问题: 上传图片含有大量重复
解决思路.获取图片MD5值 传到后台进行比较
一、引入spark-md5.js
var sMD5 = require('../../../utils/spark-md5.js')
二、选择图片获取文件
三、spark-md5.js
参考： https://blog.csdn.net/aaron9185/article/details/84855014
1、下载MD5源文件(JS)2、在小程序模块中使用require引入外部模块；也可以在index.html中直接全局引入md5.js文件。
因为源md5.js中没有队模块因为输出，如果使用require需要export，所以在md5.js中需要加入以下代码：
module.exports = {
hexMD5: hex_md5, //需要输出的加密算法，我这边只写了我需要得两种
b64Md5: b64_md5,
}
在js文件中使用require引入md5:
const md5 = require('../../assets/js/md5/md5.js')
使用：
let b64 = md5.b64Md5(code)//code需要加密的数据
下面是我的文件结构：
md5.js 代码如下
/*
* A JavaScript implementation of the RSA Data Security, Inc. MD5 Message
* Digest Algorithm, as defined in RFC 1321.
* Version 2.1 Copyright (C) Paul Johnston 1999 - 2002.
* Other contributors: Greg Holt, Andrew Kepert, Ydnar, Lostinet
* Distributed under the BSD License
* See http://pajhome.org.uk/crypt/md5 for more info.
*/
/*
* Configurable variables. You may need to tweak these to be compatible with
* the server-side, but the defaults work in most cases.
*/
var hexcase =
0
/* hex output format. 0 - lowercase1 - uppercase */
var b64pad =
""
/* base-64 pad character. "=" for strict RFC compliance */
var chrsz =
8
/* bits per input character. 8 - ASCII16 - Unicode */
/*
* These are the functions you'll usually want to call
* They take string arguments and return either hex or base-64 encoded strings
*/
function hex_md5(s){
return binl2hex(core_md5(str2binl(s), s.length * chrsz))}
function b64_md5(s){
return binl2b64(core_md5(str2binl(s), s.length * chrsz))}
function str_md5(s){
return binl2str(core_md5(str2binl(s), s.length * chrsz))}
function hex_hmac_md5(key, data) {
return binl2hex(core_hmac_md5(key, data))}
function b64_hmac_md5(key, data) {
return binl2b64(core_hmac_md5(key, data))}
function str_hmac_md5(key, data) {
return binl2str(core_hmac_md5(key, data))}
/*
* Perform a simple self-test to see if the VM is working
*/
function md5_vm_test()
{
return hex_md5( "abc") ==
"900150983cd24fb0d6963f7d28e17f72"
}
/*
* Calculate the MD5 of an array of little-endian words, and a bit length
*/
function core_md5(x, len)
{
/* append padding */
x[len >>
5] |=
0x80 <<((len) %
32)
x[(((len +
64) >>>
9) <<
4) +
14] = len
var a =
1732584193
var b = - 271733879
var c = - 1732584194
var d =
271733878
for( var i =
0i <x.lengthi +=
16)
{
var olda = a
var oldb = b
var oldc = c
var oldd = d
a = md5_ff(a, b, c, d, x[i+
0],
7 , - 680876936)
d = md5_ff(d, a, b, c, x[i+
1],
12, - 389564586)
c = md5_ff(c, d, a, b, x[i+
2],
17,
606105819)
b = md5_ff(b, c, d, a, x[i+
3],
22, - 1044525330)
a = md5_ff(a, b, c, d, x[i+
4],
7 , - 176418897)
d = md5_ff(d, a, b, c, x[i+
5],
12,
1200080426)
c = md5_ff(c, d, a, b, x[i+
6],
17, - 1473231341)
b = md5_ff(b, c, d, a, x[i+
7],
22, - 45705983)
a = md5_ff(a, b, c, d, x[i+
8],
7 ,
1770035416)
d = md5_ff(d, a, b, c, x[i+
9],
12, - 1958414417)
c = md5_ff(c, d, a, b, x[i+ 10],
17, - 42063)
b = md5_ff(b, c, d, a, x[i+ 11],
22, - 1990404162)
a = md5_ff(a, b, c, d, x[i+ 12],
7 ,
1804603682)
d = md5_ff(d, a, b, c, x[i+ 13],
12, - 40341101)
c = md5_ff(c, d, a, b, x[i+ 14],
17, - 1502002290)
b = md5_ff(b, c, d, a, x[i+ 15],
22,
1236535329)
a = md5_gg(a, b, c, d, x[i+
1],
5 , - 165796510)
d = md5_gg(d, a, b, c, x[i+
6],
9 , - 1069501632)
c = md5_gg(c, d, a, b, x[i+ 11],
14,
643717713)
b = md5_gg(b, c, d, a, x[i+
0],
20, - 373897302)
a = md5_gg(a, b, c, d, x[i+
5],
5 , - 701558691)
d = md5_gg(d, a, b, c, x[i+ 10],
9 ,
38016083)
c = md5_gg(c, d, a, b, x[i+ 15],
14, - 660478335)
b = md5_gg(b, c, d, a, x[i+
4],
20, - 405537848)
a = md5_gg(a, b, c, d, x[i+
9],
5 ,
568446438)
d = md5_gg(d, a, b, c, x[i+ 14],
9 , - 1019803690)
c = md5_gg(c, d, a, b, x[i+
3],
14, - 187363961)
b = md5_gg(b, c, d, a, x[i+
8],
20,
1163531501)
a = md5_gg(a, b, c, d, x[i+ 13],
5 , - 1444681467)
d = md5_gg(d, a, b, c, x[i+
2],
9 , - 51403784)
c = md5_gg(c, d, a, b, x[i+
7],
14,
1735328473)
b = md5_gg(b, c, d, a, x[i+ 12],
20, - 1926607734)
a = md5_hh(a, b, c, d, x[i+
5],
4 , - 378558)
d = md5_hh(d, a, b, c, x[i+
8],
11, - 2022574463)
c = md5_hh(c, d, a, b, x[i+ 11],
16,
1839030562)
b = md5_hh(b, c, d, a, x[i+ 14],
23, - 35309556)
a = md5_hh(a, b, c, d, x[i+
1],
4 , - 1530992060)
d = md5_hh(d, a, b, c, x[i+
4],
11,
1272893353)
c = md5_hh(c, d, a, b, x[i+
7],
16, - 155497632)
b = md5_hh(b, c, d, a, x[i+ 10],
23, - 1094730640)
a = md5_hh(a, b, c, d, x[i+ 13],
4 ,
681279174)
d = md5_hh(d, a, b, c, x[i+
0],
11, - 358537222)
c = md5_hh(c, d, a, b, x[i+
3],
16, - 722521979)
b = md5_hh(b, c, d, a, x[i+
6],
23,
76029189)
a = md5_hh(a, b, c, d, x[i+
9],
4 , - 640364487)
d = md5_hh(d, a, b, c, x[i+ 12],
11, - 421815835)
c = md5_hh(c, d, a, b, x[i+ 15],
16,
530742520)
b = md5_hh(b, c, d, a, x[i+
2],
23, - 995338651)
a = md5_ii(a, b, c, d, x[i+
0],
6 , - 198630844)
d = md5_ii(d, a, b, c, x[i+
7],
10,
1126891415)
c = md5_ii(c, d, a, b, x[i+ 14],
15, - 1416354905)
b = md5_ii(b, c, d, a, x[i+
5],
21, - 57434055)
a = md5_ii(a, b, c, d, x[i+ 12],
6 ,
1700485571)
d = md5_ii(d, a, b, c, x[i+
3],
10, - 1894986606)
c = md5_ii(c, d, a, b, x[i+ 10],
15, - 1051523)
b = md5_ii(b, c, d, a, x[i+
1],
21, - 2054922799)
a = md5_ii(a, b, c, d, x[i+
8],
6 ,
1873313359)
d = md5_ii(d, a, b, c, x[i+ 15],
10, - 30611744)
c = md5_ii(c, d, a, b, x[i+
6],
15, - 1560198380)
b = md5_ii(b, c, d, a, x[i+ 13],
21,
1309151649)
a = md5_ii(a, b, c, d, x[i+
4],
6 , - 145523070)
d = md5_ii(d, a, b, c, x[i+ 11],
10, - 1120210379)
c = md5_ii(c, d, a, b, x[i+
2],
15,
718787259)
b = md5_ii(b, c, d, a, x[i+
9],
21, - 343485551)
a = safe_add(a, olda)
b = safe_add(b, oldb)
c = safe_add(c, oldc)
d = safe_add(d, oldd)
}
return Array(a, b, c, d)
}
/*
* These functions implement the four basic operations the algorithm uses.
*/
function md5_cmn(q, a, b, x, s, t)
{
return safe_add(bit_rol(safe_add(safe_add(a, q), safe_add(x, t)), s),b)
}
function md5_ff(a, b, c, d, x, s, t)
{
return md5_cmn((b &c) | ((~b) &d), a, b, x, s, t)
}
function md5_gg(a, b, c, d, x, s, t)
{
return md5_cmn((b &d) | (c &(~d)), a, b, x, s, t)
}
function md5_hh(a, b, c, d, x, s, t)
{
return md5_cmn(b ^ c ^ d, a, b, x, s, t)
}
function md5_ii(a, b, c, d, x, s, t)
{
return md5_cmn(c ^ (b | (~d)), a, b, x, s, t)
}
/*
* Calculate the HMAC-MD5, of a key and some data
*/
function core_hmac_md5(key, data)
{
var bkey = str2binl(key)
if(bkey.length >
16) bkey = core_md5(bkey, key.length * chrsz)
var ipad = Array( 16), opad = Array( 16)
for( var i =
0i <
16i++)
{
ipad[i] = bkey[i] ^
0x36363636
opad[i] = bkey[i] ^
0x5C5C5C5C
}
var hash = core_md5(ipad.concat(str2binl(data)),
512 + data.length * chrsz)
return core_md5(opad.concat(hash),
512 +
128)
}
/*
* Add integers, wrapping at 2^32. This uses 16-bit operations internally
* to work around bugs in some JS interpreters.
*/
function safe_add(x, y)
{
var lsw = (x &
0xFFFF) + (y &
0xFFFF)
var msw = (x >>
16) + (y >>
16) + (lsw >>
16)
return (msw <<
16) | (lsw &
0xFFFF)
}
/*
* Bitwise rotate a 32-bit number to the left.
*/
function bit_rol(num, cnt)
{
return (num <<cnt) | (num >>>( 32 - cnt))
}
/*
* Convert a string to an array of little-endian words
* If chrsz is ASCII, characters >255 have their hi-byte silently ignored.
*/
function str2binl(str)
{
var bin = Array()
var mask = ( 1 <<chrsz) -
1
for( var i =
0i <str.length * chrszi += chrsz)
bin[i>> 5] |= (str.charCodeAt(i / chrsz) &mask) <<(i% 32)
return bin
}
/*
* Convert an array of little-endian words to a string
*/
function binl2str(bin)
{
var str =
""
var mask = ( 1 <<chrsz) -
1
for( var i =
0i <bin.length *
32i += chrsz)
str += String.fromCharCode((bin[i>> 5] >>>(i %
32)) &mask)
return str
}
/*
* Convert an array of little-endian words to a hex string.
*/
function binl2hex(binarray)
{
var hex_tab = hexcase ?
"0123456789ABCDEF" :
"0123456789abcdef"
var str =
""
for( var i =
0i <binarray.length *
4i++)
{
str += hex_tab.charAt((binarray[i>> 2] >>((i% 4)* 8+ 4)) &
0xF) +
hex_tab.charAt((binarray[i>> 2] >>((i% 4)* 8 )) &
0xF)
}
return str
}
/*
* Convert an array of little-endian words to a base-64 string
*/
function binl2b64(binarray)
{
var tab =
"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/"
var str =
""
for( var i =
0i <binarray.length *
4i +=
3)
{
var triplet = (((binarray[i >>
2] >>
8 * ( i % 4)) &
0xFF) <<
16)
| (((binarray[i+ 1 >>
2] >>
8 * ((i+ 1)% 4)) &
0xFF) <<
8 )
| ((binarray[i+ 2 >>
2] >>
8 * ((i+ 2)% 4)) &
0xFF)
for( var j =
0j <
4j++)
{
if(i *
8 + j *
6 >binarray.length *
32) str += b64pad
else str += tab.charAt((triplet >>
6*( 3-j)) &
0x3F)
}
}
return str
}
module.exports = {
hexMD5: hex_md5,
b64Md5: b64_md5,
}
login.js是我们的业务js区域,首先我们这样引用md5.js
然后我们这样使用md5.js中的md5加密函数对字符进行加密
这样就可以对密码进行md5加密了
