CkPython

Get a Certificate's Key Size

See more Certificates Examples

Demonstrates how to get the RSA key size of a certificate (for example, 1024-bit, 2048-bit, etc.) CkPython

import sys
import chilkat

success = False

# For this example, I have a certificate in raw base64 format (not PEM),
# that looks like this:  "MIIGkDCCBHigAwIBAgIUMDA ... s/iqLsLA=="
sbCertBase64 = chilkat.CkStringBuilder()
success = sbCertBase64.LoadFile("qa_data/certs/base64Cert.txt","utf-8")

cert = chilkat.CkCert()
success = cert.LoadFromBase64(sbCertBase64.getAsString())
if (success == False):
    print(cert.lastErrorText())
    sys.exit()

# Get the public key.
pubKey = chilkat.CkPublicKey()
cert.GetPublicKey(pubKey)

numBits = pubKey.get_KeySize()
print("Number of bits = " + str(numBits))

# If using an older version of Chilkat, the key size can be obtained like this:
xml = chilkat.CkXml()
xml.LoadXml(pubKey.getXml())

binDat = chilkat.CkBinData()
binDat.AppendEncoded(xml.getChildContent("Modulus"),"base64")

numBits = 8 * binDat.get_NumBytes()
print("Number of bits = " + str(numBits))