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(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.

Chilkat Python Downloads

Python Module for Windows, Linux, MAC OS X,
Solaris, FreeBSD, and ARM Embedded Linux

import sys
import chilkat

pkey = chilkat.CkPrivateKey()

#  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 = 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")

#  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.put_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!")

 

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