cryptopals_c

cryptopals crypto challenges solutions in pure c
git clone git://git.superpozycja.net/cryptopals_c
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commit 71ac60e9be73526d8564c0948c09cdf594b1f4d4
parent 03eb6a68660664fdc45934404d1b3a06cc23d51c
Author: anna <anna@brokenlove.online>
Date:   Wed,  7 Aug 2024 22:14:22 +0200

update ex 3 and 4

Diffstat:
As1/4.txt | 328+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Ms1/build.sh | 2+-
Ms1/c3.c | 37+++++--------------------------------
As1/c4.c | 45+++++++++++++++++++++++++++++++++++++++++++++
4 files changed, 379 insertions(+), 33 deletions(-)

diff --git a/s1/4.txt b/s1/4.txt @@ -0,0 +1,327 @@ +0e3647e8592d35514a081243582536ed3de6734059001e3f535ce6271032 +334b041de124f73c18011a50e608097ac308ecee501337ec3e100854201d +40e127f51c10031d0133590b1e490f3514e05a54143d08222c2a4071e351 +45440b171d5c1b21342e021c3a0eee7373215c4024f0eb733cf006e2040c +22015e420b07ef21164d5935e82338452f42282c1836e42536284c450de3 +043b452e0268e7eb005a080b360f0642e6e342005217ef04a42f3e43113d +581e0829214202063d70030845e5301f5a5212ed0818e22f120b211b171b +ea0b342957394717132307133f143a1357e9ed1f5023034147465c052616 +0c300b355c2051373a051851ee154a023723414c023a08171e1b4f17595e +550c3e13e80246320b0bec09362542243be42d1d5d060e203e1a0c66ef48 +e159464a582a6a0c50471310084f6b1703221d2e7a54502b2b205c433afa +ec58ea200e3005090e1725005739eda7342aed311001383fff7c58ef1f11 +01305424231c0d2c41f105057f74510d335440332f1038ec17275f5814e1 +05f12f380720ea2b19e24a07e53c142128354e2827f25a08fb401c3126a6 +0d17272f53063954163d050a541b1f1144305ae37d4932431b1f33140b1b 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(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); +}