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      1 
      2 #ifndef stream_chacha20_H
      3 #define stream_chacha20_H
      4 
      5 #include <stdint.h>
      6 
      7 typedef struct crypto_stream_chacha20_implementation {
      8     int (*stream)(unsigned char *c, unsigned long long clen,
      9                   const unsigned char *n, const unsigned char *k);
     10     int (*stream_ietf)(unsigned char *c, unsigned long long clen,
     11                       const unsigned char *n, const unsigned char *k);
     12     int (*stream_xor_ic)(unsigned char *c, const unsigned char *m,
     13                          unsigned long long mlen,
     14                          const unsigned char *n, uint64_t ic,
     15                          const unsigned char *k);
     16     int (*stream_ietf_xor_ic)(unsigned char *c, const unsigned char *m,
     17                               unsigned long long mlen,
     18                               const unsigned char *n, uint32_t ic,
     19                               const unsigned char *k);
     20 } crypto_stream_chacha20_implementation;
     21 
     22 #endif
     23