mirror of https://github.com/acidanthera/audk.git
108 lines
2.6 KiB
C
108 lines
2.6 KiB
C
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/** @file
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Encode realted functions from Xkcp.
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Copyright (c) 2022, Intel Corporation. All rights reserved.<BR>
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SPDX-License-Identifier: BSD-2-Clause-Patent
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Copyright 2022 The eXtended Keccak Code Package (XKCP)
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https://github.com/XKCP/XKCP
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Keccak, designed by Guido Bertoni, Joan Daemen, Michael Peeters and Gilles Van Assche.
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Implementation by the designers, hereby denoted as "the implementer".
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For more information, feedback or questions, please refer to the Keccak Team website:
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https://keccak.team/
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To the extent possible under law, the implementer has waived all copyright
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and related or neighboring rights to the source code in this file.
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http://creativecommons.org/publicdomain/zero/1.0/
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**/
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#include "CryptParallelHash.h"
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/**
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Encode function from XKCP.
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Encodes the input as a byte string in a way that can be unambiguously parsed
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from the beginning of the string by inserting the length of the byte string
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before the byte string representation of input.
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@param[out] EncBuf Result of left encode.
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@param[in] Value Input of left encode.
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@retval EncLen Size of encode result in bytes.
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**/
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UINTN
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EFIAPI
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LeftEncode (
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OUT UINT8 *EncBuf,
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IN UINTN Value
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)
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{
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UINT32 BlockNum;
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UINT32 EncLen;
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UINT32 Index;
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UINTN ValueCopy;
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for ( ValueCopy = Value, BlockNum = 0; ValueCopy && (BlockNum < sizeof (UINTN)); ++BlockNum, ValueCopy >>= 8 ) {
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//
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// Empty
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//
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}
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if (BlockNum == 0) {
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BlockNum = 1;
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}
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for (Index = 1; Index <= BlockNum; ++Index) {
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EncBuf[Index] = (UINT8)(Value >> (8 * (BlockNum - Index)));
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}
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EncBuf[0] = (UINT8)BlockNum;
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EncLen = BlockNum + 1;
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return EncLen;
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}
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/**
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Encode function from XKCP.
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Encodes the input as a byte string in a way that can be unambiguously parsed
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from the end of the string by inserting the length of the byte string after
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the byte string representation of input.
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@param[out] EncBuf Result of right encode.
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@param[in] Value Input of right encode.
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@retval EncLen Size of encode result in bytes.
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**/
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UINTN
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EFIAPI
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RightEncode (
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OUT UINT8 *EncBuf,
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IN UINTN Value
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)
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{
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UINT32 BlockNum;
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UINT32 EncLen;
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UINT32 Index;
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UINTN ValueCopy;
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for (ValueCopy = Value, BlockNum = 0; ValueCopy && (BlockNum < sizeof (UINTN)); ++BlockNum, ValueCopy >>= 8) {
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//
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// Empty
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//
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}
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if (BlockNum == 0) {
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BlockNum = 1;
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}
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for (Index = 1; Index <= BlockNum; ++Index) {
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EncBuf[Index-1] = (UINT8)(Value >> (8 * (BlockNum-Index)));
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}
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EncBuf[BlockNum] = (UINT8)BlockNum;
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EncLen = BlockNum + 1;
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return EncLen;
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}
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