91 lines
2.5 KiB
Haxe
91 lines
2.5 KiB
Haxe
/*
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* Copyright (C)2005-2019 Haxe Foundation
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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* DEALINGS IN THE SOFTWARE.
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*/
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package haxe.crypto;
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/**
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Hash methods for Hmac calculation.
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**/
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enum HashMethod {
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MD5;
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SHA1;
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SHA256;
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}
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/**
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Calculates a Hmac of the given Bytes using a HashMethod.
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**/
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class Hmac {
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var method:HashMethod;
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var blockSize:Int;
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var length:Int;
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public function new(hashMethod:HashMethod) {
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method = hashMethod;
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blockSize = switch (hashMethod) {
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case MD5, SHA1, SHA256: 64;
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}
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length = switch (hashMethod) {
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case MD5: 16;
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case SHA1: 20;
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case SHA256: 32;
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}
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}
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inline function doHash(b:haxe.io.Bytes):haxe.io.Bytes {
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return switch (method) {
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case MD5: Md5.make(b);
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case SHA1: Sha1.make(b);
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case SHA256: Sha256.make(b);
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}
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}
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function nullPad(s:haxe.io.Bytes, chunkLen:Int):haxe.io.Bytes {
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var r = chunkLen - (s.length % chunkLen);
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if (r == chunkLen && s.length != 0)
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return s;
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var sb = new haxe.io.BytesBuffer();
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sb.add(s);
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for (x in 0...r)
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sb.addByte(0);
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return sb.getBytes();
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}
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public function make(key:haxe.io.Bytes, msg:haxe.io.Bytes):haxe.io.Bytes {
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if (key.length > blockSize) {
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key = doHash(key);
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}
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key = nullPad(key, blockSize);
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var Ki = new haxe.io.BytesBuffer();
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var Ko = new haxe.io.BytesBuffer();
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for (i in 0...key.length) {
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Ko.addByte(key.get(i) ^ 0x5c);
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Ki.addByte(key.get(i) ^ 0x36);
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}
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// hash(Ko + hash(Ki + message))
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Ki.add(msg);
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Ko.add(doHash(Ki.getBytes()));
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return doHash(Ko.getBytes());
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}
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}
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