Chilkat2-Python

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. Chilkat2-Python

import sys
import chilkat2

success = False

pfx = chilkat2.Pfx()

# 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 = chilkat2.JsonObject()
pfx.GetLastJsonData(json)

json.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.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.Pbes2CryptAlg = "aes256-cbc"
pfx.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.")