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This is most of the code I wrote for Enginge Yard's July 2009 SHA1 Hashing Contest. The consumer can do about 12M/keys/core (Xeon 2.33Ghz) It uses Amazon's SQS for distributing the work units and results. The processor takes 32 64-character stems (the length of a single SHA1 block). It appends the 5 extra character suffix to each of those stems in an attempt to find a low hamming distance. This allows us to: 1. Only perform the message expansion phase of SHA1 once per 5 character suffix for each set of 32 stems. 2. Compute 4 hashes (1 suffix added to 4 different stems) at a time using SSE2 Vectorization. 3. Precompute some of the expanded message for the suffix blocks since we know what they will look like (always 5 characters)