Add OpenID Connect Client Flow

[jamesjmeyer210]

Useful Links:

• Signing and validating a JWT using RSA256
• Sign a JWT with RSA256 in C#
• Bearer Token Authentication in C#
• JWT Authentication in Dotnet Core

[jamesjmeyer210]

I'lll need to add a .well-known/jwks.json endpoint as described in this post on Stack Overflow.

[jamesjmeyer210]

I might need to use rsa-openssl-format to import the public/private RSA keys. That crate is desinged to work with the RSA crate.

[jamesjmeyer210]

Functionality I'll need to implement:

• [ ] Decode private key from PEM
• [ ] Decode public key from PEM
• [ ] Get the n (modulus) from the key pair as a Base64Url encoded string
• [ ] Get the e (exponent) from the key pair as a Base64Url encoded string
• [ ] Get the sha1 thumbprint of the x509 cert
• [ ] Provide some kind of test to verify the correctness of the x509 cert