75 lines
1.5 KiB
JavaScript
75 lines
1.5 KiB
JavaScript
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'use strict';
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var utils = require('../utils');
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var common = require('../common');
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var shaCommon = require('./common');
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var rotl32 = utils.rotl32;
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var sum32 = utils.sum32;
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var sum32_5 = utils.sum32_5;
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var ft_1 = shaCommon.ft_1;
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var BlockHash = common.BlockHash;
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var sha1_K = [
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0x5A827999, 0x6ED9EBA1,
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0x8F1BBCDC, 0xCA62C1D6
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];
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function SHA1() {
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if (!(this instanceof SHA1))
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return new SHA1();
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BlockHash.call(this);
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this.h = [
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0x67452301, 0xefcdab89, 0x98badcfe,
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0x10325476, 0xc3d2e1f0 ];
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this.W = new Array(80);
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}
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utils.inherits(SHA1, BlockHash);
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module.exports = SHA1;
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SHA1.blockSize = 512;
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SHA1.outSize = 160;
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SHA1.hmacStrength = 80;
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SHA1.padLength = 64;
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SHA1.prototype._update = function _update(msg, start) {
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var W = this.W;
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for (var i = 0; i < 16; i++)
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W[i] = msg[start + i];
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for(; i < W.length; i++)
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W[i] = rotl32(W[i - 3] ^ W[i - 8] ^ W[i - 14] ^ W[i - 16], 1);
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var a = this.h[0];
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var b = this.h[1];
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var c = this.h[2];
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var d = this.h[3];
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var e = this.h[4];
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for (i = 0; i < W.length; i++) {
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var s = ~~(i / 20);
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var t = sum32_5(rotl32(a, 5), ft_1(s, b, c, d), e, W[i], sha1_K[s]);
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e = d;
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d = c;
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c = rotl32(b, 30);
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b = a;
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a = t;
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}
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this.h[0] = sum32(this.h[0], a);
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this.h[1] = sum32(this.h[1], b);
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this.h[2] = sum32(this.h[2], c);
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this.h[3] = sum32(this.h[3], d);
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this.h[4] = sum32(this.h[4], e);
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};
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SHA1.prototype._digest = function digest(enc) {
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if (enc === 'hex')
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return utils.toHex32(this.h, 'big');
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else
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return utils.split32(this.h, 'big');
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};
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