web里面密码直接传到后台是不安全的，有时候需要进行加密，找到一个不错的javascript SHA1算法：
<!DOCTYPE html>
<html lang="en"> <head>
<meta charset="UTF-8">
<title>SHA1算法</title>
</head> <body>
<script type="text/javascript">
/*
*
* A JavaScript implementation of the Secure Hash Algorithm, SHA-1, as defined
* in FIPS PUB 180-1
*
* By lizq
*
* 2006-11-11
*
*/
/*
*
* Configurable variables.
*
*/
var hexcase = 0; /* hex output format. 0 - lowercase; 1 - uppercase */
var chrsz = 8; /* bits per input character. 8 - ASCII; 16 - Unicode */
/*
*
* The main function to calculate message digest
*
*/
function hex_sha1(s) { return binb2hex(core_sha1(AlignSHA1(s))); } /*
*
* Perform a simple self-test to see if the VM is working
*
*/
function sha1_vm_test() { return hex_sha1("abc") == "a9993e364706816aba3e25717850c26c9cd0d89d"; } /*
*
* Calculate the SHA-1 of an array of big-endian words, and a bit length
*
*/
function core_sha1(blockArray) { var x = blockArray; // append padding
var w = Array(80); var a = 1732584193; var b = -271733879; var c = -1732584194; var d = 271733878; var e = -1009589776; for (var i = 0; i < x.length; i += 16) // 每次处理512位 16*32
{ var olda = a; var oldb = b; var oldc = c; var oldd = d; var olde = e; for (var j = 0; j < 80; j++) // 对每个512位进行80步操作
{ if (j < 16)
w[j] = x[i + j]; else
w[j] = rol(w[j - 3] ^ w[j - 8] ^ w[j - 14] ^ w[j - 16], 1); var t = safe_add(safe_add(rol(a, 5), sha1_ft(j, b, c, d)), safe_add(safe_add(e, w[j]), sha1_kt(j))); e = d; d = c; c = rol(b, 30); b = a; a = t; } a = safe_add(a, olda); b = safe_add(b, oldb); c = safe_add(c, oldc); d = safe_add(d, oldd); e = safe_add(e, olde); } return new Array(a, b, c, d, e); } /*
*
* Perform the appropriate triplet combination function for the current
* iteration
*
* 返回对应F函数的值
*
*/
function sha1_ft(t, b, c, d) { if (t < 20)
return (b & c) | ((~b) & d); if (t < 40)
return b ^ c ^ d; if (t < 60)
return (b & c) | (b & d) | (c & d); return b ^ c ^ d; // t<80
} /*
*
* Determine the appropriate additive constant for the current iteration
*
* 返回对应的Kt值
*
*/
function sha1_kt(t) { return (t < 20) ? 1518500249 : (t < 40) ? 1859775393 : (t < 60) ? -1894007588 : -899497514; } /*
*
* Add integers, wrapping at 2^32. This uses 16-bit operations internally
*
* to work around bugs in some JS interpreters.
*
* 将32位数拆成高16位和低16位分别进行相加，从而实现 MOD 2^32 的加法
*
*/
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.
*
* 32位二进制数循环左移
*
*/
function rol(num, cnt) { return (num << cnt) | (num >>> (32 - cnt)); } /*
*
* The standard SHA1 needs the input string to fit into a block
*
* This function align the input string to meet the requirement
*
*/
function AlignSHA1(str) { var nblk = ((str.length + 8) >> 6) + 1,
blks = new Array(nblk * 16); for (var i = 0; i < nblk * 16; i++)
blks[i] = 0; for (i = 0; i < str.length; i++) blks[i >> 2] |= str.charCodeAt(i) << (24 - (i & 3) * 8); blks[i >> 2] |= 0x80 << (24 - (i & 3) * 8); blks[nblk * 16 - 1] = str.length * 8; return blks; } /*
*
* Convert an array of big-endian words to a hex string.
*
*/
function binb2hex(binarray) { var hex_tab = hexcase ? "0123456789ABCDEF" : "0123456789abcdef"; var str = ""; for (var i = 0; i < binarray.length * 4; i++) { str += hex_tab.charAt((binarray[i >> 2] >> ((3 - i % 4) * 8 + 4)) & 0xF) + hex_tab.charAt((binarray[i >> 2] >> ((3 - i % 4) * 8)) & 0xF); } return str; } /*
*
* calculate MessageDigest accord to source message that inputted
*
*/
// function calcDigest() { // var digestM = hex_sha1(document.SHAForm.SourceMessage.value); // document.SHAForm.MessageDigest.value = digestM; // }</script>
</body> </html>
调用方法hex_sha1(value)，如下：
var value="brady03161118";
var sha1_result=hex_sha1(value);
console.log(sha1_result)
加密后的结果是：45bc4a15465c7d6026c42fb43c7a11f2f17f59d6