Merge pull request #41 from FoamyGuy/json_key_file_example

json key file example

examples/keys/example512key.json

@@ -0,0 +1 @@
+{"private_key_arguments": [10802924268999465233003672463737659932191279041133968058923436754367015686828567560383989892160402220695228233889545658683964318629332408693761505895756447, 65537, 6603041646208715356266858592129685239844946455128316714288951729655521528037145487273616012885516521612688207348765184497451491506274914199323595424930097, 112900874195215049358818352411672948770646187545424444301451131703364915854523, 95685036506628869041897601422905615595924763394819122702857010830658994689389]}

examples/keys/example512key.json.license

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+# SPDX-FileCopyrightText: 2024 Tim Cocks
+# SPDX-License-Identifier: MIT

examples/keys/example512key_pub.json

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+{"public_key_arguments": [10802924268999465233003672463737659932191279041133968058923436754367015686828567560383989892160402220695228233889545658683964318629332408693761505895756447, 65537]}

examples/keys/example512key_pub.json.license

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+# SPDX-FileCopyrightText: 2024 Tim Cocks
+# SPDX-License-Identifier: MIT

examples/rsa_json_keys.py

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+# SPDX-FileCopyrightText: 2024 Tim Cocks
+# SPDX-License-Identifier: MIT
+import binascii
+import json
+import adafruit_rsa
+from adafruit_rsa import PublicKey, PrivateKey
+
+"""
+CircuitPython microcontrollers cannot load PEM key files generated by OpenSSL
+because the pyasn1 module is not supported. This example illustrates a way
+of loading keys from JSON files instead.
+"""
+
+# load a keypair from JSON files
+
+with open("keys/example512key.json", "r") as f:
+    priv_key_obj = json.loads(f.read())
+
+
+with open("keys/example512key_pub.json", "r") as f:
+    pub_key_obj = json.loads(f.read())
+
+
+# initialize the Key objects from data that was loaded from the JSON files
+public_key = PublicKey(*pub_key_obj["public_key_arguments"])
+private_key = PrivateKey(*priv_key_obj["private_key_arguments"])
+
+# Message to send
+message = "hello blinka"
+
+# Encode the string as bytes (Adafruit_RSA only operates on bytes!)
+message = message.encode("utf-8")
+
+# Encrypt the message using the public key
+print("Encrypting message...")
+encrypted_message = adafruit_rsa.encrypt(message, public_key)
+
+print("encrypted b64: ")
+print(binascii.b2a_base64(encrypted_message, False).decode())
+
+# Decrypt the encrypted message using a private key
+print("Decrypting message...")
+decrypted_message = adafruit_rsa.decrypt(encrypted_message, private_key)
+
+# Print out the decrypted message
+print("Decrypted Message: ", decrypted_message.decode("utf-8"))