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(Swift 3,4,5...) 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.
func chilkatTest() { // This example requires the Chilkat API to have been previously unlocked. // See Global Unlock Sample for sample code. let pdf = CkoPdf()! // Load a PDF that has cryptographic signatures to be validated var success: Bool = pdf.loadFile("qa_data/pdf/sign_testing_1/helloSigned2.pdf") if success == false { print("\(pdf.lastErrorText!)") return } // Each time we verify a signature, information about the signature is written into // sigInfo (replacing whatever sigInfo previously contained). let sigInfo = CkoJsonObject()! sigInfo.emitCompact = false // Iterate over each signature and validate each. var numSignatures: Int = pdf.numSignatures.intValue var validated: Bool = false var i: Int = 0 while i < numSignatures { validated = pdf.verifySignature(i, sigInfo: sigInfo) print("Signature \(i) validated: \(validated)") print("\(sigInfo.emit()!)") i = i + 1 } 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. let json = CkoJsonObject()! // 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 let unauthAttrTimestampTokenTstInfoGenTime = CkoDtObj()! let signingTime = CkoDtObj()! let authAttrSigningTimeUtctime = CkoDtObj()! var intVal: Int var strVal: String? var issuerCN: String? var serial: String? var certSerialNumber: String? var certIssuerCN: String? var certDigestAlgOid: String? var certDigestAlgName: String? var contentType: String? var messageDigest: String? var signingAlgOid: String? var signingAlgName: String? var authAttr1_2_840_113583_1_1_8Der: String? var authAttrContentTypeName: String? var authAttrContentTypeOid: String? var authAttrMessageDigestName: String? var authAttrMessageDigestDigest: String? var unauthAttrTimestampTokenName: String? var unauthAttrTimestampTokenDer: String? var unauthAttrTimestampTokenTimestampSignatureVerified: Bool var unauthAttrTimestampTokenTstInfoTsaPolicyId: String? var unauthAttrTimestampTokenTstInfoMessageImprintHashAlg: String? var unauthAttrTimestampTokenTstInfoMessageImprintDigest: String? var unauthAttrTimestampTokenTstInfoMessageImprintDigestMatches: Bool var unauthAttrTimestampTokenTstInfoSerialNumber: String? var j: Int var count_j: Int var authAttrSigningTimeName: String? var authAttrSigningCertificateName: String? var authAttrSigningCertificateDer: String? validated = json.bool(of: "validated") var signatureDictionary_Contents: String? = json.string(of: "signatureDictionary./Contents") var signatureDictionary_Filter: String? = json.string(of: "signatureDictionary./Filter") var signatureDictionary_M: String? = json.string(of: "signatureDictionary./M") var signatureDictionary_Name: String? = json.string(of: "signatureDictionary./Name") var signatureDictionary_Prop_Build_App_Name: String? = json.string(of: "signatureDictionary./Prop_Build./App./Name") var signatureDictionary_Prop_Build_App_R: Int = json.int(of: "signatureDictionary./Prop_Build./App./R").intValue var signatureDictionary_Prop_Build_App_REx: String? = json.string(of: "signatureDictionary./Prop_Build./App./REx") var signatureDictionary_Prop_Build_App_TrustedMode: Bool = json.bool(of: "signatureDictionary./Prop_Build./App./TrustedMode") var signatureDictionary_Prop_Build_Filter_Date: String? = json.string(of: "signatureDictionary./Prop_Build./Filter./Date") var signatureDictionary_Prop_Build_Filter_Name: String? = json.string(of: "signatureDictionary./Prop_Build./Filter./Name") var signatureDictionary_Prop_Build_Filter_R: Int = json.int(of: "signatureDictionary./Prop_Build./Filter./R").intValue var signatureDictionary_Prop_Build_Filter_V: Int = json.int(of: "signatureDictionary./Prop_Build./Filter./V").intValue var signatureDictionary_Prop_Build_PubSec_Date: String? = json.string(of: "signatureDictionary./Prop_Build./PubSec./Date") var signatureDictionary_Prop_Build_PubSec_NonEFontNoWarn: Bool = json.bool(of: "signatureDictionary./Prop_Build./PubSec./NonEFontNoWarn") var signatureDictionary_Prop_Build_PubSec_R: Int = json.int(of: "signatureDictionary./Prop_Build./PubSec./R").intValue var signatureDictionary_SubFilter: String? = json.string(of: "signatureDictionary./SubFilter") var signatureDictionary_Type: String? = json.string(of: "signatureDictionary./Type") i = 0 var count_i: Int = json.size(ofArray: "signatureDictionary./ByteRange").intValue while i < count_i { json.i = i intVal = json.int(of: "signatureDictionary./ByteRange[i]").intValue i = i + 1 } i = 0 count_i = json.size(ofArray: "signatureDictionary./Prop_Build./App./OS").intValue while i < count_i { json.i = i strVal = json.string(of: "signatureDictionary./Prop_Build./App./OS[i]") i = i + 1 } i = 0 count_i = json.size(ofArray: "pkcs7.verify.certs").intValue while i < count_i { json.i = i issuerCN = json.string(of: "pkcs7.verify.certs[i].issuerCN") serial = json.string(of: "pkcs7.verify.certs[i].serial") i = i + 1 } i = 0 count_i = json.size(ofArray: "pkcs7.verify.digestAlgorithms").intValue while i < count_i { json.i = i strVal = json.string(of: "pkcs7.verify.digestAlgorithms[i]") i = i + 1 } i = 0 count_i = json.size(ofArray: "pkcs7.verify.signerInfo").intValue while i < count_i { json.i = i certSerialNumber = json.string(of: "pkcs7.verify.signerInfo[i].cert.serialNumber") certIssuerCN = json.string(of: "pkcs7.verify.signerInfo[i].cert.issuerCN") certDigestAlgOid = json.string(of: "pkcs7.verify.signerInfo[i].cert.digestAlgOid") certDigestAlgName = json.string(of: "pkcs7.verify.signerInfo[i].cert.digestAlgName") contentType = json.string(of: "pkcs7.verify.signerInfo[i].contentType") messageDigest = json.string(of: "pkcs7.verify.signerInfo[i].messageDigest") signingAlgOid = json.string(of: "pkcs7.verify.signerInfo[i].signingAlgOid") signingAlgName = json.string(of: "pkcs7.verify.signerInfo[i].signingAlgName") authAttr1_2_840_113583_1_1_8Der = json.string(of: "pkcs7.verify.signerInfo[i].authAttr.\"1.2.840.113583.1.1.8\".der") authAttrContentTypeName = json.string(of: "pkcs7.verify.signerInfo[i].authAttr.\"1.2.840.113549.1.9.3\".name") authAttrContentTypeOid = json.string(of: "pkcs7.verify.signerInfo[i].authAttr.\"1.2.840.113549.1.9.3\".oid") authAttrMessageDigestName = json.string(of: "pkcs7.verify.signerInfo[i].authAttr.\"1.2.840.113549.1.9.4\".name") authAttrMessageDigestDigest = json.string(of: "pkcs7.verify.signerInfo[i].authAttr.\"1.2.840.113549.1.9.4\".digest") unauthAttrTimestampTokenName = json.string(of: "pkcs7.verify.signerInfo[i].unauthAttr.\"1.2.840.113549.1.9.16.2.14\".name") unauthAttrTimestampTokenDer = json.string(of: "pkcs7.verify.signerInfo[i].unauthAttr.\"1.2.840.113549.1.9.16.2.14\".der") unauthAttrTimestampTokenTimestampSignatureVerified = json.bool(of: "pkcs7.verify.signerInfo[i].unauthAttr.\"1.2.840.113549.1.9.16.2.14\".timestampSignatureVerified") unauthAttrTimestampTokenTstInfoTsaPolicyId = json.string(of: "pkcs7.verify.signerInfo[i].unauthAttr.\"1.2.840.113549.1.9.16.2.14\".tstInfo.tsaPolicyId") unauthAttrTimestampTokenTstInfoMessageImprintHashAlg = json.string(of: "pkcs7.verify.signerInfo[i].unauthAttr.\"1.2.840.113549.1.9.16.2.14\".tstInfo.messageImprint.hashAlg") unauthAttrTimestampTokenTstInfoMessageImprintDigest = json.string(of: "pkcs7.verify.signerInfo[i].unauthAttr.\"1.2.840.113549.1.9.16.2.14\".tstInfo.messageImprint.digest") unauthAttrTimestampTokenTstInfoMessageImprintDigestMatches = json.bool(of: "pkcs7.verify.signerInfo[i].unauthAttr.\"1.2.840.113549.1.9.16.2.14\".tstInfo.messageImprint.digestMatches") unauthAttrTimestampTokenTstInfoSerialNumber = json.string(of: "pkcs7.verify.signerInfo[i].unauthAttr.\"1.2.840.113549.1.9.16.2.14\".tstInfo.serialNumber") json.dt(of: "pkcs7.verify.signerInfo[i].unauthAttr.\"1.2.840.113549.1.9.16.2.14\".tstInfo.genTime", bLocal: false, dt: unauthAttrTimestampTokenTstInfoGenTime) j = 0 count_j = json.size(ofArray: "pkcs7.verify.signerInfo[i].unauthAttr.\"1.2.840.113549.1.9.16.2.14\".verify.digestAlgorithms").intValue while j < count_j { json.j = j strVal = json.string(of: "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.size(ofArray: "pkcs7.verify.signerInfo[i].unauthAttr.\"1.2.840.113549.1.9.16.2.14\".verify.signerInfo").intValue while j < count_j { json.j = j certSerialNumber = json.string(of: "pkcs7.verify.signerInfo[i].unauthAttr.\"1.2.840.113549.1.9.16.2.14\".verify.signerInfo[j].cert.serialNumber") certIssuerCN = json.string(of: "pkcs7.verify.signerInfo[i].unauthAttr.\"1.2.840.113549.1.9.16.2.14\".verify.signerInfo[j].cert.issuerCN") certDigestAlgOid = json.string(of: "pkcs7.verify.signerInfo[i].unauthAttr.\"1.2.840.113549.1.9.16.2.14\".verify.signerInfo[j].cert.digestAlgOid") certDigestAlgName = json.string(of: "pkcs7.verify.signerInfo[i].unauthAttr.\"1.2.840.113549.1.9.16.2.14\".verify.signerInfo[j].cert.digestAlgName") contentType = json.string(of: "pkcs7.verify.signerInfo[i].unauthAttr.\"1.2.840.113549.1.9.16.2.14\".verify.signerInfo[j].contentType") json.dt(of: "pkcs7.verify.signerInfo[i].unauthAttr.\"1.2.840.113549.1.9.16.2.14\".verify.signerInfo[j].signingTime", bLocal: false, dt: signingTime) messageDigest = json.string(of: "pkcs7.verify.signerInfo[i].unauthAttr.\"1.2.840.113549.1.9.16.2.14\".verify.signerInfo[j].messageDigest") signingAlgOid = json.string(of: "pkcs7.verify.signerInfo[i].unauthAttr.\"1.2.840.113549.1.9.16.2.14\".verify.signerInfo[j].signingAlgOid") signingAlgName = json.string(of: "pkcs7.verify.signerInfo[i].unauthAttr.\"1.2.840.113549.1.9.16.2.14\".verify.signerInfo[j].signingAlgName") authAttrContentTypeName = json.string(of: "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.string(of: "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.string(of: "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.dt(of: "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", bLocal: false, dt: authAttrSigningTimeUtctime) authAttrSigningCertificateName = json.string(of: "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.string(of: "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.string(of: "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.string(of: "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.size(ofArray: "pkcs7.verify.pkcs7.verify.certs").intValue while i < count_i { json.i = i issuerCN = json.string(of: "pkcs7.verify.pkcs7.verify.certs[i].issuerCN") serial = json.string(of: "pkcs7.verify.pkcs7.verify.certs[i].serial") i = i + 1 } } |
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