Adds support for max depth 0 for blake2b and fixes tests

Author: kobigurk

blake2b/src/lib.rs

@@ -287,10 +287,9 @@ impl Params {
         self
     }
 
-    /// From 1 (the default, meaning sequential) to 255 (meaning unlimited).
+    /// From 0, through 1 (the default, meaning sequential) to 255 (meaning unlimited).
     #[inline]
     pub fn max_depth(&mut self, depth: u8) -> &mut Self {
-        assert!(depth != 0, "Bad max depth: {}", depth);
         self.max_depth = depth;
         self
     }

blake2b/src/test.rs

@@ -172,8 +172,7 @@ fn test_long_personal_panics() {
 }
 
 #[test]
-#[should_panic]
-fn test_zero_max_depth_panics() {
+fn test_zero_max_depth_supported() {
     Params::new().max_depth(0);
 }
 

blake2s/src/test.rs

@@ -168,8 +168,7 @@ fn test_long_personal_panics() {
 }
 
 #[test]
-#[should_panic]
-fn test_zero_max_depth_panics() {
+fn test_zero_max_depth_supported() {
     Params::new().max_depth(0);
 }