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/usr/include/nacl/crypto_sign_edwards25519sha512batch.h is in libnacl-dev 20110221-5.

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#ifndef crypto_sign_edwards25519sha512batch_H
#define crypto_sign_edwards25519sha512batch_H

#define crypto_sign_edwards25519sha512batch_ref_SECRETKEYBYTES 64
#define crypto_sign_edwards25519sha512batch_ref_PUBLICKEYBYTES 32
#define crypto_sign_edwards25519sha512batch_ref_BYTES 64
#ifdef __cplusplus
#include <string>
extern std::string crypto_sign_edwards25519sha512batch_ref(const std::string &,const std::string &);
extern std::string crypto_sign_edwards25519sha512batch_ref_open(const std::string &,const std::string &);
extern std::string crypto_sign_edwards25519sha512batch_ref_keypair(std::string *);
extern "C" {
#endif
extern int crypto_sign_edwards25519sha512batch_ref(unsigned char *,unsigned long long *,const unsigned char *,unsigned long long,const unsigned char *);
extern int crypto_sign_edwards25519sha512batch_ref_open(unsigned char *,unsigned long long *,const unsigned char *,unsigned long long,const unsigned char *);
extern int crypto_sign_edwards25519sha512batch_ref_keypair(unsigned char *,unsigned char *);
#ifdef __cplusplus
}
#endif

#define crypto_sign_edwards25519sha512batch crypto_sign_edwards25519sha512batch_ref
#define crypto_sign_edwards25519sha512batch_open crypto_sign_edwards25519sha512batch_ref_open
#define crypto_sign_edwards25519sha512batch_keypair crypto_sign_edwards25519sha512batch_ref_keypair
#define crypto_sign_edwards25519sha512batch_BYTES crypto_sign_edwards25519sha512batch_ref_BYTES
#define crypto_sign_edwards25519sha512batch_PUBLICKEYBYTES crypto_sign_edwards25519sha512batch_ref_PUBLICKEYBYTES
#define crypto_sign_edwards25519sha512batch_SECRETKEYBYTES crypto_sign_edwards25519sha512batch_ref_SECRETKEYBYTES
#define crypto_sign_edwards25519sha512batch_IMPLEMENTATION "crypto_sign/edwards25519sha512batch/ref"
#ifndef crypto_sign_edwards25519sha512batch_ref_VERSION
#define crypto_sign_edwards25519sha512batch_ref_VERSION "-"
#endif
#define crypto_sign_edwards25519sha512batch_VERSION crypto_sign_edwards25519sha512batch_ref_VERSION

#endif