(Chilkat2-Python) RSA Sign with PKCS8 Encrypted Key

Demonstrates how to load a private key from an encrypted PKCS8 file and create an RSA digital signature.

Chilkat2 Python Downloads Python Module for Windows, Linux, Alpine Linux, MAC OS X, Solaris, FreeBSD, OpenBSD, Raspberry Pi and other single board computers

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.LoadPkcs8EncryptedFile("privateKey.key","myPassword")

# 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 application or web service is going to be verifying
# 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", "sha256", "sha384", "sha512",  and "md5".
hexSig = rsa.SignStringENC(strData,"sha-1")

print(hexSig)