exchangeKeys(publicKey:algorithm:parameters:completion:)

Performs a Diffie-Hellman style key exchange operation.

Declaration

func exchangeKeys(publicKey: Data, algorithm: SecKeyAlgorithm, parameters: [AnyHashable : Any], completion handler: @escaping  @Sendable (Data?, (any Error)?) -> Void)

func exchangeKeys(publicKey: Data, algorithm: SecKeyAlgorithm, parameters: [AnyHashable : Any]) async throws -> Data

Parameters

publicKey:
The remote party’s public key.
algorithm:
An algorithm suitable for performing this key exchange. For example, ecdhKeyExchangeCofactorX963SHA256.
parameters:
A dictionary with parameters for this key exchange.
handler:
A completion handler to call when the key exchange operation completes.
data
The result of the key exchange operation.
error
An error object that indicates why the key exchange failed, or nil if the exchange succeeded.

Discussion

important:

You can call this method from synchronous code using a completion handler, as shown on this page, or you can call it as an asynchronous method that has the following declaration:

func exchangeKeys(publicKey: Data, algorithm: SecKeyAlgorithm, parameters: [AnyHashable : Any]) async throws -> Data

For information about concurrency and asynchronous code in Swift, see Calling Objective-C APIs Asynchronously.

The algorithm you use determines the parameters in the dictionary that are required or optional. For more information, see SecKeyKeyExchangeParameter.

exchangeKeys(publicKey:algorithm:parameters:completion:)

Declaration

Parameters

Discussion

See Also

Performing cryptographic operations