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o Major bugfixes:
- Fix a bug in the bounds-checking in the 32-bit curve25519-donna
implementation that caused incorrect results on 32-bit
implementations when certain malformed inputs were used along with
a small class of private ntor keys. This bug does not currently
appear to allow an attacker to learn private keys or impersonate a
Tor server, but it could provide a means to distinguish 32-bit Tor
implementations from 64-bit Tor implementations. Fixes bug 12694;
bugfix on 0.2.4.8-alpha. Bug found by Robert Ransom; fix from
Adam Langley.
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