(Chilkat2-Python) RSA Sign using Base64 Private Key

Signs a string using a non-encrypted RSA private key in base64 encoding. Returns the RSA signature as a base64 string.

Note: This example requires Chilkat v11.0.0 or greater.

Chilkat2 Python Downloads install with pip pip3 install chilkat2 or download... Python Module for Windows, Linux, Alpine Linux, MacOS

import sys
import chilkat2

success = False

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

privKey = chilkat2.PrivateKey()

sbPem = chilkat2.StringBuilder()
sbPem.AppendLine("-----BEGIN RSA PRIVATE KEY-----",True)
sbPem.AppendLine("MIIC .... j5A==",True)
sbPem.AppendLine("-----END RSA PRIVATE KEY-----",True)

success = privKey.LoadPem(sbPem.GetAsString())
if (success == False):
    print(privKey.LastErrorText)
    sys.exit()

rsa = chilkat2.Rsa()

success = rsa.UsePrivateKey(privKey)
if (success == False):
    print(rsa.LastErrorText)
    sys.exit()

bd = chilkat2.BinData()
bd.AppendString("12345678","utf-8")

success = rsa.SignRawBd(bd)
if (success == False):
    print(rsa.LastErrorText)
    sys.exit()

# Get the base64 RSA signature.
print(bd.GetEncoded("base64"))

success = rsa.VerifyRawBd(bd)
if (success == False):
    print(rsa.LastErrorText)
    sys.exit()

strOriginal = bd.GetString("utf-8")
print(strOriginal)