commit 71ac60e9be73526d8564c0948c09cdf594b1f4d4
parent 03eb6a68660664fdc45934404d1b3a06cc23d51c
Author: anna <anna@brokenlove.online>
Date: Wed, 7 Aug 2024 22:14:22 +0200
update ex 3 and 4
Diffstat:
A | s1/4.txt | | | 328 | +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ |
M | s1/build.sh | | | 2 | +- |
M | s1/c3.c | | | 37 | +++++-------------------------------- |
A | s1/c4.c | | | 45 | +++++++++++++++++++++++++++++++++++++++++++++ |
4 files changed, 379 insertions(+), 33 deletions(-)
diff --git a/s1/4.txt b/s1/4.txt
@@ -0,0 +1,327 @@
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diff --git a/s1/build.sh b/s1/build.sh
@@ -2,5 +2,5 @@
for filename in *.c; do
echo "compiling $filename"
- gcc -lba -o "bin/$(basename $filename .c)" $filename
+ gcc -lba -lcryptanalysis -g -o "bin/$(basename $filename .c)" $filename
done
diff --git a/s1/c3.c b/s1/c3.c
@@ -1,45 +1,18 @@
-#include <ba.h>
#include <stdlib.h>
#include <ctype.h>
+#include <ba.h>
+#include <cryptanalysis.h>
-int score_english(ba *text)
+int main(int argc, char* argv[])
{
- int res = 0;
- for (int i = 0; i < text->len; i++)
- res += isalnum((text->val)[i]) || isspace((text->val)[i]);
- return res;
-}
-
-int main(int argc, char* argv[]) {
if (argc != 2)
return -1;
-
ba *ct;
- ba *key;
ct = ba_from_hex(argv[1]);
- uint8_t best_key;
- int max = 0;
if (!ct)
return -1;
- printf("decrypting...\n");
- for (uint16_t i = 0; i < 0xff; i++) {
- char buf[2*(ct->len)];
- snprintf(buf, 16, "%2x", i);
- key = ba_from_hex_n(buf, ct->len);
- ba_xor(key, ct);
- int sc = score_english(key);
- if (sc > max) {
- max = sc;
- best_key = i;
- }
- }
-
- char buf[2*(ct->len)];
- snprintf(buf, 16, "%2x", best_key);
- key = ba_from_hex_n(buf, ct->len);
- ba_xor(key, ct);
- ba_fprint_ascii(key, stdout, 0);
+ ct = decrypt_scxor(ct);
+ ba_fprint_ascii(ct, stdout, 0);
printf("\n");
-
ba_free(ct);
}
diff --git a/s1/c4.c b/s1/c4.c
@@ -0,0 +1,45 @@
+#include <stdio.h>
+#include <ctype.h>
+#include <ba.h>
+#include <cryptanalysis.h>
+
+#define MAXLEN 1000
+
+void preprocess_string(char (*l)[MAXLEN])
+{
+ while (isspace(**l))
+ *l++;
+ for (int i = 0; i < strlen(*l); i++) {
+ if ((*l)[i] == '\n') {
+ (*l)[i] = '\0';
+ break;
+ }
+ }
+}
+
+int main(int argc, char* argv[])
+{
+ if (argc != 2)
+ return -1;
+ FILE *p = fopen(argv[1], "r");
+ char l[MAXLEN];
+ //char best[MAXLEN];
+ unsigned long maxscore = 0;
+ ba *ct;
+ ba *best = (ba *) malloc(sizeof(ba));
+ while (fgets(l, sizeof(l), p)) {
+ preprocess_string(&l);
+ ct = ba_from_hex(l);
+ ct = decrypt_scxor(ct);
+ unsigned long score = score_english(ct);
+ if (score > maxscore) {
+ maxscore = score;
+ ba_copy(best, ct);
+ //strcpy(best, l);
+ }
+ }
+ ba_fprint_ascii(best, stdout, 0);
+ printf("\n");
+
+ ba_free(ct);
+}