mirror of
https://github.com/yuzu-emu/mbedtls.git
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9df2b416b9
Add a new CRC module along with some tests for it. The table and the CRC function body is generated using pycrc v0.9.2. Signed-off-by: Andrzej Kurek <andrzej.kurek@arm.com>
56 lines
1.7 KiB
C
56 lines
1.7 KiB
C
/*
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* CRC-16/ARC implementation, generated using pycrc v0.9.2, https://pycrc.org,
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* with further FI countermeasures added manually.
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*
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* Used options: --model=crc-16 --algorithm=tbl --generate=c --std=C89 --table-idx-width 4
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*
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* Copyright (C) 2006-2020, ARM Limited, All Rights Reserved
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* SPDX-License-Identifier: Apache-2.0
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*
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* Licensed under the Apache License, Version 2.0 (the "License"); you may
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* not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*
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* This file is part of mbed TLS (https://tls.mbed.org)
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*/
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#if !defined(MBEDTLS_CONFIG_FILE)
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#include "mbedtls/config.h"
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#else
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#include MBEDTLS_CONFIG_FILE
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#endif
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#if defined(MBEDTLS_CRC_C)
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#include "mbedtls/crc.h"
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static const uint32_t crc_table[16] = {
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0x0000, 0xcc01, 0xd801, 0x1400, 0xf001, 0x3c00, 0x2800, 0xe401,
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0xa001, 0x6c00, 0x7800, 0xb401, 0x5000, 0x9c01, 0x8801, 0x4400
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};
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uint16_t mbedtls_crc_update( uint16_t crc, const void *data, size_t data_len )
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{
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const unsigned char *d = (const unsigned char *)data;
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unsigned int tbl_idx;
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while ( data_len -- ) {
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tbl_idx = crc ^ *d;
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crc = crc_table[tbl_idx & 0x0f] ^ ( crc >> 4 );
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tbl_idx = crc ^ ( *d >> 4 );
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crc = crc_table[tbl_idx & 0x0f] ^ ( crc >> 4 );
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d ++;
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}
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return crc;
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}
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#endif /* MBEDTLS_CRC_C */
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