wpa_supplicant: Initial Revision 0.8.X
Based on:
commit 0725cc7b7efc434910e89865c42eda7ce61bbf08
Author: Jouni Malinen <j@w1.fi>
Date: Thu Apr 21 20:41:01 2011 +0300
Enable CONFIG_DRIVER_NL80211=y in the default configuration
nl80211 should be preferred over WEXT with any recent Linux
kernel version.
Change-Id: I26aec5afbbd4f4a1f5fd900912545b6f5050de64
Signed-off-by: Dmitry Shmidt <dimitrysh@google.com>
diff --git a/src/crypto/crypto_internal-modexp.c b/src/crypto/crypto_internal-modexp.c
new file mode 100644
index 0000000..3124742
--- /dev/null
+++ b/src/crypto/crypto_internal-modexp.c
@@ -0,0 +1,55 @@
+/*
+ * Crypto wrapper for internal crypto implementation - modexp
+ * Copyright (c) 2006-2009, Jouni Malinen <j@w1.fi>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * Alternatively, this software may be distributed under the terms of BSD
+ * license.
+ *
+ * See README and COPYING for more details.
+ */
+
+#include "includes.h"
+
+#include "common.h"
+#include "tls/bignum.h"
+#include "crypto.h"
+
+
+int crypto_mod_exp(const u8 *base, size_t base_len,
+ const u8 *power, size_t power_len,
+ const u8 *modulus, size_t modulus_len,
+ u8 *result, size_t *result_len)
+{
+ struct bignum *bn_base, *bn_exp, *bn_modulus, *bn_result;
+ int ret = -1;
+
+ bn_base = bignum_init();
+ bn_exp = bignum_init();
+ bn_modulus = bignum_init();
+ bn_result = bignum_init();
+
+ if (bn_base == NULL || bn_exp == NULL || bn_modulus == NULL ||
+ bn_result == NULL)
+ goto error;
+
+ if (bignum_set_unsigned_bin(bn_base, base, base_len) < 0 ||
+ bignum_set_unsigned_bin(bn_exp, power, power_len) < 0 ||
+ bignum_set_unsigned_bin(bn_modulus, modulus, modulus_len) < 0)
+ goto error;
+
+ if (bignum_exptmod(bn_base, bn_exp, bn_modulus, bn_result) < 0)
+ goto error;
+
+ ret = bignum_get_unsigned_bin(bn_result, result, result_len);
+
+error:
+ bignum_deinit(bn_base);
+ bignum_deinit(bn_exp);
+ bignum_deinit(bn_modulus);
+ bignum_deinit(bn_result);
+ return ret;
+}