| // Copyright (c) 2015, the Dart project authors. Please see the AUTHORS file |
| // for details. All rights reserved. Use of this source code is governed by a |
| // BSD-style license that can be found in the LICENSE file. |
| |
| library crypto.utils; |
| |
| // Constants. |
| const MASK_8 = 0xff; |
| const MASK_32 = 0xffffffff; |
| const BITS_PER_BYTE = 8; |
| const BYTES_PER_WORD = 4; |
| |
| // Helper methods. |
| 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. |
| int rotl32(int val, int shift) { |
| var mod_shift = shift & 31; |
| return ((val << mod_shift) & MASK_32) | |
| ((val & MASK_32) >> (32 - mod_shift)); |
| } |
