From 2d7ba032a8912511c5ce568ffd7fff08001ad28c Mon Sep 17 00:00:00 2001
From: HeshamTB <hishaminv@gmail.com>
Date: Tue, 7 Jun 2022 14:43:43 +0300
Subject: [PATCH] encryption: scrapped attempt for BT encryption on esp32

Signed-off-by: HeshamTB <hishaminv@gmail.com>
---
 encryption/encryption.c | 33 +++++++++++++++++++++++++++++++++
 encryption/encryption.h | 24 ++++++++++++++++++++++++
 2 files changed, 57 insertions(+)
 create mode 100644 encryption/encryption.c
 create mode 100644 encryption/encryption.h

diff --git a/encryption/encryption.c b/encryption/encryption.c
new file mode 100644
index 0000000..153d4f1
--- /dev/null
+++ b/encryption/encryption.c
@@ -0,0 +1,33 @@
+/* 
+ * Wrapper around mbedtls to provide AES encryption
+ *
+ * Needs esp32 arduino platform libraries
+ *
+ * Hesham T. Banafa 
+ * May 9th, 2022
+ *
+ */
+#include <string.h>
+#include "encryption.h"
+
+static int valid_time(long long time_epoch);
+
+extern void aes_init(aes_t *ctx, char *key)
+{
+    mbedtls_aes_init(&ctx->aes_ctx);
+    //mbedtls_aes_setkey_enc(ctx->aes_ctx, (const unsigned char*)key, strlen(key) * 8 );
+    ctx->psk_key = key; // Save key ptr
+}
+
+extern void aes_encrypt(aes_t *ctx, char *plain_text, char *out_buf)
+{
+    if (ctx == NULL) return; // What are you doing? out_buf remains as is.
+    mbedtls_aes_setkey_enc(&ctx->aes_ctx, (const unsigned char*)ctx->psk_key, strlen(ctx->psk_key) * 8 );
+    mbedtls_aes_crypt_ecb(&ctx->aes_ctx, MBEDTLS_AES_ENCRYPT, (const unsigned char*)plain_text, (unsigned char*)out_buf);
+}
+
+extern void aes_decrypt(aes_t *ctx, char *cipher_text, char *out_buf) 
+{
+    
+}
+
diff --git a/encryption/encryption.h b/encryption/encryption.h
new file mode 100644
index 0000000..c83620f
--- /dev/null
+++ b/encryption/encryption.h
@@ -0,0 +1,24 @@
+/* 
+ * Wrapper around mbedtls to provide AES encryption
+ *
+ * Needs esp32 arduino platform libraries
+ *
+ * Hesham T. Banafa 
+ * May 9th, 2022
+ *
+ */
+
+#include "mbedtls/aes.h"
+
+typedef struct aes_t 
+{
+    const char *psk_key;
+    mbedtls_aes_context aes_ctx;
+} aes_t;
+
+static int valid_time(long long time_epoch);
+
+extern void aes_init(aes_t *ctx, char *key);
+extern void aes_encrypt(aes_t *ctx, char *plain_text, char *out_buf);
+extern void aes_decrypt(aes_t *ctx, char *cipher_text, char *out_buf);
+