xE0, 0xD5, 0xD8, 0xE2, 0x50, 0xB9, 0x8B, 0xE4,
0x8E, 0x49, 0x5C, 0x1D, 0x60, 0x89, 0xDA, 0xD1,
0x5D, 0xC7, 0xD7, 0xB4, 0x61, 0x54, 0xD6, 0xB6,
0xCE, 0x8E, 0xF4, 0xAD, 0x69, 0xB1, 0x5D, 0x49,
0x82, 0x55, 0x9B, 0x29, 0x7B, 0xCF, 0x18, 0x85,
0xC5, 0x29, 0xF5, 0x66, 0x66, 0x0E, 0x57, 0xEC,
0x68, 0xED, 0xBC, 0x3C, 0x05, 0x72, 0x6C, 0xC0,
0x2F, 0xD4, 0xCB, 0xF4, 0x97, 0x6E, 0xAA, 0x9A,
0xFD, 0x51, 0x38, 0xFE, 0x83, 0x76, 0x43, 0x5B,
0x9F, 0xC6, 0x1D, 0x2F, 0xC0, 0xEB, 0x06, 0xE3
};
static const unsigned char srp_generator = 0x02;
static const unsigned char srp3072_generator = 0x05;
static const unsigned char srp8192_generator = 19;
const gnutls_datum_t gnutls_srp_1024_group_prime = {
(void *) srp_params_1024, sizeof(srp_params_1024)
};
const gnutls_datum_t gnutls_srp_1024_group_generator = {
(void *) &srp_generator, sizeof(srp_generator)
};
static const unsigned char srp_params_1536[] = {
0x9D, 0xEF, 0x3C, 0xAF, 0xB9, 0x39, 0x27, 0x7A, 0xB1,
0xF1, 0x2A, 0x86, 0x17, 0xA4, 0x7B, 0xBB, 0xDB, 0xA5,
0x1D, 0xF4, 0x99, 0xAC, 0x4C, 0x80, 0xBE, 0xEE, 0xA9,
0x61, 0x4B, 0x19, 0xCC, 0x4D, 0x5F, 0x4F, 0x5F, 0x55,
0x6E, 0x27, 0xCB, 0xDE, 0x51, 0xC6, 0xA9, 0x4B, 0xE4,
0x60, 0x7A, 0x29, 0x15, 0x58, 0x90, 0x3B, 0xA0, 0xD0,
0xF8, 0x43, 0x80, 0xB6, 0x55, 0xBB, 0x9A, 0x22, 0xE8,
0xDC, 0xDF, 0x02, 0x8A, 0x7C, 0xEC, 0x67, 0xF0, 0xD0,
0x81, 0x34, 0xB1, 0xC8, 0xB9, 0x79, 0x89, 0x14, 0x9B,
0x60, 0x9E, 0x0B, 0xE3, 0xBA, 0xB6, 0x3D, 0x47, 0x54,
0x83, 0x81, 0xDB, 0xC5, 0xB1, 0xFC, 0x76, 0x4E, 0x3F,
0x4B, 0x53, 0xDD, 0x9D, 0xA1, 0x15, 0x8B, 0xFD, 0x3E,
0x2B, 0x9C, 0x8C, 0xF5, 0x6E, 0xDF, 0x01, 0x95, 0x39,
0x34, 0x96, 0x27, 0xDB, 0x2F, 0xD5, 0x3D, 0x24, 0xB7,
0xC4, 0x86, 0x65, 0x77, 0x2E, 0x43, 0x7D, 0x6C, 0x7F,
0x8C, 0xE4, 0x42, 0x73, 0x4A, 0xF7, 0xCC, 0xB7, 0xAE,
0x83, 0x7C, 0x26, 0x4A, 0xE3, 0xA9, 0xBE, 0xB8, 0x7F,
0x8A, 0x2F, 0xE9, 0xB8, 0xB5, 0x29, 0x2E, 0x5A, 0x02,
0x1F, 0xFF, 0x5E, 0x91, 0x47, 0x9E, 0x8C, 0xE7, 0xA2,
0x8C, 0x24, 0x42, 0xC6, 0xF3, 0x15, 0x18, 0x0F, 0x93,
0x49, 0x9A, 0x23, 0x4D, 0xCF, 0x76, 0xE3, 0xFE, 0xD1,
0x35, 0xF9, 0xBB
};
const gnutls_datum_t gnutls_srp_1536_group_prime = {
(void *) srp_params_1536, sizeof(srp_params_1536)
};
const gnutls_datum_t gnutls_srp_1536_group_generator = {
(void *) &srp_generator, sizeof(srp_generator)
};
static const unsigned char srp_params_2048[] = {
0xAC, 0x6B, 0xDB, 0x41, 0x32, 0x4A, 0x9A, 0x9B, 0xF1,
0x66, 0xDE, 0x5E, 0x13, 0x89, 0x58, 0x2F, 0xAF, 0x72,
0xB6, 0x65, 0x19, 0x87, 0xEE, 0x07, 0xFC, 0x31, 0x92,
0x94, 0x3D, 0xB5, 0x60, 0x50, 0xA3, 0x73, 0x29, 0xCB,
0xB4, 0xA0, 0x99, 0xED, 0x81, 0x93, 0xE0, 0x75, 0x77,
0x67, 0xA1, 0x3D, 0xD5, 0x23, 0x12, 0xAB, 0x4B, 0x03,
0x31, 0x0D, 0xCD, 0x7F, 0x48, 0xA9, 0xDA, 0x04, 0xFD,
0x50, 0xE8, 0x08, 0x39, 0x69, 0xED, 0xB7, 0x67, 0xB0,
0xCF, 0x60, 0x95, 0x17, 0x9A, 0x16, 0x3A, 0xB3, 0x66,
0x1A, 0x05, 0xFB, 0xD5, 0xFA, 0xAA, 0xE8, 0x29, 0x18,
0xA9, 0x96, 0x2F, 0x0B, 0x93, 0xB8, 0x55, 0xF9, 0x79,
0x93, 0xEC, 0x97, 0x5E, 0xEA, 0xA8, 0x0D, 0x74, 0x0A,
0xDB, 0xF4, 0xFF, 0x74, 0x73, 0x59, 0xD0, 0x41, 0xD5,
0xC3, 0x3E, 0xA7, 0x1D, 0x28, 0x1E, 0x44, 0x6B, 0x14,
0x77, 0x3B, 0xCA, 0x97, 0xB4, 0x3A, 0x23, 0xFB, 0x80,
0x16, 0x76, 0xBD, 0x20, 0x7A, 0x43, 0x6C, 0x64, 0x81,
0xF1, 0xD2, 0xB9, 0x07, 0x87, 0x17, 0x46, 0x1A, 0x5B,
0x9D, 0x32, 0xE6, 0x88, 0xF8, 0x77, 0x48, 0x54, 0x45,
0x23, 0xB5, 0x24, 0xB0, 0xD5, 0x7D, 0x5E, 0xA7, 0x7A,
0x27, 0x75, 0xD2, 0xEC, 0xFA, 0x03, 0x2C, 0xFB, 0xDB,
0xF5, 0x2F, 0xB3, 0x78, 0x61, 0x60, 0x27, 0x90, 0x04,
0xE5, 0x7A, 0xE6, 0xAF, 0x87, 0x4E, 0x73, 0x03, 0xCE,
0x53, 0x29, 0x9C, 0xCC, 0x04, 0x1C, 0x7B, 0xC3, 0x08,
0xD8, 0x2A, 0x56, 0x98, 0xF3, 0xA8, 0xD0, 0xC3, 0x82,
0x71, 0xAE, 0x35, 0xF8, 0xE9, 0xDB, 0xFB, 0xB6, 0x94,
0xB5, 0xC8, 0x03, 0xD8, 0x9F, 0x7A, 0xE4, 0x35, 0xDE,
0x23, 0x6D, 0x52, 0x5F, 0x54, 0x75, 0x9B, 0x65, 0xE3,
0x72, 0xFC, 0xD6, 0x8E, 0xF2, 0x0F, 0xA7, 0x11, 0x1F,
0x9E, 0x4A, 0xFF, 0x73
};
const gnutls_datum_t gnutls_srp_2048_group_prime = {
(void *) srp_params_2048, sizeof(srp_params_2048)
};
const gnutls_datum_t gnutls_srp_2048_group_generator = {
(void *) &srp_generator, sizeof(srp_generator)
};
static const unsigned char srp_params_3072[] = {
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xC9,
0x0F, 0xDA, 0xA2, 0x21, 0x68, 0xC2, 0x34, 0xC4, 0xC6,
0x62, 0x8B, 0x80, 0xDC, 0x1C, 0xD1, 0x29, 0x02, 0x4E,
0x08, 0x8A, 0x67, 0xCC, 0x74, 0x02, 0x0B, 0xBE, 0xA6,
0x3B, 0x13, 0x9B, 0x22, 0x51, 0x4A, 0x08, 0x79, 0x8E,
0x34, 0x04, 0xDD, 0xEF, 0x95, 0x19, 0xB3, 0xCD, 0x3A,
0x43, 0x1B, 0x30, 0x2B, 0x0A, 0x6D, 0xF2, 0x5F, 0x14,
0x37, 0x4F, 0xE1, 0x35, 0x6D, 0x6D, 0x51, 0xC2, 0x45,
0xE4, 0x85, 0xB5, 0x76, 0x62, 0x5E, 0x7E, 0xC6, 0xF4,
0x4C, 0x42, 0xE9, 0xA6, 0x37, 0xED, 0x6B, 0x0B, 0xFF,
0x5C, 0xB6, 0xF4, 0x06, 0xB7, 0xED, 0xEE, 0x38, 0x6B,
0xFB, 0x5A, 0x89, 0x9F, 0xA5, 0xAE, 0x9F, 0x24, 0x11,
0x7C, 0x4B, 0x1F, 0xE6, 0x49, 0x28, 0x66, 0x51, 0xEC,
0xE4, 0x5B, 0x3D, 0xC2, 0x00, 0x7C, 0xB8, 0xA1, 0x63,
0xBF, 0x05, 0x98, 0xDA, 0x48, 0x36, 0x1C, 0x55, 0xD3,
0x9A, 0x69, 0x16, 0x3F, 0xA8, 0xFD, 0x24, 0xCF, 0x5F,
0x83, 0x65, 0x5D, 0x23, 0xDC, 0xA3, 0xAD, 0x96, 0x1C,
0x62, 0xF3, 0x56, 0x20, 0x85, 0x52, 0xBB, 0x9E, 0xD5,
0x29, 0x07, 0x70, 0x96, 0x96, 0x6D, 0x67, 0x0C, 0x35,
0x4E, 0x4A, 0xBC, 0x98, 0x04, 0xF1, 0x74, 0x6C, 0x08,
0xCA, 0x18, 0x21, 0x7C, 0x32, 0x90, 0x5E, 0x46, 0x2E,
0x36, 0xCE, 0x3B, 0xE3, 0x9E, 0x77, 0x2C, 0x18, 0x0E,
0x86, 0x03, 0x9B, 0x27, 0x83, 0xA2, 0xEC, 0x07, 0xA2,
0x8F, 0xB5, 0xC5, 0x5D, 0xF0, 0x6F, 0x4C, 0x52, 0xC9,
0xDE, 0x2B, 0xCB, 0xF6, 0x95, 0x58, 0x17, 0x18, 0x39,
0x95, 0x49, 0x7C, 0xEA, 0x95, 0x6A, 0xE5, 0x15, 0xD2,
0x26, 0x18, 0x98, 0xFA, 0x05, 0x10, 0x15, 0x72, 0x8E,
0x5A, 0x8A, 0xAA, 0xC4, 0x2D, 0xAD, 0x33, 0x17, 0x0D,
0x04, 0x50, 0x7A, 0x33, 0xA8, 0x55, 0x21, 0xAB, 0xDF,
0x1C, 0xBA, 0x64, 0xEC, 0xFB, 0x85, 0x04, 0x58, 0xDB,
0xEF, 0x0A, 0x8A, 0xEA, 0x71, 0x57, 0x5D, 0x06, 0x0C,
0x7D, 0xB3, 0x97, 0x0F, 0x85, 0xA6, 0xE1, 0xE4, 0xC7,
0xAB, 0xF5, 0xAE, 0x8C, 0xDB, 0x09, 0x33, 0xD7, 0x1E,
0x8C, 0x94, 0xE0, 0x4A, 0x25, 0x61, 0x9D, 0xCE, 0xE3,
0xD2, 0x26, 0x1A, 0xD2, 0xEE, 0x6B, 0xF1, 0x2F, 0xFA,
0x06, 0xD9, 0x8A, 0x08, 0x64, 0xD8, 0x76, 0x02, 0x73,
0x3E, 0xC8, 0x6A, 0x64, 0x52, 0x1F, 0x2B, 0x18, 0x17,
0x7B, 0x20, 0x0C, 0xBB, 0xE1, 0x17, 0x57, 0x7A, 0x61,
0x5D, 0x6C, 0x77, 0x09, 0x88, 0xC0, 0xBA, 0xD9, 0x46,
0xE2, 0x08, 0xE2, 0x4F, 0xA0, 0x74, 0xE5, 0xAB, 0x31,
0x43, 0xDB, 0x5B, 0xFC, 0xE0, 0xFD, 0x10, 0x8E, 0x4B,
0x82, 0xD1, 0x20, 0xA9, 0x3A, 0xD2, 0xCA, 0xFF, 0xFF,
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF
};
const gnutls_datum_t gnutls_srp_3072_group_generator = {
(void *) &srp3072_generator, sizeof(srp3072_generator)
};
const gnutls_datum_t gnutls_srp_3072_group_prime = {
(void *) srp_params_3072, sizeof(srp_params_3072)
};
static const unsigned char srp_params_4096[] = {
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xC9, 0x0F, 0xDA,
0xA2,
0x21, 0x68, 0xC2, 0x34, 0xC4, 0xC6, 0x62, 0x8B, 0x80, 0xDC, 0x1C,
0xD1,
0x29, 0x02, 0x4E, 0x08, 0x8A, 0x67, 0xCC, 0x74, 0x02, 0x0B, 0xBE,
0xA6,
0x3B, 0x13, 0x9B, 0x22, 0x51, 0x4A, 0x08, 0x79, 0x8E, 0x34, 0x04,
0xDD,
0xEF, 0x95, 0x19, 0xB3, 0xCD, 0x3A, 0x43, 0x1B, 0x30, 0x2B, 0x0A,
0x6D,
0xF2, 0x5F, 0x14, 0x37, 0x4F, 0xE1, 0x35, 0x6D, 0x6D, 0x51, 0xC2,
0x45,
0xE4, 0x85, 0xB5, 0x76, 0x62, 0x5E, 0x7E, 0xC6, 0xF4, 0x4C, 0x42,
0xE9,
0xA6, 0x37, 0xED, 0x6B, 0x0B, 0xFF, 0x5C, 0xB6, 0xF4, 0x06, 0xB7,
0xED,
0xEE, 0x38, 0x6B, 0xFB, 0x5A, 0x89, 0x9F, 0xA5, 0xAE, 0x9F, 0x24,
0x11,
0x7C, 0x4B, 0x1F, 0xE6, 0x49, 0x28, 0x66, 0x51, 0xEC, 0xE4, 0x5B,
0x3D,
0xC2, 0x00, 0x7C, 0xB8, 0xA1, 0x63, 0xBF, 0x05, 0x98, 0xDA, 0x48,
0x36,
0x1C, 0x55, 0xD3, 0x9A, 0x69, 0x16, 0x3F, 0xA8, 0xFD, 0x24, 0xCF,
0x5F,
0x83, 0x65, 0x5D, 0x23, 0xDC, 0xA3, 0xAD, 0x96, 0x1C, 0x62, 0xF3,
0x56,
0x20, 0x85, 0x52, 0xBB, 0x9E, 0xD5, 0x29, 0x07, 0x70, 0x96, 0x96,
0x6D,
0x67, 0x0C, 0x35, 0x4E, 0x4A, 0xBC, 0x98, 0x04, 0xF1, 0x74, 0x6C,
0x08,
0xCA, 0x18, 0x21, 0x7C, 0x32, 0x90, 0x5E, 0x46, 0x2E, 0x36, 0xCE,
0x3B,
0xE3, 0x9E, 0x77, 0x2C, 0x18, 0x0E, 0x86, 0x03, 0x9B, 0x27, 0x83,
0xA2,
0xEC, 0x07, 0xA2, 0x8F, 0xB5, 0xC5, 0x5D, 0xF0, 0x6F, 0x4C, 0x52,
0xC9,
0xDE, 0x2B, 0xCB, 0xF6, 0x95, 0x58, 0x17, 0x18, 0x39, 0x95, 0x49,
0x7C,
0xEA, 0x95, 0x6A, 0xE5, 0x15, 0xD2, 0x26, 0x18, 0x98, 0xFA, 0x05,
0x10,
0x15, 0x72, 0x8E, 0x5A, 0x8A, 0xAA, 0xC4, 0x2D, 0xAD, 0x33, 0x17,
0x0D,
0x04, 0x50, 0x7A, 0x33, 0xA8, 0x55, 0x21, 0xAB, 0xDF, 0x1C, 0xBA,
0x64,
0xEC, 0xFB, 0x85, 0x04, 0x58, 0xDB, 0xEF, 0x0A, 0x8A, 0xEA, 0x71,
0x57,
0x5D, 0x06, 0x0C, 0x7D, 0xB3, 0x97, 0x0F, 0x85, 0xA6, 0xE1, 0xE4,
0xC7,
0xAB, 0xF5, 0xAE, 0x8C, 0xDB, 0x09, 0x33, 0xD7, 0x1E, 0x8C, 0x94,
0xE0,
0x4A, 0x25, 0x61, 0x9D, 0xCE, 0xE3, 0xD2, 0x26, 0x1A, 0xD2, 0xEE,
0x6B,
0xF1, 0x2F, 0xFA, 0x06, 0xD9, 0x8A, 0x08, 0x64, 0xD8, 0x76, 0x02,
0x73,
0x3E, 0xC8, 0x6A, 0x64, 0x52, 0x1F, 0x2B, 0x18, 0x17, 0x7B, 0x20,
0x0C,
0xBB, 0xE1, 0x17, 0x57, 0x7A, 0x61, 0x5D, 0x6C, 0x77, 0x09, 0x88,
0xC0,
0xBA, 0xD9, 0x46, 0xE2, 0x08, 0xE2, 0x4F, 0xA0, 0x74, 0xE5, 0xAB,
0x31,
0x43, 0xDB, 0x5B, 0xFC, 0xE0, 0xFD, 0x10, 0x8E, 0x4B, 0x82, 0xD1,
0x20,
0xA9, 0x21, 0x08, 0x01, 0x1A, 0x72, 0x3C, 0x12, 0xA7, 0x87, 0xE6,
0xD7,
0x88, 0x71, 0x9A, 0x10, 0xBD, 0xBA, 0x5B, 0x26, 0x99, 0xC3, 0x27,
0x18,
0x6A, 0xF4, 0xE2, 0x3C, 0x1A, 0x94, 0x68, 0x34, 0xB6, 0x15, 0x0B,
0xDA,
0x25, 0x83, 0xE9, 0xCA, 0x2A, 0xD4, 0x4C, 0xE8, 0xDB, 0xBB, 0xC2,
0xDB,
0x04, 0xDE, 0x8E, 0xF9, 0x2E, 0x8E, 0xFC, 0x14, 0x1F, 0xBE, 0xCA,
0xA6,
0x28, 0x7C, 0x59, 0x47, 0x4E, 0x6B, 0xC0, 0x5D, 0x99, 0xB2, 0x96,
0x4F,
0xA0, 0x90, 0xC3, 0xA2, 0x23, 0x3B, 0xA1, 0x86, 0x51, 0x5B, 0xE7,
0xED,
0x1F, 0x61, 0x29, 0x70, 0xCE, 0xE2, 0xD7, 0xAF, 0xB8, 0x1B, 0xDD,
0x76,
0x21, 0x70, 0x48, 0x1C, 0xD0, 0x06, 0x91, 0x27, 0xD5, 0xB0, 0x5A,
0xA9,
0x93, 0xB4, 0xEA, 0x98, 0x8D, 0x8F, 0xDD, 0xC1, 0x86, 0xFF, 0xB7,
0xDC,
0x90, 0xA6, 0xC0, 0x8F, 0x4D, 0xF4, 0x35, 0xC9, 0x34, 0x06, 0x31,
0x99,
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF
};
const gnutls_datum_t gnutls_srp_4096_group_generator = {
(void *) &srp3072_generator, sizeof(srp3072_generator)
};
const gnutls_datum_t gnutls_srp_4096_group_prime = {
(void *) srp_params_4096, sizeof(srp_params_4096)
};
static const unsigned char srp_params_8192[] = {
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
0xC9, 0x0F, 0xDA, 0xA2, 0x21, 0x68, 0xC2, 0x34,
0xC4, 0xC6, 0x62, 0x8B, 0x80, 0xDC, 0x1C, 0xD1,
0x29, 0x02, 0x4E, 0x08, 0x8A, 0x67, 0xCC, 0x74,
0x02, 0x0B, 0xBE, 0xA6, 0x3B, 0x13, 0x9B, 0x22,
0x51, 0x4A, 0x08, 0x79, 0x8E, 0x34, 0x04, 0xDD,
0xEF, 0x95, 0x19, 0xB3, 0xCD, 0x3A, 0x43, 0x1B,
0x30, 0x2B, 0x0A, 0x6D, 0xF2, 0x5F, 0x14, 0x37,
0x4F, 0xE1, 0x35, 0x6D, 0x6D, 0x51, 0xC2, 0x45,
0xE4, 0x85, 0xB5, 0x76, 0x62, 0x5E, 0x7E, 0xC6,
0xF4, 0x4C, 0x42, 0xE9, 0xA6, 0x37, 0xED, 0x6B,
0x0B, 0xFF, 0x5C, 0xB6, 0xF4, 0x06, 0xB7, 0xED,
0xEE, 0x38, 0x6B, 0xFB, 0x5A, 0x89, 0x9F, 0xA5,
0xAE, 0x9F, 0x24, 0x11, 0x7C, 0x4B, 0x1F, 0xE6,
0x49, 0x28, 0x66, 0x51, 0xEC, 0xE4, 0x5B, 0x3D,
0xC2, 0x00, 0x7C, 0xB8, 0xA1, 0x63, 0xBF, 0x05,
0x98, 0xDA, 0x48, 0x36, 0x1C, 0x55, 0xD3, 0x9A,
0x69, 0x16, 0x3F, 0xA8, 0xFD, 0x24, 0xCF, 0x5F,
0x83, 0x65, 0x5D, 0x23, 0xDC, 0xA3, 0xAD, 0x96,
0x1C, 0x62, 0xF3, 0x56, 0x20, 0x85, 0x52, 0xBB,
0x9E, 0xD5, 0x29, 0x07, 0x70, 0x96, 0x96, 0x6D,
0x67, 0x0C, 0x35, 0x4E, 0x4A, 0xBC, 0x98, 0x04,
0xF1, 0x74, 0x6C, 0x08, 0xCA, 0x18, 0x21, 0x7C,
0x32, 0x90, 0x5E, 0x46, 0x2E, 0x36, 0xCE, 0x3B,
0xE3, 0x9E, 0x77, 0x2C, 0x18, 0x0E, 0x86, 0x03,
0x9B, 0x27, 0x83, 0xA2, 0xEC, 0x07, 0xA2, 0x8F,
0xB5, 0xC5, 0x5D, 0xF0, 0x6F, 0x4C, 0x52, 0xC9,
0xDE, 0x2B, 0xCB, 0xF6, 0x95, 0x58, 0x17, 0x18,
0x39, 0x95, 0x49, 0x7C, 0xEA, 0x95, 0x6A, 0xE5,
0x15, 0xD2, 0x26, 0x18, 0x98, 0xFA, 0x05, 0x10,
0x15, 0x72, 0x8E, 0x5A, 0x8A, 0xAA, 0xC4, 0x2D,
0xAD, 0x33, 0x17, 0x0D, 0x04, 0x50, 0x7A, 0x33,
0xA8, 0x55, 0x21, 0xAB, 0xDF, 0x1C, 0xBA, 0x64,
0xEC, 0xFB, 0x85, 0x04, 0x58, 0xDB, 0xEF, 0x0A,
0x8A, 0xEA, 0x71, 0x57, 0x5D, 0x06, 0x0C, 0x7D,
0xB3, 0x97, 0x0F, 0x85, 0xA6, 0xE1, 0xE4, 0xC7,
0xAB, 0xF5, 0xAE, 0x8C, 0xDB, 0x09, 0x33, 0xD7,
0x1E, 0x8C, 0x94, 0xE0, 0x4A, 0x25, 0x61, 0x9D,
0xCE, 0xE3, 0xD2, 0x26, 0x1A, 0xD2, 0xEE, 0x6B,
0xF1, 0x2F, 0xFA, 0x06, 0xD9, 0x8A, 0x08, 0x64,
0xD8, 0x76, 0x02, 0x73, 0x3E, 0xC8, 0x6A, 0x64,
0x52, 0x1F, 0x2B, 0x18, 0x17, 0x7B, 0x20, 0x0C,
0xBB, 0xE1, 0x17, 0x57, 0x7A, 0x61, 0x5D, 0x6C,
0x77, 0x09, 0x88, 0xC0, 0xBA, 0xD9, 0x46, 0xE2,
0x08, 0xE2, 0x4F, 0xA0, 0x74, 0xE5, 0xAB, 0x31,
0x43, 0xDB, 0x5B, 0xFC, 0xE0, 0xFD, 0x10, 0x8E,
0x4B, 0x82, 0xD1, 0x20, 0xA9, 0x21, 0x08, 0x01,
0x1A, 0x72, 0x3C, 0x12, 0xA7, 0x87, 0xE6, 0xD7,
0x88, 0x71, 0x9A, 0x10, 0xBD, 0xBA, 0x5B, 0x26,
0x99, 0xC3, 0x27, 0x18, 0x6A, 0xF4, 0xE2, 0x3C,
0x1A, 0x94, 0x68, 0x34, 0xB6, 0x15, 0x0B, 0xDA,
0x25, 0x83, 0xE9, 0xCA, 0x2A, 0xD4, 0x4C, 0xE8,
0xDB, 0xBB, 0xC2, 0xDB, 0x04, 0xDE, 0x8E, 0xF9,
0x2E, 0x8E, 0xFC, 0x14, 0x1F, 0xBE, 0xCA, 0xA6,
0x28, 0x7C, 0x59, 0x47, 0x4E, 0x6B, 0xC0, 0x5D,
0x99, 0xB2, 0x96, 0x4F, 0xA0, 0x90, 0xC3, 0xA2,
0x23, 0x3B, 0xA1, 0x86, 0x51, 0x5B, 0xE7, 0xED,
0x1F, 0x61, 0x29, 0x70, 0xCE, 0xE2, 0xD7, 0xAF,
0xB8, 0x1B, 0xDD, 0x76, 0x21, 0x70, 0x48, 0x1C,
0xD0, 0x06, 0x91, 0x27, 0xD5, 0xB0, 0x5A, 0xA9,
0x93, 0xB4, 0xEA, 0x98, 0x8D, 0x8F, 0xDD, 0xC1,
0x86, 0xFF, 0xB7, 0xDC, 0x90, 0xA6, 0xC0, 0x8F,
0x4D, 0xF4, 0x35, 0xC9, 0x34, 0x02, 0x84, 0x92,
0x36, 0xC3, 0xFA, 0xB4, 0xD2, 0x7C, 0x70, 0x26,
0xC1, 0xD4, 0xDC, 0xB2, 0x60, 0x26, 0x46, 0xDE,
0xC9, 0x75, 0x1E, 0x76, 0x3D, 0xBA, 0x37, 0xBD,
0xF8, 0xFF, 0x94, 0x06, 0xAD, 0x9E, 0x53, 0x0E,
0xE5, 0xDB, 0x38, 0x2F, 0x41, 0x30, 0x01, 0xAE,
0xB0, 0x6A, 0x53, 0xED, 0x90, 0x27, 0xD8, 0x31,
0x17, 0x97, 0x27, 0xB0, 0x86, 0x5A, 0x89, 0x18,
0xDA, 0x3E, 0xDB, 0xEB, 0xCF, 0x9B, 0x14, 0xED,
0x44, 0xCE, 0x6C, 0xBA, 0xCE, 0xD4, 0xBB, 0x1B,
0xDB, 0x7F, 0x14, 0x47, 0xE6, 0xCC, 0x25, 0x4B,
0x33, 0x20, 0x51, 0x51, 0x2B, 0xD7, 0xAF, 0x42,
0x6F, 0xB8, 0xF4, 0x01, 0x37, 0x8C, 0xD2, 0xBF,
0x59, 0x83, 0xCA, 0x01, 0xC6, 0x4B, 0x92, 0xEC,
0xF0, 0x32, 0xEA, 0x15, 0xD1, 0x72, 0x1D, 0x03,
0xF4, 0x82, 0xD7, 0xCE, 0x6E, 0x74, 0xFE, 0xF6,
0xD5, 0x5E, 0x70, 0x2F, 0x46, 0x98, 0x0C, 0x82,
0xB5, 0xA8, 0x40, 0x31, 0x90, 0x0B, 0x1C, 0x9E,
0x59, 0xE7, 0xC9, 0x7F, 0xBE, 0xC7, 0xE8, 0xF3,
0x23, 0xA9, 0x7A, 0x7E, 0x36, 0xCC, 0x88, 0xBE,
0x0F, 0x1D, 0x45, 0xB7, 0xFF, 0x58, 0x5A, 0xC5,
0x4B, 0xD4, 0x07, 0xB2, 0x2B, 0x41, 0x54, 0xAA,
0xCC, 0x8F, 0x6D, 0x7E, 0xBF, 0x48, 0xE1, 0xD8,
0x14, 0xCC, 0x5E, 0xD2, 0x0F, 0x80, 0x37, 0xE0,
0xA7, 0x97, 0x15, 0xEE, 0xF2, 0x9B, 0xE3, 0x28,
0x06, 0xA1, 0xD5, 0x8B, 0xB7, 0xC5, 0xDA, 0x76,
0xF5, 0x50, 0xAA, 0x3D, 0x8A, 0x1F, 0xBF, 0xF0,
0xEB, 0x19, 0xCC, 0xB1, 0xA3, 0x13, 0xD5, 0x5C,
0xDA, 0x56, 0xC9, 0xEC, 0x2E, 0xF2, 0x96, 0x32,
0x38, 0x7F, 0xE8, 0xD7, 0x6E, 0x3C, 0x04, 0x68,
0x04, 0x3E, 0x8F, 0x66, 0x3F, 0x48, 0x60, 0xEE,
0x12, 0xBF, 0x2D, 0x5B, 0x0B, 0x74, 0x74, 0xD6,
0xE6, 0x94, 0xF9, 0x1E, 0x6D, 0xBE, 0x11, 0x59,
0x74, 0xA3, 0x92, 0x6F, 0x12, 0xFE, 0xE5, 0xE4,
0x38, 0x77, 0x7C, 0xB6, 0xA9, 0x32, 0xDF, 0x8C,
0xD8, 0xBE, 0xC4, 0xD0, 0x73, 0xB9, 0x31, 0xBA,
0x3B, 0xC8, 0x32, 0xB6, 0x8D, 0x9D, 0xD3, 0x00,
0x74, 0x1F, 0xA7, 0xBF, 0x8A, 0xFC, 0x47, 0xED,
0x25, 0x76, 0xF6, 0x93, 0x6B, 0xA4, 0x24, 0x66,
0x3A, 0xAB, 0x63, 0x9C, 0x5A, 0xE4, 0xF5, 0x68,
0x34, 0x23, 0xB4, 0x74, 0x2B, 0xF1, 0xC9, 0x78,
0x23, 0x8F, 0x16, 0xCB, 0xE3, 0x9D, 0x65, 0x2D,
0xE3, 0xFD, 0xB8, 0xBE, 0xFC, 0x84, 0x8A, 0xD9,
0x22, 0x22, 0x2E, 0x04, 0xA4, 0x03, 0x7C, 0x07,
0x13, 0xEB, 0x57, 0xA8, 0x1A, 0x23, 0xF0, 0xC7,
0x34, 0x73, 0xFC, 0x64, 0x6C, 0xEA, 0x30, 0x6B,
0x4B, 0xCB, 0xC8, 0x86, 0x2F, 0x83, 0x85, 0xDD,
0xFA, 0x9D, 0x4B, 0x7F, 0xA2, 0xC0, 0x87, 0xE8,
0x79, 0x68, 0x33, 0x03, 0xED, 0x5B, 0xDD, 0x3A,
0x06, 0x2B, 0x3C, 0xF5, 0xB3, 0xA2, 0x78, 0xA6,
0x6D, 0x2A, 0x13, 0xF8, 0x3F, 0x44, 0xF8, 0x2D,
0xDF, 0x31, 0x0E, 0xE0, 0x74, 0xAB, 0x6A, 0x36,
0x45, 0x97, 0xE8, 0x99, 0xA0, 0x25, 0x5D, 0xC1,
0x64, 0xF3, 0x1C, 0xC5, 0x08, 0x46, 0x85, 0x1D,
0xF9, 0xAB, 0x48, 0x19, 0x5D, 0xED, 0x7E, 0xA1,
0xB1, 0xD5, 0x10, 0xBD, 0x7E, 0xE7, 0x4D, 0x73,
0xFA, 0xF3, 0x6B, 0xC3, 0x1E, 0xCF, 0xA2, 0x68,
0x35, 0x90, 0x46, 0xF4, 0xEB, 0x87, 0x9F, 0x92,
0x40, 0x09, 0x43, 0x8B, 0x48, 0x1C, 0x6C, 0xD7,
0x88, 0x9A, 0x00, 0x2E, 0xD5, 0xEE, 0x38, 0x2B,
0xC9, 0x19, 0x0D, 0xA6, 0xFC, 0x02, 0x6E, 0x47,
0x95, 0x58, 0xE4, 0x47, 0x56, 0x77, 0xE9, 0xAA,
0x9E, 0x30, 0x50, 0xE2, 0x76, 0x56, 0x94, 0xDF,
0xC8, 0x1F, 0x56, 0xE8, 0x80, 0xB9, 0x6E, 0x71,
0x60, 0xC9, 0x80, 0xDD, 0x98, 0xED, 0xD3, 0xDF,
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF
};
const gnutls_datum_t gnutls_srp_8192_group_prime = {
(void *) srp_params_8192, sizeof(srp_params_8192)
};
const gnutls_datum_t gnutls_srp_8192_group_generator = {
(void *) &srp8192_generator, sizeof(srp8192_generator)
};
/* Check if G and N are parameters from the SRP draft.
*/
static int
check_g_n(const uint8_t * g, size_t n_g, const uint8_t * n, size_t n_n)
{
if (n_n == sizeof(srp_params_8192)) {
if (memcmp(srp_params_8192, n, n_n) == 0 &&
n_g == 1 && g[0] == srp8192_generator)
return 0;
return
gnutls_assert_val(GNUTLS_E_RECEIVED_ILLEGAL_PARAMETER);
}
if (n_n == sizeof(srp_params_4096)) {
if (memcmp(srp_params_4096, n, n_n) == 0 &&
n_g == 1 && g[0] == srp3072_generator)
return 0;
return
gnutls_assert_val(GNUTLS_E_RECEIVED_ILLEGAL_PARAMETER);
}
if (n_n == sizeof(srp_params_3072)) {
if (memcmp(srp_params_3072, n, n_n) == 0 &&
n_g == 1 && g[0] == srp3072_generator)
return 0;
return
gnutls_assert_val(GNUTLS_E_RECEIVED_ILLEGAL_PARAMETER);
}
/* 2048, 1536 and 1024 */
if (n_g != 1 || g[0] != srp_generator) {
gnutls_assert();
return GNUTLS_E_RECEIVED_ILLEGAL_PARAMETER;
}
if (n_n == sizeof(srp_params_1024) &&
memcmp(srp_params_1024, n, n_n) == 0) {
return 0;
}
if (n_n == sizeof(srp_params_1536) &&
memcmp(srp_params_1536, n, n_n) == 0) {
return 0;
}
if (n_n == sizeof(srp_params_2048) &&
memcmp(srp_params_2048, n, n_n) == 0) {
return 0;
}
gnutls_assert();
return GNUTLS_E_RECEIVED_ILLEGAL_PARAMETER;
}
/* receive the key exchange message ( n, g, s, B)
*/
int
_gnutls_proc_srp_server_kx(gnutls_session_t session, uint8_t * data,
size_t _data_size)
{
uint8_t n_s;
uint16_t n_g, n_n, n_b;
size_t _n_g, _n_n, _n_b;
const uint8_t *data_n;
const uint8_t *data_g;
const uint8_t *data_s;
const uint8_t *data_b;
int i, ret;
uint8_t hd[SRP_MAX_HASH_SIZE];
char *username, *password;
ssize_t data_size = _data_size;
gnutls_srp_client_credentials_t cred;
gnutls_ext_priv_data_t epriv;
srp_ext_st *priv;
ret =
_gnutls_hello_ext_get_priv(session, GNUTLS_EXTENSION_SRP,
&epriv);
if (ret < 0) {
gnutls_assert();
return GNUTLS_E_UNKNOWN_SRP_USERNAME;
}
priv = epriv;
cred = (gnutls_srp_client_credentials_t)
_gnutls_get_cred(session, GNUTLS_CRD_SRP);
if (cred == NULL) {
gnutls_assert();
return GNUTLS_E_INSUFFICIENT_CREDENTIALS;
}
if (priv->username == NULL) {
username = cred->username;
password = cred->password;
} else {
username = priv->username;
password = priv->password;
}
if (username == NULL || password == NULL) {
gnutls_assert();
return GNUTLS_E_INSUFFICIENT_CREDENTIALS;
}
i = 0;
/* Read N
*/
DECR_LEN(data_size, 2);
n_n = _gnutls_read_uint16(&data[i]);
i += 2;
DECR_LEN(data_size, n_n);
data_n = &data[i];
i += n_n;
/* Read G
*/
DECR_LEN(data_size, 2);
n_g = _gnutls_read_uint16(&data[i]);
i += 2;
DECR_LEN(data_size, n_g);
data_g = &data[i];
i += n_g;
/* Read salt
*/
DECR_LEN(data_size, 1);
n_s = data[i];
i += 1;
DECR_LEN(data_size, n_s);
data_s = &data[i];
i += n_s;
/* Read B
*/
DECR_LEN(data_size, 2);
n_b = _gnutls_read_uint16(&data[i]);
i += 2;
DECR_LEN(data_size, n_b);
data_b = &data[i];
i += n_b;
_n_g = n_g;
_n_n = n_n;
_n_b = n_b;
if (_gnutls_mpi_init_scan_nz(&N, data_n, _n_n) != 0) {
gnutls_assert();
return GNUTLS_E_RECEIVED_ILLEGAL_PARAMETER;
}
if (_gnutls_mpi_init_scan_nz(&G, data_g, _n_g) != 0) {
gnutls_assert();
return GNUTLS_E_RECEIVED_ILLEGAL_PARAMETER;
}
if (_gnutls_mpi_init_scan_nz(&B, data_b, _n_b) != 0) {
gnutls_assert();
return GNUTLS_E_RECEIVED_ILLEGAL_PARAMETER;
}
/* Check if the g and n are from the SRP
* draft. Otherwise check if N is a prime and G
* a generator.
*/
if ((ret = check_g_n(data_g, _n_g, data_n, _n_n)) < 0) {
_gnutls_audit_log(session,
"SRP group parameters are not in the white list; rejecting.\n");
return gnutls_assert_val(ret);
}
/* Checks if b % n == 0
*/
if ((ret = check_param_mod_n(B, N, 0)) < 0) {
gnutls_assert();
return ret;
}
/* generate x = SHA(s | SHA(U | ":" | p))
* (or the equivalent using bcrypt)
*/
if ((ret =
_gnutls_calc_srp_x(username, password, (uint8_t *) data_s,
n_s, &_n_g, hd)) < 0) {
gnutls_assert();
return ret;
}
if (_gnutls_mpi_init_scan_nz(&session->key.proto.tls12.srp.x, hd, _n_g) != 0) {
gnutls_assert();
return GNUTLS_E_RECEIVED_ILLEGAL_PARAMETER;
}
return i; /* return the processed data
* needed in auth_srp_rsa.
*/
}
#endif /* ENABLE_SRP */