[libtorrent] Crypto

[Michael Mckeown]

* built-in - (default) uses built-in SHA-1 implementation.
* openssl - links against openssl and libcrypto to use for SHA-1 hashing.
* gcrypt - links against libgcrypt to use for SHA-1 hashing.

Out the three what one is the fastest?
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[Arvid Norberg]

Post by Michael Mckeown
* built-in - (default) uses built-in SHA-1 implementation.
* openssl - links against openssl and libcrypto to use for SHA-1 hashing.
* gcrypt - links against libgcrypt to use for SHA-1 hashing.
Out the three what one is the fastest?

My expectation would be that the libcrypto/libssl have the most carefully
optimized sha-1 implementation. Certainly the built-in one is not the
fastest, it's more or less a reference C implementation.