Fixed matryoshka and print-flag

security-summer-school · Jun 26, 2024 · 24ba698 · 24ba698
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diff --git a/...ills/05-challenge-print-flag/src/Makefile → ...ills/05-challenge-print-flag/sol/Makefile b/...ills/05-challenge-print-flag/src/Makefile → ...ills/05-challenge-print-flag/sol/Makefile
diff --git a/...05-challenge-print-flag/src/get_message.c → ...05-challenge-print-flag/sol/get_message.c b/...05-challenge-print-flag/src/get_message.c → ...05-challenge-print-flag/sol/get_message.c
diff --git a/.../binary-analysis/executables-and-processes/drills/05-challenge-print-flag/src/get_message b/.../binary-analysis/executables-and-processes/drills/05-challenge-print-flag/src/get_message
diff --git a/...ills/06-challenge-matryoshka/src/Makefile → ...ills/06-challenge-matryoshka/sol/Makefile b/...ills/06-challenge-matryoshka/src/Makefile → ...ills/06-challenge-matryoshka/sol/Makefile
diff --git a/...challenge-matryoshka/src/do_xor_encrypt.c → ...challenge-matryoshka/sol/do_xor_encrypt.c b/...challenge-matryoshka/src/do_xor_encrypt.c → ...challenge-matryoshka/sol/do_xor_encrypt.c
diff --git a/...ry-analysis/executables-and-processes/drills/06-challenge-matryoshka/sol/do_xor_encrypt.o b/...ry-analysis/executables-and-processes/drills/06-challenge-matryoshka/sol/do_xor_encrypt.o
diff --git a/...s/drills/06-challenge-matryoshka/src/flag → ...s/drills/06-challenge-matryoshka/sol/flag b/...s/drills/06-challenge-matryoshka/src/flag → ...s/drills/06-challenge-matryoshka/sol/flag
diff --git a/...ters/binary-analysis/executables-and-processes/drills/06-challenge-matryoshka/sol/inner.c b/...ters/binary-analysis/executables-and-processes/drills/06-challenge-matryoshka/sol/inner.c
@@ -0,0 +1,29 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+static const unsigned char key[] = "I laugh in the face of danger";
+static const unsigned char enc_msg[] = { 0x1a, 0x73, 0x3f, 0x3e, 0x36, 0x33, 0x2e, 0x5b, 0x00, 0x00, 0x7f, 0x07, 0x18, 0x04, 0x43, 0x03, 0x3e, 0x0d, 0x0a, 0x7f, 0x00, 0x08, 0x45, 0x3b, 0x02, 0x0f, 0x09, 0x3a, 0x1a, 0x2c, 0x41, 0x1e, 0x3e, 0x0c, 0x08, 0x1d, 0x7f, 0x0b, 0x0b, 0x4c, 0x17, 0x00, 0x18, 0x2a, };
+
+static void xor_encrypt(const unsigned char *in, unsigned char *out,
+		size_t len, const unsigned char *key, size_t key_len)
+{
+	size_t i;
+
+	for (i = 0; i < len; i++)
+		out[i] = in[i] ^ key[i % key_len];
+}
+
+int main(void)
+{
+	unsigned char *dec_msg;
+
+	dec_msg = calloc(sizeof(enc_msg) + 1, sizeof(enc_msg[0]));
+
+	xor_encrypt(enc_msg, dec_msg, sizeof(enc_msg) / sizeof(enc_msg[0]),
+			key, strlen((const char *) key));
+
+	printf("Flag is: %s\n", dec_msg);
+
+	return 0;
+}
diff --git a/...ters/binary-analysis/executables-and-processes/drills/06-challenge-matryoshka/sol/inner.o b/...ters/binary-analysis/executables-and-processes/drills/06-challenge-matryoshka/sol/inner.o
diff --git a/...lls/06-challenge-matryoshka/src/inner_key → ...lls/06-challenge-matryoshka/sol/inner_key b/...lls/06-challenge-matryoshka/src/inner_key → ...lls/06-challenge-matryoshka/sol/inner_key
diff --git a/...challenge-matryoshka/src/inner_template.c → ...challenge-matryoshka/sol/inner_template.c b/...challenge-matryoshka/src/inner_template.c → ...challenge-matryoshka/sol/inner_template.c
diff --git a/...binary-analysis/executables-and-processes/drills/06-challenge-matryoshka/sol/matryoshka.c b/...binary-analysis/executables-and-processes/drills/06-challenge-matryoshka/sol/matryoshka.c
diff --git a/...binary-analysis/executables-and-processes/drills/06-challenge-matryoshka/sol/matryoshka.o b/...binary-analysis/executables-and-processes/drills/06-challenge-matryoshka/sol/matryoshka.o
diff --git a/...enge-matryoshka/src/matryoshka_template.c → ...enge-matryoshka/sol/matryoshka_template.c b/...enge-matryoshka/src/matryoshka_template.c → ...enge-matryoshka/sol/matryoshka_template.c
diff --git a/...s/binary-analysis/executables-and-processes/drills/06-challenge-matryoshka/src/matryoshka b/...s/binary-analysis/executables-and-processes/drills/06-challenge-matryoshka/src/matryoshka