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digest: type name readability regression #1069

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tarcieri opened this issue Aug 2, 2022 · 11 comments · May be fixed by #1799
Open

digest: type name readability regression #1069

tarcieri opened this issue Aug 2, 2022 · 11 comments · May be fixed by #1799
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digest Hash function crate

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@tarcieri
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tarcieri commented Aug 2, 2022 •
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Digest now makes use of several vaguely-named generic wrapper structs and type aliases to give them human-readable names.

This makes both the type names emitted by rustc and the resulting rustdoc harder to read, as they render the canonical type name rather than the type alias.

For example, what used to render in rustdoc as:

impl PrehashSignature for Signature {
    type Digest = Sha256;
}

now renders as:

impl PrehashSignature for Signature {
    type Digest = CoreWrapper<CtVariableCoreWrapper<Sha256VarCore, UInt<UInt<UInt<UInt<UInt<UInt<UTerm, B1>, B0>, B0>, B0>, B0>, B0>>>
}

e.g. https://docs.rs/k256/0.11.3/k256/schnorr/struct.Signature.html#impl-PrehashSignature

I think this usability issue and various others (e.g. confusing error messages relating to blanket impls of sealed traits) could be fixed by using newtypes around the generic core, rather than just type aliases.
@newpavlov
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could be fixed by using newtypes around the generic core, rather than just type aliases.

It will involve a quite significant amount of boilerplate in every hash crate.

@tarcieri
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I think with some experimentation we can find a solution which allows newtypes for each hash type while minimizing per-crate boilerplate.

@tarcieri
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Alternatively perhaps we could find more meaningful names for the generic types which make the generic types more readable.

Or a combination thereof.

@tarcieri tarcieri mentioned this issue Sep 5, 2022
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@tarcieri
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tarcieri commented Sep 7, 2022

In RustCrypto/RSA#179 we ran into a somewhat related issue:

It would be nice to be able to use the const_oid::AssociatedOid trait to associate an OID with types like Sha224/Sha256/Sha384/Sha512.

Unfortunately this isn't possible because these types are actually CoreWrapper<CtVariableCoreWrapper<...> as defined by the digest crate.

Something I think is worth noting is the orphan rules would probably permit such an impl if the inner generic type were defined in the current crate (leveraging the same exemption From uses), but that doesn't work with multiple layers of generics like this.

@newpavlov
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I think digest can implement AssociatedOid for the wrappers if a wrapped type implements it. In other words, we would implement AssociatedOid for core types and digest will handle "bubbling" it to the types used by users.

@newpavlov newpavlov mentioned this issue Sep 7, 2022
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@newpavlov
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Potentially relevant issue: rust-lang/rust#66751

@tarcieri
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tarcieri commented Sep 7, 2022 •
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Re: newtypes, using macros for delegation is one option as mentioned here: #1098 (comment)

FWIW I don't think it's a terrible option. Macros are best used as stopgaps for missing language features, and I think the lack of first-class delegation support (especially in a composition-over-inheritance language) is a reasonable use case for macros. I also think lack of first-class delegation is somewhat widely recognized as a deficiency in Rust which should eventually get addressed somehow. See rust-lang/rfcs#2393

We use them for solving a similar problem related to AssociatedOid here: https://docs.rs/x509-cert/latest/x509_cert/macro.impl_newtype.html

Alternatively Deref could be used, potentially in combination with macros.

@newpavlov newpavlov added the digest Hash function crate label Sep 15, 2022
@tarcieri
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Along these same lines, the error messages for when a digest type fails to impl the #1098 approach to AssociatedOid makes for a fairly inscrutable error message:

error[E0599]: the function or associated item `new_with_prefix` exists for struct `rsa::pkcs1v15::SigningKey<CoreWrapper<CtVariableCoreWrapper<Sha512VarCore, signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<UTerm, B1>, B0>, B0>, B0>, B0>, B0>, B0>, OidSha512>>>`, but its trait bounds were not satisfied
   --> ssh-key/src/signature.rs:403:52
    |
403 |         let data = pkcs1v15::SigningKey::<Sha512>::new_with_prefix(self)
    |                                                    ^^^^^^^^^^^^^^^ function or associated item cannot be called on `rsa::pkcs1v15::SigningKey<CoreWrapper<CtVariableCoreWrapper<Sha512VarCore, signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<UTerm, B1>, B0>, B0>, B0>, B0>, B0>, B0>, OidSha512>>>` due to unsatisfied trait bounds
    |
   ::: /Users/bascule/.cargo/registry/src/github.com-1ecc6299db9ec823/rsa-0.7.0-rc.0/src/pkcs1v15.rs:306:1
    |
306 | pub struct SigningKey<D>
    | ------------------------
    | |
    | doesn't satisfy `_: Default`
    | doesn't satisfy `_: FixedOutput`
    | doesn't satisfy `_: HashMarker`
    | doesn't satisfy `_: Update`
    | doesn't satisfy `_: sha2::Digest`
    |
   ::: /Users/bascule/.cargo/registry/src/github.com-1ecc6299db9ec823/digest-0.10.5/src/core_api/wrapper.rs:24:1
    |
24  | pub struct CoreWrapper<T>
    | ------------------------- doesn't satisfy `_: AssociatedOid`
    |
    = note: the following trait bounds were not satisfied:
            `CoreWrapper<CtVariableCoreWrapper<Sha512VarCore, signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<UTerm, B1>, B0>, B0>, B0>, B0>, B0>, B0>, OidSha512>>: AssociatedOid`

...and for me this error continues (possibly unrelated):

            `rsa::pkcs1v15::SigningKey<CoreWrapper<CtVariableCoreWrapper<Sha512VarCore, signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<UTerm, B1>, B0>, B0>, B0>, B0>, B0>, B0>, OidSha512>>>: FixedOutput`
            which is required by `rsa::pkcs1v15::SigningKey<CoreWrapper<CtVariableCoreWrapper<Sha512VarCore, signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<UTerm, B1>, B0>, B0>, B0>, B0>, B0>, B0>, OidSha512>>>: sha2::Digest`
            `rsa::pkcs1v15::SigningKey<CoreWrapper<CtVariableCoreWrapper<Sha512VarCore, signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<UTerm, B1>, B0>, B0>, B0>, B0>, B0>, B0>, OidSha512>>>: Default`
            which is required by `rsa::pkcs1v15::SigningKey<CoreWrapper<CtVariableCoreWrapper<Sha512VarCore, signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<UTerm, B1>, B0>, B0>, B0>, B0>, B0>, B0>, OidSha512>>>: sha2::Digest`
            `rsa::pkcs1v15::SigningKey<CoreWrapper<CtVariableCoreWrapper<Sha512VarCore, signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<UTerm, B1>, B0>, B0>, B0>, B0>, B0>, B0>, OidSha512>>>: Update`
            which is required by `rsa::pkcs1v15::SigningKey<CoreWrapper<CtVariableCoreWrapper<Sha512VarCore, signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<UTerm, B1>, B0>, B0>, B0>, B0>, B0>, B0>, OidSha512>>>: sha2::Digest`
            `rsa::pkcs1v15::SigningKey<CoreWrapper<CtVariableCoreWrapper<Sha512VarCore, signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<UTerm, B1>, B0>, B0>, B0>, B0>, B0>, B0>, OidSha512>>>: HashMarker`
            which is required by `rsa::pkcs1v15::SigningKey<CoreWrapper<CtVariableCoreWrapper<Sha512VarCore, signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<UTerm, B1>, B0>, B0>, B0>, B0>, B0>, B0>, OidSha512>>>: sha2::Digest`
            `&rsa::pkcs1v15::SigningKey<CoreWrapper<CtVariableCoreWrapper<Sha512VarCore, signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<UTerm, B1>, B0>, B0>, B0>, B0>, B0>, B0>, OidSha512>>>: FixedOutput`
            which is required by `&rsa::pkcs1v15::SigningKey<CoreWrapper<CtVariableCoreWrapper<Sha512VarCore, signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<UTerm, B1>, B0>, B0>, B0>, B0>, B0>, B0>, OidSha512>>>: sha2::Digest`
            `&rsa::pkcs1v15::SigningKey<CoreWrapper<CtVariableCoreWrapper<Sha512VarCore, signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<UTerm, B1>, B0>, B0>, B0>, B0>, B0>, B0>, OidSha512>>>: Default`
            which is required by `&rsa::pkcs1v15::SigningKey<CoreWrapper<CtVariableCoreWrapper<Sha512VarCore, signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<UTerm, B1>, B0>, B0>, B0>, B0>, B0>, B0>, OidSha512>>>: sha2::Digest`
            `&rsa::pkcs1v15::SigningKey<CoreWrapper<CtVariableCoreWrapper<Sha512VarCore, signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<UTerm, B1>, B0>, B0>, B0>, B0>, B0>, B0>, OidSha512>>>: Update`
            which is required by `&rsa::pkcs1v15::SigningKey<CoreWrapper<CtVariableCoreWrapper<Sha512VarCore, signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<UTerm, B1>, B0>, B0>, B0>, B0>, B0>, B0>, OidSha512>>>: sha2::Digest`
            `&rsa::pkcs1v15::SigningKey<CoreWrapper<CtVariableCoreWrapper<Sha512VarCore, signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<UTerm, B1>, B0>, B0>, B0>, B0>, B0>, B0>, OidSha512>>>: HashMarker`
            which is required by `&rsa::pkcs1v15::SigningKey<CoreWrapper<CtVariableCoreWrapper<Sha512VarCore, signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<UTerm, B1>, B0>, B0>, B0>, B0>, B0>, B0>, OidSha512>>>: sha2::Digest`
            `&mut rsa::pkcs1v15::SigningKey<CoreWrapper<CtVariableCoreWrapper<Sha512VarCore, signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<UTerm, B1>, B0>, B0>, B0>, B0>, B0>, B0>, OidSha512>>>: FixedOutput`
            which is required by `&mut rsa::pkcs1v15::SigningKey<CoreWrapper<CtVariableCoreWrapper<Sha512VarCore, signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<UTerm, B1>, B0>, B0>, B0>, B0>, B0>, B0>, OidSha512>>>: sha2::Digest`
            `&mut rsa::pkcs1v15::SigningKey<CoreWrapper<CtVariableCoreWrapper<Sha512VarCore, signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<UTerm, B1>, B0>, B0>, B0>, B0>, B0>, B0>, OidSha512>>>: Default`
            which is required by `&mut rsa::pkcs1v15::SigningKey<CoreWrapper<CtVariableCoreWrapper<Sha512VarCore, signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<UTerm, B1>, B0>, B0>, B0>, B0>, B0>, B0>, OidSha512>>>: sha2::Digest`
            `&mut rsa::pkcs1v15::SigningKey<CoreWrapper<CtVariableCoreWrapper<Sha512VarCore, signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<UTerm, B1>, B0>, B0>, B0>, B0>, B0>, B0>, OidSha512>>>: Update`
            which is required by `&mut rsa::pkcs1v15::SigningKey<CoreWrapper<CtVariableCoreWrapper<Sha512VarCore, signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<UTerm, B1>, B0>, B0>, B0>, B0>, B0>, B0>, OidSha512>>>: sha2::Digest`
            `&mut rsa::pkcs1v15::SigningKey<CoreWrapper<CtVariableCoreWrapper<Sha512VarCore, signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<UTerm, B1>, B0>, B0>, B0>, B0>, B0>, B0>, OidSha512>>>: HashMarker`
            which is required by `&mut rsa::pkcs1v15::SigningKey<CoreWrapper<CtVariableCoreWrapper<Sha512VarCore, signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<UTerm, B1>, B0>, B0>, B0>, B0>, B0>, B0>, OidSha512>>>: sha2::Digest`

error[E0599]: the function or associated item `new_with_prefix` exists for struct `rsa::pkcs1v15::VerifyingKey<CoreWrapper<CtVariableCoreWrapper<Sha256VarCore, signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<UTerm, B1>, B0>, B0>, B0>, B0>, B0>, OidSha256>>>`, but its trait bounds were not satisfied
   --> ssh-key/src/signature.rs:427:51
    |
427 |                 pkcs1v15::VerifyingKey::<Sha256>::new_with_prefix(self)
    |                                                   ^^^^^^^^^^^^^^^ function or associated item cannot be called on `rsa::pkcs1v15::VerifyingKey<CoreWrapper<CtVariableCoreWrapper<Sha256VarCore, signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<UTerm, B1>, B0>, B0>, B0>, B0>, B0>, OidSha256>>>` due to unsatisfied trait bounds
    |
   ::: /Users/bascule/.cargo/registry/src/github.com-1ecc6299db9ec823/rsa-0.7.0-rc.0/src/pkcs1v15.rs:406:1
    |
406 | pub struct VerifyingKey<D>
    | --------------------------
    | |
    | doesn't satisfy `_: Default`
    | doesn't satisfy `_: FixedOutput`
    | doesn't satisfy `_: HashMarker`
    | doesn't satisfy `_: Update`
    | doesn't satisfy `_: sha2::Digest`
    |
   ::: /Users/bascule/.cargo/registry/src/github.com-1ecc6299db9ec823/digest-0.10.5/src/core_api/wrapper.rs:24:1
    |
24  | pub struct CoreWrapper<T>
    | ------------------------- doesn't satisfy `_: AssociatedOid`
    |
    = note: the following trait bounds were not satisfied:
            `CoreWrapper<CtVariableCoreWrapper<Sha256VarCore, signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<UTerm, B1>, B0>, B0>, B0>, B0>, B0>, OidSha256>>: AssociatedOid`
            `rsa::pkcs1v15::VerifyingKey<CoreWrapper<CtVariableCoreWrapper<Sha256VarCore, signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<UTerm, B1>, B0>, B0>, B0>, B0>, B0>, OidSha256>>>: FixedOutput`
            which is required by `rsa::pkcs1v15::VerifyingKey<CoreWrapper<CtVariableCoreWrapper<Sha256VarCore, signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<UTerm, B1>, B0>, B0>, B0>, B0>, B0>, OidSha256>>>: sha2::Digest`
            `rsa::pkcs1v15::VerifyingKey<CoreWrapper<CtVariableCoreWrapper<Sha256VarCore, signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<UTerm, B1>, B0>, B0>, B0>, B0>, B0>, OidSha256>>>: Default`
            which is required by `rsa::pkcs1v15::VerifyingKey<CoreWrapper<CtVariableCoreWrapper<Sha256VarCore, signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<UTerm, B1>, B0>, B0>, B0>, B0>, B0>, OidSha256>>>: sha2::Digest`
            `rsa::pkcs1v15::VerifyingKey<CoreWrapper<CtVariableCoreWrapper<Sha256VarCore, signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<UTerm, B1>, B0>, B0>, B0>, B0>, B0>, OidSha256>>>: Update`
            which is required by `rsa::pkcs1v15::VerifyingKey<CoreWrapper<CtVariableCoreWrapper<Sha256VarCore, signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<UTerm, B1>, B0>, B0>, B0>, B0>, B0>, OidSha256>>>: sha2::Digest`
            `rsa::pkcs1v15::VerifyingKey<CoreWrapper<CtVariableCoreWrapper<Sha256VarCore, signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<UTerm, B1>, B0>, B0>, B0>, B0>, B0>, OidSha256>>>: HashMarker`
            which is required by `rsa::pkcs1v15::VerifyingKey<CoreWrapper<CtVariableCoreWrapper<Sha256VarCore, signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<UTerm, B1>, B0>, B0>, B0>, B0>, B0>, OidSha256>>>: sha2::Digest`
            `&rsa::pkcs1v15::VerifyingKey<CoreWrapper<CtVariableCoreWrapper<Sha256VarCore, signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<UTerm, B1>, B0>, B0>, B0>, B0>, B0>, OidSha256>>>: FixedOutput`
            which is required by `&rsa::pkcs1v15::VerifyingKey<CoreWrapper<CtVariableCoreWrapper<Sha256VarCore, signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<UTerm, B1>, B0>, B0>, B0>, B0>, B0>, OidSha256>>>: sha2::Digest`
            `&rsa::pkcs1v15::VerifyingKey<CoreWrapper<CtVariableCoreWrapper<Sha256VarCore, signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<UTerm, B1>, B0>, B0>, B0>, B0>, B0>, OidSha256>>>: Default`
            which is required by `&rsa::pkcs1v15::VerifyingKey<CoreWrapper<CtVariableCoreWrapper<Sha256VarCore, signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<UTerm, B1>, B0>, B0>, B0>, B0>, B0>, OidSha256>>>: sha2::Digest`
            `&rsa::pkcs1v15::VerifyingKey<CoreWrapper<CtVariableCoreWrapper<Sha256VarCore, signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<UTerm, B1>, B0>, B0>, B0>, B0>, B0>, OidSha256>>>: Update`
            which is required by `&rsa::pkcs1v15::VerifyingKey<CoreWrapper<CtVariableCoreWrapper<Sha256VarCore, signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<UTerm, B1>, B0>, B0>, B0>, B0>, B0>, OidSha256>>>: sha2::Digest`
            `&rsa::pkcs1v15::VerifyingKey<CoreWrapper<CtVariableCoreWrapper<Sha256VarCore, signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<UTerm, B1>, B0>, B0>, B0>, B0>, B0>, OidSha256>>>: HashMarker`
            which is required by `&rsa::pkcs1v15::VerifyingKey<CoreWrapper<CtVariableCoreWrapper<Sha256VarCore, signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<UTerm, B1>, B0>, B0>, B0>, B0>, B0>, OidSha256>>>: sha2::Digest`
            `&mut rsa::pkcs1v15::VerifyingKey<CoreWrapper<CtVariableCoreWrapper<Sha256VarCore, signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<UTerm, B1>, B0>, B0>, B0>, B0>, B0>, OidSha256>>>: FixedOutput`
            which is required by `&mut rsa::pkcs1v15::VerifyingKey<CoreWrapper<CtVariableCoreWrapper<Sha256VarCore, signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<UTerm, B1>, B0>, B0>, B0>, B0>, B0>, OidSha256>>>: sha2::Digest`
            `&mut rsa::pkcs1v15::VerifyingKey<CoreWrapper<CtVariableCoreWrapper<Sha256VarCore, signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<UTerm, B1>, B0>, B0>, B0>, B0>, B0>, OidSha256>>>: Default`
            which is required by `&mut rsa::pkcs1v15::VerifyingKey<CoreWrapper<CtVariableCoreWrapper<Sha256VarCore, signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<UTerm, B1>, B0>, B0>, B0>, B0>, B0>, OidSha256>>>: sha2::Digest`
            `&mut rsa::pkcs1v15::VerifyingKey<CoreWrapper<CtVariableCoreWrapper<Sha256VarCore, signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<UTerm, B1>, B0>, B0>, B0>, B0>, B0>, OidSha256>>>: Update`
            which is required by `&mut rsa::pkcs1v15::VerifyingKey<CoreWrapper<CtVariableCoreWrapper<Sha256VarCore, signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<UTerm, B1>, B0>, B0>, B0>, B0>, B0>, OidSha256>>>: sha2::Digest`
            `&mut rsa::pkcs1v15::VerifyingKey<CoreWrapper<CtVariableCoreWrapper<Sha256VarCore, signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<UTerm, B1>, B0>, B0>, B0>, B0>, B0>, OidSha256>>>: HashMarker`
            which is required by `&mut rsa::pkcs1v15::VerifyingKey<CoreWrapper<CtVariableCoreWrapper<Sha256VarCore, signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<UTerm, B1>, B0>, B0>, B0>, B0>, B0>, OidSha256>>>: sha2::Digest`

error[E0599]: the function or associated item `new_with_prefix` exists for struct `rsa::pkcs1v15::VerifyingKey<CoreWrapper<CtVariableCoreWrapper<Sha512VarCore, signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<UTerm, B1>, B0>, B0>, B0>, B0>, B0>, B0>, OidSha512>>>`, but its trait bounds were not satisfied
   --> ssh-key/src/signature.rs:435:51
    |
435 |                 pkcs1v15::VerifyingKey::<Sha512>::new_with_prefix(self)
    |                                                   ^^^^^^^^^^^^^^^ function or associated item cannot be called on `rsa::pkcs1v15::VerifyingKey<CoreWrapper<CtVariableCoreWrapper<Sha512VarCore, signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<UTerm, B1>, B0>, B0>, B0>, B0>, B0>, B0>, OidSha512>>>` due to unsatisfied trait bounds
    |
   ::: /Users/bascule/.cargo/registry/src/github.com-1ecc6299db9ec823/rsa-0.7.0-rc.0/src/pkcs1v15.rs:406:1
    |
406 | pub struct VerifyingKey<D>
    | --------------------------
    | |
    | doesn't satisfy `_: Default`
    | doesn't satisfy `_: FixedOutput`
    | doesn't satisfy `_: HashMarker`
    | doesn't satisfy `_: Update`
    | doesn't satisfy `_: sha2::Digest`
    |
   ::: /Users/bascule/.cargo/registry/src/github.com-1ecc6299db9ec823/digest-0.10.5/src/core_api/wrapper.rs:24:1
    |
24  | pub struct CoreWrapper<T>
    | ------------------------- doesn't satisfy `_: AssociatedOid`
    |
    = note: the following trait bounds were not satisfied:
            `CoreWrapper<CtVariableCoreWrapper<Sha512VarCore, signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<UTerm, B1>, B0>, B0>, B0>, B0>, B0>, B0>, OidSha512>>: AssociatedOid`
            `rsa::pkcs1v15::VerifyingKey<CoreWrapper<CtVariableCoreWrapper<Sha512VarCore, signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<UTerm, B1>, B0>, B0>, B0>, B0>, B0>, B0>, OidSha512>>>: FixedOutput`
            which is required by `rsa::pkcs1v15::VerifyingKey<CoreWrapper<CtVariableCoreWrapper<Sha512VarCore, signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<UTerm, B1>, B0>, B0>, B0>, B0>, B0>, B0>, OidSha512>>>: sha2::Digest`
            `rsa::pkcs1v15::VerifyingKey<CoreWrapper<CtVariableCoreWrapper<Sha512VarCore, signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<UTerm, B1>, B0>, B0>, B0>, B0>, B0>, B0>, OidSha512>>>: Default`
            which is required by `rsa::pkcs1v15::VerifyingKey<CoreWrapper<CtVariableCoreWrapper<Sha512VarCore, signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<UTerm, B1>, B0>, B0>, B0>, B0>, B0>, B0>, OidSha512>>>: sha2::Digest`
            `rsa::pkcs1v15::VerifyingKey<CoreWrapper<CtVariableCoreWrapper<Sha512VarCore, signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<UTerm, B1>, B0>, B0>, B0>, B0>, B0>, B0>, OidSha512>>>: Update`
            which is required by `rsa::pkcs1v15::VerifyingKey<CoreWrapper<CtVariableCoreWrapper<Sha512VarCore, signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<UTerm, B1>, B0>, B0>, B0>, B0>, B0>, B0>, OidSha512>>>: sha2::Digest`
            `rsa::pkcs1v15::VerifyingKey<CoreWrapper<CtVariableCoreWrapper<Sha512VarCore, signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<UTerm, B1>, B0>, B0>, B0>, B0>, B0>, B0>, OidSha512>>>: HashMarker`
            which is required by `rsa::pkcs1v15::VerifyingKey<CoreWrapper<CtVariableCoreWrapper<Sha512VarCore, signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<UTerm, B1>, B0>, B0>, B0>, B0>, B0>, B0>, OidSha512>>>: sha2::Digest`
            `&rsa::pkcs1v15::VerifyingKey<CoreWrapper<CtVariableCoreWrapper<Sha512VarCore, signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<UTerm, B1>, B0>, B0>, B0>, B0>, B0>, B0>, OidSha512>>>: FixedOutput`
            which is required by `&rsa::pkcs1v15::VerifyingKey<CoreWrapper<CtVariableCoreWrapper<Sha512VarCore, signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<UTerm, B1>, B0>, B0>, B0>, B0>, B0>, B0>, OidSha512>>>: sha2::Digest`
            `&rsa::pkcs1v15::VerifyingKey<CoreWrapper<CtVariableCoreWrapper<Sha512VarCore, signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<UTerm, B1>, B0>, B0>, B0>, B0>, B0>, B0>, OidSha512>>>: Default`
            which is required by `&rsa::pkcs1v15::VerifyingKey<CoreWrapper<CtVariableCoreWrapper<Sha512VarCore, signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<UTerm, B1>, B0>, B0>, B0>, B0>, B0>, B0>, OidSha512>>>: sha2::Digest`
            `&rsa::pkcs1v15::VerifyingKey<CoreWrapper<CtVariableCoreWrapper<Sha512VarCore, signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<UTerm, B1>, B0>, B0>, B0>, B0>, B0>, B0>, OidSha512>>>: Update`
            which is required by `&rsa::pkcs1v15::VerifyingKey<CoreWrapper<CtVariableCoreWrapper<Sha512VarCore, signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<UTerm, B1>, B0>, B0>, B0>, B0>, B0>, B0>, OidSha512>>>: sha2::Digest`
            `&rsa::pkcs1v15::VerifyingKey<CoreWrapper<CtVariableCoreWrapper<Sha512VarCore, signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<UTerm, B1>, B0>, B0>, B0>, B0>, B0>, B0>, OidSha512>>>: HashMarker`
            which is required by `&rsa::pkcs1v15::VerifyingKey<CoreWrapper<CtVariableCoreWrapper<Sha512VarCore, signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<UTerm, B1>, B0>, B0>, B0>, B0>, B0>, B0>, OidSha512>>>: sha2::Digest`
            `&mut rsa::pkcs1v15::VerifyingKey<CoreWrapper<CtVariableCoreWrapper<Sha512VarCore, signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<UTerm, B1>, B0>, B0>, B0>, B0>, B0>, B0>, OidSha512>>>: FixedOutput`
            which is required by `&mut rsa::pkcs1v15::VerifyingKey<CoreWrapper<CtVariableCoreWrapper<Sha512VarCore, signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<UTerm, B1>, B0>, B0>, B0>, B0>, B0>, B0>, OidSha512>>>: sha2::Digest`
            `&mut rsa::pkcs1v15::VerifyingKey<CoreWrapper<CtVariableCoreWrapper<Sha512VarCore, signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<UTerm, B1>, B0>, B0>, B0>, B0>, B0>, B0>, OidSha512>>>: Default`
            which is required by `&mut rsa::pkcs1v15::VerifyingKey<CoreWrapper<CtVariableCoreWrapper<Sha512VarCore, signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<UTerm, B1>, B0>, B0>, B0>, B0>, B0>, B0>, OidSha512>>>: sha2::Digest`
            `&mut rsa::pkcs1v15::VerifyingKey<CoreWrapper<CtVariableCoreWrapper<Sha512VarCore, signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<UTerm, B1>, B0>, B0>, B0>, B0>, B0>, B0>, OidSha512>>>: Update`
            which is required by `&mut rsa::pkcs1v15::VerifyingKey<CoreWrapper<CtVariableCoreWrapper<Sha512VarCore, signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<UTerm, B1>, B0>, B0>, B0>, B0>, B0>, B0>, OidSha512>>>: sha2::Digest`
            `&mut rsa::pkcs1v15::VerifyingKey<CoreWrapper<CtVariableCoreWrapper<Sha512VarCore, signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<UTerm, B1>, B0>, B0>, B0>, B0>, B0>, B0>, OidSha512>>>: HashMarker`
            which is required by `&mut rsa::pkcs1v15::VerifyingKey<CoreWrapper<CtVariableCoreWrapper<Sha512VarCore, signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<UTerm, B1>, B0>, B0>, B0>, B0>, B0>, B0>, OidSha512>>>: sha2::Digest`

@tarcieri
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tarcieri commented Sep 26, 2022 •
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A note re: above: it becomes very very hard to tell what's happening when dealing with errors like above but trying to figure out e.g. Sha256 vs Sha512, as these are:

SHA-256

CoreWrapper<CtVariableCoreWrapper<Sha256VarCore, signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<UTerm, B1>, B0>, B0>, B0>, B0>, B0>>>

SHA-512

CoreWrapper<CtVariableCoreWrapper<Sha512VarCore, signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<signature::digest::typenum::UInt<UTerm, B1>, B0>, B0>, B0>, B0>, B0>, B0>>>>

There is just so much syntactic noise the actual important parts become very difficult to find/compare.

@tarcieri
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tarcieri commented Sep 26, 2022 •
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The solution to all of the above was to enable the oid feature of sha2, however arriving at that was incredibly counterintuitive given the error messages, and that's coming from the perspective of a developer of these crates.

For now we're going to need to make all of this very clear in the documentation, with examples of the error messages and suggested resolutions.

@newpavlov
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Most of the noise comes from typenum, with const generics we would get something like CoreWrapper<CtVariableCoreWrapper<Sha512VarCore, 64>>>, which is not ideal, but still much better. I wonder if something like this could help eventually.

Regardless of the horrible error messages, maybe we should make the oid feature enabled by default or even make it non-gated in the next breaking releases?

@tarcieri tarcieri mentioned this issue Feb 12, 2024
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digest: add newtype! macro RustCrypto/traits
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@tarcieri @newpavlov and others