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(Go) 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. 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 { fmt.Println(pdf.LastErrorText()) pdf.DisposePdf() return } // Each time we verify a signature, information about the signature is written into // sigInfo (replacing whatever sigInfo previously contained). sigInfo := chilkat.NewJsonObject() sigInfo.SetEmitCompact(false) // Iterate over each signature and validate each. numSignatures := pdf.NumSignatures() validated := false i := 0 for i < numSignatures { validated = pdf.VerifySignature(i,sigInfo) fmt.Println("Signature ", i, " validated: ", validated) fmt.Println(*sigInfo.Emit()) i = i + 1 } fmt.Println("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. 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 unauthAttrTimestampTokenTstInfoGenTime := chilkat.NewDtObj() signingTime := chilkat.NewDtObj() authAttrSigningTimeUtctime := chilkat.NewDtObj() var intVal int var strVal *string = new(string) var issuerCN *string = new(string) var serial *string = new(string) var certSerialNumber *string = new(string) var certIssuerCN *string = new(string) var certDigestAlgOid *string = new(string) var certDigestAlgName *string = new(string) var contentType *string = new(string) var messageDigest *string = new(string) var signingAlgOid *string = new(string) var signingAlgName *string = new(string) var authAttr1_2_840_113583_1_1_8Der *string = new(string) var authAttrContentTypeName *string = new(string) var authAttrContentTypeOid *string = new(string) var authAttrMessageDigestName *string = new(string) var authAttrMessageDigestDigest *string = new(string) var unauthAttrTimestampTokenName *string = new(string) var unauthAttrTimestampTokenDer *string = new(string) var unauthAttrTimestampTokenTimestampSignatureVerified bool var unauthAttrTimestampTokenTstInfoTsaPolicyId *string = new(string) var unauthAttrTimestampTokenTstInfoMessageImprintHashAlg *string = new(string) var unauthAttrTimestampTokenTstInfoMessageImprintDigest *string = new(string) var unauthAttrTimestampTokenTstInfoMessageImprintDigestMatches bool var unauthAttrTimestampTokenTstInfoSerialNumber *string = new(string) var j int var count_j int var authAttrSigningTimeName *string = new(string) var authAttrSigningCertificateName *string = new(string) var authAttrSigningCertificateDer *string = new(string) 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") for i < count_i { json.SetI(i) intVal = json.IntOf("signatureDictionary./ByteRange[i]") i = i + 1 } i = 0 count_i = json.SizeOfArray("signatureDictionary./Prop_Build./App./OS") for i < count_i { json.SetI(i) strVal = json.StringOf("signatureDictionary./Prop_Build./App./OS[i]") i = i + 1 } i = 0 count_i = json.SizeOfArray("pkcs7.verify.certs") for i < count_i { json.SetI(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") for i < count_i { json.SetI(i) strVal = json.StringOf("pkcs7.verify.digestAlgorithms[i]") i = i + 1 } i = 0 count_i = json.SizeOfArray("pkcs7.verify.signerInfo") for i < count_i { json.SetI(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",false,unauthAttrTimestampTokenTstInfoGenTime) j = 0 count_j = json.SizeOfArray("pkcs7.verify.signerInfo[i].unauthAttr.\"1.2.840.113549.1.9.16.2.14\".verify.digestAlgorithms") for j < count_j { json.SetJ(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") for j < count_j { json.SetJ(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",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") 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 } i = i + 1 } i = 0 count_i = json.SizeOfArray("pkcs7.verify.pkcs7.verify.certs") for i < count_i { json.SetI(i) issuerCN = json.StringOf("pkcs7.verify.pkcs7.verify.certs[i].issuerCN") serial = json.StringOf("pkcs7.verify.pkcs7.verify.certs[i].serial") i = i + 1 } pdf.DisposePdf() sigInfo.DisposeJsonObject() json.DisposeJsonObject() unauthAttrTimestampTokenTstInfoGenTime.DisposeDtObj() signingTime.DisposeDtObj() authAttrSigningTimeUtctime.DisposeDtObj() |
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