Decrypting reader stream - start at offset / seek?

[ChocolateLoverRaj]

If I have 500GB of encrypted data (encrypted with tink_streaming_aead), is it possible to continue decrypting starting at 300GB?

If not, is there any other algorithm / Rust library that lets me:

• Encrypt / decrypt a stream chunk by chunk
• Not have additional size per chunk, and only have an additional tag or something at the very beginning or very end?
• Start in the middle of the stream instead of the beginning (like the Seek trait)?

Here is my use case:

• Encrypt backup data (a diff of multiple files in one blob / S3 Object)
• Download the backup data to restore, but handle continuing from the middle of an object if the download failed previously.