(Tcl) RFC3161 Timestamp Client - Fetch from Timestamp Authority (TSA) and Verify

Sends an RFC 3161 timestamp request to a TSA (Timestamp Authority) server and validates the timestamp token response.

Note: This example requires Chilkat v9.5.0.75 or greater.

Chilkat Tcl Extension Downloads Chilkat Tcl Extension Downloads

load ./chilkat.dll

# Note: Requires Chilkat v9.5.0.75 or greater.

# 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"

set crypt [new_CkCrypt2]

CkCrypt2_put_HashAlgorithm $crypt "sha256"
CkCrypt2_put_EncodingMode $crypt "base64"
set base64Hash [CkCrypt2_hashStringENC $crypt "Hello World"]

set http [new_CkHttp]

set requestToken [new_CkBinData]

set optionalPolicyOid ""
set addNonce 0
set requestTsaCert 1

# Create a time-stamp request token
set success [CkHttp_CreateTimestampRequest $http "sha256" $base64Hash $optionalPolicyOid $addNonce $requestTsaCert $requestToken]
if {$success != 1} then {
    puts [CkHttp_lastErrorText $http]
    delete_CkCrypt2 $crypt
    delete_CkHttp $http
    delete_CkBinData $requestToken
    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
set tsaUrl "https://freetsa.org/tsr"
# Another timestamp server you could try is: http://timestamp.digicert.com
set tsaUrl "http://timestamp.digicert.com"
# resp is a CkHttpResponse
set resp [CkHttp_PBinaryBd $http "POST" $tsaUrl $requestToken "application/timestamp-query" 0 0]
if {[CkHttp_get_LastMethodSuccess $http] != 1} then {
    puts [CkHttp_lastErrorText $http]
    delete_CkCrypt2 $crypt
    delete_CkHttp $http
    delete_CkBinData $requestToken
    exit
}

# Get the timestamp reply from the HTTP response object.
set timestampReply [new_CkBinData]

CkHttpResponse_GetBodyBd $resp $timestampReply
delete_CkHttpResponse $resp

# Show the base64 encoded timestamp reply.
puts [CkBinData_getEncoded $timestampReply base64]

# Let's verify the timestamp reply against the TSA's cert, which we've previously downloaded.
# See https://freetsa.org/index_en.php
set tsaCert [new_CkCert]

set success [CkCert_LoadFromFile $tsaCert "qa_data/certs/freetsa.org.cer"]
if {$success != 1} then {
    puts [CkCert_lastErrorText $tsaCert]
    delete_CkCrypt2 $crypt
    delete_CkHttp $http
    delete_CkBinData $requestToken
    delete_CkBinData $timestampReply
    delete_CkCert $tsaCert
    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
set pkiStatus [CkHttp_VerifyTimestampReply $http $timestampReply $tsaCert]
if {$pkiStatus < 0} then {
    puts [CkHttp_lastErrorText $http]
    delete_CkCrypt2 $crypt
    delete_CkHttp $http
    delete_CkBinData $requestToken
    delete_CkBinData $timestampReply
    delete_CkCert $tsaCert
    exit
}

puts "pkiStatus = $pkiStatus"

# json is a CkJsonObject
set json [CkHttp_LastJsonData $http]
CkJsonObject_put_EmitCompact $json 0
puts [CkJsonObject_emit $json]

# The LastJsonData looks like the following.
# Note: The "timestampReply.pkiStatus" portion of the LastJsonData was added in Chilkat v9.5.0.83

# 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="
#             }
#           }
#         }
#       ]
#     }
#   }
# }

set signingTime [new_CkDtObj]

set authAttrSigningTimeUtctime [new_CkDtObj]

set timestampReplyPkiStatusValue [CkJsonObject_IntOf $json "timestampReply.pkiStatus.value"]
set timestampReplyPkiStatusMeaning [CkJsonObject_stringOf $json "timestampReply.pkiStatus.meaning"]
set i 0
set count_i [CkJsonObject_SizeOfArray $json "pkcs7.verify.digestAlgorithms"]
while {$i < $count_i} {
    CkJsonObject_put_I $json $i
    set strVal [CkJsonObject_stringOf $json "pkcs7.verify.digestAlgorithms[i]"]
    set i [expr $i + 1]
}
set i 0
set count_i [CkJsonObject_SizeOfArray $json "pkcs7.verify.signerInfo"]
while {$i < $count_i} {
    CkJsonObject_put_I $json $i
    set certSerialNumber [CkJsonObject_stringOf $json "pkcs7.verify.signerInfo[i].cert.serialNumber"]
    set certIssuerCN [CkJsonObject_stringOf $json "pkcs7.verify.signerInfo[i].cert.issuerCN"]
    set certDigestAlgOid [CkJsonObject_stringOf $json "pkcs7.verify.signerInfo[i].cert.digestAlgOid"]
    set certDigestAlgName [CkJsonObject_stringOf $json "pkcs7.verify.signerInfo[i].cert.digestAlgName"]
    set contentType [CkJsonObject_stringOf $json "pkcs7.verify.signerInfo[i].contentType"]
    CkJsonObject_DtOf $json "pkcs7.verify.signerInfo[i].signingTime" 0 $signingTime
    set messageDigest [CkJsonObject_stringOf $json "pkcs7.verify.signerInfo[i].messageDigest"]
    set signingAlgOid [CkJsonObject_stringOf $json "pkcs7.verify.signerInfo[i].signingAlgOid"]
    set signingAlgName [CkJsonObject_stringOf $json "pkcs7.verify.signerInfo[i].signingAlgName"]
    set authAttrContentTypeName [CkJsonObject_stringOf $json "pkcs7.verify.signerInfo[i].authAttr.\"1.2.840.113549.1.9.3\".name"]
    set authAttrContentTypeOid [CkJsonObject_stringOf $json "pkcs7.verify.signerInfo[i].authAttr.\"1.2.840.113549.1.9.3\".oid"]
    set authAttrSigningTimeName [CkJsonObject_stringOf $json "pkcs7.verify.signerInfo[i].authAttr.\"1.2.840.113549.1.9.5\".name"]
    CkJsonObject_DtOf $json "pkcs7.verify.signerInfo[i].authAttr.\"1.2.840.113549.1.9.5\".utctime" 0 $authAttrSigningTimeUtctime
    set authAttrSigningCertificateName [CkJsonObject_stringOf $json "pkcs7.verify.signerInfo[i].authAttr.\"1.2.840.113549.1.9.16.2.12\".name"]
    set authAttrSigningCertificateDer [CkJsonObject_stringOf $json "pkcs7.verify.signerInfo[i].authAttr.\"1.2.840.113549.1.9.16.2.12\".der"]
    set authAttrMessageDigestName [CkJsonObject_stringOf $json "pkcs7.verify.signerInfo[i].authAttr.\"1.2.840.113549.1.9.4\".name"]
    set authAttrMessageDigestDigest [CkJsonObject_stringOf $json "pkcs7.verify.signerInfo[i].authAttr.\"1.2.840.113549.1.9.4\".digest"]
    set i [expr $i + 1]
}

delete_CkJsonObject $json


delete_CkCrypt2 $crypt
delete_CkHttp $http
delete_CkBinData $requestToken
delete_CkBinData $timestampReply
delete_CkCert $tsaCert
delete_CkDtObj $signingTime
delete_CkDtObj $authAttrSigningTimeUtctime