From 9c1ded3b0ae8e540177ee0c0baa1f9c8fcf91989 Mon Sep 17 00:00:00 2001
From: Martin Szulecki
Date: Wed, 18 Mar 2009 20:52:11 +0100
Subject: Initial commit of sources

---
 crypto.c | 70 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 70 insertions(+)
 create mode 100644 crypto.c

(limited to 'crypto.c')

diff --git a/crypto.c b/crypto.c
new file mode 100644
index 0000000..f8d4b1f
--- /dev/null
+++ b/crypto.c
@@ -0,0 +1,70 @@
+/**
+ * crypto.c
+ */
+
+#include <stddef.h>
+#ifdef __WIN32__
+/* todo */
+#else
+#include <openssl/md5.h>
+#include <openssl/sha.h>
+#include <openssl/aes.h>
+#endif
+#include <stdlib.h>
+#include <string.h>
+#include "crypto.h"
+#include "wii_tik.h"
+
+void get_common_key(u8 *key) {
+	u8 i;
+	u8 table[16] = {
+		0xC1, 0xce, 0x00, 0x08,
+		0x74, 0xaf, 0xb9, 0xce,
+		0x62, 0xf3, 0xef, 0x6f,
+		0x59, 0xab, 0x80, 0xdd
+	};
+	u8 v = 42;
+
+	for (i = 0; i < 16; i++)
+	{
+		key[i] = v ^ table[i];
+	}
+}
+
+void md5(u8 *data, u32 len, u8 *hash) {
+	MD5(data, len, hash);
+}
+
+void sha(u8 *data, u32 len, u8 *hash) {
+	SHA1(data, len, hash);
+}
+
+void aes_cbc_dec(u8 *key, u8 *iv, u8 *in, u32 len, u8 *out) {
+	AES_KEY aes_key;
+
+	AES_set_decrypt_key(key, 128, &aes_key);
+	AES_cbc_encrypt(in, out, len, &aes_key, iv, AES_DECRYPT);
+}
+
+void aes_cbc_enc(u8 *key, u8 *iv, u8 *in, u32 len, u8 *out) {
+	AES_KEY aes_key;
+
+	AES_set_encrypt_key(key, 128, &aes_key);
+	AES_cbc_encrypt(in, out, len, &aes_key, iv, AES_ENCRYPT);
+}
+
+void decrypt_title_key(wii_tik *tik, u8 *title_key) {
+	u8 common_key[16];
+	u8 iv[16];
+	u64 title_id_le;
+
+	get_common_key(common_key);
+
+	title_id_le = ((u64)tik->title_id << 32);
+	title_id_le += be32((u8*)&tik->title_category);
+
+	memset(iv, 0, sizeof(iv));
+	memcpy(iv, &title_id_le, 8);
+
+	aes_cbc_dec(common_key, iv, (u8*)tik->title_key_enc, 16, title_key);
+}
-- 
cgit v1.1-32-gdbae