86 lines
1.5 KiB
C
86 lines
1.5 KiB
C
#include "sha256.h"
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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static int hash_file(const char *path);
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static const char *prompt_file(void);
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static char *showDigest(unsigned char *digest, int len, char *out);
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static void chomp(char *str);
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int main(int argc, char *argv[])
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{
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int status = EXIT_SUCCESS;
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if (argc > 1) {
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int i;
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fprintf(stderr, "Hashing...\n");
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for (i = 1; i < argc; i++) {
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if (hash_file(argv[i]) != 0)
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status = EXIT_FAILURE;
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}
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} else {
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const char *path = prompt_file();
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fprintf(stderr, "Hashing %s\n", path);
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if (hash_file(path) != 0)
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status = EXIT_FAILURE;
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}
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return status;
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}
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static int hash_file(const char *path)
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{
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unsigned char digest[SHA256_HASH_SIZE];
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char buffer[sizeof(digest) * 2 + 1];
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if (SHA256File(path, digest) != 0) {
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perror(path);
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return -1;
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}
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printf("%s\n %s\n", showDigest(digest, sizeof(digest), buffer), path);
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return 0;
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}
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static const char *prompt_file(void)
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{
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static char buffer[1024];
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printf("File: ");
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if (fgets(buffer, sizeof(buffer), stdin) == NULL) {
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fprintf(stderr, "No file path given\n");
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exit(EXIT_FAILURE);
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}
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chomp(buffer);
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return buffer;
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}
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static char *showDigest(unsigned char *digest, int len, char *out)
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{
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static const char hex[16] = "0123456789abcdef";
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char *ret = out;
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while (len--) {
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unsigned char b = *digest++;
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*out++ = hex[b >> 4];
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*out++ = hex[b & 0xF];
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}
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*out = 0;
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return ret;
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}
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static void chomp(char *str)
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{
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char *end = strchr(str, '\0');
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if (end > str && end[-1] == '\n')
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end[-1] = '\0';
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} |