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/usr/include/nacl/crypto_secretbox_xsalsa20poly1305.h is in libnacl-dev 20110221-5.

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#ifndef crypto_secretbox_xsalsa20poly1305_H
#define crypto_secretbox_xsalsa20poly1305_H

#define crypto_secretbox_xsalsa20poly1305_ref_KEYBYTES 32
#define crypto_secretbox_xsalsa20poly1305_ref_NONCEBYTES 24
#define crypto_secretbox_xsalsa20poly1305_ref_ZEROBYTES 32
#define crypto_secretbox_xsalsa20poly1305_ref_BOXZEROBYTES 16
#ifdef __cplusplus
#include <string>
extern std::string crypto_secretbox_xsalsa20poly1305_ref(const std::string &,const std::string &,const std::string &);
extern std::string crypto_secretbox_xsalsa20poly1305_ref_open(const std::string &,const std::string &,const std::string &);
extern "C" {
#endif
extern int crypto_secretbox_xsalsa20poly1305_ref(unsigned char *,const unsigned char *,unsigned long long,const unsigned char *,const unsigned char *);
extern int crypto_secretbox_xsalsa20poly1305_ref_open(unsigned char *,const unsigned char *,unsigned long long,const unsigned char *,const unsigned char *);
#ifdef __cplusplus
}
#endif

#define crypto_secretbox_xsalsa20poly1305 crypto_secretbox_xsalsa20poly1305_ref
#define crypto_secretbox_xsalsa20poly1305_open crypto_secretbox_xsalsa20poly1305_ref_open
#define crypto_secretbox_xsalsa20poly1305_KEYBYTES crypto_secretbox_xsalsa20poly1305_ref_KEYBYTES
#define crypto_secretbox_xsalsa20poly1305_NONCEBYTES crypto_secretbox_xsalsa20poly1305_ref_NONCEBYTES
#define crypto_secretbox_xsalsa20poly1305_ZEROBYTES crypto_secretbox_xsalsa20poly1305_ref_ZEROBYTES
#define crypto_secretbox_xsalsa20poly1305_BOXZEROBYTES crypto_secretbox_xsalsa20poly1305_ref_BOXZEROBYTES
#define crypto_secretbox_xsalsa20poly1305_IMPLEMENTATION "crypto_secretbox/xsalsa20poly1305/ref"
#ifndef crypto_secretbox_xsalsa20poly1305_ref_VERSION
#define crypto_secretbox_xsalsa20poly1305_ref_VERSION "-"
#endif
#define crypto_secretbox_xsalsa20poly1305_VERSION crypto_secretbox_xsalsa20poly1305_ref_VERSION

#endif