The default features are always enabled unless specifically disabled. The default feature enables the feature safe_api.

Example:

[dependencies.orion]
version = "*" # Replace * with the most recent version

This feature enables the optional dependencies on getrandom and ct-codecs. getrandom is the dependency that allows for secure generation of keys, nonces, and other types that require cryptographically strong randomness. ct-codecs is used for the high-level API only, whereas getrandom also enables hazardous-level functionality.

All functionality that is enabled through the two aforementioned dependencies must be enabled through safe_api. In other words, you cannot specify the getrandom feature (a different feature for each dependency is automatically generated) to make the T::generate() APIs are available for newtypes.

The safe_api feature requires access to std.

Example: Same as default.

This enables (de)serialization of select types by enabling the optional serde dependency. The dependency itself uses Rust alloc module, because it requires heap-allocations.

The serde feature is expected to be enabled with either Orion's alloc or safe_api/default features.

Example:

[dependencies.orion]
version = "*" # Replace * with the most recent version
features = ["serde"] 

[dependencies.orion]
version = "*" # Replace * with the most recent version
default-features = false
features = ["alloc", "serde"] 

The alloc feature is defined for APIs that require heap-allocations but without the use of std. The feature enables the use of Argon2i in hazardous, where the user has access to a heap-allocator but not std.

It is assumed that if alloc is enabled, safe_api is not.

Example:

[dependencies.orion]
version = "*" # Replace * with the most recent version
default-features = false
features = ["alloc"] 

Orion is defined as no_std as long as safe_api is not enabled. When no additional features have been enabled and the default is disabled (as shown in the example below), Orion performs no heap allocations.

Example:

[dependencies.orion]
version = "*" # Replace * with the most recent version
default-features = false