(gci "./test files/Example1.docx" | % {[System.IO.File]::ReadAllBytes($_)}) -as [byte[]] | sv -Name "DataFileRawBytes"
(gci "./test files/Example1.docx.sign" | % {[System.IO.File]::ReadAllBytes($_)}) -as [byte[]] | sv -Name "SignatureFileRawBytes"
$signedContent = [Org.BouncyCastle.Cms.CmsProcessableByteArray]::new($DataFileRawBytes)
[Org.BouncyCastle.Cms.CmsSignedData] $signedData = [Org.BouncyCastle.Cms.CmsSignedData]::new($signedContent, $SignatureFileRawBytes)
$certStoreInSig = $signedData.GetCertificates("collection") #Получаем сертификаты
$signers = $signedData.GetSignerInfos().GetSigners()
0..($signers.Count-1) | % {
    $cert = $certStoreInSig.GetMatches($signers[$_].SignerID)
    $signers[$_].verify($cert[0]) #Проверяем подпись
} | % {if ($_ -eq $true) {
        Write-Host "Signature Verified!" -ForegroundColor Green
    }
    elseif ($_ -eq $false) {
        Write-Host "Signature NOT Verified!" -ForegroundColor Red
    }
}

$encodedAttrbFilePath = (pwd).ToString() + "\test files\encodedattrb.txt"
$encodedAttrb = $signers[0].GetEncodedSignedAttributes()
Test-Path -Path $encodedAttrbFilePath | % {if ($_ -eq $false) {ni -i File -p $encodedAttrbFilePath}; if ($_ -eq $true) {gci $encodedAttrbFilePath | sc -Value $null}}
[System.IO.File]::WriteAllBytes($encodedAttrbFilePath,$encodedAttrb)

$encodedAttrbSignatureFilePath = (pwd).ToString() + "\test files\encodedattrb.sign"
$encodedAttrbSignature = $signers[0].getSignature()
Test-Path -Path $encodedAttrbSignatureFilePath | % {if ($_ -eq $false) {ni -i File -p $encodedAttrbSignatureFilePath}; if ($_ -eq $true) {gci $encodedAttrbSignatureFilePath | sc -Value $null}}
[array]::Reverse($encodedAttrbSignature) #Разворачиваем массив подписи
[System.IO.File]::WriteAllBytes($encodedAttrbSignatureFilePath,$encodedAttrbSignature)
& "C:\Program Files (x86)\Crypto Pro\CSP\csptest.exe" -keyset -verify GOST12_256 -in $encodedAttrbFilePath -signature $encodedAttrbSignatureFilePath -cert (gci ".\test files\1.cer") #Получаем Signature Verified OK (УРААА!!!!)

[byte[]]$encodedAttrbHash = [CryptoPro.Sharpei.Gost3411_2012_256]::Create().ComputeHash($encodedAttrb)
$certi = gi Cert:\CurrentUser\My\E3005A57425DFFB920DB2953050D83E89F08008D
$certi.PrivateKey.VerifyHash($encodedAttrbHash, $encodedAttrbSignature) #Получаем $true
$certi.PrivateKey.VerifySignature($encodedAttrbHash, $encodedAttrbSignature) #Получаем $true