ECDSANamedCurve

Represents an ECDSA curve over a prime field.

Methods and properties of this class are not considered public APIs. They are not subject to semantic versioning and may change anytime. Only use this class to create custom prime curves to pass to other APIs in this package.

Constructor

function constructor(
	p: bigint,
	a: bigint,
	b: bigint,
	gx: bigint,
	gy: bigint,
	n: bigint,
	h: bigint,
	size: number,
	objectIdentifier: string
): this;

Parameters

• p: This must be a prime. Setting this to non-primes can cause unexpected behaviors, including infinite loops.
• a: The coefficient of the elliptic curve.
• b: The coefficient of the elliptic curve.
• gx: The x coordinate of the base point (affine).
• gy: The y coordinate of the base point (affine).
• n: The order of G.
• h: The co-factor.
• size: The bit size of the curve in bytes (e.g. 32 for P-256).
• objectIdentifier: The dot notation object identifier. This must be unique to the curve.

Example

// secp256r1 (p-256)
const p256 = new ECDSANamedCurve(
	0xffffffff00000001000000000000000000000000ffffffffffffffffffffffffn,
	0xffffffff00000001000000000000000000000000fffffffffffffffffffffffcn,
	0x5ac635d8aa3a93e7b3ebbd55769886bc651d06b0cc53b0f63bce3c3e27d2604bn,
	0x6b17d1f2e12c4247f8bce6e563a440f277037d812deb33a0f4a13945d898c296n,
	0x4fe342e2fe1a7f9b8ee7eb4a7c0f9e162bce33576b315ececbb6406837bf51f5n,
	0xffffffff00000000ffffffffffffffffbce6faada7179e84f3b9cac2fc632551n,
	1n,
	32,
	"1.2.840.10045.3.1.7"
);