(Chilkat2-Python) Apple Keychain - Create RSA Signature

See more Apple Keychain Examples

Using an RSA private key stored in the Apple Keychain, create a signature by signing the SHA-256 hash of the provided string, then return the signature encoded in Base64 format.

Note: This example requires Chilkat v10.0.0 or greater.

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import sys
import chilkat2

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

cert = chilkat2.Cert()

# On MacOS and iOS, the LoadByCommonName function will search the Apple Keychain for the matching certificate.

# A digital certificate's Common Name (CN) is a field in the certificate that specifies the name of the entity the 
# certificate is issued to. It is often used to identify the domain name, hostname, or organization the certificate represents. 

# For example:
# - In an SSL/TLS certificate for a website, the CN typically contains the domain name (e.g., "www.example.com").
# - For certificates representing individuals or organizations, the CN might include the person's name or the organization's name.

# The CN is part of the certificate's Subject field and is crucial for verifying that the certificate corresponds 
# to the intended entity, especially in SSL/TLS communications.

success = cert.LoadByCommonName("Example, Inc.")
if (success == False):
    print(cert.LastErrorText)
    sys.exit()

rsa = chilkat2.Rsa()
success = rsa.SetX509Cert(cert,True)
if (success == False):
    print(rsa.LastErrorText)
    sys.exit()

# Generate an RSA signature by signing the SHA-256 hash of the provided string, 
# then return the signature encoded in Base64 format.
rsa.EncodingMode = "base64"
sigBase64 = rsa.SignStringENC("to be signed","sha256")
if (rsa.LastMethodSuccess == False):
    print(rsa.LastErrorText)
    sys.exit()

print("RSA Signature:")
print(sigBase64)