Get RSAPublicKey Object from public key string

Author: rusrom

load_public_key_from_string.py

@@ -0,0 +1,19 @@
+from base64 import b64decode
+
+from cryptography.hazmat.backends import default_backend
+from cryptography.hazmat.primitives import serialization
+
+
+public_key_string = 'MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEA3CPXhKOGh6UXbcMD4tJceGVAeNZkdCvwn8ZhVol9+S5zkaEFXxu1nMQQqoHisKhdGowFMqwBbTU7a1yibSEeaiRpSAtLrf9ggedAZHq7UbohaRXaLaqF2xub4WogJMDjts+y+NbgyE31JbNlF0AXjuBc2cQzjeEI8PvbpfE3SGH68jZcKNl9xr0LgIEp0XExtTqBA/NUL1IFfTH7RWr/SZJfMwaB+YL4rDHG0RMQBg6mDwY0Z6NSkdyfxwwEmINJv6oeesAFeomhgsk0iUzbIrqtYwT3zskU+S6hCX65jp/JoxaNXfgn3r7C7wOsExqxq/Bm2nrldDfQ/E9U+mm6OQIDAQAB'
+
+
+# The data between -----BEGIN RSA PUBLIC KEY----- and -----END RSA PUBLIC KEY----- is actually just base-64 encoded DER data.
+der_data = b64decode(public_key_string)
+
+# Return RSAPublicKey object from public key string
+# Deserialize a public key from DER encoded data to one of the supported asymmetric public key types.
+# https://cryptography.io/en/latest/hazmat/primitives/asymmetric/serialization/#cryptography.hazmat.primitives.serialization.load_der_public_key
+public_key_obj = serialization.load_der_public_key(der_data, backend=default_backend())
+
+print(public_key_obj)           # <cryptography.hazmat.backends.openssl.rsa._RSAPublicKey object at 0x000001D107C3A160>
+print(type(public_key_obj))     # <class 'cryptography.hazmat.backends.openssl.rsa._RSAPublicKey'>