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x/crypto/curve25519,x/crypto/ed25519: reject low order points #31846

FiloSottile opened this issue May 5, 2019 · 0 comments


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commented May 5, 2019

Rejecting low order points is not strictly necessary, but it helps root out behaviors that can come unexpected to protocol designers (like non-contributory DH, or signature:message:key not being 1:1:1). libsodium already does indiscriminately, and we should too.

This was suggested by Cas Cremers and Dennis Jackson as part of their upcoming work on revisiting small subgroup and invalid curve attacks.

@FiloSottile FiloSottile added the NeedsFix label May 5, 2019

@FiloSottile FiloSottile added this to the Go1.13 milestone May 5, 2019

@FiloSottile FiloSottile self-assigned this May 5, 2019

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