crypto chunked hash

[Istvan Soos]

Hi,

I find the crypto package a bit confusing wrt/ how to calculate sha1 hash of a big file. Does the team have an example on how they suggest doing that?

Setting the result object on the startChunkedConversion() call is not really intuitive, and as there seems to be a pending breaking change anyway, I'd suggest a different route:

• Move sha1 and similar variables into functions that takes a List<int> and return a hash. Similar to the current convert() method, they don't store or manipulate internal state, they may not be on the class.
• Make the Sha1Hash class implement the Sink or even the ByteConversionSink interface, and on closing, calculate the digest.
  

Best regards,

  Istvan

[Kevin Moore]

See https://github.com/dart-lang/crypto/blob/master/example/hash.dart

This will make sure you don't load the entire file into memory. It streams into the "hasher" and you get a result when you hit the end.

Let us know if you have other issues.

[Istvan Soos]

Thanks Kevin,

That is neat, it would be worth to put the bind part of that example
into the readme.

Thanks,
Istvan

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[Kevin Moore]

File an issue on the crypto repo – a great suggestion!

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