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(Lianja) 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. loPdf = createobject("CkPdf") // Load a PDF that has cryptographic signatures to be validated llSuccess = loPdf.LoadFile("qa_data/pdf/sign_testing_1/helloSigned2.pdf") if (llSuccess = .F.) then ? loPdf.LastErrorText release loPdf return endif // Each time we verify a signature, information about the signature is written into // sigInfo (replacing whatever sigInfo previously contained). loSigInfo = createobject("CkJsonObject") loSigInfo.EmitCompact = .F. // Iterate over each signature and validate each. lnNumSignatures = loPdf.NumSignatures llValidated = .F. i = 0 do while i < lnNumSignatures llValidated = loPdf.VerifySignature(i,loSigInfo) ? "Signature " + str(i) + " validated: " + str(llValidated) ? loSigInfo.Emit() i = i + 1 enddo ? "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. loJson = createobject("CkJsonObject") // 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 loUnauthAttrTimestampTokenTstInfoGenTime = createobject("CkDtObj") loSigningTime = createobject("CkDtObj") loAuthAttrSigningTimeUtctime = createobject("CkDtObj") llValidated = loJson.BoolOf("validated") lcSignatureDictionary_Contents = loJson.StringOf("signatureDictionary./Contents") lcSignatureDictionary_Filter = loJson.StringOf("signatureDictionary./Filter") lcSignatureDictionary_M = loJson.StringOf("signatureDictionary./M") lcSignatureDictionary_Name = loJson.StringOf("signatureDictionary./Name") lcSignatureDictionary_Prop_Build_App_Name = loJson.StringOf("signatureDictionary./Prop_Build./App./Name") lnSignatureDictionary_Prop_Build_App_R = loJson.IntOf("signatureDictionary./Prop_Build./App./R") lcSignatureDictionary_Prop_Build_App_REx = loJson.StringOf("signatureDictionary./Prop_Build./App./REx") llSignatureDictionary_Prop_Build_App_TrustedMode = loJson.BoolOf("signatureDictionary./Prop_Build./App./TrustedMode") lcSignatureDictionary_Prop_Build_Filter_Date = loJson.StringOf("signatureDictionary./Prop_Build./Filter./Date") lcSignatureDictionary_Prop_Build_Filter_Name = loJson.StringOf("signatureDictionary./Prop_Build./Filter./Name") lnSignatureDictionary_Prop_Build_Filter_R = loJson.IntOf("signatureDictionary./Prop_Build./Filter./R") lnSignatureDictionary_Prop_Build_Filter_V = loJson.IntOf("signatureDictionary./Prop_Build./Filter./V") lcSignatureDictionary_Prop_Build_PubSec_Date = loJson.StringOf("signatureDictionary./Prop_Build./PubSec./Date") llSignatureDictionary_Prop_Build_PubSec_NonEFontNoWarn = loJson.BoolOf("signatureDictionary./Prop_Build./PubSec./NonEFontNoWarn") lnSignatureDictionary_Prop_Build_PubSec_R = loJson.IntOf("signatureDictionary./Prop_Build./PubSec./R") lcSignatureDictionary_SubFilter = loJson.StringOf("signatureDictionary./SubFilter") lcSignatureDictionary_Type = loJson.StringOf("signatureDictionary./Type") i = 0 lnCount_i = loJson.SizeOfArray("signatureDictionary./ByteRange") do while i < lnCount_i loJson.I = i lnIntVal = loJson.IntOf("signatureDictionary./ByteRange[i]") i = i + 1 enddo i = 0 lnCount_i = loJson.SizeOfArray("signatureDictionary./Prop_Build./App./OS") do while i < lnCount_i loJson.I = i lcStrVal = loJson.StringOf("signatureDictionary./Prop_Build./App./OS[i]") i = i + 1 enddo i = 0 lnCount_i = loJson.SizeOfArray("pkcs7.verify.certs") do while i < lnCount_i loJson.I = i lcIssuerCN = loJson.StringOf("pkcs7.verify.certs[i].issuerCN") lcSerial = loJson.StringOf("pkcs7.verify.certs[i].serial") i = i + 1 enddo i = 0 lnCount_i = loJson.SizeOfArray("pkcs7.verify.digestAlgorithms") do while i < lnCount_i loJson.I = i lcStrVal = loJson.StringOf("pkcs7.verify.digestAlgorithms[i]") i = i + 1 enddo i = 0 lnCount_i = loJson.SizeOfArray("pkcs7.verify.signerInfo") do while i < lnCount_i loJson.I = i lcCertSerialNumber = loJson.StringOf("pkcs7.verify.signerInfo[i].cert.serialNumber") lcCertIssuerCN = loJson.StringOf("pkcs7.verify.signerInfo[i].cert.issuerCN") lcCertDigestAlgOid = loJson.StringOf("pkcs7.verify.signerInfo[i].cert.digestAlgOid") lcCertDigestAlgName = loJson.StringOf("pkcs7.verify.signerInfo[i].cert.digestAlgName") lcContentType = loJson.StringOf("pkcs7.verify.signerInfo[i].contentType") lcMessageDigest = loJson.StringOf("pkcs7.verify.signerInfo[i].messageDigest") lcSigningAlgOid = loJson.StringOf("pkcs7.verify.signerInfo[i].signingAlgOid") lcSigningAlgName = loJson.StringOf("pkcs7.verify.signerInfo[i].signingAlgName") lcAuthAttr1_2_840_113583_1_1_8Der = loJson.StringOf('pkcs7.verify.signerInfo[i].authAttr."1.2.840.113583.1.1.8".der') lcAuthAttrContentTypeName = loJson.StringOf('pkcs7.verify.signerInfo[i].authAttr."1.2.840.113549.1.9.3".name') lcAuthAttrContentTypeOid = loJson.StringOf('pkcs7.verify.signerInfo[i].authAttr."1.2.840.113549.1.9.3".oid') lcAuthAttrMessageDigestName = loJson.StringOf('pkcs7.verify.signerInfo[i].authAttr."1.2.840.113549.1.9.4".name') lcAuthAttrMessageDigestDigest = loJson.StringOf('pkcs7.verify.signerInfo[i].authAttr."1.2.840.113549.1.9.4".digest') lcUnauthAttrTimestampTokenName = loJson.StringOf('pkcs7.verify.signerInfo[i].unauthAttr."1.2.840.113549.1.9.16.2.14".name') lcUnauthAttrTimestampTokenDer = loJson.StringOf('pkcs7.verify.signerInfo[i].unauthAttr."1.2.840.113549.1.9.16.2.14".der') llUnauthAttrTimestampTokenTimestampSignatureVerified = loJson.BoolOf('pkcs7.verify.signerInfo[i].unauthAttr."1.2.840.113549.1.9.16.2.14".timestampSignatureVerified') lcUnauthAttrTimestampTokenTstInfoTsaPolicyId = loJson.StringOf('pkcs7.verify.signerInfo[i].unauthAttr."1.2.840.113549.1.9.16.2.14".tstInfo.tsaPolicyId') lcUnauthAttrTimestampTokenTstInfoMessageImprintHashAlg = loJson.StringOf('pkcs7.verify.signerInfo[i].unauthAttr."1.2.840.113549.1.9.16.2.14".tstInfo.messageImprint.hashAlg') lcUnauthAttrTimestampTokenTstInfoMessageImprintDigest = loJson.StringOf('pkcs7.verify.signerInfo[i].unauthAttr."1.2.840.113549.1.9.16.2.14".tstInfo.messageImprint.digest') llUnauthAttrTimestampTokenTstInfoMessageImprintDigestMatches = loJson.BoolOf('pkcs7.verify.signerInfo[i].unauthAttr."1.2.840.113549.1.9.16.2.14".tstInfo.messageImprint.digestMatches') lcUnauthAttrTimestampTokenTstInfoSerialNumber = loJson.StringOf('pkcs7.verify.signerInfo[i].unauthAttr."1.2.840.113549.1.9.16.2.14".tstInfo.serialNumber') loJson.DtOf('pkcs7.verify.signerInfo[i].unauthAttr."1.2.840.113549.1.9.16.2.14".tstInfo.genTime',.F.,loUnauthAttrTimestampTokenTstInfoGenTime) j = 0 lnCount_j = loJson.SizeOfArray('pkcs7.verify.signerInfo[i].unauthAttr."1.2.840.113549.1.9.16.2.14".verify.digestAlgorithms') do while j < lnCount_j loJson.J = j lcStrVal = loJson.StringOf('pkcs7.verify.signerInfo[i].unauthAttr."1.2.840.113549.1.9.16.2.14".verify.digestAlgorithms[j]') j = j + 1 enddo j = 0 lnCount_j = loJson.SizeOfArray('pkcs7.verify.signerInfo[i].unauthAttr."1.2.840.113549.1.9.16.2.14".verify.signerInfo') do while j < lnCount_j loJson.J = j lcCertSerialNumber = loJson.StringOf('pkcs7.verify.signerInfo[i].unauthAttr."1.2.840.113549.1.9.16.2.14".verify.signerInfo[j].cert.serialNumber') lcCertIssuerCN = loJson.StringOf('pkcs7.verify.signerInfo[i].unauthAttr."1.2.840.113549.1.9.16.2.14".verify.signerInfo[j].cert.issuerCN') lcCertDigestAlgOid = loJson.StringOf('pkcs7.verify.signerInfo[i].unauthAttr."1.2.840.113549.1.9.16.2.14".verify.signerInfo[j].cert.digestAlgOid') lcCertDigestAlgName = loJson.StringOf('pkcs7.verify.signerInfo[i].unauthAttr."1.2.840.113549.1.9.16.2.14".verify.signerInfo[j].cert.digestAlgName') lcContentType = loJson.StringOf('pkcs7.verify.signerInfo[i].unauthAttr."1.2.840.113549.1.9.16.2.14".verify.signerInfo[j].contentType') loJson.DtOf('pkcs7.verify.signerInfo[i].unauthAttr."1.2.840.113549.1.9.16.2.14".verify.signerInfo[j].signingTime',.F.,loSigningTime) lcMessageDigest = loJson.StringOf('pkcs7.verify.signerInfo[i].unauthAttr."1.2.840.113549.1.9.16.2.14".verify.signerInfo[j].messageDigest') lcSigningAlgOid = loJson.StringOf('pkcs7.verify.signerInfo[i].unauthAttr."1.2.840.113549.1.9.16.2.14".verify.signerInfo[j].signingAlgOid') lcSigningAlgName = loJson.StringOf('pkcs7.verify.signerInfo[i].unauthAttr."1.2.840.113549.1.9.16.2.14".verify.signerInfo[j].signingAlgName') lcAuthAttrContentTypeName = loJson.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') lcAuthAttrContentTypeOid = loJson.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') lcAuthAttrSigningTimeName = loJson.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') loJson.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',.F.,loAuthAttrSigningTimeUtctime) lcAuthAttrSigningCertificateName = loJson.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') lcAuthAttrSigningCertificateDer = loJson.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') lcAuthAttrMessageDigestName = loJson.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') lcAuthAttrMessageDigestDigest = loJson.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 enddo i = i + 1 enddo i = 0 lnCount_i = loJson.SizeOfArray("pkcs7.verify.pkcs7.verify.certs") do while i < lnCount_i loJson.I = i lcIssuerCN = loJson.StringOf("pkcs7.verify.pkcs7.verify.certs[i].issuerCN") lcSerial = loJson.StringOf("pkcs7.verify.pkcs7.verify.certs[i].serial") i = i + 1 enddo release loPdf release loSigInfo release loJson release loUnauthAttrTimestampTokenTstInfoGenTime release loSigningTime release loAuthAttrSigningTimeUtctime |
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