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(PowerShell) Validate PDF SignaturesSee more PDF Signatures ExamplesThis example demonstrates how to validate the signatures in a PDF and also shows how to get information from each signature. Note: This example requires Chilkat v9.5.0.85 or greater.
Add-Type -Path "C:\chilkat\ChilkatDotNet47-9.5.0-x64\ChilkatDotNet47.dll" # This example requires the Chilkat API to have been previously unlocked. # See Global Unlock Sample for sample code. $pdf = New-Object Chilkat.Pdf # Load a PDF that has cryptographic signatures to be validated $success = $pdf.LoadFile("qa_data/pdf/sign_testing_1/helloSigned2.pdf") if ($success -eq $false) { $($pdf.LastErrorText) exit } # Each time we verify a signature, information about the signature is written into # sigInfo (replacing whatever sigInfo previously contained). $sigInfo = New-Object Chilkat.JsonObject $sigInfo.EmitCompact = $false # Iterate over each signature and validate each. $numSignatures = $pdf.NumSignatures $validated = $false $i = 0 while ($i -lt $numSignatures) { $validated = $pdf.VerifySignature($i,$sigInfo) $("Signature " + $i + " validated: " + $validated) $($sigInfo.Emit()) $i = $i + 1 } $("Finished.") # When VerifySignature validates a signature, a lot of information is deposited into the JSON sigInfo object. # The information can vary depending on what was included in the signature (for example, various authenticated attributes # and unauthenticated attributes may or may not be included). # Here is a sample of the information you'll see. # # The following online tool can be used to generate code to parse any given JSON. # Generate Parsing Code from JSON # { # "validated": true, # "signatureDictionary": { <--- This is the contents of the PDF Signature Dictionary for this signature. # "/ByteRange": [ # 0, # 154682, # 170512, # 3233 # ], # "/Contents": "<hex_data>", # "/Filter": "/Adobe.PPKLite", <--- The meaning of the Signature Dictionary entries are defined in the PDF format specification document. # "/M": "D:20201006110216-05'00'", # "/Name": "yubikey rsa 1024 authentication", # "/Prop_Build": { # "/App": { # "/Name": "/Adobe#20Acrobat#20Pro#20DC", # "/OS": [ # "/Win" # ], # "/R": 1313792, # "/REx": "2020.012.20048", # "/TrustedMode": true # }, # "/Filter": { # "/Date": "Sep 11 2020 16:30:54", # "/Name": "/Adobe.PPKLite", # "/R": 131104, # "/V": 2 # }, # "/PubSec": { # "/Date": "Sep 11 2020 16:30:54", # "/NonEFontNoWarn": true, # "/R": 131105 # } # }, # "/SubFilter": "/adbe.pkcs7.detached", # "/Type": "/Sig" # }, # "pkcs7": { <--- This is the content of the CMS signature. # "verify": { # "certs": [ <--- Each signing certificate is listed here (by issuer common name and signing cert's serail number (in hex)) # { # "issuerCN": "yubikey rsa 1024 authentication", # "serial": "66BE58138D761E92BC594A722932657BE26D421F" # } # ], # "digestAlgorithms": [ # "sha256" # ], # "signerInfo": [ <--- contains data from each SignerInfo # { # "cert": { # "serialNumber": "66BE58138D761E92BC594A722932657BE26D421F", # "issuerCN": "yubikey rsa 1024 authentication", # "digestAlgOid": "2.16.840.1.101.3.4.2.1", # "digestAlgName": "SHA256" # }, # "contentType": "1.2.840.113549.1.7.1", # "messageDigest": "btQOuSEvC31mdRFHtyEUPw8R9NuKfk0XPcQ6Lcmn6pk=", # "signingAlgOid": "1.2.840.113549.1.1.11", # "signingAlgName": "RSA-SHA256-PKCSV-1_5", # "authAttr": { <--- CMS authenticated attributes are contained here. # "1.2.840.113583.1.1.8": { # "der": "MAA=" # }, # "1.2.840.113549.1.9.3": { # "name": "contentType", # "oid": "1.2.840.113549.1.7.1" # }, # "1.2.840.113549.1.9.4": { # "name": "messageDigest", # "digest": "btQOuSEvC31mdRFHtyEUPw8R9NuKfk0XPcQ6Lcmn6pk=" # } # }, # "unauthAttr": { <--- CMS unauthenticated attributes are contained here. # "1.2.840.113549.1.9.16.2.14": { # "name": "timestampToken", # "der": "MIIOvAYJKo ... Es/70g=", # "verify": { # "digestAlgorithms": [ # "sha256" # ], # "signerInfo": [ # { # "cert": { # "serialNumber": "04CD3F8568AE76C61BB0FE7160CCA76D", # "issuerCN": "DigiCert SHA2 Assured ID Timestamping CA", # "digestAlgOid": "2.16.840.1.101.3.4.2.1", # "digestAlgName": "SHA256" # }, # "contentType": "1.2.840.113549.1.9.16.1.4", # "signingTime": "201006160423Z", # "messageDigest": "Atv5Rj3kidB8IR6CplYiX3o6De/k8SC6JJ6uUPAGO0g=", # "signingAlgOid": "1.2.840.113549.1.1.1", # "signingAlgName": "RSA-PKCSV-1_5", # "authAttr": { # "1.2.840.113549.1.9.3": { # "name": "contentType", # "oid": "1.2.840.113549.1.9.16.1.4" # }, # "1.2.840.113549.1.9.5": { # "name": "signingTime", # "utctime": "201006160423Z" # }, # "1.2.840.113549.1.9.16.2.12": { # "name": "signingCertificate", # "der": "MBowGDAWBBQDJb1QXtqWMC3CL0+gHkwovig0xQ==" # }, # "1.2.840.113549.1.9.4": { # "name": "messageDigest", # "digest": "Atv5Rj3kidB8IR6CplYiX3o6De/k8SC6JJ6uUPAGO0g=" # } # } # } # ] # }, # "timestampSignatureVerified": true, # "tstInfo": { # "tsaPolicyId": "2.16.840.1.114412.7.1", # "messageImprint": { # "hashAlg": "sha256", # "digest": "gLJtrRWUSDfjzDkF1MfWG1wyHA6FrUJLkWMGRG+eMlA=", # "digestMatches": true # }, # "serialNumber": "00CE57E1113970607EF63B1D1160545321", # "genTime": "20201006160423Z" # } # } # } # } # ], # "pkcs7": { # "verify": { # "certs": [ # { # "issuerCN": "DigiCert SHA2 Assured ID Timestamping CA", # "serial": "04CD3F8568AE76C61BB0FE7160CCA76D" # }, # { # "issuerCN": "DigiCert Assured ID Root CA", # "serial": "0AA125D6D6321B7E41E405DA3697C215" # } # ] # } # } # } # } # } # **** The point of this code is to show how to get at each desired piece of information contained in the signature. # **** If your signature contains additional information not shown here, then you can use the online tool to generate the parse code. # **** It is likely you're only interested in a few items of information, and therefore you wouldn't copy all of this code, but might # **** choose to use bits and pieces to get the information you find important. $json = New-Object Chilkat.JsonObject # Imagine that the "json" object contains the information obtained by validating a signature... # The code below was generated using the online tool: Generate Parsing Code from JSON $unauthAttrTimestampTokenTstInfoGenTime = New-Object Chilkat.DtObj $signingTime = New-Object Chilkat.DtObj $authAttrSigningTimeUtctime = New-Object Chilkat.DtObj $validated = $json.BoolOf("validated") $signatureDictionary_Contents = $json.StringOf("signatureDictionary./Contents") $signatureDictionary_Filter = $json.StringOf("signatureDictionary./Filter") $signatureDictionary_M = $json.StringOf("signatureDictionary./M") $signatureDictionary_Name = $json.StringOf("signatureDictionary./Name") $signatureDictionary_Prop_Build_App_Name = $json.StringOf("signatureDictionary./Prop_Build./App./Name") $signatureDictionary_Prop_Build_App_R = $json.IntOf("signatureDictionary./Prop_Build./App./R") $signatureDictionary_Prop_Build_App_REx = $json.StringOf("signatureDictionary./Prop_Build./App./REx") $signatureDictionary_Prop_Build_App_TrustedMode = $json.BoolOf("signatureDictionary./Prop_Build./App./TrustedMode") $signatureDictionary_Prop_Build_Filter_Date = $json.StringOf("signatureDictionary./Prop_Build./Filter./Date") $signatureDictionary_Prop_Build_Filter_Name = $json.StringOf("signatureDictionary./Prop_Build./Filter./Name") $signatureDictionary_Prop_Build_Filter_R = $json.IntOf("signatureDictionary./Prop_Build./Filter./R") $signatureDictionary_Prop_Build_Filter_V = $json.IntOf("signatureDictionary./Prop_Build./Filter./V") $signatureDictionary_Prop_Build_PubSec_Date = $json.StringOf("signatureDictionary./Prop_Build./PubSec./Date") $signatureDictionary_Prop_Build_PubSec_NonEFontNoWarn = $json.BoolOf("signatureDictionary./Prop_Build./PubSec./NonEFontNoWarn") $signatureDictionary_Prop_Build_PubSec_R = $json.IntOf("signatureDictionary./Prop_Build./PubSec./R") $signatureDictionary_SubFilter = $json.StringOf("signatureDictionary./SubFilter") $signatureDictionary_Type = $json.StringOf("signatureDictionary./Type") $i = 0 $count_i = $json.SizeOfArray("signatureDictionary./ByteRange") while ($i -lt $count_i) { $json.I = $i $intVal = $json.IntOf("signatureDictionary./ByteRange[i]") $i = $i + 1 } $i = 0 $count_i = $json.SizeOfArray("signatureDictionary./Prop_Build./App./OS") while ($i -lt $count_i) { $json.I = $i $strVal = $json.StringOf("signatureDictionary./Prop_Build./App./OS[i]") $i = $i + 1 } $i = 0 $count_i = $json.SizeOfArray("pkcs7.verify.certs") while ($i -lt $count_i) { $json.I = $i $issuerCN = $json.StringOf("pkcs7.verify.certs[i].issuerCN") $serial = $json.StringOf("pkcs7.verify.certs[i].serial") $i = $i + 1 } $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") $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") $messageDigest = $json.StringOf("pkcs7.verify.signerInfo[i].messageDigest") $signingAlgOid = $json.StringOf("pkcs7.verify.signerInfo[i].signingAlgOid") $signingAlgName = $json.StringOf("pkcs7.verify.signerInfo[i].signingAlgName") $authAttr1_2_840_113583_1_1_8Der = $json.StringOf("pkcs7.verify.signerInfo[i].authAttr.`"1.2.840.113583.1.1.8`".der") $authAttrContentTypeName = $json.StringOf("pkcs7.verify.signerInfo[i].authAttr.`"1.2.840.113549.1.9.3`".name") $authAttrContentTypeOid = $json.StringOf("pkcs7.verify.signerInfo[i].authAttr.`"1.2.840.113549.1.9.3`".oid") $authAttrMessageDigestName = $json.StringOf("pkcs7.verify.signerInfo[i].authAttr.`"1.2.840.113549.1.9.4`".name") $authAttrMessageDigestDigest = $json.StringOf("pkcs7.verify.signerInfo[i].authAttr.`"1.2.840.113549.1.9.4`".digest") $unauthAttrTimestampTokenName = $json.StringOf("pkcs7.verify.signerInfo[i].unauthAttr.`"1.2.840.113549.1.9.16.2.14`".name") $unauthAttrTimestampTokenDer = $json.StringOf("pkcs7.verify.signerInfo[i].unauthAttr.`"1.2.840.113549.1.9.16.2.14`".der") $unauthAttrTimestampTokenTimestampSignatureVerified = $json.BoolOf("pkcs7.verify.signerInfo[i].unauthAttr.`"1.2.840.113549.1.9.16.2.14`".timestampSignatureVerified") $unauthAttrTimestampTokenTstInfoTsaPolicyId = $json.StringOf("pkcs7.verify.signerInfo[i].unauthAttr.`"1.2.840.113549.1.9.16.2.14`".tstInfo.tsaPolicyId") $unauthAttrTimestampTokenTstInfoMessageImprintHashAlg = $json.StringOf("pkcs7.verify.signerInfo[i].unauthAttr.`"1.2.840.113549.1.9.16.2.14`".tstInfo.messageImprint.hashAlg") $unauthAttrTimestampTokenTstInfoMessageImprintDigest = $json.StringOf("pkcs7.verify.signerInfo[i].unauthAttr.`"1.2.840.113549.1.9.16.2.14`".tstInfo.messageImprint.digest") $unauthAttrTimestampTokenTstInfoMessageImprintDigestMatches = $json.BoolOf("pkcs7.verify.signerInfo[i].unauthAttr.`"1.2.840.113549.1.9.16.2.14`".tstInfo.messageImprint.digestMatches") $unauthAttrTimestampTokenTstInfoSerialNumber = $json.StringOf("pkcs7.verify.signerInfo[i].unauthAttr.`"1.2.840.113549.1.9.16.2.14`".tstInfo.serialNumber") $json.DtOf("pkcs7.verify.signerInfo[i].unauthAttr.`"1.2.840.113549.1.9.16.2.14`".tstInfo.genTime",$false,$unauthAttrTimestampTokenTstInfoGenTime) $j = 0 $count_j = $json.SizeOfArray("pkcs7.verify.signerInfo[i].unauthAttr.`"1.2.840.113549.1.9.16.2.14`".verify.digestAlgorithms") while ($j -lt $count_j) { $json.J = $j $strVal = $json.StringOf("pkcs7.verify.signerInfo[i].unauthAttr.`"1.2.840.113549.1.9.16.2.14`".verify.digestAlgorithms[j]") $j = $j + 1 } $j = 0 $count_j = $json.SizeOfArray("pkcs7.verify.signerInfo[i].unauthAttr.`"1.2.840.113549.1.9.16.2.14`".verify.signerInfo") while ($j -lt $count_j) { $json.J = $j $certSerialNumber = $json.StringOf("pkcs7.verify.signerInfo[i].unauthAttr.`"1.2.840.113549.1.9.16.2.14`".verify.signerInfo[j].cert.serialNumber") $certIssuerCN = $json.StringOf("pkcs7.verify.signerInfo[i].unauthAttr.`"1.2.840.113549.1.9.16.2.14`".verify.signerInfo[j].cert.issuerCN") $certDigestAlgOid = $json.StringOf("pkcs7.verify.signerInfo[i].unauthAttr.`"1.2.840.113549.1.9.16.2.14`".verify.signerInfo[j].cert.digestAlgOid") $certDigestAlgName = $json.StringOf("pkcs7.verify.signerInfo[i].unauthAttr.`"1.2.840.113549.1.9.16.2.14`".verify.signerInfo[j].cert.digestAlgName") $contentType = $json.StringOf("pkcs7.verify.signerInfo[i].unauthAttr.`"1.2.840.113549.1.9.16.2.14`".verify.signerInfo[j].contentType") $json.DtOf("pkcs7.verify.signerInfo[i].unauthAttr.`"1.2.840.113549.1.9.16.2.14`".verify.signerInfo[j].signingTime",$false,$signingTime) $messageDigest = $json.StringOf("pkcs7.verify.signerInfo[i].unauthAttr.`"1.2.840.113549.1.9.16.2.14`".verify.signerInfo[j].messageDigest") $signingAlgOid = $json.StringOf("pkcs7.verify.signerInfo[i].unauthAttr.`"1.2.840.113549.1.9.16.2.14`".verify.signerInfo[j].signingAlgOid") $signingAlgName = $json.StringOf("pkcs7.verify.signerInfo[i].unauthAttr.`"1.2.840.113549.1.9.16.2.14`".verify.signerInfo[j].signingAlgName") $authAttrContentTypeName = $json.StringOf("pkcs7.verify.signerInfo[i].unauthAttr.`"1.2.840.113549.1.9.16.2.14`".verify.signerInfo[j].authAttr.`"1.2.840.113549.1.9.3`".name") $authAttrContentTypeOid = $json.StringOf("pkcs7.verify.signerInfo[i].unauthAttr.`"1.2.840.113549.1.9.16.2.14`".verify.signerInfo[j].authAttr.`"1.2.840.113549.1.9.3`".oid") $authAttrSigningTimeName = $json.StringOf("pkcs7.verify.signerInfo[i].unauthAttr.`"1.2.840.113549.1.9.16.2.14`".verify.signerInfo[j].authAttr.`"1.2.840.113549.1.9.5`".name") $json.DtOf("pkcs7.verify.signerInfo[i].unauthAttr.`"1.2.840.113549.1.9.16.2.14`".verify.signerInfo[j].authAttr.`"1.2.840.113549.1.9.5`".utctime",$false,$authAttrSigningTimeUtctime) $authAttrSigningCertificateName = $json.StringOf("pkcs7.verify.signerInfo[i].unauthAttr.`"1.2.840.113549.1.9.16.2.14`".verify.signerInfo[j].authAttr.`"1.2.840.113549.1.9.16.2.12`".name") $authAttrSigningCertificateDer = $json.StringOf("pkcs7.verify.signerInfo[i].unauthAttr.`"1.2.840.113549.1.9.16.2.14`".verify.signerInfo[j].authAttr.`"1.2.840.113549.1.9.16.2.12`".der") $authAttrMessageDigestName = $json.StringOf("pkcs7.verify.signerInfo[i].unauthAttr.`"1.2.840.113549.1.9.16.2.14`".verify.signerInfo[j].authAttr.`"1.2.840.113549.1.9.4`".name") $authAttrMessageDigestDigest = $json.StringOf("pkcs7.verify.signerInfo[i].unauthAttr.`"1.2.840.113549.1.9.16.2.14`".verify.signerInfo[j].authAttr.`"1.2.840.113549.1.9.4`".digest") $j = $j + 1 } $i = $i + 1 } $i = 0 $count_i = $json.SizeOfArray("pkcs7.verify.pkcs7.verify.certs") while ($i -lt $count_i) { $json.I = $i $issuerCN = $json.StringOf("pkcs7.verify.pkcs7.verify.certs[i].issuerCN") $serial = $json.StringOf("pkcs7.verify.pkcs7.verify.certs[i].serial") $i = $i + 1 } |
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