pkcs1 crate has no examples, no obvious way of using

[kornelski]

The docs for pkcs1 have no examples how to use the crate to decode an RsaPrivateKey.

The crate has a DecodeRsaPrivateKey trait, but pkcs1::RsaPrivateKey does not implement it? (or if it does, then only indirectly via a blanket impl on a pkcs8 feature in another crate???)

This seems very weird. Is that a mistake? Why is the type and trait in the same crate if they don't work together?

The only apparent way of creating pkcs1::RsaPrivateKey is via TryFrom<&[u8]> implementation, which is not mentioned anywhere, and the impl itself has zero documentation, so it needs diving into the crate's source code to discover it takes DER.

It's weird that the pkcs1 crate has a pem Cargo feature, and describes possibility of using PEM format, but as far as I can tell, PEM decoding is not supported by the crate.

[kornelski]

The actual working implementation of pkcs1::DecodeRsaPrivateKey is not in this crate, only in the rsa crate, and rsa::RsaPrivateKey is a different type than pkcs1::RsaPrivateKey! In the pkcs8 crate, the equivalent of RsaPrivateKey is called PrivateKeyInfo.