RustCrypto in TockEnv (#625)

* Adds a rust_crypto feature to Tock

* -O3 for RustCrypto

Cargo.toml

@@ -42,6 +42,7 @@ with_ctap1 = ["crypto/with_ctap1", "opensk/with_ctap1"]
 with_nfc = ["libtock_drivers/with_nfc"]
 vendor_hid = ["opensk/vendor_hid"]
 ed25519 = ["ed25519-compact", "opensk/ed25519"]
+rust_crypto = ["opensk/rust_crypto"]
 
 [dev-dependencies]
 enum-iterator = "0.6.0"
@@ -60,3 +61,8 @@ panic = "abort"
 lto = true # Link Time Optimization usually reduces size of binaries and static libraries
 opt-level = "z"
 codegen-units = 1
+
+[profile.release.package]
+aes = { opt-level = 3 }
+sha2 = { opt-level = 3 }
+p256 = { opt-level = 3 }