Interface: ProjPointType<T>

ec.weierstrass.ProjPointType

Design rationale for types

• Interaction between classes from different curves should fail: k256.Point.BASE.add(p256.Point.BASE)
• For this purpose we want to use instanceof operator, which is fast and works during runtime
• Different calls of curve() would return different classes - curve(params) !== curve(params): if somebody decided to monkey-patch their curve, it won't affect others

TypeScript can't infer types for classes created inside a function. Classes is one instance of nominative types in TypeScript and interfaces only check for shape, so it's hard to create unique type for every function call.

We can use generic types via some param, like curve opts, but that would:

1. Enable interaction between `curve(params)` and `curve(params)` (curves of same params)
which is hard to debug.
2. Params can be generic and we can't enforce them to be constant value:
if somebody creates curve from non-constant params,
it would be allowed to interact with other curves with non-constant params

TODO: https://www.typescriptlang.org/docs/handbook/release-notes/typescript-2-7.html#unique-symbol

Type parameters

Name
T

Hierarchy

• Group<ProjPointType<T>>

  ↳ ProjPointType

Properties

px

• Readonly px: T

Defined in

node_modules/@noble/curves/esm/abstract/weierstrass.d.ts:58

---

py

• Readonly py: T

Defined in

node_modules/@noble/curves/esm/abstract/weierstrass.d.ts:59

---

pz

• Readonly pz: T

Defined in

node_modules/@noble/curves/esm/abstract/weierstrass.d.ts:60

Accessors

x

• get x(): T

Returns

T

Defined in

node_modules/@noble/curves/esm/abstract/weierstrass.d.ts:61

---

y

• get y(): T

Returns

T

Defined in

node_modules/@noble/curves/esm/abstract/weierstrass.d.ts:62

Methods

multiply

▸ multiply(scalar): ProjPointType<T>

Parameters

Name	Type
scalar	bigint

Returns

ProjPointType<T>

Overrides

Group.multiply

Defined in

node_modules/@noble/curves/esm/abstract/weierstrass.d.ts:63

---

toAffine

▸ toAffine(iz?): AffinePoint<T>

Parameters

Name	Type
iz?	T

Returns

AffinePoint<T>

Defined in

node_modules/@noble/curves/esm/abstract/weierstrass.d.ts:64

---

isTorsionFree

▸ isTorsionFree(): boolean

Returns

boolean

Defined in

node_modules/@noble/curves/esm/abstract/weierstrass.d.ts:65

---

clearCofactor

▸ clearCofactor(): ProjPointType<T>

Returns

ProjPointType<T>

Defined in

node_modules/@noble/curves/esm/abstract/weierstrass.d.ts:66

---

assertValidity

▸ assertValidity(): void

Returns

void

Defined in

node_modules/@noble/curves/esm/abstract/weierstrass.d.ts:67

---

hasEvenY

▸ hasEvenY(): boolean

Returns

boolean

Defined in

node_modules/@noble/curves/esm/abstract/weierstrass.d.ts:68

---

toRawBytes

▸ toRawBytes(isCompressed?): Uint8Array

Parameters

Name	Type
isCompressed?	boolean

Returns

Uint8Array

Defined in

node_modules/@noble/curves/esm/abstract/weierstrass.d.ts:69

---

toHex

▸ toHex(isCompressed?): string

Parameters

Name	Type
isCompressed?	boolean

Returns

string

Defined in

node_modules/@noble/curves/esm/abstract/weierstrass.d.ts:70

---

multiplyUnsafe

▸ multiplyUnsafe(scalar): ProjPointType<T>

Parameters

Name	Type
scalar	bigint

Returns

ProjPointType<T>

Defined in

node_modules/@noble/curves/esm/abstract/weierstrass.d.ts:71

---

multiplyAndAddUnsafe

▸ multiplyAndAddUnsafe(Q, a, b): undefined | ProjPointType<T>

Parameters

Name	Type
Q	ProjPointType<T>
a	bigint
b	bigint

Returns

undefined | ProjPointType<T>

Defined in

node_modules/@noble/curves/esm/abstract/weierstrass.d.ts:72

---

_setWindowSize

▸ _setWindowSize(windowSize): void

Parameters

Name	Type
windowSize	number

Returns

void

Defined in

node_modules/@noble/curves/esm/abstract/weierstrass.d.ts:73

---

double

▸ double(): ProjPointType<T>

Returns

ProjPointType<T>

Inherited from

Group.double

Defined in

node_modules/@noble/curves/esm/abstract/curve.d.ts:11

---

negate

▸ negate(): ProjPointType<T>

Returns

ProjPointType<T>

Inherited from

Group.negate

Defined in

node_modules/@noble/curves/esm/abstract/curve.d.ts:12

---

add

▸ add(other): ProjPointType<T>

Parameters

Name	Type
other	ProjPointType<T>

Returns

ProjPointType<T>

Inherited from

Group.add

Defined in

node_modules/@noble/curves/esm/abstract/curve.d.ts:13

---

subtract

▸ subtract(other): ProjPointType<T>

Parameters

Name	Type
other	ProjPointType<T>

Returns

ProjPointType<T>

Inherited from

Group.subtract

Defined in

node_modules/@noble/curves/esm/abstract/curve.d.ts:14

---

equals

▸ equals(other): boolean

Parameters

Name	Type
other	ProjPointType<T>

Returns

boolean

Inherited from

Group.equals

Defined in

node_modules/@noble/curves/esm/abstract/curve.d.ts:15