JavaScript SHA-256加密算法详细代码

 /* * A JavaScript implementation of the Secure Hash Algorithm, SHA-256, as defined * in FIPS 180-2 * Version 2.2 Copyright Angel Marin, Paul Johnston 2000 - 2009. * Other contributors: Greg Holt, Andrew Kepert, Ydnar, Lostinet * Distributed under the BSD License * See http://pajhome.org.uk/crypt/md5 for details. * Also http://anmar.eu.org/projects/jssha2/ */ /* * 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 - lowercase; 1 - uppercase    */ var b64pad = ""; /* base-64 pad character. "=" for strict RFC compliance  */ /* * 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_sha256(s)  { return rstr2hex(rstr_sha256(str2rstr_utf8(s))); } function b64_sha256(s)  { return rstr2b64(rstr_sha256(str2rstr_utf8(s))); } function any_sha256(s, e) { return rstr2any(rstr_sha256(str2rstr_utf8(s)), e); } function hex_hmac_sha256(k, d) { return rstr2hex(rstr_hmac_sha256(str2rstr_utf8(k), str2rstr_utf8(d))); } function b64_hmac_sha256(k, d) { return rstr2b64(rstr_hmac_sha256(str2rstr_utf8(k), str2rstr_utf8(d))); } function any_hmac_sha256(k, d, e) { return rstr2any(rstr_hmac_sha256(str2rstr_utf8(k), str2rstr_utf8(d)), e); } /* * Perform a simple self-test to see if the VM is working */ function sha256_vm_test() { return hex_sha256("abc").toLowerCase() == "ba7816bf8f01cfea414140de5dae2223b00361a396177a9cb410ff61f20015ad"; } /* * Calculate the sha256 of a raw string */ function rstr_sha256(s) { return binb2rstr(binb_sha256(rstr2binb(s), s.length * 8)); } /* * Calculate the HMAC-sha256 of a key and some data (raw strings) */ function rstr_hmac_sha256(key, data) { var bkey = rstr2binb(key); if(bkey.length > 16) bkey = binb_sha256(bkey, key.length * 8); var ipad = Array(16), opad = Array(16); for(var i = 0; i <16; i++) { ipad[i] = bkey[i] ^ 0x36363636; opad[i] = bkey[i] ^ 0x5C5C5C5C; } var hash = binb_sha256(ipad.concat(rstr2binb(data)), 512 + data.length * 8); return binb2rstr(binb_sha256(opad.concat(hash), 512 + 256)); } /* * Convert a raw string to a hex string */ function rstr2hex(input) { try { hexcase } catch(e) { hexcase=0; } var hex_tab = hexcase ? "0123456789ABCDEF" : "0123456789abcdef"; var output = ""; var x; for(var i = 0; i >> 4) & 0x0F) + hex_tab.charAt( x    & 0x0F); } return output; } /* * Convert a raw string to a base-64 string */ function rstr2b64(input) { try { b64pad } catch(e) { b64pad=''; } var tab = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/"; var output = ""; var len = input.length; for(var i = 0; i  input.length * 8) output += b64pad; else output += tab.charAt((triplet >>> 6*(3-j)) & 0x3F); } } return output; } /* * Convert a raw string to an arbitrary string encoding */ function rstr2any(input, encoding) { var divisor = encoding.length; var remainders = Array(); var i, q, x, quotient; /* Convert to an array of 16-bit big-endian values, forming the dividend */ var dividend = Array(Math.ceil(input.length / 2)); for(i = 0; i  0) { quotient = Array(); x = 0; for(i = 0; i  0 || q > 0) quotient[quotient.length] = q; } remainders[remainders.length] = x; dividend = quotient; } /* Convert the remainders to the output string */ var output = ""; for(i = remainders.length - 1; i >= 0; i--) output += encoding.charAt(remainders[i]); /* Append leading zero equivalents */ var full_length = Math.ceil(input.length * 8 / (Math.log(encoding.length) / Math.log(2))) for(i = output.length; i >> 6 ) & 0x1F), 0x80 | ( x     & 0x3F)); else if(x <= 0xFFFF) output += String.fromCharCode(0xE0 | ((x >>> 12) & 0x0F), 0x80 | ((x >>> 6 ) & 0x3F), 0x80 | ( x     & 0x3F)); else if(x <= 0x1FFFFF) output += String.fromCharCode(0xF0 | ((x >>> 18) & 0x07), 0x80 | ((x >>> 12) & 0x3F), 0x80 | ((x >>> 6 ) & 0x3F), 0x80 | ( x     & 0x3F)); } return output; } /* * Encode a string as utf-16 */ function str2rstr_utf16le(input) { var output = ""; for(var i = 0; i >> 8) & 0xFF); return output; } function str2rstr_utf16be(input) { var output = ""; for(var i = 0; i >> 8) & 0xFF, input.charCodeAt(i)    & 0xFF); return output; } /* * Convert a raw string to an array of big-endian words * Characters >255 have their high-byte silently ignored. */ function rstr2binb(input) { var output = Array(input.length >> 2); for(var i = 0; i >5] |= (input.charCodeAt(i / 8) & 0xFF) << (24 - i % 32); return output; } /* * Convert an array of big-endian words to a string */ function binb2rstr(input) { var output = ""; for(var i = 0; i >5] >>> (24 - i % 32)) & 0xFF); return output; } /* * Main sha256 function, with its support functions */ function sha256_S (X, n) {return ( X >>> n ) | (X << (32 - n));} function sha256_R (X, n) {return ( X >>> n );} function sha256_Ch(x, y, z) {return ((x & y) ^ ((~x) & z));} function sha256_Maj(x, y, z) {return ((x & y) ^ (x & z) ^ (y & z));} function sha256_Sigma0256(x) {return (sha256_S(x, 2) ^ sha256_S(x, 13) ^ sha256_S(x, 22));} function sha256_Sigma1256(x) {return (sha256_S(x, 6) ^ sha256_S(x, 11) ^ sha256_S(x, 25));} function sha256_Gamma0256(x) {return (sha256_S(x, 7) ^ sha256_S(x, 18) ^ sha256_R(x, 3));} function sha256_Gamma1256(x) {return (sha256_S(x, 17) ^ sha256_S(x, 19) ^ sha256_R(x, 10));} function sha256_Sigma0512(x) {return (sha256_S(x, 28) ^ sha256_S(x, 34) ^ sha256_S(x, 39));} function sha256_Sigma1512(x) {return (sha256_S(x, 14) ^ sha256_S(x, 18) ^ sha256_S(x, 41));} function sha256_Gamma0512(x) {return (sha256_S(x, 1) ^ sha256_S(x, 8) ^ sha256_R(x, 7));} function sha256_Gamma1512(x) {return (sha256_S(x, 19) ^ sha256_S(x, 61) ^ sha256_R(x, 6));} var sha256_K = new Array ( 1116352408, 1899447441, -1245643825, -373957723, 961987163, 1508970993, -1841331548, -1424204075, -670586216, 310598401, 607225278, 1426881987, 1925078388, -2132889090, -1680079193, -1046744716, -459576895, -272742522, 264347078, 604807628, 770255983, 1249150122, 1555081692, 1996064986, -1740746414, -1473132947, -1341970488, -1084653625, -958395405, -710438585, 113926993, 338241895, 666307205, 773529912, 1294757372, 1396182291, 1695183700, 1986661051, -2117940946, -1838011259, -1564481375, -1474664885, -1035236496, -949202525, -778901479, -694614492, -200395387, 275423344, 430227734, 506948616, 659060556, 883997877, 958139571, 1322822218, 1537002063, 1747873779, 1955562222, 2024104815, -2067236844, -1933114872, -1866530822, -1538233109, -1090935817, -965641998 ); function binb_sha256(m, l) { var HASH = new Array(1779033703, -1150833019, 1013904242, -1521486534, 1359893119, -1694144372, 528734635, 1541459225); var W = new Array(64); var a, b, c, d, e, f, g, h; var i, j, T1, T2; /* append padding */ m[l >> 5] |= 0x80 << (24 - l % 32); m[((l + 64 >> 9) << 4) + 15] = l; for(i = 0; i > 16) + (y >> 16) + (lsw >> 16); return (msw << 16) | (lsw & 0xFFFF); }