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(PHP ActiveX) 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.
<?php // 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 new COM('Chilkat_9_5_0.Chilkat.Pdf') $pdf = new COM("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 == 0) { print $pdf->LastErrorText . "\n"; exit; } // 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 new COM('Chilkat_9_5_0.Chilkat.JsonObject') $sigInfo = new COM("Chilkat.JsonObject"); $sigInfo->EmitCompact = 0; // Iterate over each signature and validate each. $numSignatures = $pdf->NumSignatures; $validated = 0; $i = 0; while ($i < $numSignatures) { $validated = $pdf->VerifySignature($i,$sigInfo); print 'Signature ' . $i . ' validated: ' . $validated . "\n"; print $sigInfo->emit() . "\n"; $i = $i + 1; } print 'Finished.' . "\n"; // 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 new COM('Chilkat_9_5_0.Chilkat.JsonObject') $json = new COM("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 new COM('Chilkat_9_5_0.Chilkat.DtObj') $unauthAttrTimestampTokenTstInfoGenTime = new COM("Chilkat.DtObj"); // For versions of Chilkat < 10.0.0, use new COM('Chilkat_9_5_0.Chilkat.DtObj') $signingTime = new COM("Chilkat.DtObj"); // For versions of Chilkat < 10.0.0, use new COM('Chilkat_9_5_0.Chilkat.DtObj') $authAttrSigningTimeUtctime = new COM("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 < $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 < $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 < $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 < $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 < $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'); $json->DtOf('pkcs7.verify.signerInfo[i].unauthAttr.\'1.2.840.113549.1.9.16.2.14\'.tstInfo.genTime',0,$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 < $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 < $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'); $json->DtOf('pkcs7.verify.signerInfo[i].unauthAttr.\'1.2.840.113549.1.9.16.2.14\'.verify.signerInfo[j].signingTime',0,$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'); $json->DtOf('pkcs7.verify.signerInfo[i].unauthAttr.\'1.2.840.113549.1.9.16.2.14\'.verify.signerInfo[j].authAttr.\'1.2.840.113549.1.9.5\'.utctime',0,$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 < $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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