CkPython

Export a Public Key as PEM

Demonstrates the Chilkat PublicKey.GetPem method, which returns the public key in PEM format. The only argument selects the underlying DER representation: true prefers the traditional PKCS #1 form (RSA), false uses the SubjectPublicKeyInfo form.

Note: The file paths are relative to the application's current working directory. Absolute paths may also be used. Supply the paths appropriate to your own environment.

Background: PEM is the most portable way to share a public key — the Base64 text block most tooling reads. The boolean picks the encoding: false produces the modern, algorithm-independent PUBLIC KEY (SubjectPublicKeyInfo), which is the usual choice; true produces the older RSA-specific RSA PUBLIC KEY for tools that require it. A public key is not sensitive, so the PEM can be distributed openly.

Chilkat CkPython Downloads

Download Chilkat for CkPython

CkPython

import sys
import chilkat

success = False

#  Load a public key to export.  LoadFromFile inspects the content, so it accepts DER, PEM, XML,
#  JWK, and other supported representations.
pubKey = chilkat.CkPublicKey()
success = pubKey.LoadFromFile("qa_data/public.pem")
if (success == False):
    print(pubKey.lastErrorText())
    sys.exit()

#  Export the public key in PEM format.  The argument selects the underlying DER representation:
#  True prefers the traditional PKCS #1 form (RSA), False uses the SubjectPublicKeyInfo form.
preferPkcs1 = False
pem = pubKey.getPem(preferPkcs1)
if (pubKey.get_LastMethodSuccess() == False):
    print(pubKey.lastErrorText())
    sys.exit()

print(pem)