This is a 3DS NUS downloader written in Python 3(.6). It uses my own CIAGEN, completely written from scratch to create CIAs from CDN content. 3DS-NUSD can even create tickets from encrypted title keys.

It uses the requests module, so you'll need to install it with e.g. pip.

"CIAGEN" can create CIAs from cetk + tmd + contents completely in Python without make_cdn_cia. It can also unpack a CIA to its CDN contents!

Related project: PyNUSD

• Downloads 3DS titles from the Nintendo Update Server
  • NOTE: Only unblocked titles (e.g. system stuff) can be downloaded
• Packs them as valid CIAs
• Also accepts encrypted title keys
• Supports CDN mirrors through the --base parameter
• Uses my own CIAGEN, completely tested, verified and written from scratch

• Can be used as independent library
• Creates valid CIAs
• Verifies Signature (place root-key in the same directory)
• Doesn't modify the original TMD and contents

usage: 3DS-NUSD.py [-h] [--nopack] [--deletecontents] [--key ENCRYPTED_KEY]
                   [--onlyticket] [--cdn] [--base BASE_URL]
                   titleid [titleversion]

positional arguments:
  titleid              Title ID
  titleversion         Title version (default: Latest)

optional arguments:
  -h, --help           show this help message and exit
  --nopack             Do not generate CIA.
  --deletecontents     Do not keep contents.
  --key ENCRYPTED_KEY  Encrypted title key for Ticket generation.
  --onlyticket         Only create the ticket, don't store anything.
  --cdn                Store contents like on CDN (without version directory)
  --base BASE_URL      Base URL for CDN download

• Use Structs (already in CIAGEN)
• Improve Struct code (for e.g. ticket template and reading from binary)
• More Error handling and retrying
• Improve error handling in CIAGEN, especially for certificates and too short tmds/tickets
• Support for decrypting & SHA256 verify (via decTitleKeys.bin?)
• uselocal parameter (needs SHA256 verifying)
• GUI?

• Daeken for original Struct.py
• ps3hen for make_cdn_cia
• profi200 & contributors for makerom