Builder feature on no-std and no getrandom supported targets

[MihaelBercic]

Would it be possible to have the "builder" feature be without the "std" feature and without the "getrandom" dependency?

For usage on no-std targets and no getrandom supported targets (esp32).

[tarcieri]

It looks like the one usage of std is for SystemTime to build the signing time attribute.

That can potentially be replaced by an explicit parameter, similar to how the ssh-key crate works.

Offhand I don't see where the builder is pulling in getrandom though.

[MihaelBercic]

That'd be awesome.

Regarding the getrandom, it seems to be:

cargo tree --edges all

│   │   │   ├── rsa feature "std"
│   │   │   │   ├── rsa v0.9.7 (*)
│   │   │   │   ├── rand_core feature "std"
│   │   │   │   │   ├── rand_core v0.6.4 (*)
│   │   │   │   │   ├── rand_core feature "alloc"
│   │   │   │   │   │   └── rand_core v0.6.4 (*)
│   │   │   │   │   ├── rand_core feature "getrandom"
│   │   │   │   │   │   └── rand_core v0.6.4 (*)
│   │   │   │   │   └── getrandom feature "std"
│   │   │   │   │       └── getrandom v0.2.15 (*)

and

── cms feature "builder"
│   ├── cms v0.2.3
│   │   ├── aes feature "default"
│   │   │   └── aes v0.8.4
│   │   │       ├── cfg-if feature "default"
│   │   │       │   └── cfg-if v1.0.0
│   │   │       └── cipher feature "default"
│   │   │           └── cipher v0.4.4
│   │   │               ├── crypto-common feature "default"
│   │   │               │   └── crypto-common v0.1.6
│   │   │               │       ├── generic-array feature "default"
│   │   │               │       │   └── generic-array v0.14.7
│   │   │               │       │       └── typenum feature "default"
│   │   │               │       │           └── typenum v1.18.0
│   │   │               │       │       [build-dependencies]
│   │   │               │       │       └── version_check feature "default"
│   │   │               │       │           └── version_check v0.9.5
│   │   │               │       ├── generic-array feature "more_lengths"
│   │   │               │       │   └── generic-array v0.14.7 (*)
│   │   │               │       ├── typenum feature "default" (*)
│   │   │               │       └── rand_core feature "default"
│   │   │               │           └── rand_core v0.6.4
│   │   │               │               └── getrandom feature "default"
│   │   │               │                   └── getrandom v0.2.15
│   │   │               │                       └── cfg-if feature "default" (*)

[tarcieri]

Might need to add default-features = false to rsa and possibly aes too

[MihaelBercic]

Might need to add default-features = false to rsa and possibly aes too

Thank you