eapol/eapol_framework/eapol_common/am/common/crypto/sha-256/eap_am_crypto_sha_256.cpp
/*
* 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: 14 %
*/
// This is enumeration of EAPOL source code.
#if defined(USE_EAP_MINIMUM_RELEASE_TRACES)
#undef EAP_FILE_NUMBER_ENUM
#define EAP_FILE_NUMBER_ENUM 578
#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 "eap_am_crypto_sha_256.h"
//--------------------------------------------------
#if 0
#define EAP_SHA_256_TRACE_DEBUG EAP_TRACE_DEBUG
#define EAP_SHA_256_TRACE_DATA_DEBUG EAP_TRACE_DATA_DEBUG
#else
#define EAP_SHA_256_TRACE_DEBUG(tools, flags, params)
#define EAP_SHA_256_TRACE_DATA_DEBUG(object_name, flags, _parameter_list_)
#endif
#if defined(USE_EAP_TRACE)
static const u32_t EAP_TRACE_MASK_SHA_256 = TRACE_FLAGS_DEFAULT;
#endif //#if defined(USE_EAP_TRACE)
const unsigned long eap_am_crypto_sha_256_c::m_K[eap_am_crypto_sha_256_c::EAP_AM_CRYPTO_SHA_256_SCHEDULE_u32_COUNT] =
{
0x428a2f98, 0x71374491, 0xb5c0fbcf, 0xe9b5dba5, 0x3956c25b, 0x59f111f1, 0x923f82a4, 0xab1c5ed5,
0xd807aa98, 0x12835b01, 0x243185be, 0x550c7dc3, 0x72be5d74, 0x80deb1fe, 0x9bdc06a7, 0xc19bf174,
0xe49b69c1, 0xefbe4786, 0x0fc19dc6, 0x240ca1cc, 0x2de92c6f, 0x4a7484aa, 0x5cb0a9dc, 0x76f988da,
0x983e5152, 0xa831c66d, 0xb00327c8, 0xbf597fc7, 0xc6e00bf3, 0xd5a79147, 0x06ca6351, 0x14292967,
0x27b70a85, 0x2e1b2138, 0x4d2c6dfc, 0x53380d13, 0x650a7354, 0x766a0abb, 0x81c2c92e, 0x92722c85,
0xa2bfe8a1, 0xa81a664b, 0xc24b8b70, 0xc76c51a3, 0xd192e819, 0xd6990624, 0xf40e3585, 0x106aa070,
0x19a4c116, 0x1e376c08, 0x2748774c, 0x34b0bcb5, 0x391c0cb3, 0x4ed8aa4a, 0x5b9cca4f, 0x682e6ff3,
0x748f82ee, 0x78a5636f, 0x84c87814, 0x8cc70208, 0x90befffa, 0xa4506ceb, 0xbef9a3f7, 0xc67178f2
};
//--------------------------------------------------
EAP_FUNC_EXPORT eap_am_crypto_sha_256_c::~eap_am_crypto_sha_256_c()
{
hash_cleanup();
}
//--------------------------------------------------
EAP_FUNC_EXPORT eap_am_crypto_sha_256_c::eap_am_crypto_sha_256_c(
abs_eap_am_tools_c * const tools)
: m_am_tools(tools)
, m_saved_data(tools)
, m_full_hashed_data_length(0ul)
, m_is_valid(false)
{
m_H[0] = 0;
m_T[0] = 0;
m_M_in_host_order[0] = 0;
if (m_saved_data.get_is_valid() == false)
{
#if defined(USE_EAP_TRACE)
EAP_UNREFERENCED_PARAMETER(EAP_TRACE_MASK_SHA_256);
#endif //#if defined(USE_EAP_TRACE)
return;
}
eap_status_e status = hash_init();
if (status != eap_status_ok)
{
return;
}
set_is_valid();
}
//------------------------------------------------------------
/**
* The set_is_invalid() function sets the state of the eap_am_crypto_sha_256_c
* object invalid.
* The eap_am_crypto_sha_256_c object calls this function after it is initialized.
*/
EAP_FUNC_EXPORT void eap_am_crypto_sha_256_c::set_is_invalid()
{
m_is_valid = false;
}
//------------------------------------------------------------
/**
* The set_is_valid() function sets the state of the eap_am_crypto_sha_256_c
* object valid.
* The eap_am_crypto_sha_256_c object calls this function after it is initialized.
*/
EAP_FUNC_EXPORT void eap_am_crypto_sha_256_c::set_is_valid()
{
m_is_valid = true;
}
//------------------------------------------------------------
/**
* The get_is_valid() function returns the status of the eap_am_crypto_sha_256_c
* object.
* True indicates the object is allocated successfully.
*/
EAP_FUNC_EXPORT bool eap_am_crypto_sha_256_c::get_is_valid()
{
return m_is_valid;
}
//--------------------------------------------------
inline u32_t eap_am_crypto_sha_256_c::eap_sha_256_rotate(
const u32_t value,
const u32_t shift
)
{
return (value >> shift) | (value << (32ul - shift));
}
//--------------------------------------------------
EAP_FUNC_EXPORT eap_status_e
eap_am_crypto_sha_256_c::eap_sha_256_process_data_host_order(
const u32_t * M,
u32_t M_count
)
{
u32_t A;
u32_t B;
u32_t C;
u32_t D;
u32_t E;
u32_t F;
u32_t G;
u32_t H;
u32_t S0;
u32_t S1;
u32_t T1;
u32_t T2;
u32_t W[EAP_AM_CRYPTO_SHA_256_SCHEDULE_u32_COUNT];
if (M == 0
|| M_count == 0
|| (M_count % EAP_AM_CRYPTO_SHA_256_BLOCK_u32_COUNT) != 0)
{
EAP_ASSERT_ANYWAY;
EAP_SYSTEM_DEBUG_BREAK();
return EAP_STATUS_RETURN(m_am_tools, eap_status_illegal_parameter);
}
do
{
m_am_tools->memmove(W, M, sizeof(u32_t) * EAP_AM_CRYPTO_SHA_256_BLOCK_u32_COUNT); // Initialize 16 W words.
{
// Extend 16 W words to 64 W words.
for (u32_t ind = EAP_AM_CRYPTO_SHA_256_BLOCK_u32_COUNT; ind != EAP_AM_CRYPTO_SHA_256_SCHEDULE_u32_COUNT; ind++)
{
S0 = eap_sha_256_rotate(W[ind-15], 7) ^ eap_sha_256_rotate(W[ind-15], 18) ^ (W[ind-15] >> 3);
S1 = eap_sha_256_rotate(W[ind-2], 17) ^ eap_sha_256_rotate(W[ind-2], 19) ^ (W[ind-2] >> 10);
W[ind] = W[ind-16] + S0 + W[ind-7] + S1;
}
}
#if defined(_DEBUG)
{
for (u32_t ind = 0ul; ind != M_count; ind++)
{
EAP_SHA_256_TRACE_DEBUG(m_am_tools, EAP_TRACE_MASK_SHA_256,
(EAPL("SHA_256: M[%d]=%08x, W[%d]=%08x\n"),
ind,
M[ind],
ind,
W[ind]));
} // for()
EAP_SHA_256_TRACE_DEBUG(m_am_tools, EAP_TRACE_MASK_SHA_256,
(EAPL("SHA_256: H[0]=0x%08x, H[1]=0x%08x, H[2]=0x%08x, H[3]=0x%08x, H[4]=0x%08x, H[5]=0x%08x, H[6]=0x%08x, H[7]=0x%08x\n"),
m_H[0],
m_H[1],
m_H[2],
m_H[3],
m_H[4],
m_H[5],
m_H[6],
m_H[7]));
EAP_SHA_256_TRACE_DEBUG(m_am_tools, EAP_TRACE_MASK_SHA_256,
(EAPL("SHA_256:\t% 4s\t% 8s\t% 8s\t% 8s\t% 8s\t% 8s\t% 8s\t% 8s\t% 8s\t% 8s\t% 8s\t% 8s\t% 8s\n"),
"t", "A", "B", "C", "D", "E", "F", "G", "H", "T1", "T2", "S0", "S1"));
}
#endif //#if defined(_DEBUG)
A = m_H[0];
B = m_H[1];
C = m_H[2];
D = m_H[3];
E = m_H[4];
F = m_H[5];
G = m_H[6];
H = m_H[7];
{
for(u32_t ind = 0; ind != EAP_AM_CRYPTO_SHA_256_SCHEDULE_u32_COUNT; ind++)
{
S0 = eap_sha_256_rotate(A, 2) ^ eap_sha_256_rotate(A, 13) ^ eap_sha_256_rotate(A, 22);
T2 = S0 + ((A & B) ^ (A & C) ^ (B & C));
S1 = eap_sha_256_rotate(E, 6) ^ eap_sha_256_rotate(E, 11) ^ eap_sha_256_rotate(E, 25);
T1 = H + S1 + ((E & F) ^ ((~E) & G)) + m_K[ind] + W[ind];
H = G;
G = F;
F = E;
E = D + T1;
D = C;
C = B;
B = A;
A = T1 + T2;
EAP_SHA_256_TRACE_DEBUG(
m_am_tools,
EAP_TRACE_MASK_SHA_256,
(EAPL("SHA_256:\tt=%d\t%08x\t%08x\t%08x\t%08x\t%08x\t%08x\t%08x\t%08x\t%08x\t%08x\t%08x\t%08x\n"),
ind, A, B, C, D, E, F, G, H, T1, T2, S0, S1));
}
}
m_H[0] = m_H[0] + A;
m_H[1] = m_H[1] + B;
m_H[2] = m_H[2] + C;
m_H[3] = m_H[3] + D;
m_H[4] = m_H[4] + E;
m_H[5] = m_H[5] + F;
m_H[6] = m_H[6] + G;
m_H[7] = m_H[7] + H;
M_count -= EAP_AM_CRYPTO_SHA_256_BLOCK_u32_COUNT;
M += EAP_AM_CRYPTO_SHA_256_BLOCK_u32_COUNT;
} while(M_count > 0ul);
EAP_SHA_256_TRACE_DEBUG(m_am_tools, EAP_TRACE_MASK_SHA_256,
(EAPL("SHA_256: digest=%08x %08x %08x %08x %08x %08x %08x %08x\n"),
m_H[0], m_H[1], m_H[2], m_H[3], m_H[4], m_H[5], m_H[6], m_H[7]));
return EAP_STATUS_RETURN(m_am_tools, eap_status_ok);
}
//--------------------------------------------------
EAP_FUNC_EXPORT eap_status_e
eap_am_crypto_sha_256_c::eap_sha_256_process_data_network_order(
const u32_t * M,
u32_t M_count
)
{
if (M == 0
//|| (reinterpret_cast<u32_t>(M) % sizeof(u32_t)) != 0
|| M_count == 0
|| (M_count % EAP_AM_CRYPTO_SHA_256_BLOCK_u32_COUNT) != 0)
{
EAP_ASSERT_ANYWAY;
EAP_SYSTEM_DEBUG_BREAK();
return EAP_STATUS_RETURN(m_am_tools, eap_status_illegal_parameter);
}
eap_status_e status = eap_status_ok;
// Array of 16 temporary 32-bit unsigned integers.
u32_t count = M_count / EAP_AM_CRYPTO_SHA_256_BLOCK_u32_COUNT;
for (u32_t ind = 0ul; ind != count; ind++)
{
for (u32_t ind_M = 0ul; ind_M != EAP_AM_CRYPTO_SHA_256_BLOCK_u32_COUNT
; ind_M++)
{
// Here we must read data in 8-bit blocks bacause M can be aligned at any position.
const u8_t * const data
= reinterpret_cast<const u8_t *>(
&M[ind*EAP_AM_CRYPTO_SHA_256_BLOCK_u32_COUNT+ind_M]);
m_M_in_host_order[ind_M]
= (data[0] << 24)
| (data[1] << 16)
| (data[2] << 8)
| (data[3] << 0);
} // for()
status = eap_sha_256_process_data_host_order(
m_M_in_host_order,
EAP_AM_CRYPTO_SHA_256_BLOCK_u32_COUNT);
if (status != eap_status_ok)
{
return EAP_STATUS_RETURN(m_am_tools, status);
}
} // for()
return EAP_STATUS_RETURN(m_am_tools, status);
}
//--------------------------------------------------
EAP_FUNC_EXPORT eap_status_e eap_am_crypto_sha_256_c::copy_message_digest(
void * const output,
u32_t * const max_output_size)
{
if (output == 0
|| max_output_size == 0
|| *max_output_size < EAP_AM_CRYPTO_SHA_256_DIGEST_BUFFER_BYTE_SIZE)
{
return EAP_STATUS_RETURN(m_am_tools, eap_status_illegal_parameter);
}
#if defined(EAP_LITTLE_ENDIAN)
// We must change the data from host order to network order.
u32_t * const tmp_H = static_cast<u32_t *>(output);
for (u32_t ind = 0ul; ind != EAP_AM_CRYPTO_SHA_256_DIGEST_BUFFER_u32_COUNT
; ind++)
{
tmp_H[ind] = eap_htonl(m_H[ind]);
} // for()
#elif defined(EAP_BIG_ENDIAN)
m_am_tools->memmove(
output,
m_H,
EAP_AM_CRYPTO_SHA_256_DIGEST_BUFFER_BYTE_SIZE);
#else
#error ERROR: define EAP_LITTLE_ENDIAN (byte 0 is least significant (i386)) \
or EAP_BIG_ENDIAN (byte 0 is most significant (mc68k)).
#endif
*max_output_size = EAP_AM_CRYPTO_SHA_256_DIGEST_BUFFER_BYTE_SIZE;
return EAP_STATUS_RETURN(m_am_tools, eap_status_ok);
}
//--------------------------------------------------
/**
* This function returns the size of message digest of HASH-algorithm.
*/
EAP_FUNC_EXPORT u32_t eap_am_crypto_sha_256_c::get_digest_length()
{
return EAP_AM_CRYPTO_SHA_256_DIGEST_BUFFER_BYTE_SIZE;
}
//--------------------------------------------------
/**
* This function returns the size of block of HASH-algorithm.
*/
EAP_FUNC_EXPORT u32_t eap_am_crypto_sha_256_c::get_block_size()
{
return EAP_AM_CRYPTO_SHA_256_BLOCK_BYTE_SIZE;
}
//--------------------------------------------------
/**
* This function initializes the context of SHA_256-algorithm.
*/
EAP_FUNC_EXPORT eap_status_e eap_am_crypto_sha_256_c::hash_init()
{
m_full_hashed_data_length = 0ul;
m_H[0] = static_cast<u32_t>(EAP_SHA_256_INIT_H0);
m_H[1] = static_cast<u32_t>(EAP_SHA_256_INIT_H1);
m_H[2] = static_cast<u32_t>(EAP_SHA_256_INIT_H2);
m_H[3] = static_cast<u32_t>(EAP_SHA_256_INIT_H3);
m_H[4] = static_cast<u32_t>(EAP_SHA_256_INIT_H4);
m_H[5] = static_cast<u32_t>(EAP_SHA_256_INIT_H5);
m_H[6] = static_cast<u32_t>(EAP_SHA_256_INIT_H6);
m_H[7] = static_cast<u32_t>(EAP_SHA_256_INIT_H7);
if (m_saved_data.get_is_valid() == false)
{
return EAP_STATUS_RETURN(m_am_tools, eap_status_allocation_error);
}
eap_status_e status = m_saved_data.set_data_length(0ul);
return EAP_STATUS_RETURN(m_am_tools, status);
}
//--------------------------------------------------
/**
* This function updates the context of SHA_256-algorithm with data.
*/
EAP_FUNC_EXPORT eap_status_e eap_am_crypto_sha_256_c::hash_update(
const void * const data,
const u32_t data_length)
{
eap_status_e status = eap_status_ok;
u32_t prosessed_data_length = 0ul;
m_full_hashed_data_length += data_length;
EAP_SHA_256_TRACE_DEBUG(m_am_tools, EAP_TRACE_MASK_SHA_256,
(EAPL("SHA_256: Processed data length %u\n"),
m_full_hashed_data_length));
if (m_saved_data.get_is_valid_data() == true
&& m_saved_data.get_data_length() > 0ul)
{
EAP_SHA_256_TRACE_DATA_DEBUG(
m_am_tools,
EAP_TRACE_MASK_SHA_256,
(EAPL("SHA_256 saved data"),
m_saved_data.get_data(m_saved_data.get_data_length()),
m_saved_data.get_data_length()));
// Here we have remaining data to process from previous call
// of hash_update().
u32_t needed_data_length = EAP_AM_CRYPTO_SHA_256_BLOCK_BYTE_SIZE
- m_saved_data.get_data_length();
if (needed_data_length > data_length)
{
// Not enough input data.
needed_data_length = data_length;
}
prosessed_data_length = needed_data_length;
status = m_saved_data.add_data(data, needed_data_length);
if (status != eap_status_ok)
{
return EAP_STATUS_RETURN(m_am_tools, status);
}
if (m_saved_data.get_data_length()
== EAP_AM_CRYPTO_SHA_256_BLOCK_BYTE_SIZE)
{
// Enough data to process.
// Just one block of integers in W array.
status = eap_sha_256_process_data_network_order(
reinterpret_cast<const u32_t *>(
m_saved_data.get_data(
m_saved_data.get_data_length())),
EAP_AM_CRYPTO_SHA_256_BLOCK_u32_COUNT
);
if (status != eap_status_ok)
{
return EAP_STATUS_RETURN(m_am_tools, status);
}
// This is optimization of buffer allocations.
status = m_saved_data.set_data_length(0ul);
if (status != eap_status_ok)
{
return EAP_STATUS_RETURN(m_am_tools, status);
}
}
EAP_ASSERT(m_saved_data.get_is_valid_data() == false
|| m_saved_data.get_data_length()
<= EAP_AM_CRYPTO_SHA_256_BLOCK_BYTE_SIZE);
}
u32_t remaining_data_length = data_length - prosessed_data_length;
u32_t full_block_count = remaining_data_length
/ EAP_AM_CRYPTO_SHA_256_BLOCK_BYTE_SIZE;
if (full_block_count > 0ul)
{
// Here we have full blocks to process.
status = eap_sha_256_process_data_network_order(
reinterpret_cast<const u32_t *>(
static_cast<const u8_t *>(data)+prosessed_data_length),
full_block_count * EAP_AM_CRYPTO_SHA_256_BLOCK_u32_COUNT
);
if (status != eap_status_ok)
{
return EAP_STATUS_RETURN(m_am_tools, status);
}
prosessed_data_length += sizeof(u32_t) * full_block_count
* EAP_AM_CRYPTO_SHA_256_BLOCK_u32_COUNT;
}
if (data_length > prosessed_data_length)
{
// Save the remaining data.
status = m_saved_data.add_data(
static_cast<const u8_t *>(data)+prosessed_data_length,
data_length-prosessed_data_length);
if (status != eap_status_ok)
{
return EAP_STATUS_RETURN(m_am_tools, status);
}
}
return EAP_STATUS_RETURN(m_am_tools, status);
}
//--------------------------------------------------
/**
* This function writes the message digest to buffer.
* @param Length is set if md_length_or_null is non-NULL.
*/
EAP_FUNC_EXPORT eap_status_e eap_am_crypto_sha_256_c::hash_final(
void * const message_digest,
u32_t *md_length_or_null)
{
eap_status_e status = eap_status_ok;
if (message_digest == 0)
{
return EAP_STATUS_RETURN(m_am_tools, eap_status_illegal_parameter);
}
if (m_saved_data.get_is_valid_data() == true)
{
EAP_SHA_256_TRACE_DATA_DEBUG(
m_am_tools,
EAP_TRACE_MASK_SHA_256,
(EAPL("SHA_256 saved data"),
m_saved_data.get_data(m_saved_data.get_data_length()),
m_saved_data.get_data_length()));
}
// First add the one bit. We use one byte 0x80.
u8_t bit_pad = 0x80;
status = m_saved_data.add_data(&bit_pad, sizeof(bit_pad));
if (status != eap_status_ok)
{
return EAP_STATUS_RETURN(m_am_tools, status);
}
// Here we may have remaining data to process from previous call
// of hash_update().
u32_t min_data_length = m_saved_data.get_data_length() + sizeof(u64_t);
u32_t padding_zero_count = 0ul;
u32_t block_count = min_data_length / EAP_AM_CRYPTO_SHA_256_BLOCK_BYTE_SIZE;
if ((min_data_length % EAP_AM_CRYPTO_SHA_256_BLOCK_BYTE_SIZE) != 0)
{
// Last block is not full.
++block_count;
}
padding_zero_count = (block_count*EAP_AM_CRYPTO_SHA_256_BLOCK_BYTE_SIZE)
- min_data_length;
// Now we need to pad the remaining data.
u32_t data_length = m_saved_data.get_data_length();
status = m_saved_data.set_buffer_length(data_length+padding_zero_count);
if (status != eap_status_ok)
{
return EAP_STATUS_RETURN(m_am_tools, status);
}
m_saved_data.set_data_length(data_length+padding_zero_count);
u8_t * const padding = m_saved_data.get_data_offset(data_length, padding_zero_count);
if (padding == 0)
{
return EAP_STATUS_RETURN(m_am_tools, eap_status_buffer_too_short);
}
m_am_tools->memset(
padding,
0,
padding_zero_count);
// And finally the length of the hashed data is added to block.
// Note the length is in bits.
u64_t full_hashed_data_length_in_network_order
= eap_htonll(eap_shift_left_64_bit(m_full_hashed_data_length, 3ul));
status = m_saved_data.add_data(
&full_hashed_data_length_in_network_order,
sizeof(full_hashed_data_length_in_network_order));
if (status != eap_status_ok)
{
return EAP_STATUS_RETURN(m_am_tools, status);
}
EAP_ASSERT(m_saved_data.get_data_length()
>= EAP_AM_CRYPTO_SHA_256_BLOCK_BYTE_SIZE
&& (m_saved_data.get_data_length()
% EAP_AM_CRYPTO_SHA_256_BLOCK_BYTE_SIZE) == 0);
u32_t full_block_count = m_saved_data.get_data_length()
/ EAP_AM_CRYPTO_SHA_256_BLOCK_BYTE_SIZE;
status = eap_sha_256_process_data_network_order(
reinterpret_cast<const u32_t *>(
m_saved_data.get_data(
m_saved_data.get_data_length())),
full_block_count * EAP_AM_CRYPTO_SHA_256_BLOCK_u32_COUNT
);
if (status != eap_status_ok)
{
return EAP_STATUS_RETURN(m_am_tools, status);
}
// This is optimization of buffer allocations.
status = m_saved_data.set_data_length(0ul);
if (status != eap_status_ok)
{
return EAP_STATUS_RETURN(m_am_tools, status);
}
u32_t output_length = 0ul;
if (md_length_or_null == 0)
{
// Let's use temporary length variable.
output_length = EAP_AM_CRYPTO_SHA_256_DIGEST_BUFFER_BYTE_SIZE;
md_length_or_null = &output_length;
}
status = copy_message_digest(
message_digest,
md_length_or_null);
if (status != eap_status_ok)
{
return EAP_STATUS_RETURN(m_am_tools, status);
}
return EAP_STATUS_RETURN(m_am_tools, eap_status_ok);
}
//--------------------------------------------------
/**
* This function cleans up the SHA_256 context.
*/
EAP_FUNC_EXPORT eap_status_e eap_am_crypto_sha_256_c::hash_cleanup()
{
m_saved_data.reset();
m_full_hashed_data_length = 0ul;
m_am_tools->memset(m_H, 0, EAP_AM_CRYPTO_SHA_256_DIGEST_BUFFER_BYTE_SIZE);
return EAP_STATUS_RETURN(m_am_tools, eap_status_ok);
}
//--------------------------------------------------
/**
* This function copies the context of SHA_256.
*/
EAP_FUNC_EXPORT eap_status_e eap_am_crypto_sha_256_c::copy_context(
const eap_variable_data_c * const saved_data,
const u64_t full_hashed_data_length,
const u32_t * const H,
const u32_t * const T,
const u32_t * const W_in_host_order)
{
if (saved_data->get_is_valid_data() == true)
{
eap_status_e status = m_saved_data.set_copy_of_buffer(saved_data);
if (status != eap_status_ok)
{
return EAP_STATUS_RETURN(m_am_tools, status);
}
}
else
{
// No saved data. Just reset.
m_saved_data.reset();
}
m_full_hashed_data_length = full_hashed_data_length;
m_am_tools->memmove(m_H, H, sizeof(m_H));
m_am_tools->memmove(m_T, T, sizeof(m_T));
m_am_tools->memmove(m_M_in_host_order, W_in_host_order, sizeof(m_M_in_host_order));
return EAP_STATUS_RETURN(m_am_tools, eap_status_ok);
}
//--------------------------------------------------
/**
* This function copies the context of SHA_256.
*/
EAP_FUNC_EXPORT eap_am_crypto_sha_256_c * eap_am_crypto_sha_256_c::copy()
{
eap_am_crypto_sha_256_c * const sha_256 = new eap_am_crypto_sha_256_c(m_am_tools);
if (sha_256 == 0
|| sha_256->get_is_valid() == false)
{
delete sha_256;
return 0;
}
eap_status_e status = sha_256->copy_context(
&m_saved_data,
m_full_hashed_data_length,
m_H,
m_T,
m_M_in_host_order);
if (status != eap_status_ok)
{
delete sha_256;
return 0;
}
return sha_256;
}
//--------------------------------------------------
// End.