(CkPython) Duplicate openssl dgst -md5 -sign myKey.pem something.txt | openssl enc -base64 -A

Demonstrates how to duplicate the creation of an RSA signature produced by this OpenSSL command:

openssl dgst -md5 -sign myKey.pem something.txt | openssl enc -base64 -A

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import sys
import chilkat

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

pkey = chilkat.CkPrivateKey()

# Load the private key from an RSA PEM file:
success = pkey.LoadPemFile("myKey.pem")

# Get the private key in XML format:
pkeyXml = pkey.getXml()

rsa = chilkat.CkRsa()

# Import the private key into the RSA component:
success = rsa.ImportPrivateKey(pkeyXml)
if (success != True):
    print(rsa.lastErrorText())
    sys.exit()

# OpenSSL uses BigEndian byte ordering:
rsa.put_LittleEndian(False)

# The resulting signature will be a Base64 string:
rsa.put_EncodingMode("base64")

# For simplicity, we're not loading
# the data to be signed from a file.  We are instead simply
# using a literal string value.  
strData = "This is the text to be signed."

# Hash the input using MD5, and then sign the hash:
# Other valid hash algorithm choices are "md2" and "sha-1".
base64Sig = rsa.signStringENC(strData,"md5")

print(base64Sig)

print("Success!")