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Chilkat2-Python Examples

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(Chilkat2-Python) Validate CAdES-T Signature (.p7m)

Validates a CAdES-T CMS signature and extracts the time-stamp token and gets information about it. Also validates the time-stamp token.

Note: This example requires Chilkat v9.5.0.78 or greater.

Chilkat2 Python Downloads

Python Module for Windows, Linux, Alpine Linux,
MAC OS X, Solaris, FreeBSD, OpenBSD,
Raspberry Pi and other single board computers

import chilkat2

# This example requires the Chilkat API to have been previously unlocked.
# See Global Unlock Sample for sample code.

crypt = chilkat2.Crypt2()

# Indicate that the CAdES-T timestamp tokens must also pass validation for the signature to be validated.
cmsOptions = chilkat2.JsonObject()
cmsOptions.UpdateBool("ValidateTimestampTokens",True)
crypt.CmsOptions = cmsOptions.Emit()

# Validate the .p7m and extract the original signed data to an output file.
# Note: The timestampToken is an unauthenticated attribute.  See the code below that parses the LastJsonData
# for details about examining timestampToken.
success = crypt.VerifyP7M("qa_data/cades/CAdES-T/Signature-C-T-1.p7m","qa_output/out.dat")

# Get information about the CMS signature in the LastJsonData.
# The detailed results of the signature validation are available in LastJsonData.
# (If the non-success return status was caused by an error such as "file not found", then the
# LastJsonData would be empty.)
# json is a CkJsonObject
json = crypt.LastJsonData()
json.EmitCompact = False
print(json.Emit())

# Here is a sample result:
# See the parsing code below..

# Use this online tool to generate parsing code from sample JSON: 
# Generate Parsing Code from JSON

# {
#   "pkcs7": {
#     "verify": {
#       "digestAlgorithms": [
#         "sha256"
#       ],
#       "signerInfo": [
#         {
#           "cert": {
#             "serialNumber": "00DCB814678CDB",
#             "issuerCN": "LevelBCAOK",
#             "issuerDN": "",
#             "digestAlgOid": "2.16.840.1.101.3.4.2.1",
#             "digestAlgName": "SHA256"
#           },
#           "contentType": "1.2.840.113549.1.7.1",
#           "signingTime": "131203065741Z",
#           "messageDigest": "JJZt41Nt8VsYahP+Xti4rR3vBDkUfRd6gquItl6R5Os=",
#           "signingAlgOid": "1.2.840.113549.1.1.1",
#           "signingAlgName": "RSA-PKCSV-1_5",
#           "authAttr": {
#             "1.2.840.113549.1.9.3": {
#               "name": "contentType",
#               "oid": "1.2.840.113549.1.7.1"
#             },
#             "1.2.840.113549.1.9.5": {
#               "name": "signingTime",
#               "utctime": "131203065741Z"
#             },
#             "1.2.840.113549.1.9.4": {
#               "name": "messageDigest",
#               "digest": "JJZt41Nt8VsYahP+Xti4rR3vBDkUfRd6gquItl6R5Os="
#             },
#             "1.2.840.113549.1.9.16.2.47": {
#               "name": "signingCertificateV2",
#               "der": "MIGIMIGFMIGCBCBJrxOU0w0dWGsVovjLv9QDH3syB5mLVv3grSYA40x9IDBeMFOkUTBPMQswCQYDVQQGEwJGUjENMAsGA1UEChMERVRTSTEcMBoGA1UECwwTUGx1Z3Rlc3RzXzIwMTMtMjAxNDETMBEGA1UEAxMKTGV2ZWxCQ0FPSwIHANy4FGeM2w=="
#             }
#           },
#           "unauthAttr": {
#             "1.2.840.113549.1.9.16.2.14": {
#               "name": "timestampToken",
#               "der": "MIIL+AYJKoZI...u7CfcjURNTY=",
#               "verify": {
#                 "digestAlgorithms": [
#                   "sha256"
#                 ],
#                 "signerInfo": [
#                   {
#                     "cert": {
#                       "serialNumber": "01AA4592D36C61",
#                       "issuerCN": "RootCAOK",
#                       "issuerDN": "",
#                       "digestAlgOid": "2.16.840.1.101.3.4.2.1",
#                       "digestAlgName": "SHA256"
#                     },
#                     "contentType": "1.2.840.113549.1.9.16.1.4",
#                     "messageDigest": "NSsMUrfoyCQ0OszPE1YLx1j3EyyCiBmnE5Sua6ghu/Q=",
#                     "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"
#                       },
#                       "1.2.840.113549.1.9.4": {
#                         "name": "messageDigest",
#                         "digest": "NSsMUrfoyCQ0OszPE1YLx1j3EyyCiBmnE5Sua6ghu/Q="
#                       },
#                       "1.2.840.113549.1.9.16.2.47": {
#                         "name": "signingCertificateV2",
#                         "der": "MIGGMIGDMIGABCDB/np5UxvhcPnSxD2Kme+C88uXGCMWLAvFPHNvTApTWDBcMFGkTzBNMQswCQYDVQQGEwJGUjENMAsGA1UEChMERVRTSTEcMBoGA1UECwwTUGx1Z3Rlc3RzXzIwMTMtMjAxNDERMA8GA1UEAxMIUm9vdENBT0sCBwGqRZLTbGE="
#                       }
#                     }
#                   }
#                 ]
#               },
#               "timestampSignatureVerified": true,
#               "tstInfo": {
#                 "tsaPolicyId": "1.3.6.1.4.1.2706.2.2.5.2.1.1.1",
#                 "messageImprint": {
#                   "hashAlg": "sha256",
#                   "digest": "C8xEe9NA4X1cUyHGX9zG89ipmQ2byFs3aa+Xe4Fz2P0=",
#                   "digestMatches": true
#                 },
#                 "serialNumber": "313E162121D922",
#                 "genTime": "20131203065742Z"
#               }
#             }
#           }
#         }
#       ]
#     }
#   }
# }
# 

signingTime = chilkat2.DtObj()

authAttrSigningTimeUtctime = chilkat2.DtObj()

unauthAttrTimestampTokenTstInfoGenTime = chilkat2.DtObj()

# Iterate over the hash algorithms used in the signature.
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

# For each signer...
i = 0
count_i = json.SizeOfArray("pkcs7.verify.signerInfo")
while i < count_i :
    json.I = i

    # Get information about the certificate used by this signer.
    certSerialNumber = json.StringOf("pkcs7.verify.signerInfo[i].cert.serialNumber")
    certIssuerCN = json.StringOf("pkcs7.verify.signerInfo[i].cert.issuerCN")
    certIssuerDN = json.StringOf("pkcs7.verify.signerInfo[i].cert.issuerDN")
    certDigestAlgOid = json.StringOf("pkcs7.verify.signerInfo[i].cert.digestAlgOid")
    certDigestAlgName = json.StringOf("pkcs7.verify.signerInfo[i].cert.digestAlgName")

    # Get additional information for this signer, such as the signingTime, signature algorithm, etc.
    contentType = json.StringOf("pkcs7.verify.signerInfo[i].contentType")
    json.DtOf("pkcs7.verify.signerInfo[i].signingTime",False,signingTime)
    messageDigest = json.StringOf("pkcs7.verify.signerInfo[i].messageDigest")
    signingAlgOid = json.StringOf("pkcs7.verify.signerInfo[i].signingAlgOid")
    signingAlgName = json.StringOf("pkcs7.verify.signerInfo[i].signingAlgName")

    # --------------------------------
    # Examine authenticated attributes.
    # --------------------------------

    # contentType
    if (json.HasMember("pkcs7.verify.signerInfo[i].authAttr.\"1.2.840.113549.1.9.3\"") == True):
        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")

    # signingTime
    if (json.HasMember("pkcs7.verify.signerInfo[i].authAttr.\"1.2.840.113549.1.9.5\"") == True):
        authAttrSigningTimeName = json.StringOf("pkcs7.verify.signerInfo[i].authAttr.\"1.2.840.113549.1.9.5\".name")
        json.DtOf("pkcs7.verify.signerInfo[i].authAttr.\"1.2.840.113549.1.9.5\".utctime",False,authAttrSigningTimeUtctime)

    # messageDigest
    if (json.HasMember("pkcs7.verify.signerInfo[i].authAttr.\"1.2.840.113549.1.9.4\"") == True):
        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")

    # signingCertificateV2
    if (json.HasMember("pkcs7.verify.signerInfo[i].authAttr.\"1.2.840.113549.1.9.16.2.47\"") == True):
        authAttrSigningCertificateV2Name = json.StringOf("pkcs7.verify.signerInfo[i].authAttr.\"1.2.840.113549.1.9.16.2.47\".name")
        authAttrSigningCertificateV2Der = json.StringOf("pkcs7.verify.signerInfo[i].authAttr.\"1.2.840.113549.1.9.16.2.47\".der")

    # --------------------------------
    # Examine unauthenticated attributes.
    # --------------------------------

    # timestampToken  (the timestampToken is what makes this signature a CAdES-T)
    if (json.HasMember("pkcs7.verify.signerInfo[i].unauthAttr.\"1.2.840.113549.1.9.16.2.14\"") == True):

        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")

        # This is where we find out if the timestampToken's signature is valid.
        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")

        # Here is where we check to see if the digest in the timestampToken's messageImprint matches the digest of the signature of this signerInfo
        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")

        # Here is where we get the date/time of the timestampToken (i.e. when it was timestamped)
        json.DtOf("pkcs7.verify.signerInfo[i].unauthAttr.\"1.2.840.113549.1.9.16.2.14\".tstInfo.genTime",False,unauthAttrTimestampTokenTstInfoGenTime)

        # The following code gets details about the validity of the timestampToken's signature...
        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")
            certIssuerDN = json.StringOf("pkcs7.verify.signerInfo[i].unauthAttr.\"1.2.840.113549.1.9.16.2.14\".verify.signerInfo[j].cert.issuerDN")
            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")
            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")
            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")
            authAttrSigningCertificateV2Name = json.StringOf("pkcs7.verify.signerInfo[i].unauthAttr.\"1.2.840.113549.1.9.16.2.14\".verify.signerInfo[j].authAttr.\"1.2.840.113549.1.9.16.2.47\".name")
            authAttrSigningCertificateV2Der = json.StringOf("pkcs7.verify.signerInfo[i].unauthAttr.\"1.2.840.113549.1.9.16.2.14\".verify.signerInfo[j].authAttr.\"1.2.840.113549.1.9.16.2.47\".der")
            j = j + 1

    i = i + 1

if (success != True):
    print(crypt.LastErrorText)
    print("CAdES-T verification failed.")
else:
    print("CAdES-T signature is valid.")


 

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