Create PKCS1 RSA Signature with PEM Private Key

Demonstrates how to load a private key from a PEM file and create a PKCS1 RSA digital signature.

Download Chilkat Python Library

import sys
import chilkat

pkey = chilkat.CkPrivateKey()

#  Load the private key from an RSA PEM file:
pkey.LoadPemFile("pvkey2_rsa.pem")

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

rsa = chilkat.CkRsa()

#  Any string argument automatically begins the 30-day trial.
success = rsa.UnlockComponent("30-day trial")
if (success != True):
    print "RSA component unlock failed"
    sys.exit()

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

#  This example will sign a string, and receive the signature
#  in a hex-encoded string.  Therefore, set the encoding mode
#  to "hex":
rsa.put_EncodingMode("hex")

strData = "This is the string to be signed."

#  Sign the string using the sha-1 hash algorithm.
#  Other valid choices are "md2" and "md5".
hexSig = rsa.signStringENC(strData,"sha-1")

print hexSig

print "Success!"