/*
* 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 142
#undef EAP_FILE_NUMBER_DATE
#define EAP_FILE_NUMBER_DATE 1127594498
#endif //#if defined(USE_EAP_MINIMUM_RELEASE_TRACES)
#include <bigint.h>
#include "dss_random.h"
#include "eap_am_assert.h"
#include "abs_eap_am_crypto.h"
#include "eap_am_crypto_sha1.h"
/** @file */
/** This is the block size in bytes. */
const u32_t BLOCK_SIZE = 160/8;
#if defined(EAP_DEBUG_TRACE_ACTIVE)
const u32_t DEBUG_BUFFER_SIZE = 64;
#endif //#if defined(EAP_DEBUG_TRACE_ACTIVE)
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);
/**
* 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, const u8_t *c, u32_t c_length)
{
u32_t *out_array = reinterpret_cast<u32_t *>(out);
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));
}
EAP_TRACE_DATA_DEBUG(m_am_tools, TRACE_FLAGS_EAP_AM_CRYPTO, (EAPL("dss_random_G(): out_array"),
out_array, sizeof(out_array)*5));
}
/**
* dss_pseudo_random() implements pseudo random function for key generation 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)
{
EAP_TRACE_BEGIN(m_am_tools, TRACE_FLAGS_DEFAULT);
eap_status_e status = eap_status_ok;
__UHEAP_MARK;
TRAPD(err, dss_pseudo_randomL(m_am_tools, out, out_length, xkey, xkey_length));
if (err != KErrNone)
{
return EAP_STATUS_RETURN(m_am_tools, eap_status_allocation_error);
}
EAP_TRACE_END(m_am_tools, TRACE_FLAGS_DEFAULT);
__UHEAP_MARKEND;
return status;
}
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)
{
EAP_UNREFERENCED_PARAMETER(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));
User::Leave(KErrArgument);
}
TBuf8<BLOCK_SIZE> tmp_out;
TBuf8<BLOCK_SIZE> tmp_xkey;
tmp_xkey.Append(xkey, BLOCK_SIZE);
#if defined(EAP_DEBUG_TRACE_ACTIVE)
u8_t debug_buffer[DEBUG_BUFFER_SIZE];
#endif //#if defined(EAP_DEBUG_TRACE_ACTIVE)
EAP_TRACE_DATA_DEBUG(
m_am_tools,
TRACE_FLAGS_EAP_AM_CRYPTO,
(EAPL("dss_pseudo_random(): xkey"),
xkey, xkey_length));
RInteger bn_xkey = RInteger::NewL(tmp_xkey);
CleanupStack::PushL(bn_xkey);
RInteger bn_two = RInteger::NewL(2);
CleanupStack::PushL(bn_two);
RInteger bn_160 = RInteger::NewL(160);
CleanupStack::PushL(bn_160);
// Calculate 2^160
RInteger bn_mod = bn_two.ExponentiateL(bn_160);
CleanupStack::PopAndDestroy(&bn_160);
CleanupStack::PopAndDestroy(&bn_two);
CleanupStack::PushL(bn_mod);
for (u32_t ind = 0; ind < block_count; ind++)
{
dss_random_G(m_am_tools, &(out[ind*BLOCK_SIZE]), BLOCK_SIZE, tmp_xkey.Ptr(), BLOCK_SIZE);
EAP_TRACE_DATA_DEBUG(
m_am_tools,
TRACE_FLAGS_EAP_AM_CRYPTO,
(EAPL("dss_pseudo_random(): xj = G(xkey)"),
&(out[ind*BLOCK_SIZE]), BLOCK_SIZE));
if (ind+1u >= block_count)
{
break;
}
// Get the calculated block to be used
tmp_out.Copy(&(out[ind*BLOCK_SIZE]), BLOCK_SIZE);
// This must be constructed inside the loop because the only way
// to assign descriptor values to CInteger seems to be by using NewLC.
RInteger bn_xj = RInteger::NewL(tmp_out);
CleanupStack::PushL(bn_xj);
// Calculate bn_xkey = (XKEY + 1 + xj) mod 2^b
bn_xkey += 1;
bn_xkey += bn_xj;
bn_xkey %= bn_mod;
// New tmp_xkey
tmp_xkey.Copy(bn_xkey.BufferLC()->Des());
CleanupStack::PopAndDestroy(); // bn_xkey buffer
CleanupStack::PopAndDestroy(&bn_xj);
EAP_TRACE_DEBUG(
m_am_tools,
TRACE_FLAGS_EAP_AM_CRYPTO,
(EAPL("dss_pseudo_random(): xkey[%d] = (1 + xkey[%d] + x[%d]) % mod\n"),
ind+1u,
ind,
ind));
EAP_TRACE_FORMAT(
m_am_tools,
(debug_buffer,
sizeof(debug_buffer),
EAPL("xkey[%d]"),
ind+1u));
EAP_TRACE_DATA_DEBUG(
m_am_tools,
TRACE_FLAGS_EAP_AM_CRYPTO,
((eap_format_string)debug_buffer,
tmp_xkey.Ptr(),
tmp_xkey.Length()));
} // for()
CleanupStack::PopAndDestroy(&bn_mod);
CleanupStack::PopAndDestroy(&bn_xkey);
}
// End.