From 77366d97363401c4a2df33d1b301ac448b777af1 Mon Sep 17 00:00:00 2001
From: Billy Brawner <billybrawner@gmail.com>
Date: Fri, 13 Apr 2018 08:29:17 -0500
Subject: [PATCH] Begin OpenSSL AES Key transformation

---
 crypto-openssl.c | 52 +++++++++++++++++++++++++++++++++++++++++++-----
 sha256.c         | 40 +++++++++++++++++++++++++++++++++++++
 2 files changed, 87 insertions(+), 5 deletions(-)
 create mode 100644 sha256.c

diff --git a/crypto-openssl.c b/crypto-openssl.c
index b8a3b36..ef1801d 100755
--- a/crypto-openssl.c
+++ b/crypto-openssl.c
@@ -45,17 +45,59 @@
 #include "mod0keecrack.h"
 
 
-int aes_transformkey(m0_kdbx_header_entry_t *hdr, uint8_t *tkey, size_t tkeylen) {
+int aes_transformkey(m0_kdbx_header_entry_t *hdr, uint8_t *tkey, size_t tkeylen) 
+{
+  uint64_t          rounds         = 0;
 
+  EVP_CIPHER_CTX *ctx = EVP_CIPHER_CTX_new();
+
+  EVP_EncryptInit_ex(
+          ctx,
+          EVP_aes_128_ecb(),
+          NULL,
+          key,
+          NULL);
+
+  EVP_EncryptUpdate(
+          ctx,
+          NULL,
+          0,
+          tkey,
+          tkeylen);
+
+
+  for(rounds = 0; rounds < hdr[TRANSFORMROUNDS].qw; rounds++) {
+  }
+
+cleanup:
+  if (ctx) {
+      EVP_CIPHER_CTX_free(ctx);
+  }
 }
 
-int aes_decrypt_check(m0_kdbx_header_entry_t *hdr, uint8_t *masterkey, m0_kdbx_payload_t *p) {
+bool aes_decrypt_check(m0_kdbx_header_entry_t *hdr, uint8_t *masterkey, m0_kdbx_payload_t *p) {
 
 }
 
 int sha256_hash(uint8_t *hash, uint8_t *data, size_t len) {
     EVP_MD_CTX *ctx = EVP_MD_CTX_new();
-    EVP_DigestInit(ctx, EVP_sha256());
-    EVP_DigestUpdate(ctx, data, len);
-    EVP_DigestFinal(ctx, hash, NULL);
+
+    EVP_DigestInit(
+            ctx, 
+            EVP_sha256()
+            );
+
+    EVP_DigestUpdate(
+            ctx, 
+            data, 
+            len
+            );
+
+    EVP_DigestFinal(
+            ctx, 
+            hash, 
+            NULL
+            );
+
+    return 0;
 }
diff --git a/sha256.c b/sha256.c
new file mode 100644
index 0000000..38a6a6c
--- /dev/null
+++ b/sha256.c
@@ -0,0 +1,40 @@
+/*
+ * =====================================================================================
+ *
+ *       Filename:  sha256.c
+ *
+ *    Description:  An OpenSSL SHA256 Utility
+ *
+ *        Version:  1.0
+ *        Created:  04/03/2018 06:13:41 PM
+ *       Revision:  none
+ *       Compiler:  gcc
+ *
+ *         Author:  William Brawner (Billy), billybrawner@gmail.com
+ *   Organization:  
+ *
+ * =====================================================================================
+ */
+#include <openssl/evp.h>
+#include <stdlib.h>
+#include <string.h>
+#include "helper.h"
+
+int main(int argc, char ** argv) {
+    if (argc < 2) {
+        printf("Please enter a string to hash\n");
+        return 1;
+    }
+
+    printf("You entered %s\n", argv[1]);
+    printf("Your string contains %d characters\n", strlen(argv[1]));
+
+    EVP_MD_CTX *ctx = EVP_MD_CTX_new();
+    EVP_DigestInit(ctx, EVP_sha256());
+    EVP_DigestUpdate(ctx, argv[1], strlen(argv[1]));
+    char* hash = malloc(EVP_MD_CTX_size(ctx));
+    EVP_DigestFinal(ctx, hash, NULL);
+    printf("Your hashed string: ");
+    print_hex_buf(hash, 32);
+    printf("\n");
+}