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/usr/include/nacl/crypto_auth_hmacsha512256.h is in libnacl-dev 20110221-5.

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#ifndef crypto_auth_hmacsha512256_H
#define crypto_auth_hmacsha512256_H

#define crypto_auth_hmacsha512256_ref_BYTES 32
#define crypto_auth_hmacsha512256_ref_KEYBYTES 32
#ifdef __cplusplus
#include <string>
extern std::string crypto_auth_hmacsha512256_ref(const std::string &,const std::string &);
extern void crypto_auth_hmacsha512256_ref_verify(const std::string &,const std::string &,const std::string &);
extern "C" {
#endif
extern int crypto_auth_hmacsha512256_ref(unsigned char *,const unsigned char *,unsigned long long,const unsigned char *);
extern int crypto_auth_hmacsha512256_ref_verify(const unsigned char *,const unsigned char *,unsigned long long,const unsigned char *);
#ifdef __cplusplus
}
#endif

#define crypto_auth_hmacsha512256 crypto_auth_hmacsha512256_ref
#define crypto_auth_hmacsha512256_verify crypto_auth_hmacsha512256_ref_verify
#define crypto_auth_hmacsha512256_BYTES crypto_auth_hmacsha512256_ref_BYTES
#define crypto_auth_hmacsha512256_KEYBYTES crypto_auth_hmacsha512256_ref_KEYBYTES
#define crypto_auth_hmacsha512256_IMPLEMENTATION "crypto_auth/hmacsha512256/ref"
#ifndef crypto_auth_hmacsha512256_ref_VERSION
#define crypto_auth_hmacsha512256_ref_VERSION "-"
#endif
#define crypto_auth_hmacsha512256_VERSION crypto_auth_hmacsha512256_ref_VERSION

#endif