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authorRichard van der Hoff <richard@matrix.org>2016-09-01 13:35:23 +0100
committerRichard van der Hoff <richard@matrix.org>2016-09-01 13:35:23 +0100
commit0c462cff112589fc52d13da6c919f881cb6d3f8c (patch)
tree9c71802ce0d583856b7cd47bfcf20cdfa05354ba /fuzzers/fuzz_decode_message.cpp
parentf03febb772c47855ab748ed6dee2f29db9f9c5ba (diff)
Fix Ed25519 keypair generation
Ed25519 private keys, it turns out, have 64 bytes, not 32. We were previously generating only 32 bytes (which is all that is required to generate the public key), and then using the public key as the upper 32 bytes when generating the per-message session key. This meant that everything appeared to work, but the security of the private key was severely compromised. By way of fixes: * Use the correct algorithm for generating the Ed25519 private key, and store all 512 bits of it. * Update the account pickle format and refuse to load the old format (since we should consider it compromised). * Bump the library version, and add a function to retrieve the library version, so that applications can verify that they are linked against a fixed version of the library. * Remove the curve25519_{sign, verify} functions which were unused and of dubious quality.
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