Adding DocC Comments to decrypt and encrypt Functions

Sources/NostrSDK/DirectMessageEncrypting.swift

@@ -21,6 +21,14 @@ public enum DirectMessageEncryptingError: Error {
 public protocol DirectMessageEncrypting {}
 public extension DirectMessageEncrypting {
 
+    /// Produces a `String` containing `content`that has been encrypted using a sender's`privateKey` and a recipients `publicKey` .
+    /// This function can `throw` in the case of a failure to create a shared secret, a failure to successfully encrypt, or an invalid `publicKey`.
+    ///
+    /// - Parameters:
+    ///   - content: The content to encrypt.
+    ///   - privateKey: The private key of the sender.
+    ///   - publicKey: The public key of the intended recipient.
+    /// - Returns: Encrypted content..
     func encrypt(content: String, privateKey: PrivateKey, publicKey: PublicKey) throws -> String {
 
         let sharedSecret = try getSharedSecret(privateKey: privateKey, recipient: publicKey)
@@ -34,6 +42,14 @@ public extension DirectMessageEncrypting {
         return encodeDMBase64(content: encryptedMessage.bytes, iv: iv)
     }
 
+    /// Produces a `String` containing `encryptedContent`that has been decrypted using a recipient's`privateKey` and a sender's `publicKey` .
+    /// This function can `throw` in the case of a failure to create a shared secret, a failure to successfully encrypt, or an invalid `publicKey`.
+
+    /// - Parameters:
+    ///   - encryptedContent: The content to decrypt.
+    ///   - privateKey: The private key of the receiver.
+    ///   - publicKey: The public key of the sender.
+    /// - Returns: The un-encrypted message.
     func decrypt(encryptedContent message: String, privateKey: PrivateKey, publicKey: PublicKey) throws -> String {
         guard let sharedSecret = try? getSharedSecret(privateKey: privateKey, recipient: publicKey) else {
             throw EventCreatingError.invalidInput