docs: add godoc comments to all exported functions and methods

mc/crypto/cfb8.go

@@ -41,10 +41,12 @@ type CFB8 struct {
 	mutex     sync.Mutex
 }
 
+// NewCFB8Decrypt creates a new CFB8 stream cipher in decrypt mode.
 func NewCFB8Decrypt(c cipher.Block, iv []byte) *CFB8 {
 	return newCFB8(c, iv, true)
 }
 
+// NewCFB8Encrypt creates a new CFB8 stream cipher in encrypt mode.
 func NewCFB8Encrypt(c cipher.Block, iv []byte) *CFB8 {
 	return newCFB8(c, iv, false)
 }

mc/crypto/offline.go

@@ -21,6 +21,7 @@ func uuidV3(space []byte, data []byte) uuid.UUID {
 	return u
 }
 
+// FromOfflinePlayer generates a UUID for an offline-mode (cracked) player from their display name.
 func FromOfflinePlayer(displayName string) uuid.UUID {
 	return uuidV3([]byte("OfflinePlayer:"), []byte(displayName))
 }