/*
* Copyright (c) 2001-2006 Nokia Corporation and/or its subsidiary(-ies).
* All rights reserved.
* This component and the accompanying materials are made available
* under the terms of the License "Eclipse Public License v1.0"
* which accompanies this distribution, and is available
* at the URL "http://www.eclipse.org/legal/epl-v10.html".
*
* Initial Contributors:
* Nokia Corporation - initial contribution.
*
* Contributors:
*
* Description: EAP and WLAN authentication protocols.
*
*/
/*
* %version: 12 %
*/
// This is enumeration of EAPOL source code.
#if defined(USE_EAP_MINIMUM_RELEASE_TRACES)
#undef EAP_FILE_NUMBER_ENUM
#define EAP_FILE_NUMBER_ENUM 8
#undef EAP_FILE_NUMBER_DATE
#define EAP_FILE_NUMBER_DATE 1127594498
#endif //#if defined(USE_EAP_MINIMUM_RELEASE_TRACES)
#include "eap_am_memory.h"
#include "dss_random.h"
#include "eap_am_assert.h"
#include "abs_eap_am_crypto.h"
#include <openssl/bn.h>
#include "eap_am_crypto_sha1.h"
/** @file */
/** This is the block size in bytes. */
static const u32_t BLOCK_SIZE = 160/8;
static const u32_t DEBUG_BUFFER_SIZE = 80;
/**
* dss_random_G() implements the G() function using modified SHA-1.
* @code
* Copied from "Multiple Examples of DSA" http://csrc.nist.gov/encryption/dss/Examples-1024bit.pdf.
* Using the revised algorithm found in the Change Notice for the generation of x values:
* XKEY= bd029bbe 7f51960b cf9edb2b 61f06f0f eb5a38b6
* XSEED= 00000000 00000000 00000000 00000000 00000000
* The first loop through step 3.2 provides:
* XVAL= bd029bbe 7f51960b cf9edb2b 61f06f0f eb5a38b6
* Using the routine in Appendix 3.3 Constructing The Function G From SHA-1
* provides:
* w[0]= 2070b322 3dba372f de1c0ffc 7b2e3b49 8b260614
* The following value is the updated XKEY value from step 3.2.c:
* XKEY= dd734ee0 bd0bcd3b adbaeb27 dd1eaa59 76803ecb
* The second loop through step 3.2 provides:
* XVAL= dd734ee0 bd0bcd3b adbaeb27 dd1eaa59 76803ecb
* Using the routine in Appendix 3.3 Constructing The Function G From SHA-1
* provides:
* w[1]= 3c6c18ba cb0f6c55 babb1378 8e20d737 a3275116
* The following value is the updated XKEY value from step 3.2.c:
* XKEY= 19df679b 881b3991 6875fea0 6b3f8191 19a78fe2
* Step 3.3 provides the following values:
* w[0] || w[1]= 2070b322 3dba372f de1c0ffc 7b2e3b49 8b260614
* 3c6c18ba cb0f6c55 babb1378 8e20d737 a3275116
* X= 47c27eb6 16dba413 91e5165b e9c5e397 7e39a15d
* @endcode
*/
void dss_random_G(abs_eap_am_tools_c * const m_am_tools, u8_t *out, u32_t out_length, u8_t *c, u32_t c_length)
{
u32_t *out_array = reinterpret_cast<u32_t *>(out);
EAP_ASSERT(out_length == BLOCK_SIZE);
EAP_ASSERT(c_length == BLOCK_SIZE);
{
eap_am_crypto_sha1_c sha1(m_am_tools);
u32_t output_length = out_length;
eap_status_e status = sha1.eap_sha1_dss_G_function(
c,
c_length,
out_array,
&output_length
);
if (status != eap_status_ok)
{
EAP_TRACE_DEBUG(m_am_tools, TRACE_FLAGS_EAP_AM_CRYPTO, (EAPL("eap_sha1_dss_G_function(): status = %d"),
status));
}
}
}
/**
* dss_pseudo_random() implements pseudo random function for key genearation of EAP/SIM.
* @code
* Random generator becomes as follows:
* Step 1. Choose a new, secret value for the seed-key, XKEY.
* Step 2. In hexadecimal notation let
* t = 67452301 EFCDAB89 98BADCFE 10325476 C3D2E1F0.
* This is the initial value for H0 || H1 || H2 || H3 || H4 in the SHS.
* Step 3. For j = 0 to m - 1 do
* c. xj = G(t,XKEY).
* d. XKEY = (1 + XKEY + xj) mod 2^b.
* @endcode
*/
eap_status_e dss_pseudo_random(abs_eap_am_tools_c * const m_am_tools, u8_t *out, u32_t out_length, u8_t *xkey, u32_t xkey_length)
{
u32_t block_count = out_length/BLOCK_SIZE;
if ((out_length % BLOCK_SIZE) != 0)
{
EAP_TRACE_DEBUG(
m_am_tools,
TRACE_FLAGS_DEFAULT,
(EAPL("ERROR: dss_pseudo_random(): out buffer length 0x%08x not aligned to 0x%08x.\n"),
out_length, BLOCK_SIZE));
return eap_status_data_length_not_aligned_to_block_size;
}
if (xkey == 0
|| out == 0)
{
return eap_status_illegal_parameter;
}
u8_t tmp_xkey[BLOCK_SIZE];
m_am_tools->memmove(tmp_xkey, xkey, BLOCK_SIZE);
BN_CTX *ctx;
BIGNUM bn_mod, bn_xkey, bn_xj, bn_one, bn_160, bn_tmp;
ctx=BN_CTX_new();
BN_init(&bn_mod);
BN_init(&bn_tmp);
BN_init(&bn_xkey);
BN_init(&bn_xj);
BN_init(&bn_one);
BN_init(&bn_160);
BN_set_word(&bn_one, 1);
BN_set_word(&bn_mod, 2);
BN_set_word(&bn_160, 160);
// bn_mod = 2^160
BN_exp(&bn_mod, &bn_mod, &bn_160, ctx);
EAP_TRACE_DATA_DEBUG(m_am_tools, TRACE_FLAGS_EAP_AM_CRYPTO, (EAPL("dss_pseudo_random(): mod"),
bn_mod.d, bn_mod.top*sizeof(BN_ULONG)));
EAP_TRACE_DATA_DEBUG(m_am_tools, TRACE_FLAGS_EAP_AM_CRYPTO, (EAPL("xkey[0]"),
xkey, xkey_length));
for (u32_t ind = 0; ind < block_count; ind++)
{
u8_t debug_buffer[DEBUG_BUFFER_SIZE];
EAP_UNREFERENCED_PARAMETER(debug_buffer);
dss_random_G(m_am_tools, &(out[ind*BLOCK_SIZE]), BLOCK_SIZE, tmp_xkey, BLOCK_SIZE);
EAP_TRACE_FORMAT(m_am_tools, (debug_buffer, DEBUG_BUFFER_SIZE, EAPL("w[%d] "), ind));
EAP_TRACE_DEBUG(m_am_tools, TRACE_FLAGS_EAP_AM_CRYPTO, (EAPL("dss_pseudo_random(): %s = G(xkey[%d])\n"),
debug_buffer,
ind));
EAP_TRACE_DATA_DEBUG(m_am_tools, TRACE_FLAGS_EAP_AM_CRYPTO, (reinterpret_cast<eap_format_string>(debug_buffer),
&(out[ind*BLOCK_SIZE]), BLOCK_SIZE));
if (ind+1u >= block_count)
{
break;
}
BN_bin2bn(static_cast<u8_t *>(tmp_xkey), BLOCK_SIZE, &bn_xkey);
// tmp = (xkey + 1) % mod
BN_mod_add(&bn_tmp, &bn_xkey, &bn_one, &bn_mod, ctx);
EAP_TRACE_DEBUG(m_am_tools, TRACE_FLAGS_EAP_AM_CRYPTO, (EAPL("dss_pseudo_random(): tmp[%d] = (xkey[%d] + 1) % mod\n"),
ind,
ind));
EAP_TRACE_FORMAT(m_am_tools, (debug_buffer, DEBUG_BUFFER_SIZE, EAPL("tmp[%d] "), ind));
EAP_TRACE_DATA_DEBUG(m_am_tools, TRACE_FLAGS_EAP_AM_CRYPTO, (reinterpret_cast<eap_format_string>(debug_buffer),
bn_tmp.d, bn_tmp.top*sizeof(BN_ULONG)));
BN_bin2bn(static_cast<u8_t *>(&(out[ind*BLOCK_SIZE])), BLOCK_SIZE, &bn_xj);
// xkey = (tmp + xj) % mod
BN_mod_add(&bn_xkey, &bn_tmp, &bn_xj, &bn_mod, ctx);
BN_bn2bin(&bn_xkey, static_cast<u8_t *>(tmp_xkey));
EAP_TRACE_DEBUG(m_am_tools, TRACE_FLAGS_EAP_AM_CRYPTO, (EAPL("dss_pseudo_random(): xkey[%d] = (tmp + x[%d]) % mod\n"),
ind+1u,
ind));
EAP_TRACE_FORMAT(m_am_tools, (debug_buffer, DEBUG_BUFFER_SIZE, EAPL("xkey[%d]"), ind+1u));
EAP_TRACE_DATA_DEBUG(m_am_tools, TRACE_FLAGS_EAP_AM_CRYPTO, (reinterpret_cast<eap_format_string>(debug_buffer),
tmp_xkey, sizeof(tmp_xkey)));
}
BN_free(&bn_mod);
BN_free(&bn_tmp);
BN_free(&bn_xkey);
BN_free(&bn_xj);
BN_free(&bn_one);
BN_free(&bn_160);
BN_CTX_free(ctx);
return eap_status_ok;
}
// End.