Here are the classes, structs, unions and interfaces with brief descriptions:

CCryptographicVerificationFailureException	Thrown when a cryptographic operation fails due to keys or data being corrupted, modified, or of incorrect length
CInvalidRecipeJsonException	Thrown when a recipe string is not in valid JSON format and cannot be parsed
CInvalidRecipeValueException	Thrown when a JSON value in the recipe is in an invalid format or contains an invalid value
CJsonParsingException	Thrown when a JSON-string is not valid
CKeyLengthException	Thrown when a key is specified to be an invalid or incorrect length
CPackagedSealedMessage	When a message is sealed, the ciphertext is packaged with the recipe in JSON Format for Recipes, as well as any optional unsealing instructions it was sealed with (unsealingInstructions)
CPassword	A secret derived from a seed string and set of options in JSON Format for Recipes
CRecipe	This class parses a recipe string on construction and then exposes the Recipe JSON Universal Fields as fields of this class
CSealingKey	A sealingKeyBytes is used to seal messages, in combination with a UnsealingKey which can unseal them. The key pair of this sealingKeyBytes and the matching UnsealingKey are generated from a seed and a set of options in JSON format JSON Format for Recipes
CSecret	A secret derived from a seed string and set of options in JSON Format for Recipes
CSignatureVerificationKey	A SignatureVerificationKey is used to verify that messages were signed by its corresponding SigningKey. SigningKeys generate signatures, and by verifying a message/signature pair the SignatureVerificationKey can confirm that the message was indeed signed using the SigningKey. The key pair of the SigningKey and SignatureVerificationKey is generated from a seed and a set of options in JSON Format for Recipes
CSigningKey	SigningKeys generate signatures of messages which can then be used by the corresponding SignatureVerificationKey to verify that a message was signed by can confirm that the message was indeed signed by the SigningKey and has not since been tampered with
CSodiumBuffer	A byte array containing a length and a pointer to memory (the data field), which ensures data is erased (replaced with zeros) before the memory it occupies is released for re-use by other objects
CSymmetricKey	A SymmetricKey can be used to seal and unseal messages. This SymmetricKey class can be (re) derived from a seed using set of recipe specified in JSON Format for Recipes. So, you can use this symmetric-key to seal a message, throw the key away, and re-generate the key when you need to unseal the message so long as you still have the original seed and recipe
CUnsealingKey	UnsealingKey is used to unseal messages sealed with its corresponding SealingKey. The UnsealingKey and SealingKey are generated from a seed and a set of options in JSON Format for Recipes