ECC Keypair Generator

Category: Asymmetric & Elliptic Curve · Node Type ID: asymmetric-ecc-keygen

Generates Elliptic Curve keypair (NIST P-256/384/521, secp256k1, Brainpool)

Overview

Generates an Elliptic Curve Cryptography (ECC) private scalar and uncompressed public point on one of 6 standardized prime-field Weierstrass curves: NIST P-256 (secp256r1), P-384 (secp384r1), P-521 (secp521r1) (FIPS 186-5), secp256k1 (SECG / Bitcoin / Ethereum), or European TeleTrusT brainpoolP256r1 and brainpoolP384r1 (RFC 5639).

The generated keypair can be used directly with both ECC Sign (ECDSA) / ECC Verify (ECDSA) and ECDH Key Agreement on the same curve.

When to Use

Generating Weierstrass elliptic-curve keypairs for ECDSA signing/verification or ECDH key agreement across NIST, blockchain (secp256k1), or ePassport/automotive (Brainpool) curves.

Parameter Configuration

Parameter (ID)	Type & Default	Visibility Condition	Description & Options
Elliptic Curve `curve`	`select` Default: `p256`	Always visible	Selects the elliptic curve domain parameters: `p256` (32B private / 65B public), `p384` (48B private / 97B public), `p521` (66B private / 133B public), `secp256k1` (32B private / 65B public), `brainpoolP256r1` (32B private / 65B public), or `brainpoolP384r1` (48B private / 97B public). `secp256k1`: secp256k1 (Bitcoin / Ethereum) `p256`: NIST P-256 (secp256r1 / prime256v1) `p384`: NIST P-384 (secp384r1) `p521`: NIST P-521 (secp521r1) `brainpoolP256r1`: Brainpool P256r1 (RFC 5639) `brainpoolP384r1`: Brainpool P384r1 (RFC 5639) `brainpoolP512r1`: Brainpool P512r1 (RFC 5639)

Port I/O Specification

See Ports & Connections for general wiring rules, data type colors, and dynamic port creation.

Input Ports

This node has no input ports.

Output Ports

Port Nature: Fixed Output Ports (2 total).

Port Name	Port ID	Data Type	Visibility Condition	Description
`Private Key`	`privateKey`	`Bytes`	Always visible	Raw big-endian private scalar $d$ (32 bytes for 256-bit curves, 48 bytes for 384-bit curves, 66 bytes for P-521).
`Public Key`	`publicKey`	`Bytes` (Uncompressed)	Always visible	Uncompressed SEC 1 elliptic curve point ($0x04 \parallel X \parallel Y$: 65 bytes for 256-bit curves, 97 bytes for 384-bit curves, 133 bytes for P-521).

Error Cases

This node has no runtime failure cases (errorProfile: none) and always succeeds for any valid typed input.

Examples

Generating a NIST P-256 Keypair

Create a 32-byte private key and 65-byte uncompressed public key on P-256.

Leave Elliptic Curve set to NIST P-256 (secp256r1).
Wire Private Key to ECC Sign (ECDSA) and Public Key to ECC Verify (ECDSA).