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/usr/include/nacl/crypto_hash.h is in libnacl-dev 20110221-5.

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#ifndef crypto_hash_H
#define crypto_hash_H

#include "crypto_hash_sha512.h"

#define crypto_hash crypto_hash_sha512
#define crypto_hash_BYTES crypto_hash_sha512_BYTES
#define crypto_hash_PRIMITIVE "sha512"
#define crypto_hash_IMPLEMENTATION crypto_hash_sha512_IMPLEMENTATION
#define crypto_hash_VERSION crypto_hash_sha512_VERSION

#endif