Implementation comparison: crypto_hash/sha256

Operationcrypto_hash
Primitivesha256
Description SHA-256 with 256-bit output
Designers NSA
Implementations cryptopp Wei Dai (wrapper around Crypto++)
openssl Daniel J. Bernstein (wrapper around OpenSSL)
ref Daniel J. Bernstein (wrapper around crypto_hashblocks/sha256)
sphlib Thomas Pornin
sphlib-small Thomas Pornin