CkPython Requires Chilkat v11.0.0+
CkPython
Validate CAdES-T Signature (.p7m)
See more CAdES Examples
Validates a CAdES-T CMS signature and extracts the time-stamp token and gets information about it. Also validates the time-stamp token.Chilkat CkPython Downloads
import chilkat
success = False
# This example requires the Chilkat API to have been previously unlocked.
# See Global Unlock Sample for sample code.
crypt = chilkat.CkCrypt2()
# Indicate that the CAdES-T timestamp tokens must also pass validation for the signature to be validated.
cmsOptions = chilkat.CkJsonObject()
cmsOptions.UpdateBool("ValidateTimestampTokens",True)
crypt.put_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 retrieves and parses the last JSON data.
# 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 last JSON data.
# The detailed results of the signature validation are available in the last JSON data.
# (If the non-success return status was caused by an error such as "file not found", then the
# last JSON data would be empty.)
json = chilkat.CkJsonObject()
crypt.GetLastJsonData(json)
json.put_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 = chilkat.CkDtObj()
authAttrSigningTimeUtctime = chilkat.CkDtObj()
unauthAttrTimestampTokenTstInfoGenTime = chilkat.CkDtObj()
# Iterate over the hash algorithms used in the signature.
i = 0
count_i = json.SizeOfArray("pkcs7.verify.digestAlgorithms")
while i < count_i :
json.put_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.put_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.put_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.put_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.")