Removed the 'gnutls_' prefix from files to simplify file naming

1 files changed, 973 insertions, 0 deletions

diff --git a/lib/auth/srp_kx.c b/lib/auth/srp_kx.c
new file mode 100644
index 0000000000..ec13894d19
--- /dev/null
+++ b/lib/auth/srp_kx.c
@@ -0,0 +1,973 @@
+/*
+ * 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 <http://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.b
+#define B session->key.B
+#define _a session->key.a
+#define A session->key.A
+#define N session->key.srp_p
+#define G session->key.srp_g
+#define V session->key.x
+#define S session->key.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;
+	extension_priv_data_t epriv;
+	srp_ext_st *priv;
+
+	ret =
+	    _gnutls_ext_get_session_data(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_set(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;
+	}
+
+	/* 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_MPI_SCAN_FAILED;
+		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_MPI_SCAN_FAILED;
+		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_MPI_SCAN_FAILED;
+		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;
+
+      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;
+	extension_priv_data_t epriv;
+	srp_ext_st *priv;
+
+	ret =
+	    _gnutls_ext_get_session_data(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.u = _gnutls_calc_srp_u(A, B, N);
+	if (session->key.u == NULL) {
+		gnutls_assert();
+		return GNUTLS_E_MEMORY_ERROR;
+	}
+
+	_gnutls_mpi_log("SRP U: ", session->key.u);
+
+	/* S = (B - g^x) ^ (a + u * x) % N */
+	S = _gnutls_calc_srp_S2(B, G, session->key.x, _a, session->key.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.u);
+	zrelease_temp_mpi_key(&B);
+
+	ret = _gnutls_mpi_dprint(session->key.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)
+{
+	size_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_MPI_SCAN_FAILED;
+	}
+
+	_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.u = _gnutls_calc_srp_u(A, B, N);
+	if (session->key.u == NULL) {
+		gnutls_assert();
+		return GNUTLS_E_MEMORY_ERROR;
+	}
+
+	_gnutls_mpi_log("SRP U: ", session->key.u);
+
+	/* S = (A * v^u) ^ b % N 
+	 */
+	S = _gnutls_calc_srp_S1(A, _b, session->key.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.u);
+	zrelease_temp_mpi_key(&B);
+
+	ret = _gnutls_mpi_dprint(session->key.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;
+
+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)
+};
+
+/* 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_3072) &&
+	     memcmp(srp_params_3072, n, n_n) == 0) ||
+	    (n_n == sizeof(srp_params_4096) &&
+	     memcmp(srp_params_4096, n, n_n) == 0)) {
+		if (n_g != 1 || g[0] != srp3072_generator) {
+			return
+			    gnutls_assert_val
+			    (GNUTLS_E_RECEIVED_ILLEGAL_PARAMETER);
+		}
+		return 0;
+	}
+
+	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;
+}
+
+/* Check if N is a prime and G a generator of the
+ * group. This check is only done if N is big enough.
+ * Otherwise only the included parameters must be used.
+ */
+static int
+group_check_g_n(gnutls_session_t session, bigint_t g, bigint_t n)
+{
+	bigint_t q = NULL, two = NULL, w = NULL;
+	int ret;
+
+	if (_gnutls_mpi_get_nbits(n) < (session->internals.srp_prime_bits
+					? session->internals.srp_prime_bits
+					: 2048)) {
+		gnutls_assert();
+		return GNUTLS_E_RECEIVED_ILLEGAL_PARAMETER;
+	}
+
+	/* N must be of the form N=2q+1
+	 * where q is also a prime.
+	 */
+	if (_gnutls_prime_check(n) != 0) {
+		_gnutls_mpi_log("no prime N: ", n);
+		gnutls_assert();
+		return GNUTLS_E_RECEIVED_ILLEGAL_PARAMETER;
+	}
+
+	ret = _gnutls_mpi_init_multi(&two, &q, &w, NULL);
+	if (ret < 0) {
+		gnutls_assert();
+		return ret;
+	}
+
+	/* q = n-1 
+	 */
+	ret = _gnutls_mpi_sub_ui(q, n, 1);
+	if (ret < 0) {
+		gnutls_assert();
+		goto error;
+	}
+
+	/* q = q/2, remember that q is divisible by 2 (prime - 1)
+	 */
+	ret = _gnutls_mpi_set_ui(two, 2);
+	if (ret < 0) {
+		gnutls_assert();
+		goto error;
+	}
+
+	ret = _gnutls_mpi_div(q, q, two);
+	if (ret < 0) {
+		gnutls_assert();
+		goto error;
+	}
+
+	if (_gnutls_prime_check(q) != 0) {
+		/* N was not on the form N=2q+1, where q = prime
+		 */
+		_gnutls_mpi_log("no prime Q: ", q);
+		gnutls_assert();
+		ret = GNUTLS_E_RECEIVED_ILLEGAL_PARAMETER;
+		goto error;
+	}
+
+	/* We also check whether g is a generator,
+	 */
+
+	/* check if g < q < N
+	 */
+	if (_gnutls_mpi_cmp(g, q) >= 0) {
+		gnutls_assert();
+		ret = GNUTLS_E_RECEIVED_ILLEGAL_PARAMETER;
+		goto error;
+	}
+
+	/* check if g^q mod N == N-1
+	 * w = g^q mod N
+	 */
+	ret = _gnutls_mpi_powm(w, g, q, n);
+	if (ret < 0) {
+		gnutls_assert();
+		goto error;
+	}
+
+	/* w++
+	 */
+	ret = _gnutls_mpi_add_ui(w, w, 1);
+	if (ret < 0) {
+		gnutls_assert();
+		goto error;
+	}
+
+	if (_gnutls_mpi_cmp(w, n) != 0) {
+		gnutls_assert();
+		ret = GNUTLS_E_RECEIVED_ILLEGAL_PARAMETER;
+		goto error;
+	}
+
+	ret = 0;
+
+      error:
+	_gnutls_mpi_release(&q);
+	_gnutls_mpi_release(&two);
+	_gnutls_mpi_release(&w);
+
+	return ret;
+
+}
+
+/* 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;
+	extension_priv_data_t epriv;
+	srp_ext_st *priv;
+
+	ret =
+	    _gnutls_ext_get_session_data(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_MPI_SCAN_FAILED;
+	}
+
+	if (_gnutls_mpi_init_scan_nz(&G, data_g, _n_g) != 0) {
+		gnutls_assert();
+		return GNUTLS_E_MPI_SCAN_FAILED;
+	}
+
+	if (_gnutls_mpi_init_scan_nz(&B, data_b, _n_b) != 0) {
+		gnutls_assert();
+		return GNUTLS_E_MPI_SCAN_FAILED;
+	}
+
+
+	/* 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. Checking validity.\n");
+		if ((ret = group_check_g_n(session, G, N)) < 0) {
+			gnutls_assert();
+			return 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.x, hd, _n_g) != 0) {
+		gnutls_assert();
+		return GNUTLS_E_MPI_SCAN_FAILED;
+	}
+
+
+	return i;		/* return the processed data
+				 * needed in auth_srp_rsa.
+				 */
+}
+
+#endif				/* ENABLE_SRP */