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Multiplication in GF(128) is required by the AES-XEX mode for computing X in the XEX formula from https://en.wikipedia.org/wiki/Disk_encryption_theory#Xor-encrypt-xor_.28XEX.29
46 lines
1.2 KiB
C
46 lines
1.2 KiB
C
/**
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* \file gf128mul.h
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*
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* \brief Fast multiplication in GF(128)
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*
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* Copyright (C) 2006-2015, 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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#ifndef MBEDTLS_GF128MUL_H
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#define MBEDTLS_GF128MUL_H
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#ifdef __cplusplus
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extern "C" {
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#endif
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/**
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* \brief Big-Endian definition for 128 bits elements
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*/
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typedef unsigned char be128[16];
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/**
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* \brief Multiplication in GF(128):
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* r = x times x^4 times x^8 in GF(2^128)
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*
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* \param x the 128-bits number you want to multiply
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* \param r result
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*/
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void gf128mul_x_ble(be128 r, const be128 x);
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#endif /* gf128mul.h */ |