Replace `RAD_DEBUG` with `RAD_SEED`

The latter is strictly more powerful.

radicle-cli/tests/commands.rs

@@ -94,7 +94,10 @@ fn rad_auth() {
         "examples/rad-auth.md",
         Path::new("."),
         None,
-        [("RAD_DEBUG", "1")],
+        [(
+            "RAD_SEED",
+            "ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff",
+        )],
     )
     .unwrap();
 }

radicle-crypto/src/lib.rs

@@ -499,11 +499,20 @@ pub mod keypair {
     /// Generate a new keypair using OS randomness.
     pub fn generate() -> KeyPair {
         #[cfg(debug_assertions)]
-        if std::env::var("RAD_DEBUG").is_ok() {
+        if let Ok(seed) = std::env::var("RAD_SEED") {
-            // Generate a test keypair that is always the same.
+            // Generate a keypair based on the given environment variable.
             // This is useful for debugging and testing, since the
-            // public key is known in advance.
+            // public key can be known in advance.
-            return KeyPair::from_seed(Seed::new([0xff; 32]));
+            let seed = (0..seed.len())
+                .step_by(2)
+                .map(|i| u8::from_str_radix(&seed[i..i + 2], 16))
+                .collect::<Result<Vec<u8>, _>>()
+                .expect("generate: invalid hexadecimal value set in `RAD_SEED`");
+            let seed: [u8; 32] = seed
+                .try_into()
+                .expect("generate: invalid seed length set in `RAD_SEED`");
+
+            return KeyPair::from_seed(Seed::new(seed));
         }
         KeyPair::generate()
     }

radicle-httpd/src/api/test.rs

@@ -27,7 +27,10 @@ pub fn seed(dir: &Path) -> Context {
     let rad_home = dir.join("radicle");
 
     env::set_var("RAD_PASSPHRASE", PASSWORD);
-    env::set_var("RAD_DEBUG", "1");
+    env::set_var(
+        "RAD_SEED",
+        "ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff",
+    );
 
     fs::create_dir_all(&workdir).unwrap();
     fs::create_dir_all(&rad_home).unwrap();