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(Chilkat2-Python) 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.
import sys import chilkat2 # This example requires the Chilkat API to have been previously unlocked. # See Global Unlock Sample for sample code. pdf = chilkat2.Pdf() # Load a PDF that has cryptographic signatures to be validated success = pdf.LoadFile("qa_data/pdf/sign_testing_1/helloSigned2.pdf") if (success == False): print(pdf.LastErrorText) sys.exit() # Each time we verify a signature, information about the signature is written into # sigInfo (replacing whatever sigInfo previously contained). sigInfo = chilkat2.JsonObject() sigInfo.EmitCompact = False # Iterate over each signature and validate each. numSignatures = pdf.NumSignatures validated = False i = 0 while i < numSignatures : validated = pdf.VerifySignature(i,sigInfo) print("Signature " + str(i) + " validated: " + str(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. json = chilkat2.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 unauthAttrTimestampTokenTstInfoGenTime = chilkat2.DtObj() signingTime = chilkat2.DtObj() authAttrSigningTimeUtctime = chilkat2.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",False,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",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") 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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