`openssl cms -decrypt -stream` support
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- Dominant language
- C
- Stars
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Description
openssl cms -encrypt -stream is supported and may produce very large files. That's very good.
Unfortunately, current code that decrypts the result of such encryption loads the whole file into memory. It's inefficient, slow, and sometimes is a blocker for large encrypted files.
I think, streaming decryption (and signature verification in another use case) should be supported.
As a suggestion, if source is a plain file, fadvice() should be used if possible, in order not to pollute pagecache.
Here #26274 I figured out, that -stream is silently ignored on decryption and streaming decryption seems is not implemented at all.
Contributor guide
First steps
- Read the whole issue, then the project's contributing guide.
- Comment on the issue to say you are picking it up — it saves two people doing the same work.
- Fork the repository and make your change on a branch.
- Open a pull request that references the issue number.
Research direction
Start with the openssl cms -decrypt -stream entry point and compare it with the supported -encrypt -stream behavior, using issue #26274 for context. Check how fadvice() could apply to plain-file input. Done means decryption and the mentioned signature-verification use case stream without loading the whole file into memory, and -stream is no longer silently ignored.
Written by the indexing model from the issue text.
Assessment
- Tech stack
- c
- Domain
- cryptography
- Issue type
- Feature
- Difficulty
- 5/5
- Estimated time
- Over a week
- Activity status
- Stale
- Clarity
- Needs clarification
- Newbie friendliness
- 30/100