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| file_encryption_decrypt_script 2018-07-05 | file_encryption_decrypt_script 2024-01-02 (current) | ||
| Line 2: | Line 2: | ||
| The following PowerShell script can be used to decrypt files [[file_encryption|encrypted by WinSCP]], when you do not have WinSCP available. | The following PowerShell script can be used to decrypt files [[file_encryption|encrypted by WinSCP]], when you do not have WinSCP available. | ||
| + | |||
| + | //The script works both in legacy Windows PowerShell and modern PowerShell [Core], though it runs slower in the latter.// | ||
| + | |||
| + | //For C# version of the ''AesCtrTransform'' function, see [[https://stackoverflow.com/q/6374437/850848#51188472|Can I use AES in CTR mode in .NET?]]// | ||
| <code powershell> | <code powershell> | ||
| Line 22: | Line 26: | ||
| $counter = $salt.Clone() | $counter = $salt.Clone() | ||
| - | $xorMask = New-Object System.Collections.Queue<byte> | + | # Particularly in pwsh, it runs much faster with non-generic Queue |
| + | ····$xorMask = New-Object System.Collections.Queue | ||
| $zeroIv = New-Object byte[] $blockSize | $zeroIv = New-Object byte[] $blockSize | ||
| Line 64: | Line 69: | ||
| $aes = New-Object System.Security.Cryptography.AesManaged | $aes = New-Object System.Security.Cryptography.AesManaged | ||
| - | $key = [System.Runtime.Remoting.Metadata.W3cXsd2001.SoapHexBinary]::Parse($key).Value | + | try |
| + | { | ||
| + | # .NET >= 5 | ||
| + | $key = [System.Convert]::FromHexString($key) | ||
| + | } | ||
| + | catch [System.Management.Automation.RuntimeException] | ||
| + | { | ||
| + | # .NET Framework | ||
| + | ········$key = [System.Runtime.Remoting.Metadata.W3cXsd2001.SoapHexBinary]::Parse($key).Value | ||
| + | } | ||
| $keySize = $aes.KeySize / 8 | $keySize = $aes.KeySize / 8 | ||
| if ($key.Length -ne $keySize) | if ($key.Length -ne $keySize) | ||
| Line 76: | Line 90: | ||
| if (-not ($name -like "*$aesCtrExt")) | if (-not ($name -like "*$aesCtrExt")) | ||
| { | { | ||
| - | throw "$name has not a know encrypted file extension [$aesCtrExt]" | + | throw "$name has not a known encrypted file extension [$aesCtrExt]" |
| } | } | ||
| Line 83: | Line 97: | ||
| if (($padding -gt 0) -and ($padding -lt 4)) | if (($padding -gt 0) -and ($padding -lt 4)) | ||
| { | { | ||
| - | $base64 = "=" * $padding | + | $base64 += "=" * $padding |
| } | } | ||
| Line 158: | Line 172: | ||
| } | } | ||
| </code> | </code> | ||
| + | |||