threema-ios/NaClCrypto/nacl/crypto_box/curve25519xsalsa20poly1305/ref/api.h

#define CRYPTO_PUBLICKEYBYTES 32
#define CRYPTO_SECRETKEYBYTES 32
#define CRYPTO_BEFORENMBYTES 32
#define CRYPTO_NONCEBYTES 24
#define CRYPTO_ZEROBYTES 32
#define CRYPTO_BOXZEROBYTES 16