Checksums

CineRename can calculate and verify cryptographic hashes of your files — useful for detecting disk corruption, validating a download, or ensuring the integrity of a library archive.

Calculating Checksums

In the Studio, select one or more entries then click Calculate checksums (toolbar). The dialog offers four algorithms:

Algorithm	Speed	Robustness	Typical Use
CRC32	⚡⚡⚡	Low	Basic error detection (legacy .sfv manifests)
MD5	⚡⚡	Medium	Compatibility with md5sum, older torrents
SHA-1	⚡⚡	Good	Compatible sha1sum, Git repositories
SHA-256	⚡	Excellent	Recommended choice for long-term archives

Hashes are computed in parallel (rayon) and displayed in the list. Each row exposes a Copy button to retrieve the hash into the clipboard.

Exporting a Manifest

Once the hashes are calculated, Save manifest… writes a sidecar file next to your media:

Algorithm	Format	Compatible with
CRC32	.sfv	cksfv, FileBot, scene release tools
MD5	.md5	md5sum -c (Linux), HashCheck (Windows)
SHA-1	.sha1	sha1sum -c
SHA-256	.sha256	sha256sum -c

The manifest stores paths relative to the folder where it is saved, making it portable.

Verifying a Manifest

The Verify a manifest… button in the same dialog reads an existing manifest and compares the hashes to the current files:

1. Choose the manifest file (.sfv, .md5, .sha1, .sha256)
2. The algorithm is automatically inferred from the extension
3. CineRename hashes each referenced file and compares it to the stored hashes
4. Three possible statuses:
   • ✅ OK — hash matches
   • ❌ Altered — computed hash differs from the stored one (corruption, involuntary modification)
   • ⚠️ Missing — the referenced file no longer exists

The summary at the top of the dialog indicates N matched / M mismatched / K missing.

Use Cases

• Long-term archiving: generate a SHA-256 manifest per season folder, then verify every 6 months to detect bit rot.
• Post-download validation: if your source provides a .sfv or an .md5, verify that no file was corrupted during transfer.
• Library audit: before moving to a new disk or NAS migration, snapshot the entire library in SHA-256 then re-verify on the new target.

Performance

On a modern SSD, reading is the bottleneck — expect:

• ~500 MB/s for SHA-256 (single thread)
• ~1.5 GB/s for MD5
• ~2 GB/s for CRC32

CineRename uses rayon to hash multiple files in parallel, so a batch of 10 files will saturate the disk, not the CPU. On HDD, expect time proportional to the total size.