(Chilkat2-Python) RSA Sign utf-8 Bytes of String to get Base64 RSA Signature

See more Apple Keychain Examples

Demonstrates how RSA sign the utf-8 byte representation of a string to get the signature in base64 format.

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

import sys
import chilkat2

# Assuming the smartcard/USB token is installed with the correct drivers from the manufacturer,
# this code can work on multiple platforms including Windows, MacOS, Linux, and iOS.

# Chilkat automatically detects and determines the way in which the HSM is used,
# which can be by PKCS11, Apple Keychain, Microsoft CNG / Crypto API, or ScMinidriver.

cert = chilkat2.Cert()

# Set the token/smartcard PIN prior to loading.
cert.SmartCardPin = "123456"

# Specify the certificate by its common name.
success = cert.LoadFromSmartcard("cn=chilkat-rsa-2048")
if (success == False):
    print(cert.LastErrorText)
    sys.exit()

print("Signing with cert: " + cert.SubjectCN)

# Create a string to be hashed and signed.
sb = chilkat2.StringBuilder()
crlfLineEnding = True

for i in range(0,11):
    sb.AppendLine("This is a test.",crlfLineEnding)

rsa = chilkat2.Rsa()

# Use the certificate's private key for signing.
success = rsa.SetX509Cert(cert,True)
if (success == False):
    print(rsa.LastErrorText)
    sys.exit()

# Sign the SHA-256 hash of the utf-8 byte representation of the contents of sb
# Return the signature in base64 format.
rsa.EncodingMode = "base64"
rsa.Charset = "utf-8"
stringToSign = sb.GetAsString()
sigBase64 = rsa.SignStringENC(stringToSign,"sha256")
if (rsa.LastMethodSuccess == False):
    print(rsa.LastErrorText)
    sys.exit()

print("RSA signature as base64: " + sigBase64)