fn extractInit(salt: []const u8) Hmac

Initialize the creation of a master key from a salt and keying material that can be added later, possibly in chunks. Example:

var prk: [hkdf.prk_length]u8 = undefined;
var hkdf = HkdfSha256.extractInit(salt);
hkdf.update(ikm1);
hkdf.update(ikm2);
hkdf.final(&prk);

Parameters

salt: []const u8,