(Chilkat2-Python) 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.

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import sys
import chilkat2

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

pkey = chilkat2.PrivateKey()

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

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

rsa = chilkat2.Rsa()

# 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.EncodingMode = "hex"

# If some other non-Chilkat software is going to verify
# the signature, it is important to match the byte-ordering.
# The LittleEndian property may be set to True
# for little-endian byte ordering, 
# or False  for big-endian byte ordering.
# Microsoft apps typically use little-endian, while
# OpenSSL and other services (such as Amazon CloudFront)
# use big-endian.
rsa.LittleEndian = False

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

# Sign the string using the sha-1 hash algorithm.
# Other valid choices are "md2", "md5", "sha256",
# "sha384", and "sha512".
hexSig = rsa.SignStringENC(strData,"sha-1")

print(hexSig)

print("Success!")