CkPython Requires Chilkat v11.0.0+
CkPython
Rewrite PFX using AES256-SHA256
See more PFX/P12 Examples
Demonstrates how to load a .pfx/.p12, examine the encryption algorithm used, and rewrite using aes256-sha256.Chilkat CkPython Downloads
import sys
import chilkat
success = False
pfx = chilkat.CkPfx()
# Let's load a .pfx and examine the encryption algorithms used to protect the private key:
success = pfx.LoadPfxFile("qa_data/pfx/test_secret.pfx","secret")
if (success == False):
print(pfx.lastErrorText())
sys.exit()
# Examine the algorithms:
# "pbeWithSHAAnd3_KeyTripleDES_CBC" or "pbes2"?
print("Algorithm: " + pfx.algorithmId())
# If the algorithm is "pbes2" then examine the actual encryption and HMAC algorithms used within pbes2.
# (If the algorithm is NOT "pbes2", then the following properties are meaningless and will not be modified from their previous values prior to loading the PFX.)
print("Pbes2CryptAlg: " + pfx.pbes2CryptAlg())
print("Pbes2HmacAlg: " + pfx.pbes2HmacAlg())
# Our output so far:
# Algorithm: pbeWithSHAAnd3_KeyTripleDES_CBC
# Pbes2CryptAlg: aes256-cbc
# Pbes2HmacAlg: hmacWithSha256
# This tells us that the PFX we loaded was protected using triple-DES with SHA1.
# (Most existing .pfx/.p12 files use 3DES w/ SHA1.)
# The Pbes2CryptAlg and Pbes2HmacAlg properties do not apply here because the AlgorithmId is not equal to "pbes2". We can ignore those values.
# Examine the last JSON data collected in the call to LoadPfxFile. This gives us information about what is contained in the PFX, including extended attributes.
json = chilkat.CkJsonObject()
pfx.GetLastJsonData(json)
json.put_EmitCompact(False)
print(json.emit())
# Sample output
# Use this online tool to generate parsing code from sample JSON:
# Generate Parsing Code from JSON
# {
# "authenticatedSafe": {
# "contentInfo": [
# {
# "type": "Data",
# "safeBag": [
# {
# "type": "pkcs8ShroudedKeyBag",
# "attrs": {
# "localKeyId": "16444216",
# "keyContainerName": "{F09B755A-1E90-444D-9851-02B86CA14961}",
# "msStorageProvider": "Microsoft Enhanced Cryptographic Provider v1.0"
# }
# }
# ]
# },
# {
# "type": "EncryptedData",
# "safeBag": [
# {
# "type": "certBag",
# "attrs": {
# "localKeyId": "16444216"
# },
# "subject": "....",
# "serialNumber": "9999999999999999999999999999"
# },
# {
# "type": "certBag",
# "attrs": {
# "authRootSha256Hash": "0vkOXTXKxNQffUTOZq/4heGBX7M5GFhTqH5mwFyb7x4=",
# "friendlyName": "XYZ",
# "enhKeyUsage": [
# {
# "oid": "1.3.6.1.5.5.7.3.2",
# "usage": "clientAuth"
# },
# {
# "oid": "1.3.6.1.5.5.7.3.4",
# "usage": "emailProtection"
# },
# {
# "oid": "1.3.6.1.5.5.7.3.3",
# "usage": "codeSigning"
# },
# {
# "oid": "1.3.6.1.5.5.7.3.8",
# "usage": "timeStamping"
# },
# {
# "oid": "1.3.6.1.4.1.311.10.3.4",
# "usage": "encryptedFileSystem"
# },
# {
# "oid": "1.3.6.1.5.5.8.2.2",
# "usage": "iKEIntermediate"
# },
#
# {
# "oid": "1.3.6.1.5.5.7.3.6",
# "usage": "ipsecTunnel"
# },
# {
# "oid": "1.3.6.1.5.5.7.3.7",
# "usage": "ipsecUser"
# },
# {
# "oid": "1.3.6.1.5.5.7.3.5",
# "usage": "ipsecEndSystem"
# }
# ]
# },
# "subject": "...",
# "serialNumber": "8888888888888888888888888888"
# },
# {
# "type": "certBag",
# "subject": "...",
# "serialNumber": "777777777777777777777777777"
# }
# ]
# }
# ]
# }
# }
# ------------------------------------------------------------------------------------------
# OK... now let's change the AlgorithmId to "pbes2"
pfx.put_AlgorithmId("pbes2")
# We already know from above that the PBES2 crypt and HMAC algorithms are "aes256-cbc" and "hmacWithSha256".
# Let's set them anyway just for the example...
pfx.put_Pbes2CryptAlg("aes256-cbc")
pfx.put_Pbes2HmacAlg("hmacWithSha256")
# Rewrite the PFX using pbes2/aes256 + sha256
success = pfx.ToFile("secret","qa_output/test_secret_aes256.pfx")
if (success == False):
print(pfx.lastErrorText())
sys.exit()
print("Success.")