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64 lines
2.4 KiB
Go
Executable file
64 lines
2.4 KiB
Go
Executable file
package elliptic
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/*
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This file was originally made by vsergeev.
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Modifications have been made under the MIT license.
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License: MIT
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*/
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import (
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"math/big"
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)
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var curve Curve
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type curveType string
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const (
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// Secp256r1 curve type
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Secp256r1 curveType = "Secp256r1"
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// Secp256k1 curve type
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Secp256k1 curveType = "Secp256k1"
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)
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// SetCurveSecp256r1 Will set the curve parameters to match Secp256r1
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func (ChosenCurve *Curve) SetCurveSecp256r1() {
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ChosenCurve.P, _ = new(big.Int).SetString("FFFFFFFF00000001000000000000000000000000FFFFFFFFFFFFFFFFFFFFFFFF", 16) //Q
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ChosenCurve.A, _ = new(big.Int).SetString("FFFFFFFF00000001000000000000000000000000FFFFFFFFFFFFFFFFFFFFFFFC", 16)
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ChosenCurve.B, _ = new(big.Int).SetString("5AC635D8AA3A93E7B3EBBD55769886BC651D06B0CC53B0F63BCE3C3E27D2604B", 16)
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ChosenCurve.G.X, _ = new(big.Int).SetString("6B17D1F2E12C4247F8BCE6E563A440F277037D812DEB33A0F4A13945D898C296", 16)
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ChosenCurve.G.Y, _ = new(big.Int).SetString("4FE342E2FE1A7F9B8EE7EB4A7C0F9E162BCE33576B315ECECBB6406837BF51F5", 16)
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ChosenCurve.N, _ = new(big.Int).SetString("FFFFFFFF00000000FFFFFFFFFFFFFFFFBCE6FAADA7179E84F3B9CAC2FC632551", 16)
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ChosenCurve.H, _ = new(big.Int).SetString("01", 16)
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ChosenCurve.Name = "Secp256r1"
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}
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// SetCurveSecp256k1 Will set the curve parameters to match Secp256k1
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func (ChosenCurve *Curve) SetCurveSecp256k1() {
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ChosenCurve.P, _ = new(big.Int).SetString("FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFEFFFFFC2F", 16)
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ChosenCurve.A, _ = new(big.Int).SetString("0000000000000000000000000000000000000000000000000000000000000000", 16)
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ChosenCurve.B, _ = new(big.Int).SetString("0000000000000000000000000000000000000000000000000000000000000007", 16)
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ChosenCurve.G.X, _ = new(big.Int).SetString("79BE667EF9DCBBAC55A06295CE870B07029BFCDB2DCE28D959F2815B16F81798", 16)
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ChosenCurve.G.Y, _ = new(big.Int).SetString("483ADA7726A3C4655DA4FBFC0E1108A8FD17B448A68554199C47D08FFB10D4B8", 16)
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ChosenCurve.N, _ = new(big.Int).SetString("FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFEBAAEDCE6AF48A03BBFD25E8CD0364141", 16)
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ChosenCurve.H, _ = new(big.Int).SetString("01", 16)
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ChosenCurve.Name = "Secp256k1"
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}
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//NewEllipticCurve will instantiate a new EllipticCurve
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//Defaults to secp256r1
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func NewEllipticCurve(ct curveType) Curve {
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var curve Curve
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switch ct {
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case Secp256k1:
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curve.SetCurveSecp256k1()
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case Secp256r1:
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curve.SetCurveSecp256r1()
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default:
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curve.SetCurveSecp256r1()
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}
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return curve
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}
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