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58 lines
1.8 KiB
58 lines
1.8 KiB
var crypto = require("crypto"); |
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var BigInteger = require("jsbn").BigInteger; |
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var ECPointFp = require("./lib/ec.js").ECPointFp; |
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var Buffer = require("safer-buffer").Buffer; |
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exports.ECCurves = require("./lib/sec.js"); |
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// zero prepad |
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function unstupid(hex,len) |
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{ |
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return (hex.length >= len) ? hex : unstupid("0"+hex,len); |
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} |
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exports.ECKey = function(curve, key, isPublic) |
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{ |
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var priv; |
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var c = curve(); |
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var n = c.getN(); |
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var bytes = Math.floor(n.bitLength()/8); |
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if(key) |
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{ |
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if(isPublic) |
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{ |
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var curve = c.getCurve(); |
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// var x = key.slice(1,bytes+1); // skip the 04 for uncompressed format |
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// var y = key.slice(bytes+1); |
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// this.P = new ECPointFp(curve, |
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// curve.fromBigInteger(new BigInteger(x.toString("hex"), 16)), |
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// curve.fromBigInteger(new BigInteger(y.toString("hex"), 16))); |
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this.P = curve.decodePointHex(key.toString("hex")); |
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}else{ |
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if(key.length != bytes) return false; |
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priv = new BigInteger(key.toString("hex"), 16); |
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} |
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}else{ |
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var n1 = n.subtract(BigInteger.ONE); |
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var r = new BigInteger(crypto.randomBytes(n.bitLength())); |
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priv = r.mod(n1).add(BigInteger.ONE); |
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this.P = c.getG().multiply(priv); |
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} |
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if(this.P) |
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{ |
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// var pubhex = unstupid(this.P.getX().toBigInteger().toString(16),bytes*2)+unstupid(this.P.getY().toBigInteger().toString(16),bytes*2); |
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// this.PublicKey = Buffer.from("04"+pubhex,"hex"); |
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this.PublicKey = Buffer.from(c.getCurve().encodeCompressedPointHex(this.P),"hex"); |
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} |
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if(priv) |
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{ |
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this.PrivateKey = Buffer.from(unstupid(priv.toString(16),bytes*2),"hex"); |
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this.deriveSharedSecret = function(key) |
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{ |
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if(!key || !key.P) return false; |
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var S = key.P.multiply(priv); |
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return Buffer.from(unstupid(S.getX().toBigInteger().toString(16),bytes*2),"hex"); |
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} |
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} |
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} |
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