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cryptopals-challenges
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Implement fixed XOR

This commit is contained in:
Horseshoe Crab 2022-04-13 19:17:01 -07:00
parent 11bb1ef661
commit bdb02a337b
2 changed files with 35 additions and 3 deletions
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7
set1/Makefile
View File

@ -1,10 +1,11 @@
CC = gcc CC = gcc
CFLAGS = -Wall -Wpedantic -Wextra -std=c99 CFLAGS = -Wall -Wpedantic -Wextra -std=c99 -fstack-protector-all \
DEBUG = -g -fdiagnostics-color=auto
DEBUG = -0g -ggdb
LINK = LINK =
SRC_DIR = src SRC_DIR = src
OUT_DIR = bin OUT_DIR = bin
TARGETS = base64 TARGETS = base64 fixed-xor
all: $(TARGETS) all: $(TARGETS)

31
set1/src/fixed-xor.c Normal file
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@ -0,0 +1,31 @@
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
/*
void fixed_xor_stream(uint8_t *key, size_t key_len)
{
//
}
*/
void fixed_xor(const uint8_t *data, const uint8_t *key, const size_t key_len)
{
uint8_t c;
size_t i;
for (i = 0; i < key_len; ++i) {
c = data[i] ^ key[i];
putchar(c);
}
}
int main(int argc, char *argv[])
{
char data[] = "\x1c\x01\x11\x00\x1f\x01\x01\x00\x06\x1a\x02\x4b\x53\x53\x50\x09\x18\x1c";
char key[] = "\x68\x69\x74\x20\x74\x68\x65\x20\x62\x75\x6c\x6c\x27\x73\x20\x65\x79\x65";
fixed_xor(data, key, sizeof(key));
return EXIT_SUCCESS;
}