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337 lines
10 KiB
337 lines
10 KiB
/* |
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* A JavaScript implementation of the Secure Hash Algorithm, SHA-256, as defined |
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* in FIPS 180-2 |
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* Version 2.2 Copyright Angel Marin, Paul Johnston 2000 - 2009. |
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* Other contributors: Greg Holt, Andrew Kepert, Ydnar, Lostinet |
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* Distributed under the BSD License |
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* See http://pajhome.org.uk/crypt/md5 for details. |
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* Also http://anmar.eu.org/projects/jssha2/ |
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*/ |
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/* |
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* Configurable variables. You may need to tweak these to be compatible with |
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* the server-side, but the defaults work in most cases. |
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*/ |
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var hexcase = 0; /* hex output format. 0 - lowercase; 1 - uppercase */ |
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var b64pad = ""; /* base-64 pad character. "=" for strict RFC compliance */ |
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/* |
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* These are the functions you'll usually want to call |
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* They take string arguments and return either hex or base-64 encoded strings |
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*/ |
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function hex_sha256(s) { return rstr2hex(rstr_sha256(str2rstr_utf8(s))); } |
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function b64_sha256(s) { return rstr2b64(rstr_sha256(str2rstr_utf8(s))); } |
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function any_sha256(s, e) { return rstr2any(rstr_sha256(str2rstr_utf8(s)), e); } |
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function hex_hmac_sha256(k, d) |
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{ return rstr2hex(rstr_hmac_sha256(str2rstr_utf8(k), str2rstr_utf8(d))); } |
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function b64_hmac_sha256(k, d) |
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{ return rstr2b64(rstr_hmac_sha256(str2rstr_utf8(k), str2rstr_utf8(d))); } |
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function any_hmac_sha256(k, d, e) |
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{ return rstr2any(rstr_hmac_sha256(str2rstr_utf8(k), str2rstr_utf8(d)), e); } |
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/* |
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* Perform a simple self-test to see if the VM is working |
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*/ |
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function sha256_vm_test() |
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{ |
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return hex_sha256("abc").toLowerCase() == |
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"ba7816bf8f01cfea414140de5dae2223b00361a396177a9cb410ff61f20015ad"; |
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} |
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/* |
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* Calculate the sha256 of a raw string |
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*/ |
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function rstr_sha256(s) |
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{ |
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return binb2rstr(binb_sha256(rstr2binb(s), s.length * 8)); |
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} |
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/* |
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* Calculate the HMAC-sha256 of a key and some data (raw strings) |
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*/ |
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function rstr_hmac_sha256(key, data) |
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{ |
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var bkey = rstr2binb(key); |
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if(bkey.length > 16) bkey = binb_sha256(bkey, key.length * 8); |
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var ipad = Array(16), opad = Array(16); |
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for(var i = 0; i < 16; i++) |
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{ |
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ipad[i] = bkey[i] ^ 0x36363636; |
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opad[i] = bkey[i] ^ 0x5C5C5C5C; |
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} |
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var hash = binb_sha256(ipad.concat(rstr2binb(data)), 512 + data.length * 8); |
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return binb2rstr(binb_sha256(opad.concat(hash), 512 + 256)); |
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} |
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/* |
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* Convert a raw string to a hex string |
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*/ |
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function rstr2hex(input) |
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{ |
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try { hexcase } catch(e) { hexcase=0; } |
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var hex_tab = hexcase ? "0123456789ABCDEF" : "0123456789abcdef"; |
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var output = ""; |
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var x; |
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for(var i = 0; i < input.length; i++) |
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{ |
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x = input.charCodeAt(i); |
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output += hex_tab.charAt((x >>> 4) & 0x0F) |
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+ hex_tab.charAt( x & 0x0F); |
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} |
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return output; |
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} |
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/* |
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* Convert a raw string to a base-64 string |
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*/ |
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function rstr2b64(input) |
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{ |
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try { b64pad } catch(e) { b64pad=''; } |
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var tab = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/"; |
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var output = ""; |
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var len = input.length; |
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for(var i = 0; i < len; i += 3) |
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{ |
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var triplet = (input.charCodeAt(i) << 16) |
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| (i + 1 < len ? input.charCodeAt(i+1) << 8 : 0) |
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| (i + 2 < len ? input.charCodeAt(i+2) : 0); |
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for(var j = 0; j < 4; j++) |
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{ |
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if(i * 8 + j * 6 > input.length * 8) output += b64pad; |
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else output += tab.charAt((triplet >>> 6*(3-j)) & 0x3F); |
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} |
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} |
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return output; |
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} |
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/* |
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* Convert a raw string to an arbitrary string encoding |
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*/ |
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function rstr2any(input, encoding) |
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{ |
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var divisor = encoding.length; |
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var remainders = Array(); |
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var i, q, x, quotient; |
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/* Convert to an array of 16-bit big-endian values, forming the dividend */ |
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var dividend = Array(Math.ceil(input.length / 2)); |
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for(i = 0; i < dividend.length; i++) |
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{ |
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dividend[i] = (input.charCodeAt(i * 2) << 8) | input.charCodeAt(i * 2 + 1); |
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} |
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/* |
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* Repeatedly perform a long division. The binary array forms the dividend, |
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* the length of the encoding is the divisor. Once computed, the quotient |
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* forms the dividend for the next step. We stop when the dividend is zero. |
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* All remainders are stored for later use. |
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*/ |
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while(dividend.length > 0) |
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{ |
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quotient = Array(); |
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x = 0; |
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for(i = 0; i < dividend.length; i++) |
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{ |
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x = (x << 16) + dividend[i]; |
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q = Math.floor(x / divisor); |
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x -= q * divisor; |
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if(quotient.length > 0 || q > 0) |
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quotient[quotient.length] = q; |
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} |
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remainders[remainders.length] = x; |
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dividend = quotient; |
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} |
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/* Convert the remainders to the output string */ |
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var output = ""; |
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for(i = remainders.length - 1; i >= 0; i--) |
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output += encoding.charAt(remainders[i]); |
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/* Append leading zero equivalents */ |
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var full_length = Math.ceil(input.length * 8 / |
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(Math.log(encoding.length) / Math.log(2))) |
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for(i = output.length; i < full_length; i++) |
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output = encoding[0] + output; |
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return output; |
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} |
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/* |
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* Encode a string as utf-8. |
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* For efficiency, this assumes the input is valid utf-16. |
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*/ |
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function str2rstr_utf8(input) |
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{ |
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var output = ""; |
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var i = -1; |
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var x, y; |
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while(++i < input.length) |
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{ |
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/* Decode utf-16 surrogate pairs */ |
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x = input.charCodeAt(i); |
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y = i + 1 < input.length ? input.charCodeAt(i + 1) : 0; |
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if(0xD800 <= x && x <= 0xDBFF && 0xDC00 <= y && y <= 0xDFFF) |
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{ |
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x = 0x10000 + ((x & 0x03FF) << 10) + (y & 0x03FF); |
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i++; |
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} |
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/* Encode output as utf-8 */ |
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if(x <= 0x7F) |
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output += String.fromCharCode(x); |
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else if(x <= 0x7FF) |
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output += String.fromCharCode(0xC0 | ((x >>> 6 ) & 0x1F), |
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0x80 | ( x & 0x3F)); |
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else if(x <= 0xFFFF) |
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output += String.fromCharCode(0xE0 | ((x >>> 12) & 0x0F), |
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0x80 | ((x >>> 6 ) & 0x3F), |
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0x80 | ( x & 0x3F)); |
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else if(x <= 0x1FFFFF) |
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output += String.fromCharCode(0xF0 | ((x >>> 18) & 0x07), |
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0x80 | ((x >>> 12) & 0x3F), |
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0x80 | ((x >>> 6 ) & 0x3F), |
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0x80 | ( x & 0x3F)); |
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} |
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return output; |
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} |
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/* |
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* Encode a string as utf-16 |
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*/ |
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function str2rstr_utf16le(input) |
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{ |
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var output = ""; |
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for(var i = 0; i < input.length; i++) |
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output += String.fromCharCode( input.charCodeAt(i) & 0xFF, |
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(input.charCodeAt(i) >>> 8) & 0xFF); |
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return output; |
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} |
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function str2rstr_utf16be(input) |
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{ |
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var output = ""; |
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for(var i = 0; i < input.length; i++) |
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output += String.fromCharCode((input.charCodeAt(i) >>> 8) & 0xFF, |
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input.charCodeAt(i) & 0xFF); |
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return output; |
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} |
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/* |
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* Convert a raw string to an array of big-endian words |
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* Characters >255 have their high-byte silently ignored. |
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*/ |
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function rstr2binb(input) |
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{ |
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var output = Array(input.length >> 2); |
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for(var i = 0; i < output.length; i++) |
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output[i] = 0; |
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for(var i = 0; i < input.length * 8; i += 8) |
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output[i>>5] |= (input.charCodeAt(i / 8) & 0xFF) << (24 - i % 32); |
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return output; |
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} |
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/* |
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* Convert an array of big-endian words to a string |
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*/ |
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function binb2rstr(input) |
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{ |
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var output = ""; |
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for(var i = 0; i < input.length * 32; i += 8) |
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output += String.fromCharCode((input[i>>5] >>> (24 - i % 32)) & 0xFF); |
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return output; |
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} |
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/* |
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* Main sha256 function, with its support functions |
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*/ |
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function sha256_S (X, n) {return ( X >>> n ) | (X << (32 - n));} |
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function sha256_R (X, n) {return ( X >>> n );} |
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function sha256_Ch(x, y, z) {return ((x & y) ^ ((~x) & z));} |
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function sha256_Maj(x, y, z) {return ((x & y) ^ (x & z) ^ (y & z));} |
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function sha256_Sigma0256(x) {return (sha256_S(x, 2) ^ sha256_S(x, 13) ^ sha256_S(x, 22));} |
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function sha256_Sigma1256(x) {return (sha256_S(x, 6) ^ sha256_S(x, 11) ^ sha256_S(x, 25));} |
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function sha256_Gamma0256(x) {return (sha256_S(x, 7) ^ sha256_S(x, 18) ^ sha256_R(x, 3));} |
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function sha256_Gamma1256(x) {return (sha256_S(x, 17) ^ sha256_S(x, 19) ^ sha256_R(x, 10));} |
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function sha256_Sigma0512(x) {return (sha256_S(x, 28) ^ sha256_S(x, 34) ^ sha256_S(x, 39));} |
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function sha256_Sigma1512(x) {return (sha256_S(x, 14) ^ sha256_S(x, 18) ^ sha256_S(x, 41));} |
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function sha256_Gamma0512(x) {return (sha256_S(x, 1) ^ sha256_S(x, 8) ^ sha256_R(x, 7));} |
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function sha256_Gamma1512(x) {return (sha256_S(x, 19) ^ sha256_S(x, 61) ^ sha256_R(x, 6));} |
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var sha256_K = new Array |
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( |
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1116352408, 1899447441, -1245643825, -373957723, 961987163, 1508970993, |
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-1841331548, -1424204075, -670586216, 310598401, 607225278, 1426881987, |
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1925078388, -2132889090, -1680079193, -1046744716, -459576895, -272742522, |
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264347078, 604807628, 770255983, 1249150122, 1555081692, 1996064986, |
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-1740746414, -1473132947, -1341970488, -1084653625, -958395405, -710438585, |
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113926993, 338241895, 666307205, 773529912, 1294757372, 1396182291, |
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1695183700, 1986661051, -2117940946, -1838011259, -1564481375, -1474664885, |
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-1035236496, -949202525, -778901479, -694614492, -200395387, 275423344, |
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430227734, 506948616, 659060556, 883997877, 958139571, 1322822218, |
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1537002063, 1747873779, 1955562222, 2024104815, -2067236844, -1933114872, |
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-1866530822, -1538233109, -1090935817, -965641998 |
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); |
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function binb_sha256(m, l) |
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{ |
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var HASH = new Array(1779033703, -1150833019, 1013904242, -1521486534, |
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1359893119, -1694144372, 528734635, 1541459225); |
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var W = new Array(64); |
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var a, b, c, d, e, f, g, h; |
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var i, j, T1, T2; |
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/* append padding */ |
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m[l >> 5] |= 0x80 << (24 - l % 32); |
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m[((l + 64 >> 9) << 4) + 15] = l; |
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for(i = 0; i < m.length; i += 16) |
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{ |
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a = HASH[0]; |
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b = HASH[1]; |
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c = HASH[2]; |
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d = HASH[3]; |
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e = HASH[4]; |
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f = HASH[5]; |
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g = HASH[6]; |
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h = HASH[7]; |
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for(j = 0; j < 64; j++) |
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{ |
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if (j < 16) W[j] = m[j + i]; |
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else W[j] = safe_add(safe_add(safe_add(sha256_Gamma1256(W[j - 2]), W[j - 7]), |
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sha256_Gamma0256(W[j - 15])), W[j - 16]); |
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T1 = safe_add(safe_add(safe_add(safe_add(h, sha256_Sigma1256(e)), sha256_Ch(e, f, g)), |
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sha256_K[j]), W[j]); |
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T2 = safe_add(sha256_Sigma0256(a), sha256_Maj(a, b, c)); |
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h = g; |
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g = f; |
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f = e; |
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e = safe_add(d, T1); |
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d = c; |
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c = b; |
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b = a; |
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a = safe_add(T1, T2); |
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} |
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HASH[0] = safe_add(a, HASH[0]); |
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HASH[1] = safe_add(b, HASH[1]); |
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HASH[2] = safe_add(c, HASH[2]); |
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HASH[3] = safe_add(d, HASH[3]); |
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HASH[4] = safe_add(e, HASH[4]); |
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HASH[5] = safe_add(f, HASH[5]); |
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HASH[6] = safe_add(g, HASH[6]); |
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HASH[7] = safe_add(h, HASH[7]); |
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} |
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return HASH; |
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} |
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function safe_add (x, y) |
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{ |
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var lsw = (x & 0xFFFF) + (y & 0xFFFF); |
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var msw = (x >> 16) + (y >> 16) + (lsw >> 16); |
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return (msw << 16) | (lsw & 0xFFFF); |
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}
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