keyfork-mnemonic-generate: properly slice entropy

keyfork-mnemonic-generate/src/main.rs

@@ -172,7 +172,7 @@ fn bitslice_to_usize(bitslice: [bool; 11]) -> usize {
     index
 }
 
-fn main() -> Result<(), Box<dyn Error>> {
+fn main() -> Result<()> {
     if !env::vars()
         .any(|(name, _)| name == "SHOOT_SELF_IN_FOOT" || name == "INSECURE_HARDWARE_ALLOWED")
     {
@@ -194,7 +194,7 @@ fn main() -> Result<(), Box<dyn Error>> {
     let entropy = &mut [0u8; 256 / 8];
     random_handle.read_exact(&mut entropy[..])?;
 
-    let mnemonic = Mnemonic::from_entropy(entropy)?;
+    let mnemonic = Mnemonic::from_entropy(&entropy[..bit_size / 8])?;
 
     println!("{mnemonic}");
 
@@ -216,7 +216,7 @@ mod tests {
     }
 
     #[test]
-    fn loads_mnemonics() -> Result<(), Box<dyn super::Error>> {
+    fn loads_mnemonics() -> Result<()> {
         let content = include_str!("test/vectors.json");
         let jsonobj: serde_json::Value = serde_json::from_str(content)?;