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(Visual FoxPro) 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.
LOCAL loPdf LOCAL lnSuccess LOCAL loSigInfo LOCAL lnNumSignatures LOCAL lnValidated LOCAL i LOCAL loJson LOCAL loUnauthAttrTimestampTokenTstInfoGenTime LOCAL loSigningTime LOCAL loAuthAttrSigningTimeUtctime LOCAL lnIntVal LOCAL lcStrVal LOCAL lcIssuerCN LOCAL lcSerial LOCAL lcCertSerialNumber LOCAL lcCertIssuerCN LOCAL lcCertDigestAlgOid LOCAL lcCertDigestAlgName LOCAL lcContentType LOCAL lcMessageDigest LOCAL lcSigningAlgOid LOCAL lcSigningAlgName LOCAL lcAuthAttr1_2_840_113583_1_1_8Der LOCAL lcAuthAttrContentTypeName LOCAL lcAuthAttrContentTypeOid LOCAL lcAuthAttrMessageDigestName LOCAL lcAuthAttrMessageDigestDigest LOCAL lcUnauthAttrTimestampTokenName LOCAL lcUnauthAttrTimestampTokenDer LOCAL lnUnauthAttrTimestampTokenTimestampSignatureVerified LOCAL lcUnauthAttrTimestampTokenTstInfoTsaPolicyId LOCAL lcUnauthAttrTimestampTokenTstInfoMessageImprintHashAlg LOCAL lcUnauthAttrTimestampTokenTstInfoMessageImprintDigest LOCAL lnUnauthAttrTimestampTokenTstInfoMessageImprintDigestMatches LOCAL lcUnauthAttrTimestampTokenTstInfoSerialNumber LOCAL j LOCAL lnCount_j LOCAL lcAuthAttrSigningTimeName LOCAL lcAuthAttrSigningCertificateName LOCAL lcAuthAttrSigningCertificateDer LOCAL lcSignatureDictionary_Contents LOCAL lcSignatureDictionary_Filter LOCAL lcSignatureDictionary_M LOCAL lcSignatureDictionary_Name LOCAL lcSignatureDictionary_Prop_Build_App_Name LOCAL lnSignatureDictionary_Prop_Build_App_R LOCAL lcSignatureDictionary_Prop_Build_App_REx LOCAL lnSignatureDictionary_Prop_Build_App_TrustedMode LOCAL lcSignatureDictionary_Prop_Build_Filter_Date LOCAL lcSignatureDictionary_Prop_Build_Filter_Name LOCAL lnSignatureDictionary_Prop_Build_Filter_R LOCAL lnSignatureDictionary_Prop_Build_Filter_V LOCAL lcSignatureDictionary_Prop_Build_PubSec_Date LOCAL lnSignatureDictionary_Prop_Build_PubSec_NonEFontNoWarn LOCAL lnSignatureDictionary_Prop_Build_PubSec_R LOCAL lcSignatureDictionary_SubFilter LOCAL lcSignatureDictionary_Type LOCAL lnCount_i * This example requires the Chilkat API to have been previously unlocked. * See Global Unlock Sample for sample code. * For versions of Chilkat < 10.0.0, use CreateObject('Chilkat_9_5_0.Pdf') loPdf = CreateObject('Chilkat.Pdf') * Load a PDF that has cryptographic signatures to be validated lnSuccess = loPdf.LoadFile("qa_data/pdf/sign_testing_1/helloSigned2.pdf") IF (lnSuccess = 0) THEN ? loPdf.LastErrorText RELEASE loPdf CANCEL ENDIF * Each time we verify a signature, information about the signature is written into * sigInfo (replacing whatever sigInfo previously contained). * For versions of Chilkat < 10.0.0, use CreateObject('Chilkat_9_5_0.JsonObject') loSigInfo = CreateObject('Chilkat.JsonObject') loSigInfo.EmitCompact = 0 * Iterate over each signature and validate each. lnNumSignatures = loPdf.NumSignatures lnValidated = 0 i = 0 DO WHILE i < lnNumSignatures lnValidated = loPdf.VerifySignature(i,loSigInfo) ? "Signature " + STR(i) + " validated: " + STR(lnValidated) ? 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. * For versions of Chilkat < 10.0.0, use CreateObject('Chilkat_9_5_0.JsonObject') loJson = CreateObject('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 * For versions of Chilkat < 10.0.0, use CreateObject('Chilkat_9_5_0.DtObj') loUnauthAttrTimestampTokenTstInfoGenTime = CreateObject('Chilkat.DtObj') * For versions of Chilkat < 10.0.0, use CreateObject('Chilkat_9_5_0.DtObj') loSigningTime = CreateObject('Chilkat.DtObj') * For versions of Chilkat < 10.0.0, use CreateObject('Chilkat_9_5_0.DtObj') loAuthAttrSigningTimeUtctime = CreateObject('Chilkat.DtObj') lnValidated = 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") lnSignatureDictionary_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") lnSignatureDictionary_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') lnUnauthAttrTimestampTokenTimestampSignatureVerified = 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') lnUnauthAttrTimestampTokenTstInfoMessageImprintDigestMatches = 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',0,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',0,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',0,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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