Use PRNG to Encrypt Needles in Haystack

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This is a merge from the widevine repo of http://go/wvgerrit/14262

This CL replaces AES with a psuedorandom number generator to encrypt
the needles in the oemcyrpto level 3 haystack.  This speeds up the
overhead significantly, and reduces decrypt times by as much as 75%
for small buffers (1-3 kb).  This makes the obfuscation slightly less
secure but is worth the overall performance boost.

Level 3 library versions:
level3/arm/libwvlevel3.a  Level3 Library May  1 2015 15:45:12
level3/x86/libwvlevel3.a  Level3 Library May  1 2015 15:45:55

b/19582757 L3 Widevine extremely choppy on Nexus 6 (480p)

Change-Id: I3077c04047a7f2da6f64869d7a9af5ddcc62671f

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This commit is contained in:

Fred Gylys-Colwell

2015-05-01 15:50:26 -07:00

parent 9585237b33

commit dfb1c39275

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libwvdrmengine/level3/arm/libwvlevel3.a

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