椭圆Swift 2.0.7

EllipticSwift 2.0.7

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由 Alex Vlasov 维护。

EllipticSwift 2.0.7

椭圆Swift

安装

将以下行添加到您的 Podfile 中

  pod 'EllipticSwift', '~> 2.0'

示例

let curve = secp256k1Curve
        let generatorX = BigUInt("79BE667EF9DCBBAC55A06295CE870B07029BFCDB2DCE28D959F2815B16F81798", radix: 16)!
        let generatorY = BigUInt("483ADA7726A3C4655DA4FBFC0E1108A8FD17B448A68554199C47D08FFB10D4B8", radix: 16)!
        let success = curve.testGenerator(AffineCoordinates(generatorX, generatorY))
        XCTAssert(success, "Failed to init secp256k1 curve!")
        
        // this is basically a private key - large random scalar
        let randomScalar = BigUInt.randomInteger(lessThan: 256)
        guard let privateKey = U256(randomScalar.serialize()) else { return XCTFail()}
        
        // make point. Point is made from affine coordinates in normal (not Montgomery) representation
        guard let G = curve.toPoint(generatorX, generatorY) else {return XCTFail()}
        
        // calculate a public key
        let publicKey = privateKey * G
        XCTAssert(!publicKey.isInfinity)
        
        // also try to multiply by group order
        let groupOrder = curve.order
        let expectInfinity = groupOrder * G
        XCTAssert(expectInfinity.isInfinity)

限制

  • 点乘法还不是常量类型
  • 协议相当低效，全局清理将会发生
  • 尚未支持配对
  • U512 类型没有使用 polyfill
  • 在 iOS 上不支持 Montgomery（应该支持，但未测试）
  • 目前只支持 Weierstrass 曲线