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November 18, 2020 06:04
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PowerShell CRC-16 Script
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Function Get-CRC16 { | |
[CmdletBinding()] | |
Param ( | |
[Parameter(Mandatory=$true, ValueFromPipeline=$true)] | |
[string]$String, | |
[Parameter(Mandatory=$false, ValueFromPipeline=$true)] | |
$CRCValue # For future verification | |
) | |
$CRC = 0xFFFF # Set to 0x0000 for CRC-16/XMODEM, ACORN, LTE output | |
$Poly = 0x1021 | |
$ReflectD = $False # Not used but for reference | |
$ReflCRCO = $False # Not used but for reference | |
$XOR = 0x0000 # Not used but for reference | |
$Check = 0x29B1 # Not used but for reference | |
For ($i=0;$i -lt $String.Length;$i++) { | |
$CH = '0x' + "{0:x}" -f [int][char]$String[$i] -shl 8 | |
For ($j=0;$j -lt 8;$j++) { | |
If (($CRC -bxor $CH) -band 0x8000) { $xor_flag = $True } Else { $xor_flag = $False } | |
$CRC = $CRC -shl 1 | |
If ($xor_flag -eq $True) { $CRC = $CRC -bxor $Poly } | |
$CH = $CH -shl 1 | |
} | |
} | |
return '0x' + '{0:X2}' -f ($CRC -band 0xFFFF) | |
} |
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