63 lines
1.4 KiB
C
63 lines
1.4 KiB
C
#include "utils.h"
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#include <ctype.h>
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#include <stdio.h>
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int main(int argc, char *argv[]) {
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if (argc < 2) {
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printf("Usage: %s <filename>\n", argv[0]);
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return EXIT_FAILURE;
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}
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FILE *fp = fopen(argv[1], "r");
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if (fp == NULL) {
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printf("Error opening file %s\n", argv[1]);
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return EXIT_FAILURE;
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}
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printf("line | key | score | cleartext\n");
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printf("-----+-----+-------+-------------------------------\n");
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unsigned int line_count = 0;
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char *line = NULL;
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size_t line_length = 0;
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ssize_t nread = 0;
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size_t len;
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while ((nread = getline(&line, &line_length, fp)) != -1) {
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line_count++;
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line[60] = '\0';
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// printf("%3u: %s\n", line_count, line);
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unsigned char buf[512] = {0};
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len = hex_to_bytes(buf, line);
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unsigned char cur[512] = {'\0'};
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for (char c = 32; c < 127; ++c) {
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for (size_t i = 0; i < len; ++i) {
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cur[i] = buf[i] ^ c;
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}
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double score = frequency_score(cur, len);
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if (score < 40.0) {
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printf("%4u | %c | %5.1f | ", line_count, c,
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score);
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for (size_t i = 0; i < len; ++i) {
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if (isprint(cur[i])) {
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putchar(cur[i]);
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} else if (cur[i] == '\n') {
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printf("\\n");
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}
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}
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printf("\n");
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}
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}
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}
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free(line);
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if (fclose(fp)) {
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printf("Error closing file %s\n", argv[1]);
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return EXIT_FAILURE;
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}
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return EXIT_SUCCESS;
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}
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