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  1. The C code:
  2. #include <stdio.h>
  3. #include <unistd.h>
  4. #include <sys/stat.h>
  5. #include <sys/types.h>
  6. #include <openssl/sha.h>
  7.  
  8. /* start SHA256 hash functions */
  9. int _genSHA256Hash(char *path, char outputBuffer[65])
  10. {
  11. struct stat sb;
  12. if (stat(path, &sb) == -1) {
  13. perror("stat");
  14. return 0;
  15. }
  16.  
  17. FILE *file = fopen(path, "rb");
  18. if(!file) return -1;
  19.  
  20. unsigned char hash[SHA256_DIGEST_LENGTH];
  21. SHA256_CTX sha256;
  22. SHA256_Init(&sha256);
  23. const int bufSize = 32768;
  24. char *buffer = malloc(bufSize);
  25. int bytesRead = 0;
  26. if(!buffer) return -1;
  27. while((bytesRead = fread(buffer, 1, bufSize, file)))
  28. {
  29. SHA256_Update(&sha256, buffer, bytesRead);
  30. printf("percent done: %d of %zu\n", bytesRead, sb.st_size);
  31. }
  32. SHA256_Final(hash, &sha256);
  33.  
  34. sha256_hash_string(hash, outputBuffer);
  35.  
  36. fclose(file);
  37. free(buffer);
  38.  
  39. return 0;
  40. }
  41.  
  42. void sha256_hash_string (unsigned char hash[SHA256_DIGEST_LENGTH], char outputBuffer[65]) {
  43. int i = 0;
  44.  
  45. for(i = 0; i < SHA256_DIGEST_LENGTH; i++)
  46. {
  47. sprintf(outputBuffer + (i * 2), "%02x", hash[i]);
  48. }
  49.  
  50. outputBuffer[64] = 0;
  51. }
  52.  
  53. int main() {
  54. char buffer[60];
  55. _genSHA256Hash("example-livedvd.iso", buffer);
  56. printf("%s\n", buffer);
  57. }
  58.  
  59.  
  60.  
  61. The output:
  62. percent done: 32768 of 1108344832
  63. percent done: 32768 of 1108344832
  64. percent done: 32768 of 1108344832
  65. percent done: 32768 of 1108344832
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  128. ... truncated ...
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  157. 2e926343f55903060bb453d0d1d21158d92a623c21ad5f820cfa8f97095888bf
  158. [root@localhost ~]#
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