Index: lib/src/utils.dart |
diff --git a/lib/src/utils.dart b/lib/src/utils.dart |
index 3f8a5c990c53277fb7ad60324e2c4d669124e721..f2f265db1830e66739c6a6fd4c04410181de2c17 100644 |
--- a/lib/src/utils.dart |
+++ b/lib/src/utils.dart |
@@ -4,20 +4,23 @@ |
library crypto.utils; |
-// Constants. |
+/// A bitmask that limits an integer to 8 bits. |
const MASK_8 = 0xff; |
+ |
+/// A bitmask that limits an integer to 32 bits. |
const MASK_32 = 0xffffffff; |
+ |
+/// The number of bits in a byte. |
const BITS_PER_BYTE = 8; |
+ |
+/// The number of bytes in a 32-bit word. |
const BYTES_PER_WORD = 4; |
-// Helper methods. |
+/// Adds [x] and [y] with 32-bit overflow semantics. |
int add32(x, y) => (x + y) & MASK_32; |
-int roundUp(val, n) => (val + n - 1) & -n; |
- |
-// Helper functions used by more than one hasher. |
- |
-// Rotate left limiting to unsigned 32-bit values. |
+/// Bitwise rotates [val] to the left by [shift], obeying 32-bit overflow |
+/// semantics. |
int rotl32(int val, int shift) { |
var mod_shift = shift & 31; |
return ((val << mod_shift) & MASK_32) | |