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

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#ifndef crypto_auth_H
#define crypto_auth_H

#include "crypto_auth_hmacsha512256.h"

#define crypto_auth crypto_auth_hmacsha512256
#define crypto_auth_verify crypto_auth_hmacsha512256_verify
#define crypto_auth_BYTES crypto_auth_hmacsha512256_BYTES
#define crypto_auth_KEYBYTES crypto_auth_hmacsha512256_KEYBYTES
#define crypto_auth_PRIMITIVE "hmacsha512256"
#define crypto_auth_IMPLEMENTATION crypto_auth_hmacsha512256_IMPLEMENTATION
#define crypto_auth_VERSION crypto_auth_hmacsha512256_VERSION

#endif