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// Copyright 2011 The Closure Library Authors. All Rights Reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS-IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
/**
* @fileoverview Abstract cryptographic hash interface.
*
* See goog.crypt.Sha1 and goog.crypt.Md5 for sample implementations.
*
*/
goog.provide('goog.crypt.Hash');
/**
* Create a cryptographic hash instance.
*
* @constructor
* @struct
*/
goog.crypt.Hash = function() {
/**
* The block size for the hasher.
* @type {number}
*/
this.blockSize = -1;
};
/**
* Resets the internal accumulator.
*/
goog.crypt.Hash.prototype.reset = goog.abstractMethod;
/**
* Adds a byte array (array with values in [0-255] range) or a string (must
* only contain 8-bit, i.e., Latin1 characters) to the internal accumulator.
*
* Many hash functions operate on blocks of data and implement optimizations
* when a full chunk of data is readily available. Hence it is often preferable
* to provide large chunks of data (a kilobyte or more) than to repeatedly
* call the update method with few tens of bytes. If this is not possible, or
* not feasible, it might be good to provide data in multiplies of hash block
* size (often 64 bytes). Please see the implementation and performance tests
* of your favourite hash.
*
* @param {Array<number>|Uint8Array|string} bytes Data used for the update.
* @param {number=} opt_length Number of bytes to use.
*/
goog.crypt.Hash.prototype.update = goog.abstractMethod;
/**
* @return {!Array<number>} The finalized hash computed
* from the internal accumulator.
*/
goog.crypt.Hash.prototype.digest = goog.abstractMethod;
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