Add signed ActivityPub server federation flows

Cargo.toml

@@ -18,13 +18,18 @@ repository = "https://github.com/fedify-dev/feder"
 [workspace.dependencies]
 # Keep workspace crate versions in sync with [workspace.package].version.
 # Use `mise run bump-execute <version>` instead of editing these by hand.
+base64 = { version = "0.22.1", default-features = false, features = ["alloc"] }
 feder-core = { version = "0.1.0", path = "crates/feder-core" }
 feder-runtime-server = { version = "0.1.0", path = "crates/feder-runtime-server" }
 feder-vocab = { version = "0.1.0", path = "crates/feder-vocab" }
 iri-string = { version = "0.7.12", default-features = false, features = ["alloc", "serde"] }
+rand_chacha = { version = "0.3.1", default-features = false }
+rand_core = { version = "0.6.4", features = ["getrandom"] }
+rsa = { version = "0.9.10", default-features = false, features = ["pem", "sha2", "u64_digit"] }
 serde = { version = "1.0.219", default-features = false, features = ["alloc", "derive"] }
 serde_json = "1.0.140"
 tower = { version = "0.5", features = ["util"]}
+zeroize = { version = "1.9.0", default-features = false, features = ["alloc"] }
 
 [workspace.lints.rust]
 warnings = "deny"

crates/feder-core/Cargo.toml

@@ -8,8 +8,17 @@ license.workspace = true
 homepage.workspace = true
 repository.workspace = true
 
+[features]
+http-signatures = ["dep:base64", "dep:rsa", "dep:zeroize"]
+
 [dependencies]
+base64 = { workspace = true, optional = true }
 feder-vocab.workspace = true
+rsa = { workspace = true, optional = true }
+zeroize = { workspace = true, optional = true }
+
+[dev-dependencies]
+rand_chacha.workspace = true
 
 [lints]
 workspace = true