BLAKE3 (a more efficient verification method than MD5)

#include ""
#include <>
#include <>
#include <>
#include <>

int main(void) {
  // Initialize the hasher.
  blake3_hasher hasher;
  blake3_hasher_init(&hasher);

  // Read input bytes from stdin.
  unsigned char buf[65536];
  while (1) {
    ssize_t n = read(STDIN_FILENO, buf, sizeof(buf));
    if (n > 0) {
      blake3_hasher_update(&hasher, buf, n);
    } else if (n == 0) {
      break; // end of file
    } else {
      fprintf(stderr, "read failed: %s\n", strerror(errno));
      return 1;
    }
  }

  // Finalize the hash. BLAKE3_OUT_LEN is the default output length, 32 bytes.
  uint8_t output[BLAKE3_OUT_LEN];
  blake3_hasher_finalize(&hasher, output, BLAKE3_OUT_LEN);

  // Print the hash as hexadecimal.
  for (size_t i = 0; i < BLAKE3_OUT_LEN; i++) {
    printf("%02x", output[i]);
  }
  printf("\n");
  return 0;
}
gcc -O3 -o example   blake3_dispatch.c blake3_portable.c \
    blake3_sse2_x86-64_unix.S blake3_sse41_x86-64_unix.S blake3_avx2_x86-64_unix.S \
    blake3_avx512_x86-64_unix.S

wzh@wzh:~/work/BLAKE3/c$ ls -l
total 1332
-rw-rw-r-- 1 wzh wzh  12452  3moon 21 16:59 blake3_avx2.c
-rw-rw-r-- 1 wzh wzh  66050  3moon 21 16:59 blake3_avx2_x86-64_unix.S
-rw-rw-r-- 1 wzh wzh  66735  3moon 21 16:59 blake3_avx2_x86-64_windows_gnu.S
-rw-rw-r-- 1 wzh wzh  65948  3moon 21 16:59 blake3_avx2_x86-64_windows_msvc.asm
-rw-rw-r-- 1 wzh wzh  54592  3moon 21 16:59 blake3_avx512.c
-rw-rw-r-- 1 wzh wzh 161672  3moon 21 16:59 blake3_avx512_x86-64_unix.S
-rw-rw-r-- 1 wzh wzh  91003  3moon 21 16:59 blake3_avx512_x86-64_windows_gnu.S
-rw-rw-r-- 1 wzh wzh  91605  3moon 21 16:59 blake3_avx512_x86-64_windows_msvc.asm
-rw-rw-r-- 1 wzh wzh  28903  3moon 21 16:59 
-rw-rw-r-- 1 wzh wzh    108  3moon 21 16:59 
drwxrwxr-x 4 wzh wzh   4096  3moon 21 16:59 blake3_c_rust_bindings
-rw-rw-r-- 1 wzh wzh   9165  3moon 21 16:59 blake3_dispatch.c
-rw-rw-r-- 1 wzh wzh   2901  3moon 21 16:59 
-rw-rw-r-- 1 wzh wzh  12030  3moon 21 16:59 blake3_impl.h
-rw-rw-r-- 1 wzh wzh  13833  3moon 21 16:59 blake3_neon.c
-rw-rw-r-- 1 wzh wzh   5889  3moon 21 16:59 blake3_portable.c
-rw-rw-r-- 1 wzh wzh  21005  3moon 21 16:59 blake3_sse2.c
-rw-rw-r-- 1 wzh wzh  68858  3moon 21 16:59 blake3_sse2_x86-64_unix.S
-rw-rw-r-- 1 wzh wzh  71202  3moon 21 16:59 blake3_sse2_x86-64_windows_gnu.S
-rw-rw-r-- 1 wzh wzh  70982  3moon 21 16:59 blake3_sse2_x86-64_windows_msvc.asm
-rw-rw-r-- 1 wzh wzh  20813  3moon 21 16:59 blake3_sse41.c
-rw-rw-r-- 1 wzh wzh  61143  3moon 21 16:59 blake3_sse41_x86-64_unix.S
-rw-rw-r-- 1 wzh wzh  63459  3moon 21 16:59 blake3_sse41_x86-64_windows_gnu.S
-rw-rw-r-- 1 wzh wzh  63194  3moon 21 16:59 blake3_sse41_x86-64_windows_msvc.asm
-rw-rw-r-- 1 wzh wzh   1301  3moon 21 16:59 blake3_tbb.cpp
drwxrwxr-x 3 wzh wzh   4096  3moon 21 16:59 cmake
-rw-rw-r-- 1 wzh wzh  13364  3moon 21 16:59 
-rw-rw-r-- 1 wzh wzh   1848  3moon 21 16:59 
drwxrwxr-x 3 wzh wzh   4096  3moon 21 16:59 dependencies
-rwxrwxr-x 1 wzh wzh 101888  3moon 21 16:59 example
-rw-rw-r-- 1 wzh wzh    868  3moon 21 16:59 
-rw-rw-r-- 1 wzh wzh   1625  3moon 21 16:59 example_tbb.c
-rw-rw-r-- 1 wzh wzh    314  3moon 21 16:59 
-rw-rw-r-- 1 wzh wzh   4043  3moon 21 16:59 
-rw-rw-r-- 1 wzh wzh   2057  3moon 21 16:59 
-rw-rw-r-- 1 wzh wzh  13644  3moon 21 16:59 
-rwxrwxr-x 1 wzh wzh   3654  3moon 21 16:59 
wzh@wzh:~/work/BLAKE3/c$ echo "Hello, World!" | ./example 
6233834bce7817db1e401bceea2b8b45c1600115d25b51906c05ee32156b51c2
wzh@wzh:~/work/BLAKE3/c$ echo "Hello, World!" | ./example 
6233834bce7817db1e401bceea2b8b45c1600115d25b51906c05ee32156b51c2
wzh@wzh:~/work/BLAKE3/c$