Implement PBKDF2, Scrypt, and HMAC#8989

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DaGenix wants to merge 9 commits intorust-lang:masterfrom

Commits on Sep 14, 2013

Implement CheckedNumCast trait for integer types.
Palmer Cox
committed
Implement mut_chunk_iter for mutable vectors.
Palmer Cox
committed
Digest: Add the block_size() method to the Digest trait.
Palmer Cox
committed
Digest: Add the output_bytes() method to the Digest trait.
Palmer Cox
committed
Crypto: Implement fixed_time_eq function.
Palmer Cox
committed
Crypto: Implement the read_u32_le and read_u32_be functions.
Palmer Cox
committed
Hmac: Implement the Mac trait and the Hmac function.
Palmer Cox
committed
PBKDF2: Implement the PBKDF2 Key Derivation function.
Palmer Cox
committed
Scrypt: Implement the Scrypt Key Derivation function.
Palmer Cox
committed