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#### 项目介绍 类似一个脚手架的工具 此项目致力于构建一套基础，简单，可维护的 适配我司的react-native项目。可在此基础上搭建项目，封装了基础架构，基础组件，以及各种交互等；可快速进行项目搭建，开发。 # 涉及主要技术 - 1. 项目主要架构 * react native * react-navigation * redux
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JavaScript
/* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */
/* SHA-256 implementation in JavaScript (c) Chris Veness 2002-2014 / MIT Licence */
/* */
/* - see http://csrc.nist.gov/groups/ST/toolkit/secure_hashing.html */
/* http://csrc.nist.gov/groups/ST/toolkit/examples.html */
/* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */
/* jshint node:true */ /* global define, escape, unescape */
;
/**
* SHA-256 hash function reference implementation.
*
* @namespace
*/
var Sha256 = {};
/**
* Generates SHA-256 hash of string.
*
* @param {string} msg - String to be hashed
* @returns {string} Hash of msg as hex character string
*/
Sha256.hash = function(msg) {
// convert string to UTF-8, as SHA only deals with byte-streams
msg = msg.utf8Encode();
// constants [§4.2.2]
var K = [
0x428a2f98,
0x71374491,
0xb5c0fbcf,
0xe9b5dba5,
0x3956c25b,
0x59f111f1,
0x923f82a4,
0xab1c5ed5,
0xd807aa98,
0x12835b01,
0x243185be,
0x550c7dc3,
0x72be5d74,
0x80deb1fe,
0x9bdc06a7,
0xc19bf174,
0xe49b69c1,
0xefbe4786,
0x0fc19dc6,
0x240ca1cc,
0x2de92c6f,
0x4a7484aa,
0x5cb0a9dc,
0x76f988da,
0x983e5152,
0xa831c66d,
0xb00327c8,
0xbf597fc7,
0xc6e00bf3,
0xd5a79147,
0x06ca6351,
0x14292967,
0x27b70a85,
0x2e1b2138,
0x4d2c6dfc,
0x53380d13,
0x650a7354,
0x766a0abb,
0x81c2c92e,
0x92722c85,
0xa2bfe8a1,
0xa81a664b,
0xc24b8b70,
0xc76c51a3,
0xd192e819,
0xd6990624,
0xf40e3585,
0x106aa070,
0x19a4c116,
0x1e376c08,
0x2748774c,
0x34b0bcb5,
0x391c0cb3,
0x4ed8aa4a,
0x5b9cca4f,
0x682e6ff3,
0x748f82ee,
0x78a5636f,
0x84c87814,
0x8cc70208,
0x90befffa,
0xa4506ceb,
0xbef9a3f7,
0xc67178f2,
];
// initial hash value [§5.3.1]
var H = [
0x6a09e667,
0xbb67ae85,
0x3c6ef372,
0xa54ff53a,
0x510e527f,
0x9b05688c,
0x1f83d9ab,
0x5be0cd19,
];
// PREPROCESSING
msg += String.fromCharCode(0x80); // add trailing '1' bit (+ 0's padding) to string [§5.1.1]
// convert string msg into 512-bit/16-integer blocks arrays of ints [§5.2.1]
var l = msg.length / 4 + 2; // length (in 32-bit integers) of msg + ‘1’ + appended length
var N = Math.ceil(l / 16); // number of 16-integer-blocks required to hold 'l' ints
var M = new Array(N);
for (var i = 0; i < N; i++) {
M[i] = new Array(16);
for (var j = 0; j < 16; j++) {
// encode 4 chars per integer, big-endian encoding
M[i][j] =
(msg.charCodeAt(i * 64 + j * 4) << 24) |
(msg.charCodeAt(i * 64 + j * 4 + 1) << 16) |
(msg.charCodeAt(i * 64 + j * 4 + 2) << 8) |
msg.charCodeAt(i * 64 + j * 4 + 3);
} // note running off the end of msg is ok 'cos bitwise ops on NaN return 0
}
// add length (in bits) into final pair of 32-bit integers (big-endian) [§5.1.1]
// note: most significant word would be (len-1)*8 >>> 32, but since JS converts
// bitwise-op args to 32 bits, we need to simulate this by arithmetic operators
M[N - 1][14] = ((msg.length - 1) * 8) / Math.pow(2, 32);
M[N - 1][14] = Math.floor(M[N - 1][14]);
M[N - 1][15] = ((msg.length - 1) * 8) & 0xffffffff;
// HASH COMPUTATION [§6.1.2]
var W = new Array(64);
var a, b, c, d, e, f, g, h;
for (var i = 0; i < N; i++) {
// 1 - prepare message schedule 'W'
for (var t = 0; t < 16; t++) W[t] = M[i][t];
for (var t = 16; t < 64; t++)
W[t] =
(Sha256.σ1(W[t - 2]) + W[t - 7] + Sha256.σ0(W[t - 15]) + W[t - 16]) &
0xffffffff;
// 2 - initialise working variables a, b, c, d, e, f, g, h with previous hash value
a = H[0];
b = H[1];
c = H[2];
d = H[3];
e = H[4];
f = H[5];
g = H[6];
h = H[7];
// 3 - main loop (note 'addition modulo 2^32')
for (var t = 0; t < 64; t++) {
var T1 = h + Sha256.Σ1(e) + Sha256.Ch(e, f, g) + K[t] + W[t];
var T2 = Sha256.Σ0(a) + Sha256.Maj(a, b, c);
h = g;
g = f;
f = e;
e = (d + T1) & 0xffffffff;
d = c;
c = b;
b = a;
a = (T1 + T2) & 0xffffffff;
}
// 4 - compute the new intermediate hash value (note 'addition modulo 2^32')
H[0] = (H[0] + a) & 0xffffffff;
H[1] = (H[1] + b) & 0xffffffff;
H[2] = (H[2] + c) & 0xffffffff;
H[3] = (H[3] + d) & 0xffffffff;
H[4] = (H[4] + e) & 0xffffffff;
H[5] = (H[5] + f) & 0xffffffff;
H[6] = (H[6] + g) & 0xffffffff;
H[7] = (H[7] + h) & 0xffffffff;
}
return (
Sha256.toHexStr(H[0]) +
Sha256.toHexStr(H[1]) +
Sha256.toHexStr(H[2]) +
Sha256.toHexStr(H[3]) +
Sha256.toHexStr(H[4]) +
Sha256.toHexStr(H[5]) +
Sha256.toHexStr(H[6]) +
Sha256.toHexStr(H[7])
);
};
/**
* Rotates right (circular right shift) value x by n positions [§3.2.4].
* @private
*/
Sha256.ROTR = function(n, x) {
return (x >>> n) | (x << (32 - n));
};
/**
* Logical functions [§4.1.2].
* @private
*/
Sha256.Σ0 = function(x) {
return Sha256.ROTR(2, x) ^ Sha256.ROTR(13, x) ^ Sha256.ROTR(22, x);
};
Sha256.Σ1 = function(x) {
return Sha256.ROTR(6, x) ^ Sha256.ROTR(11, x) ^ Sha256.ROTR(25, x);
};
Sha256.σ0 = function(x) {
return Sha256.ROTR(7, x) ^ Sha256.ROTR(18, x) ^ (x >>> 3);
};
Sha256.σ1 = function(x) {
return Sha256.ROTR(17, x) ^ Sha256.ROTR(19, x) ^ (x >>> 10);
};
Sha256.Ch = function(x, y, z) {
return (x & y) ^ (~x & z);
};
Sha256.Maj = function(x, y, z) {
return (x & y) ^ (x & z) ^ (y & z);
};
/**
* Hexadecimal representation of a number.
* @private
*/
Sha256.toHexStr = function(n) {
// note can't use toString(16) as it is implementation-dependant,
// and in IE returns signed numbers when used on full words
var s = '',
v;
for (var i = 7; i >= 0; i--) {
v = (n >>> (i * 4)) & 0xf;
s += v.toString(16);
}
return s;
};
/* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */
/** Extend String object with method to encode multi-byte string to utf8
* - monsur.hossa.in/2012/07/20/utf-8-in-javascript.html */
if (typeof String.prototype.utf8Encode == 'undefined') {
String.prototype.utf8Encode = function() {
return unescape(encodeURIComponent(this));
};
}
/** Extend String object with method to decode utf8 string to multi-byte */
if (typeof String.prototype.utf8Decode == 'undefined') {
String.prototype.utf8Decode = function() {
try {
return decodeURIComponent(escape(this));
} catch (e) {
return this; // invalid UTF-8? return as-is
}
};
}
/* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */
if (typeof module != 'undefined' && module.exports) module.exports = Sha256; // CommonJs export
if (typeof define == 'function' && define.amd)
define([], function() {
return Sha256;
}); // AMD