author | Pat Downey <patd@symbian.org> |
Wed, 01 Sep 2010 12:23:57 +0100 | |
branch | RCL_3 |
changeset 46 | c74b3d9f6b9e |
parent 45 | bad0cc58d154 |
permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 2001-2006 Nokia Corporation and/or its subsidiary(-ies). |
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* All rights reserved. |
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* This component and the accompanying materials are made available |
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* under the terms of the License "Eclipse Public License v1.0" |
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* which accompanies this distribution, and is available |
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* at the URL "http://www.eclipse.org/legal/epl-v10.html". |
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* |
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* Initial Contributors: |
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* Nokia Corporation - initial contribution. |
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* |
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* Contributors: |
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* |
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* Description: EAP and WLAN authentication protocols. |
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* |
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*/ |
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|
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/* |
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* %version: 12 % |
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*/ |
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// This is enumeration of EAPOL source code. |
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#if defined(USE_EAP_MINIMUM_RELEASE_TRACES) |
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#undef EAP_FILE_NUMBER_ENUM |
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#define EAP_FILE_NUMBER_ENUM 142 |
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#undef EAP_FILE_NUMBER_DATE |
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#define EAP_FILE_NUMBER_DATE 1127594498 |
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#endif //#if defined(USE_EAP_MINIMUM_RELEASE_TRACES) |
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#include <bigint.h> |
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#include "dss_random.h" |
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#include "eap_am_assert.h" |
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#include "abs_eap_am_crypto.h" |
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#include "eap_am_crypto_sha1.h" |
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/** @file */ |
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/** This is the block size in bytes. */ |
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const u32_t BLOCK_SIZE = 160/8; |
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|
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#if defined(EAP_DEBUG_TRACE_ACTIVE) |
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const u32_t DEBUG_BUFFER_SIZE = 64; |
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#endif //#if defined(EAP_DEBUG_TRACE_ACTIVE) |
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LOCAL_C void dss_pseudo_randomL(abs_eap_am_tools_c * const m_am_tools, u8_t *out, u32_t out_length, u8_t *xkey, u32_t xkey_length); |
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/** |
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* dss_random_G() implements the G() function using modified SHA-1. |
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* @code |
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* Copied from "Multiple Examples of DSA" http://csrc.nist.gov/encryption/dss/Examples-1024bit.pdf. |
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* Using the revised algorithm found in the Change Notice for the generation of x values: |
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* XKEY= bd029bbe 7f51960b cf9edb2b 61f06f0f eb5a38b6 |
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* XSEED= 00000000 00000000 00000000 00000000 00000000 |
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* The first loop through step 3.2 provides: |
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* XVAL= bd029bbe 7f51960b cf9edb2b 61f06f0f eb5a38b6 |
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* Using the routine in Appendix 3.3 Constructing The Function G From SHA-1 |
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* provides: |
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* w[0]= 2070b322 3dba372f de1c0ffc 7b2e3b49 8b260614 |
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* The following value is the updated XKEY value from step 3.2.c: |
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* XKEY= dd734ee0 bd0bcd3b adbaeb27 dd1eaa59 76803ecb |
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* The second loop through step 3.2 provides: |
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* XVAL= dd734ee0 bd0bcd3b adbaeb27 dd1eaa59 76803ecb |
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* Using the routine in Appendix 3.3 Constructing The Function G From SHA-1 |
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* provides: |
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* w[1]= 3c6c18ba cb0f6c55 babb1378 8e20d737 a3275116 |
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* The following value is the updated XKEY value from step 3.2.c: |
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* XKEY= 19df679b 881b3991 6875fea0 6b3f8191 19a78fe2 |
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* Step 3.3 provides the following values: |
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* w[0] || w[1]= 2070b322 3dba372f de1c0ffc 7b2e3b49 8b260614 |
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* 3c6c18ba cb0f6c55 babb1378 8e20d737 a3275116 |
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* X= 47c27eb6 16dba413 91e5165b e9c5e397 7e39a15d |
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* @endcode |
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*/ |
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void dss_random_G(abs_eap_am_tools_c * const m_am_tools, u8_t *out, u32_t out_length, const u8_t *c, u32_t c_length) |
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{ |
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u32_t *out_array = reinterpret_cast<u32_t *>(out); |
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eap_am_crypto_sha1_c sha1(m_am_tools); |
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u32_t output_length = out_length; |
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eap_status_e status = sha1.eap_sha1_dss_G_function( |
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c, |
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c_length, |
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out_array, |
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&output_length |
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); |
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if (status != eap_status_ok) |
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{ |
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EAP_TRACE_DEBUG(m_am_tools, TRACE_FLAGS_EAP_AM_CRYPTO, (EAPL("eap_sha1_dss_G_function(): status = %d"), |
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status)); |
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} |
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EAP_TRACE_DATA_DEBUG(m_am_tools, TRACE_FLAGS_EAP_AM_CRYPTO, (EAPL("dss_random_G(): out_array"), |
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out_array, sizeof(out_array)*5)); |
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} |
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103 |
|
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/** |
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* dss_pseudo_random() implements pseudo random function for key generation of EAP/SIM. |
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* @code |
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* Random generator becomes as follows: |
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* Step 1. Choose a new, secret value for the seed-key, XKEY. |
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* Step 2. In hexadecimal notation let |
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* t = 67452301 EFCDAB89 98BADCFE 10325476 C3D2E1F0. |
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* This is the initial value for H0 || H1 || H2 || H3 || H4 in the SHS. |
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* Step 3. For j = 0 to m - 1 do |
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* c. xj = G(t,XKEY). |
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* d. XKEY = (1 + XKEY + xj) mod 2^b. |
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* @endcode |
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*/ |
46 | 117 |
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) |
0
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118 |
{ |
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EAP_TRACE_BEGIN(m_am_tools, TRACE_FLAGS_DEFAULT); |
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eap_status_e status = eap_status_ok; |
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__UHEAP_MARK; |
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122 |
|
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TRAPD(err, dss_pseudo_randomL(m_am_tools, out, out_length, xkey, xkey_length)); |
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if (err != KErrNone) |
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125 |
{ |
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return EAP_STATUS_RETURN(m_am_tools, eap_status_allocation_error); |
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} |
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128 |
|
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EAP_TRACE_END(m_am_tools, TRACE_FLAGS_DEFAULT); |
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__UHEAP_MARKEND; |
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return status; |
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} |
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133 |
|
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LOCAL_C void dss_pseudo_randomL(abs_eap_am_tools_c * const m_am_tools, u8_t *out, u32_t out_length, u8_t *xkey, u32_t xkey_length) |
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135 |
{ |
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EAP_UNREFERENCED_PARAMETER(xkey_length); |
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137 |
|
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u32_t block_count = out_length/BLOCK_SIZE; |
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if ((out_length % BLOCK_SIZE) != 0) |
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140 |
{ |
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EAP_TRACE_DEBUG( |
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m_am_tools, |
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TRACE_FLAGS_DEFAULT, |
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(EAPL("ERROR: dss_pseudo_random(): out buffer length 0x%08x not aligned to 0x%08x.\n"), |
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out_length, BLOCK_SIZE)); |
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146 |
|
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User::Leave(KErrArgument); |
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} |
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149 |
|
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TBuf8<BLOCK_SIZE> tmp_out; |
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TBuf8<BLOCK_SIZE> tmp_xkey; |
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152 |
|
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tmp_xkey.Append(xkey, BLOCK_SIZE); |
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154 |
|
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#if defined(EAP_DEBUG_TRACE_ACTIVE) |
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u8_t debug_buffer[DEBUG_BUFFER_SIZE]; |
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#endif //#if defined(EAP_DEBUG_TRACE_ACTIVE) |
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|
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EAP_TRACE_DATA_DEBUG( |
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160 |
m_am_tools, |
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TRACE_FLAGS_EAP_AM_CRYPTO, |
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(EAPL("dss_pseudo_random(): xkey"), |
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xkey, xkey_length)); |
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164 |
|
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RInteger bn_xkey = RInteger::NewL(tmp_xkey); |
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CleanupStack::PushL(bn_xkey); |
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167 |
|
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RInteger bn_two = RInteger::NewL(2); |
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CleanupStack::PushL(bn_two); |
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170 |
|
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RInteger bn_160 = RInteger::NewL(160); |
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CleanupStack::PushL(bn_160); |
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173 |
|
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// Calculate 2^160 |
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RInteger bn_mod = bn_two.ExponentiateL(bn_160); |
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176 |
|
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CleanupStack::PopAndDestroy(&bn_160); |
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CleanupStack::PopAndDestroy(&bn_two); |
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179 |
|
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CleanupStack::PushL(bn_mod); |
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181 |
|
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for (u32_t ind = 0; ind < block_count; ind++) |
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{ |
46 | 184 |
dss_random_G(m_am_tools, &(out[ind*BLOCK_SIZE]), BLOCK_SIZE, tmp_xkey.Ptr(), BLOCK_SIZE); |
0
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185 |
|
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EAP_TRACE_DATA_DEBUG( |
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m_am_tools, |
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TRACE_FLAGS_EAP_AM_CRYPTO, |
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(EAPL("dss_pseudo_random(): xj = G(xkey)"), |
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&(out[ind*BLOCK_SIZE]), BLOCK_SIZE)); |
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191 |
|
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if (ind+1u >= block_count) |
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{ |
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break; |
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} |
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|
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// Get the calculated block to be used |
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tmp_out.Copy(&(out[ind*BLOCK_SIZE]), BLOCK_SIZE); |
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|
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// This must be constructed inside the loop because the only way |
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// to assign descriptor values to CInteger seems to be by using NewLC. |
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RInteger bn_xj = RInteger::NewL(tmp_out); |
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CleanupStack::PushL(bn_xj); |
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|
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// Calculate bn_xkey = (XKEY + 1 + xj) mod 2^b |
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bn_xkey += 1; |
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bn_xkey += bn_xj; |
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bn_xkey %= bn_mod; |
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// New tmp_xkey |
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tmp_xkey.Copy(bn_xkey.BufferLC()->Des()); |
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|
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CleanupStack::PopAndDestroy(); // bn_xkey buffer |
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CleanupStack::PopAndDestroy(&bn_xj); |
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|
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EAP_TRACE_DEBUG( |
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m_am_tools, |
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TRACE_FLAGS_EAP_AM_CRYPTO, |
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(EAPL("dss_pseudo_random(): xkey[%d] = (1 + xkey[%d] + x[%d]) % mod\n"), |
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ind+1u, |
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ind, |
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ind)); |
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|
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EAP_TRACE_FORMAT( |
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m_am_tools, |
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(debug_buffer, |
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sizeof(debug_buffer), |
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EAPL("xkey[%d]"), |
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ind+1u)); |
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|
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EAP_TRACE_DATA_DEBUG( |
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m_am_tools, |
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TRACE_FLAGS_EAP_AM_CRYPTO, |
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((eap_format_string)debug_buffer, |
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tmp_xkey.Ptr(), |
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tmp_xkey.Length())); |
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|
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} // for() |
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|
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CleanupStack::PopAndDestroy(&bn_mod); |
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CleanupStack::PopAndDestroy(&bn_xkey); |
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} |
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|
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|
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// End. |