Initial Code

[brentru]

CircuitPython_RSA is a port of Python-RSA, a pure-Python RSA implementation.

Modifications from initial library.

• The command-line-specific (utils.py) tools have been removed from the library to save space.
• CPython Logging has been replaced with the Adafruit CircuitPython Logger Module.
• Miller–Rabin Primality test algorithm modified to support library's fast_pow, CircuitPython's pow() does not support modular exponentiation.
• adafruit_rsa/tools added, pure-python binascii, warnings, and hashlib modules.

Support for:

• RSA Key pair (private/public) generation
• Message encryption and decryption
• Signature creation and verification
  • w/SHA-256, SHA-384, SHA-512

Examples are provided for signature creation/verification, keypair generation and encryption/decryption, and a unit-test-like for testing future modifications to this library.

[ladyada]

hmm dya want to split hashlib out? i think that would be useful separate rather than embedded?

[brentru]

@ladyada I could split hashlib out - I held off splitting it off since it'll eventually be a core module. Should I also bring binascii out as well so we have pure-python versions of these two modules? TheJWT module, and prob. a lot of future modules currently depends on the hashlib and binascii from this library, for example.

[brentru]

@ladyada Removed the adafruit_rsa/tools/ folder. Hashlib and binascii have been split out into new repositories. Adafruit_RSA has been modified to reflect these changes.

Replaced tools/warnings.py with the circuitpython logger module, instead of warnings.

Updated code successfully passes tests

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Adafruit CircuitPython 4.1.0 on 2019-08-02; Adafruit PyPortal with samd51j20

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code.py output:
Testing: <function test_encrypt_decrypt at 0x20003400>
2314.25: DEBUG - find_p_q(128): Finding p
2316.53: DEBUG - find_p_q(128): Finding q
OK!
Testing: <function test_mod_msg at 0x200033e0>
2317.87: DEBUG - find_p_q(128): Finding p
2318.51: DEBUG - find_p_q(128): Finding q
OK!
Testing: <function test_randomness at 0x200033f0>
2322.82: DEBUG - find_p_q(128): Finding p
2325.37: DEBUG - find_p_q(128): Finding q
OK!
Testing: <function test_sign_verify_sha256 at 0x20003410>
2329.66: DEBUG - find_p_q(248): Finding p
2356.35: DEBUG - find_p_q(248): Finding q
OK!
Testing: <function test_sign_verify_sha384 at 0x20003460>
2376.34: DEBUG - find_p_q(312): Finding p
2449.32: DEBUG - find_p_q(312): Finding q
OK!
Testing: <function test_sign_verify_sha512 at 0x20003510>
2530.8: DEBUG - find_p_q(376): Finding p
2586.87: DEBUG - find_p_q(376): Finding q
OK!
Ran 6 tests in 283.514 seconds