# init(seedRepresentation:publicKey:) Initializes a private key from the seed representation. ``` init(seedRepresentation: D, publicKey: MLDSA87.PublicKey?) throws where D : DataProtocol ``` ## Parameters `seedRepresentation` The seed representation of the private key. This parameter needs to be 32 bytes long. `publicKey` The public key associated with the secret key. ## Discussion This initializer implements the `ML-DSA.KeyGen_internal` algorithm (Algorithm 16) of FIPS 204. If a public key is provided, a consistency check is performed between it and the derived public key. --- Copyright © 2026 Apple Inc. All rights reserved. | [Terms of Use](https://www.apple.com/legal/internet-services/terms/site.html) | [Privacy Policy](https://www.apple.com/privacy/privacy-policy)