Sha1 and Sha2 cleanups & optimizations, take 2#8174

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DaGenix wants to merge 9 commits intorust-lang:masterfrom

DaGenix:digest-improvements

Commits on Aug 2, 2013

Sha2: Remove unecessary integer type specifications.
Palmer Cox
committed
Sha2: Rearrage traits / impls / structs.
Palmer Cox
committed
Sha2: Remove the result_X() methods; move logic into the Digest impls.
Palmer Cox
committed
Sha2: Create cryptoutil.rs and re-write the Sha2 module to make use of it.
Palmer Cox
committed
Sha2: Re-write the Sha2 compression functions to improve performance.
Palmer Cox
committed
Crypto: Remove DigestUtil and convert to default methods on the Digest trait.
Palmer Cox
committed
Crypto: Add large input tests for all Digests
Palmer Cox
committed
Crypto: Add overflow checking addition functions.
Palmer Cox
committed
Sha1: Update Sha1 to use new functionality in cryptoutil.rs
Palmer Cox
committed