Swift
Swift
Validate PDF Signatures
See more PDF Signatures Examples
This 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.
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func chilkatTest() {
var success: Bool = false
// 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
success = pdf.loadFile(filePath: "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(index: 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
}
}