Chilkat2-Python

Sign and Encrypt using Cert to produce -----BEGIN PKCS7----- ... -----END PKCS7-----

Demonstrates how to first sign content using your own cert + private key to produce PKCS7 binary output. Then encrypt the signed binary output using the recipient's public key to produce output such as:

-----BEGIN PKCS7-----
MIIHPwYJKoZIhvcNAQcEoIIHMDCCBywC ...
...
...
-----END PKCS7-----

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Chilkat2-Python

import sys
import chilkat2

success = False

# This example requires the Chilkat API to have been previously unlocked.
# See Global Unlock Sample for sample code.

crypt = chilkat2.Crypt2()

toBeSignedAndEncrypted = "This string is to be signed and then encrypted."

myCert = chilkat2.Cert()
success = myCert.LoadPfxFile("qa_data/pfx/cert_test123.pfx","test123")
if (success != True):
    print(myCert.LastErrorText)
    sys.exit()

success = crypt.SetSigningCert(myCert)
if (success != True):
    print(crypt.LastErrorText)
    sys.exit()

# Get the PKCS7 output in base64 format.
crypt.EncodingMode = "base64"
# Perhaps we don't want the entire cert chain to be included in the signature?
crypt.IncludeCertChain = False
signedPkcs7 = crypt.OpaqueSignStringENC(toBeSignedAndEncrypted)

# We're going to encrypt the binary PKCS7 signature (which contains the content)
bdPkcs7 = chilkat2.BinData()
bdPkcs7.AppendEncoded(signedPkcs7,"base64")

# ---------------------------------------------------
# Now for the encryption...

# Specify the encryption to be used.
# "pki" indicates "Public Key Infrastructure" and will create a PKCS7 encrypted (enveloped) message.
crypt.CryptAlgorithm = "pki"
crypt.Pkcs7CryptAlg = "aes"
crypt.KeyLength = 128
crypt.OaepHash = "sha256"
crypt.OaepPadding = True

# A certificate is needed as the encryption key..
cert = chilkat2.Cert()
success = cert.LoadFromFile("qa_data/certs/testCert.pem")
if (success != True):
    print(cert.LastErrorText)
    sys.exit()

# Tell the crypt object to use the certificate.
crypt.SetEncryptCert(cert)

success = crypt.EncryptBd(bdPkcs7)
if (success != True):
    print(crypt.LastErrorText)
    sys.exit()

# Make a "-----BEGIN PKCS7-----" ... "-----END PKCS7-----" sandwich...
sb = chilkat2.StringBuilder()
sb.AppendLine("-----BEGIN PKCS7-----",True)
sb.Append(bdPkcs7.GetEncoded("base64_mime"))
sb.AppendLine("-----END PKCS7-----",True)

outStr = sb.GetAsString()

print(outStr)

# Sample output:

# -----BEGIN PKCS7-----
# MIIMFQYJKoZIhvcNAQcDoIIMBjCCDAICAQAxggH5MIIB9QIBADCBsTCBmzELMAkGA1UEBhMCR0Ix
# GzAZBgNVBAgTEkdyZWF0ZXIgTWFuY2hlc3RlcjEQMA4GA1UEBxMHU2FsZm9yZDEaMBgGA1UEChMR
# Q09NT0RPIENBIExpbWl0ZWQxQTA/BgNVBAMTOENPTU9ETyBTSEEtMjU2IENsaWVudCBBdXRoZW50
# aWNhdGlvbiBhbmQgU2VjdXJlIEVtYWlsIENBAhEAuBl4qE2MODB05C5h53M5UDA4BgkqhkiG9w0B
# AQcwK6APMA0GCWCGSAFlAwQCAQUAoRgwFgYJKoZIhvcNAQEIMAkGBSsOAwIaBQAEggEAA34hkvxY
# TXMUAsWBmnRIvfFK920WeUVenM4ob7qibDiaXI2qWBgzkIfQH2T1vIYHHzNQuaaiTrK3THn8Nzfy
# RFqTnhfWwsIL/yinHVn5rA9CbHFmxqHr2UctZxLB7x/DxV7pjqpTTveCwgC9FykxGBcNO92Thlho
# bHyq1VM+tm4ppkyV982xL1VAIUX6BvqRlfPsB3hJsdGz/Z3HBdLNgkp2z8mMcLZx9vXwZ3Nyrsi1
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# 2qdwHv7dkngFg3CAggnQiMpHuoyOxSilO2lowI73vwX44PKKu1aGFW+mCbne/UZfOAgbvpHQ1LcP
# Nam+I8MZRtT7nqN3ZWIIvW468z2Z8ne4DqO/D0adlSwE66Z2JxkZncrUM+QR1Oo9sz7aY0eUxzeB
# 5yTUcm3gZSFsKJ0czKzxF7r8IE2ytRVjYWbSZ4eGcJ9Pjpxk38+IZTkcWyzreOCSE9NvH+mefJHT
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# 2DawyL7/konWins6Jo3gYhRgw4fpck14aaEF5/+h3FvgVw23FieWYc6AImn/2zvtv6+gCJl7YnrG
# 9zSjHx2Kf7WRiFbpSqYXGGA0iD0b7So9oyrTItepIRQh0OFcDhCGXvhl2Sb7IQM7sL3WvbAHcseS
# 0xJiEIZogWbVKL5OqAn/VrJsL+0atvkh6qy5FVmk9CBWh92lkmwWyk8+CoTVC6DPMRXLv/MQar2W
# j0cOL12vohVJe9MSHTMR6kHaaxj1J8b5AswZTBsbgFo16Q6ihxLC1fd70OM1c6Hak341UgCxHsOr
# j9JfT+r5jpK3booIzBorGNJOkAuaBAEKdcnNpyCP2sDCzG+7Ws1H+lJzXVDXARftZSbMvfLctU49
# 5YZl+bBifBF8fSSSRNKXMbPeyww1idjezWKiXQC3hA6VPKtW7rn1py7hTlkdm6os1jW9vmSmz30j
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# KrqG2vK4AeBuro1IfoUG1EJ17Q==
# -----END PKCS7-----