85 lines
2.5 KiB
JavaScript
85 lines
2.5 KiB
JavaScript
// Named EC curves
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var BigInteger = require('bigi')
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var ECCurveFp = require('./ec')
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var ECPointFp = ECCurveFp.ECPointFp
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// ----------------
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// X9ECParameters
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// constructor
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function X9ECParameters(curve,g,n,h) {
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this.curve = curve
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this.g = g
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this.n = n
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this.h = h
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}
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function x9getCurve() {
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return this.curve
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}
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function x9getG() {
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return this.g
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}
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function x9getN() {
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return this.n
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}
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function x9getH() {
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return this.h
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}
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X9ECParameters.prototype.getCurve = x9getCurve
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X9ECParameters.prototype.getG = x9getG
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X9ECParameters.prototype.getN = x9getN
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X9ECParameters.prototype.getH = x9getH
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function secp256r1() {
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// p = 2^224 (2^32 - 1) + 2^192 + 2^96 - 1
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var p = BigInteger.fromHex("FFFFFFFF00000001000000000000000000000000FFFFFFFFFFFFFFFFFFFFFFFF")
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var a = BigInteger.fromHex("FFFFFFFF00000001000000000000000000000000FFFFFFFFFFFFFFFFFFFFFFFC")
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var b = BigInteger.fromHex("5AC635D8AA3A93E7B3EBBD55769886BC651D06B0CC53B0F63BCE3C3E27D2604B")
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//byte[] S = BigInteger.fromHex("C49D360886E704936A6678E1139D26B7819F7E90")
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var n = BigInteger.fromHex("FFFFFFFF00000000FFFFFFFFFFFFFFFFBCE6FAADA7179E84F3B9CAC2FC632551")
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var h = BigInteger.ONE
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var curve = new ECCurveFp(p, a, b)
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var x = BigInteger.fromHex("6B17D1F2E12C4247F8BCE6E563A440F277037D812DEB33A0F4A13945D898C296")
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var y = BigInteger.fromHex("4FE342E2FE1A7F9B8EE7EB4A7C0F9E162BCE33576B315ECECBB6406837BF51F5")
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var G = new ECPointFp(curve,
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curve.fromBigInteger(x),
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curve.fromBigInteger(y))
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return new X9ECParameters(curve, G, n, h)
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}
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function secp256k1() {
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// p = 2^256 - 2^32 - 2^9 - 2^8 - 2^7 - 2^6 - 2^4 - 1
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var p = BigInteger.fromHex("FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFEFFFFFC2F")
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var a = BigInteger.ZERO
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var b = BigInteger.fromHex("07")
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//byte[] S = null
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var n = BigInteger.fromHex("FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFEBAAEDCE6AF48A03BBFD25E8CD0364141")
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var h = BigInteger.ONE
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var curve = new ECCurveFp(p, a, b)
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var x = BigInteger.fromHex("79BE667EF9DCBBAC55A06295CE870B07029BFCDB2DCE28D959F2815B16F81798")
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var y = BigInteger.fromHex("483ADA7726A3C4655DA4FBFC0E1108A8FD17B448A68554199C47D08FFB10D4B8")
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var G = new ECPointFp(curve,
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curve.fromBigInteger(x),
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curve.fromBigInteger(y))
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return new X9ECParameters(curve, G, n, h)
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}
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function getSECCurveByName(name) {
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return ({
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"secp256k1": secp256k1,
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"secp256r1": secp256r1
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}[name])()
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}
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module.exports = getSECCurveByName
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