init(_:)

Creates a new custom context that provides a unique string.

Declaration

init?(_ string: String)

Parameters

string:
The string to use as the underlying context, which must be equal to or greater than three characters long. The framework converts the string to UTF-8 prior to hashing it in the derivation.

Return Value

A new Context, or nil if the provided string was too short

Discussion

The custom context may use any string that is representable as UTF-8, and which normalizes to the same value when represented as bytes. A best practice is to use ASCII-compatible values to avoid normalization issues. Set the same byte value on the local and remote devices in order to generate the same shared secret.