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js 使用sha1加密 以及 JS-SDK使用权限签名算法

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可以使用sha1js函数来转换  也可以使用插件  推荐使用安装插件 

npm install  jshashes

var Hashes = require('jshashes')

// 字符串加密成 hex 字符串

function sha1 (s) {

let data = new Uint8Array(encodeUTF8(s))

let i, j, t

let l = ((data.length + 8) >>> 6 << 4) + 16

let sa = new Uint8Array(l << 2)

sa.set(new Uint8Array(data.buffer))

sa = new Uint32Array(sa.buffer)

for (t = new DataView(sa.buffer), i = 0; i < l; i++) sa[i] = t.getUint32(i << 2)

sa[data.length >> 2] |= 0x80 << (24 - (data.length & 3) * 8)

sa[l - 1] = data.length << 3

let w = []

let f = [

function () {

return m[1] & m[2] | ~m[1] & m[3]

},

function () {

return m[1] ^ m[2] ^ m[3]

},

function () {

return m[1] & m[2] | m[1] & m[3] | m[2] & m[3]

},

function () {

return m[1] ^ m[2] ^ m[3]

}

]

let rol = function (n, c) {

return n << c | n >>> (32 - c)

}

let k = [1518500249, 1859775393, -1894007588, -899497514]

let m = [1732584193, -271733879, null, null, -1009589776]

m[2] = ~m[0]

m[3] = ~m[1]

for (i = 0; i < s.length; i += 16) {

let o = m.slice(0)

for (j = 0; j < 80; j++) {

w[j] = j < 16 ? s[i + j] : rol(w[j - 3] ^ w[j - 8] ^ w[j - 14] ^ w[j - 16], 1)

t = rol(m[0], 5) + f[j / 20 | 0]() + m[4] + w[j] + k[j / 20 | 0] | 0

m[1] = rol(m[1], 30)

m.pop()

m.unshift(t)

}

for (j = 0; j < 5; j++) m[j] = m[j] + o[j] | 0

}

t = new DataView(new Uint32Array(m).buffer)

for (let i = 0; i < 5; i++) m[i] = t.getUint32(i << 2)

 

let hex = Array.prototype.map.call(new Uint8Array(new Uint32Array(m).buffer), function (e) {

return (e < 16 ? '0' : '') + e.toString(16)

}).join('')

return hex

}

function encodeUTF8 (s) {

const code = encodeURIComponent(s)

const bytes = []

for (var i = 0; i < code.length; i++) {

const c = code.charAt(i)

if (c === '%') {

const hex = code.charAt(i + 1) + code.charAt(i + 2)

const hexVal = parseInt(hex, 16)

bytes.push(hexVal)

i += 2

} else bytes.push(c.charCodeAt(0))

}

return bytes

}

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