2016-09-06 10:50
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AES256-GCM could be implemented in go as

However, Seal method of interface cipher.AEAD has signature:

Seal(dst, nonce, plaintext, additionalData []byte) []byte

So for very large files, one must read all file contents into memory, which is unacceptable.

A possible way is to implement Reader/Writer interfaces on Seal and Open, but shouldn't that be solved by those block cipher "modes" of AEAD? So I wonder if this is a design mistake of golang cipher lib, or I missed something important with GCM?

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