AsymmetricKeyBuilder

A builder class for creating and importing asymmetric keys. This class provides methods to configure key properties and generate or import both public and private keys.

Extends

• BaseCryptoClass

Extended by

• RsaKeyBuilder
• RsaOaepKeyBuilder
• EccKeyBuilder
• DiffieHellmanKeyBuilder

Constructors

new AsymmetricKeyBuilder()

new AsymmetricKeyBuilder(): AsymmetricKeyBuilder

Returns

AsymmetricKeyBuilder

Methods

buildGenerated()

buildGenerated(): Promise<PrivateKey>

Build a new private key based on the configured properties.

Throws

• If the chosen key size or the key itself is invalid.

Returns

Promise<PrivateKey>

Promise A promise that resolves to the generated private key.

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buildPrivateFromDer()

buildPrivateFromDer(der: ArrayBuffer): Promise<PrivateKey>

Import a private key from a DER-encoded blob.

The imported key will inherit the properties (algorithm, purposes, exportability) set on this builder.

Parameters

der

ArrayBuffer

The DER-encoded private key in PKCS#8 format.

Throws

• If the provided key is invalid.

Returns

Promise<PrivateKey>

Promise A promise that resolves to the imported private key.

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buildPublicFromDer()

buildPublicFromDer(der: ArrayBuffer): Promise<PublicKey>

Import a public key from a DER-encoded blob.

The imported key will inherit the properties (algorithm, purposes) set on this builder.

Parameters

der

ArrayBuffer

The DER-encoded public key in SubjectPublicKeyInfo format.

Throws

• If the provided key is invalid.

Returns

Promise<PublicKey>

Promise A promise that resolves to the imported public key.

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Last updated: Jul 22, 2026