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AES-256-GCM decrypt partial buffer at random access location in cypher text (HTTP byte range requests, video/audio) #22

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danielweck opened this issue Jan 4, 2017 · 3 comments

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danielweck commented Jan 4, 2017

Original Pull Request: #21 (comment)

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danielweck commented Jan 4, 2017

See Decrypt() where bool full is false (partial byte range request):
https://github.com/readium/readium-lcp-client/blob/feature/lsd/src/lcp-client-lib/AesGcmSymmetricAlgorithm.cpp#L125

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danielweck commented Jan 4, 2017 •

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More specifically, see CryptoPP IsRandomAccess.
https://github.com/weidai11/cryptopp/issues

Pipelining: https://www.cryptopp.com/wiki/Pipelining

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danielweck commented Jan 4, 2017

GCM is similar to CTR mode, which means that the IV can be computed at any random offset by incrementing the counter.
https://www.cryptopp.com/wiki/CTR_Mode#Seeking

danielweck mentioned this issue

disable GCM in config.yaml readium/readium-lcp-server#109

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