PowerShell Requires Chilkat v11.0.0+

P7S - Access Signature Information (date/time, certificate used, etc.)

See more Digital Signatures Examples

Examine a PKCS7 signature (.p7s) and get information about it. PowerShell

Add-Type -Path "C:\chilkat\ChilkatDotNet47-x64\ChilkatDotNet47.dll"

$success = $false

#  This requires the Chilkat API to have been previously unlocked.
#  See Global Unlock Sample for sample code.

#  First load the .p7s file into a BinData object..
$bd = New-Object Chilkat.BinData
$success = $bd.LoadFile("qa_data/p7s/sample.p7s")
if ($success -ne $true) {
    $("Failed to load .p7s file.")
    exit
}

$crypt = New-Object Chilkat.Crypt2

#  Assuming this is a signature that contains the original data that was signed..
$success = $crypt.OpaqueVerifyBd($bd)
if ($success -eq $false) {
    $($crypt.LastErrorText)
    exit
}

#  Examine the last JSON data after signature verification..
$json = New-Object Chilkat.JsonObject
$crypt.GetLastJsonData($json)

$json.EmitCompact = $false
$($json.Emit())

#  Sample output...
#  Go to http://tools.chilkat.io/jsonParse.cshtml
#  and paste the JSON into the online form to generate JSON parsing code.

#  {
#    "pkcs7": {
#      "verify": {
#        "digestAlgorithms": [
#          "sha256"
#        ],
#        "signerInfo": [
#          {
#            "cert": {
#              "serialNumber": "AAC5FC48C0FD8FBB",
#              "issuerCN": "AC ABCDEF RFB v5",
#              "issuerDN": "",
#              "digestAlgOid": "2.16.840.1.101.3.4.2.1",
#              "digestAlgName": "SHA-256"
#            },
#            "contentType": "1.2.840.113549.1.7.1",
#            "signingTime": "180607195054Z",
#            "messageDigest": "trzyxXbZ96z2M4mncyZ7BNMV4yIT92+5sS27Fu64iG8=",
#            "signingAlgOid": "1.2.840.113549.1.1.11",
#            "signerDigest": "trzyxXbZ96z2M4mncyZ7BNMV4yIT92+5sS27Fu64iG8="
#          },
#          {
#            "cert": {
#              "serialNumber": "324FB38ABD59723F",
#              "issuerCN": "AC ABCDEF RFB v5",
#              "issuerDN": "",
#              "digestAlgOid": "2.16.840.1.101.3.4.2.1",
#              "digestAlgName": "SHA-256"
#            },
#            "contentType": "1.2.840.113549.1.7.1",
#            "signingTime": "180608182517Z",
#            "messageDigest": "trzyxXbZ96z2M4mncyZ7BNMV4yIT92+5sS27Fu64iG8=",
#            "signingAlgOid": "1.2.840.113549.1.1.11",
#            "signerDigest": "trzyxXbZ96z2M4mncyZ7BNMV4yIT92+5sS27Fu64iG8="
#          }
#        ]
#      }
#    }
#  }
#  

$dt = New-Object Chilkat.CkDateTime

$i = 0
$count_i = $json.SizeOfArray("pkcs7.verify.digestAlgorithms")
while ($i -lt $count_i) {
    $json.I = $i
    $strVal = $json.StringOf("pkcs7.verify.digestAlgorithms[i]")
    $i = $i + 1
}

$i = 0
$count_i = $json.SizeOfArray("pkcs7.verify.signerInfo")
while ($i -lt $count_i) {
    $json.I = $i
    $certSerialNumber = $json.StringOf("pkcs7.verify.signerInfo[i].cert.serialNumber")
    $certIssuerCN = $json.StringOf("pkcs7.verify.signerInfo[i].cert.issuerCN")
    $certIssuerDN = $json.StringOf("pkcs7.verify.signerInfo[i].cert.issuerDN")
    $certDigestAlgOid = $json.StringOf("pkcs7.verify.signerInfo[i].cert.digestAlgOid")
    $certDigestAlgName = $json.StringOf("pkcs7.verify.signerInfo[i].cert.digestAlgName")
    $contentType = $json.StringOf("pkcs7.verify.signerInfo[i].contentType")
    $signingTime = $json.StringOf("pkcs7.verify.signerInfo[i].signingTime")

    #  The signingTime isin UTCTime format.
    #  UTCTime values take the form of either "YYMMDDhhmm[ss]Z" or "YYMMDDhhmm[ss](+|-)hhmm"
    #  Starting in Chilkat v9.5.0.77, the SetFromTimestamp method auto-recognizes the UTCTime format and parses it correctly.
    $success = $dt.SetFromTimestamp($signingTime)
    #  To get the signingTime in other date/time formats, look at the online reference documentation for CkDateTime.
    #  There are numerous methods such as GetAsDateTime, GetAsIso8601, GetAsUnixTime, GetAsRfc822, etc.

    $messageDigest = $json.StringOf("pkcs7.verify.signerInfo[i].messageDigest")
    $signingAlgOid = $json.StringOf("pkcs7.verify.signerInfo[i].signingAlgOid")
    $signerDigest = $json.StringOf("pkcs7.verify.signerInfo[i].signerDigest")
    $i = $i + 1
}

#  println crypt.LastErrorText;
$("Success.")