(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.

Chilkat Python Downloads install with pip pip3 install chilkat or download... Python Module for Windows, MacOS, Linux, Alpine Linux, Solaris

import sys
import chilkat

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

privKey = chilkat.CkPrivateKey()

sbPem = chilkat.CkStringBuilder()
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 != True):
    print(privKey.lastErrorText())
    sys.exit()

rsa = chilkat.CkRsa()

success = rsa.ImportPrivateKeyObj(privKey)
if (success != True):
    print(rsa.lastErrorText())
    sys.exit()

rsa.put_EncodingMode("base64")
strSigned = rsa.openSslSignStringENC("12345678")
print(strSigned)

strOriginal = rsa.openSslVerifyStringENC(strSigned)
print(strOriginal)