Use WebCrypto API for HMAC-SHA1 about shadowsocks-chromeapp HOT 6 OPEN

This one is also in my plan :)

But first we need to unify the data representation, now we use string as forge's buffer and ArrayBuffer as Chrome API's buffer, they are different and the convert between them is expensive.

Maybe use ArrayBuffer at all time is a good choice, because it's native and WebCrypto API also use this. But we need something like StringView to interpret ArrayBuffer as String, this maybe a big change.

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ArrayBuffer should be more efficient. We can replace forge with asmcrypto which claims to be the fastest JS crypto and it accepts both Uint8Array and ArrayBuffer

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Sounds good～
We may run some tests to confirm this，and we must confirm asmcrypto supports partial block encryption，many js crypto implementation didnt support it

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Looks like we need to wait for awhile. asmcrypto/asmcrypto.js#68

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Or we can patch it by ourselves, like I did to forge, maybe it's not a hard work

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Neither you, nor I have the time for extra work.

I'm very new to JavaScript...

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