Extend fuzzing for ctap1 and ctap2 requests

Previously, we only fuzzed the deserialization of
PublicKeyCredentialUserEntity.  This patch replaces that fuzz target
with the deserialization of entire ctap1 and ctap2 requests.

fuzz/Cargo.toml

@@ -1,16 +1,15 @@
-
 [package]
 name = "ctap-types-fuzz"
 version = "0.0.0"
-authors = ["Automatically generated"]
 publish = false
-edition = "2018"
+edition = "2021"
 
 [package.metadata]
 cargo-fuzz = true
 
 [dependencies]
-libfuzzer-sys = "0.3"
+iso7816 = "0.1.2"
+libfuzzer-sys = "0.4"
 
 [dependencies.ctap-types]
 path = ".."
@@ -20,5 +19,15 @@ path = ".."
 members = ["."]
 
 [[bin]]
-name = "example"
-path = "fuzz_targets/example.rs"
+name = "ctap1"
+path = "fuzz_targets/ctap1.rs"
+test = false
+doc = false
+bench = false
+
+[[bin]]
+name = "ctap2"
+path = "fuzz_targets/ctap2.rs"
+test = false
+doc = false
+bench = false

fuzz/fuzz_targets/ctap1.rs

@@ -0,0 +1,11 @@
+#![no_main]
+
+use ctap_types::ctap1::Request;
+use iso7816::command::Command;
+use libfuzzer_sys::fuzz_target;
+
+fuzz_target!(|data: &[u8]| {
+    if let Ok(command) = Command::<7609>::try_from(data) {
+        Request::try_from(&command).ok();
+    }
+});

fuzz/fuzz_targets/ctap2.rs

@@ -0,0 +1,8 @@
+#![no_main]
+
+use ctap_types::ctap2::Request;
+use libfuzzer_sys::fuzz_target;
+
+fuzz_target!(|data: &[u8]| {
+    Request::deserialize(data).ok();
+});