UnknownObject/js-md2
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* Remove ascii parameter.

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* Improve performance.
* Add test case.
This commit is contained in:
Chen Yi-Cyuan
2015-02-28 15:16:53 +08:00
parent 32c00d7646
commit e5c451015b
9 changed files with 162 additions and 142 deletions
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src/md2.js
+101 -95
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@@ -1,5 +1,5 @@
/*
* js-md5 v0.1.2
* js-md5 v0.2.0
* https://github.com/emn178/js-md2
*
* Copyright 2014-2015, emn178@gmail.com
@@ -10,6 +10,10 @@
;(function(root, undefined) {
'use strict';
var NODE_JS = typeof(module) != 'undefined';
if(NODE_JS) {
root = global;
}
var HEX_CHARS = '0123456789abcdef'.split('');
var S = [ 0x29, 0x2E, 0x43, 0xC9, 0xA2, 0xD8, 0x7C, 0x01, 0x3D, 0x36, 0x54, 0xA1, 0xEC, 0xF0, 0x06, 0x13,
@@ -29,112 +33,114 @@
0xF2, 0xEF, 0xB7, 0x0E, 0x66, 0x58, 0xD0, 0xE4, 0xA6, 0x77, 0x72, 0xF8, 0xEB, 0x75, 0x4B, 0x0A,
0x31, 0x44, 0x50, 0xB4, 0x8F, 0xED, 0x1F, 0x1A, 0xDB, 0x99, 0x8D, 0x33, 0x9F, 0x11, 0x83, 0x14];
var M = [], X = [], C = [];
var md2 = function(message, asciiOnly) {
var M, X = [], i, j;
if(!asciiOnly && /[^\x00-\x7F]/.test(message)) {
M = getBlocksFromUtf8(message);
} else {
M = getBlocksFromAscii(message);
}
appendChecksum(M);
var code, i, j, k, t, L = 0, loop = 1, B,
index = 0, start = 0, bytes = 0, length = message.length;
for(i = 0;i < 48;++i) {
X[i] = 0;
for(i = 0;i < 16;++i) {
X[i] = C[i] = 0;
}
var length = M.length >> 4, hex = '';
for(i = 0;i < length;++i) {
for(j = 0;j < 16;++j) {
X[16 + j] = M[(i << 4) + j];
X[32 + j] = X[16 + j] ^ X[j];
}
var t = 0;
for(j = 0;j < 18;++j) {
for(var k = 0;k < 48;++k) {
X[k] = t = X[k] ^ S[t];
M[16] = M[17] = M[18] = 0;
do {
M[0] = M[16];
M[1] = M[17];
M[2] = M[18];
M[16] = M[17] = M[18] = M[3] =
M[4] = M[5] = M[6] = M[7] =
M[8] = M[9] = M[10] = M[11] =
M[12] = M[13] = M[14] = M[15] = 0;
for (i = start;index < length && i < 16; ++index) {
code = message.charCodeAt(index);
if (code < 0x80) {
M[i++] = code;
} else if (code < 0x800) {
M[i++] = 0xc0 | (code >> 6);
M[i++] = 0x80 | (code & 0x3f);
} else if (code < 0xd800 || code >= 0xe000) {
M[i++] = 0xe0 | (code >> 12);
M[i++] = 0x80 | ((code >> 6) & 0x3f);
M[i++] = 0x80 | (code & 0x3f);
} else {
code = 0x10000 + (((code & 0x3ff) << 10) | (message.charCodeAt(++index) & 0x3ff));
M[i++] = 0xf0 | (code >> 18);
M[i++] = 0x80 | ((code >> 12) & 0x3f);
M[i++] = 0x80 | ((code >> 6) & 0x3f);
M[i++] = 0x80 | (code & 0x3f);
}
t = (t + j) & 0xFF;
}
}
bytes += i - start;
start = i - 16;
if(index == length && i < 16) {
loop = 2;
t = 16 - (bytes & 15);
for(;i < 16;++i) {
M[i] = t;
}
}
for(i = 0;i < 16;++i) {
C[i] ^= S[M[i] ^ L];
L = C[i];
}
for(i = 0;i < loop;++i) {
B = i === 0 ? M : C;
X[16] = B[0];
X[32] = X[16] ^ X[0];
X[17] = B[1];
X[33] = X[17] ^ X[1];
X[18] = B[2];
X[34] = X[18] ^ X[2];
X[19] = B[3];
X[35] = X[19] ^ X[3];
X[20] = B[4];
X[36] = X[20] ^ X[4];
X[21] = B[5];
X[37] = X[21] ^ X[5];
X[22] = B[6];
X[38] = X[22] ^ X[6];
X[23] = B[7];
X[39] = X[23] ^ X[7];
X[24] = B[8];
X[40] = X[24] ^ X[8];
X[25] = B[9];
X[41] = X[25] ^ X[9];
X[26] = B[10];
X[42] = X[26] ^ X[10];
X[27] = B[11];
X[43] = X[27] ^ X[11];
X[28] = B[12];
X[44] = X[28] ^ X[12];
X[29] = B[13];
X[45] = X[29] ^ X[13];
X[30] = B[14];
X[46] = X[30] ^ X[14];
X[31] = B[15];
X[47] = X[31] ^ X[15];
t = 0;
for(j = 0;j < 18;++j) {
for(k = 0;k < 48;++k) {
X[k] = t = X[k] ^ S[t];
}
t = (t + j) & 0xFF;
}
}
} while(loop == 1);
var hex = '';
for(i = 0;i < 16;++i) {
hex += HEX_CHARS[(X[i] >> 4) & 0x0F] + HEX_CHARS[X[i] & 0x0F];
}
return hex;
};
var getBytesFromUtf8 = function(str) {
var bytes = [], index = 0;
for (var i = 0;i < str.length; i++) {
var c = str.charCodeAt(i);
if (c < 0x80) {
bytes[index++] = c;
} else if (c < 0x800) {
bytes[index++] = 0xc0 | (c >> 6);
bytes[index++] = 0x80 | (c & 0x3f);
} else if (c < 0xd800 || c >= 0xe000) {
bytes[index++] = 0xe0 | (c >> 12);
bytes[index++] = 0x80 | ((c >> 6) & 0x3f);
bytes[index++] = 0x80 | (c & 0x3f);
} else {
c = 0x10000 + (((c & 0x3ff) << 10) | (str.charCodeAt(++i) & 0x3ff));
bytes[index++] = 0xf0 | (c >> 18);
bytes[index++] = 0x80 | ((c >> 12) & 0x3f);
bytes[index++] = 0x80 | ((c >> 6) & 0x3f);
bytes[index++] = 0x80 | (c & 0x3f);
}
}
return bytes;
};
var getBlocksFromAscii = function(message) {
// a block is 8 bits(1 bytes), a chunk is 128 bits(16 bytes)
var length = message.length;
var chunkCount = (length >> 4) + 1;
var blockCount = chunkCount << 4; // chunkCount * 16
var blocks = [], i;
for(i = 0;i < length;++i) {
blocks[i] = message.charCodeAt(i);
}
var ibit = 16 - (length & 15);
for(;i < blockCount;++i) {
blocks[i] = ibit;
}
return blocks;
};
var getBlocksFromUtf8 = function(message) {
// a block is 8 bits(1 bytes), a chunk is 128 bits(16 bytes)
var bytes = getBytesFromUtf8(message);
var length = bytes.length;
var chunkCount = (length >> 4) + 1;
var blockCount = chunkCount << 4; // chunkCount * 16
var blocks = [], i;
for(i = 0;i < length;++i) {
blocks[i] = bytes[i];
}
var ibit = 16 - (length & 15);
for(;i < blockCount;++i) {
blocks[i] = ibit;
}
return blocks;
};
var appendChecksum = function(M) {
var checksum = [], L = 0, length = M.length >> 4, i;
for(i = 0;i < length;++i) {
for(var j = 0;j < 16;++j) {
var c = M[(i << 4) + j];
checksum[j] ^= S[c ^ L];
L = checksum[j];
}
}
length = M.length;
for(i = 0;i < 16;++i) {
M[length + i] = checksum[i];
}
};
if(typeof(module) != 'undefined') {
if(!root.JS_MD2_TEST && NODE_JS) {
module.exports = md2;
} else if(root) {
root.md2 = md2;