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(Excel) 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.
' This example requires the Chilkat API to have been previously unlocked. ' See Global Unlock Sample for sample code. Dim pdf As Chilkat.Pdf Set pdf = Chilkat.NewPdf ' Load a PDF that has cryptographic signatures to be validated success = pdf.LoadFile("qa_data/pdf/sign_testing_1/helloSigned2.pdf") If (success = False) Then Debug.Print pdf.LastErrorText Exit Sub End If ' Each time we verify a signature, information about the signature is written into ' sigInfo (replacing whatever sigInfo previously contained). Dim sigInfo As Chilkat.JsonObject Set sigInfo = Chilkat.NewJsonObject sigInfo.EmitCompact = False ' Iterate over each signature and validate each. numSignatures = pdf.NumSignatures validated = False i = 0 Do While i < numSignatures validated = pdf.VerifySignature(i,sigInfo) Debug.Print "Signature "; i; " validated: "; validated Debug.Print sigInfo.Emit() i = i + 1 Loop Debug.Print "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. Dim json As Chilkat.JsonObject Set json = Chilkat.NewJsonObject ' 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 Dim unauthAttrTimestampTokenTstInfoGenTime As Chilkat.DtObj Set unauthAttrTimestampTokenTstInfoGenTime = Chilkat.NewDtObj Dim signingTime As Chilkat.DtObj Set signingTime = Chilkat.NewDtObj Dim authAttrSigningTimeUtctime As Chilkat.DtObj Set authAttrSigningTimeUtctime = Chilkat.NewDtObj 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") Do While i < count_i json.I = i intVal = json.IntOf("signatureDictionary./ByteRange[i]") i = i + 1 Loop i = 0 count_i = json.SizeOfArray("signatureDictionary./Prop_Build./App./OS") Do While i < count_i json.I = i strVal = json.StringOf("signatureDictionary./Prop_Build./App./OS[i]") i = i + 1 Loop i = 0 count_i = json.SizeOfArray("pkcs7.verify.certs") Do While i < count_i json.I = i issuerCN = json.StringOf("pkcs7.verify.certs[i].issuerCN") serial = json.StringOf("pkcs7.verify.certs[i].serial") i = i + 1 Loop i = 0 count_i = json.SizeOfArray("pkcs7.verify.digestAlgorithms") Do While i < count_i json.I = i strVal = json.StringOf("pkcs7.verify.digestAlgorithms[i]") i = i + 1 Loop i = 0 count_i = json.SizeOfArray("pkcs7.verify.signerInfo") Do While i < 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") Dim success As Boolean success = 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") Do While j < 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 Loop j = 0 count_j = json.SizeOfArray("pkcs7.verify.signerInfo[i].unauthAttr.""1.2.840.113549.1.9.16.2.14"".verify.signerInfo") Do While j < 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") success = 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") success = 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 Loop i = i + 1 Loop i = 0 count_i = json.SizeOfArray("pkcs7.verify.pkcs7.verify.certs") Do While i < 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 Loop |
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