Just some hashing stuff

md160.c

#include <stdio.h>
#include <stdlib.h>
#include <errno.h>
#include <string.h>
#include <openssl/ripemd.h>

int main(int argc, const char* argv[]) {
  FILE* file;
	int length;
	unsigned char* buffer;
	unsigned char hash[RIPEMD160_DIGEST_LENGTH] = { 0 };

	if (argc != 2)
		return 1;

	if (!(file = fopen(argv[1], "r"))) {
		fprintf(stderr, "open failed:\n%s\n", strerror(errno));
		return 1;
	}

	if (fseek(file, 0, SEEK_END) == -1) {
		fprintf(stderr, "Seek failed:\n%s\n", strerror(errno));
		return 1;
	}

	if ((length = ftell(file)) == -1) {
		fprintf(stderr, "tell failed:\n%s\n", strerror(errno));
		return 1;
	}

	if (fseek(file, 0, SEEK_SET) == -1) {
		fprintf(stderr, "set fialed:\n%s\n", strerror(errno));
		return 1;
	}

	if (!(buffer = calloc(1, length))) {
		fprintf(stderr, "alloc failed:\n%s\n", strerror(errno));
		return 1;
	}

	if (fread(buffer, 1, length, file) != length) {
		fprintf(stderr, "read failed:\n%s\n", strerror(errno));
		return 1;
	}

	fclose(file);

	// Do the hashing
	RIPEMD160(buffer, length, hash);

	// print out the sha
	for (int i = 0; i < RIPEMD160_DIGEST_LENGTH; i++) {
		printf("%02x", hash[i]);
	}
	printf("\n");

	return 0;
}