CkPython Requires Chilkat v11.0.0+
CkPython
RFC3161 Timestamp Client - Fetch from Timestamp Authority (TSA) and Verify
See more HTTP Examples
Sends an RFC 3161 timestamp request to a TSA (Timestamp Authority) server and validates the timestamp token response.Chilkat CkPython Downloads
import sys
import chilkat
success = False
# This requires the Chilkat API to have been previously unlocked.
# See Global Unlock Sample for sample code.
# First sha-256 hash the data that is to be timestamped.
# In this example, the data is the string "Hello World"
crypt = chilkat.CkCrypt2()
crypt.put_HashAlgorithm("sha256")
crypt.put_EncodingMode("base64")
base64Hash = crypt.hashStringENC("Hello World")
http = chilkat.CkHttp()
requestToken = chilkat.CkBinData()
optionalPolicyOid = ""
addNonce = False
requestTsaCert = True
# Create a time-stamp request token
success = http.CreateTimestampRequest("sha256",base64Hash,optionalPolicyOid,addNonce,requestTsaCert,requestToken)
if (success == False):
print(http.lastErrorText())
sys.exit()
# Send the time-stamp request token to the TSA.
# This is the equivalent of the following CURL command:
# curl -H "Content-Type: application/timestamp-query" --data-binary '@file.tsq' https://freetsa.org/tsr > file.tsr
tsaUrl = "https://freetsa.org/tsr"
# Another timestamp server you could try is: http://timestamp.digicert.com
tsaUrl = "http://timestamp.digicert.com"
resp = chilkat.CkHttpResponse()
success = http.HttpBd("POST",tsaUrl,requestToken,"application/timestamp-query",resp)
if (success == False):
print(http.lastErrorText())
sys.exit()
# Get the timestamp reply from the HTTP response object.
timestampReply = chilkat.CkBinData()
resp.GetBodyBd(timestampReply)
# Show the base64 encoded timestamp reply.
print(timestampReply.getEncoded("base64"))
# Let's verify the timestamp reply against the TSA's cert, which we've previously downloaded.
# See https://freetsa.org/index_en.php
tsaCert = chilkat.CkCert()
success = tsaCert.LoadFromFile("qa_data/certs/freetsa.org.cer")
if (success == False):
print(tsaCert.lastErrorText())
sys.exit()
# The VerifyTimestampReply method will return one of the following values:
# -1: The timestampReply does not contain a valid timestamp reply.
# -2: The timestampReply is a valid timestamp reply, but failed verification using the public key of the tsaCert.
# 0: Granted and verified.
# 1: Granted and verified, with mods (see RFC 3161)
# 2: Rejected.
# 3: Waiting.
# 4: Revocation Warning
# 5: Revocation Notification
pkiStatus = http.VerifyTimestampReply(timestampReply,tsaCert)
if (pkiStatus < 0):
print(http.lastErrorText())
sys.exit()
print("pkiStatus = " + str(pkiStatus))
json = chilkat.CkJsonObject()
http.GetLastJsonData(json)
json.put_EmitCompact(False)
print(json.emit())
# The JSON looks like the following.
# Use this online tool to generate parsing code from sample JSON:
# Generate Parsing Code from JSON
# {
# "timestampReply": {
# "pkiStatus": {
# "value": 0,
# "meaning": "granted"
# }
# },
# "pkcs7": {
# "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": "200405023019Z",
# "messageDigest": "f14zOsdnN9vyyV3HjjBiLzNDi1PF28hAFMODxNkNRZs=",
# "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": "200405023019Z"
# },
# "1.2.840.113549.1.9.16.2.12": {
# "name": "signingCertificate",
# "der": "MBowGDAWBBQDJb1QXtqWMC3CL0+gHkwovig0xQ=="
# },
# "1.2.840.113549.1.9.4": {
# "name": "messageDigest",
# "digest": "f14zOsdnN9vyyV3HjjBiLzNDi1PF28hAFMODxNkNRZs="
# }
# }
# }
# ]
# }
# }
# }
signingTime = chilkat.CkDtObj()
authAttrSigningTimeUtctime = chilkat.CkDtObj()
timestampReplyPkiStatusValue = json.IntOf("timestampReply.pkiStatus.value")
timestampReplyPkiStatusMeaning = json.stringOf("timestampReply.pkiStatus.meaning")
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
i = 0
count_i = json.SizeOfArray("pkcs7.verify.signerInfo")
while i < count_i :
json.put_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")
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")
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")
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)
authAttrSigningCertificateName = json.stringOf("pkcs7.verify.signerInfo[i].authAttr.\"1.2.840.113549.1.9.16.2.12\".name")
authAttrSigningCertificateDer = json.stringOf("pkcs7.verify.signerInfo[i].authAttr.\"1.2.840.113549.1.9.16.2.12\".der")
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")
i = i + 1