CVE-2017-7781/CVE-2017-10176:Issue with elliptic curve addition in mixed Jacobian-affine coordinates in Firefox/Java http://blog.intothesymmetry.com/2017/08/cve-2017-7781cve-2017-10176-issue-with.html …pic.twitter.com/54Xh5y3mmo
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here is a P-521 example (no invalid curve attack needed) https://gist.github.com/asanso/6d33e91a9f85f3d4dba4ec519eece6e9 …
See https://github.com/openssl/openssl/blob/master/crypto/ec/ecp_nistp521.c#L1255 … and https://github.com/openssl/openssl/blob/master/crypto/ec/ecp_nistp521.c#L1160-L1162 … (“This case never happens during single point multiplication, so...”)
well my example shows that that sentence is wrong (at least using 5-wnaf)
You can see the P-521 precomputation table used here: https://github.com/openssl/openssl/blob/master/crypto/ec/ecp_nistp521.c#L1318 …. It may not be what your code assumes; I didn't look closely.
Note that these tables are probably in a different form than what NSS and OpenJDK were using, which may make an attack easier and/or harder.
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