fat filesystem with disk encryption for sd card driver

1 files changed, 37 insertions, 0 deletions

diff --git a/crypto/aes/aes.h b/crypto/aes/aes.h
new file mode 100644
index 0000000..f6dd079
--- /dev/null
+++ b/crypto/aes/aes.h
@@ -0,0 +1,37 @@
+#ifndef _AES_H_
+#define _AES_H_
+
+#include <stdint.h>
+#include <stddef.h>
+
+#define AES128 1
+//#define AES192 1
+//#define AES256 1
+
+#define AES_BLOCKLEN 16 // Block length in bytes - AES is 128b block only
+
+#if defined(AES256) && (AES256 == 1)
+    #define AES_KEYLEN 32
+    #define AES_KEYEXPSIZE 240
+#elif defined(AES192) && (AES192 == 1)
+    #define AES_KEYLEN 24
+    #define AES_KEYEXPSIZE 208
+#else
+    #define AES_KEYLEN 16   // Key length in bytes
+    #define AES_KEYEXPSIZE 176
+#endif
+
+typedef struct
+{
+  uint8_t RoundKey[AES_KEYEXPSIZE];
+} AESCtx;
+
+void aes_init(AESCtx *ctx, uint8_t *key);
+// buffer size is exactly AES_BLOCKLEN bytes;
+void aes_ecb_encrypt(AESCtx *ctx, uint8_t *buf);
+void aes_ecb_decrypt(AESCtx *ctx, uint8_t *buf);
+// buffer size MUST be mutile of AES_BLOCKLEN;
+void aes_cbc_encrypt(AESCtx *ctx, uint8_t *iv, uint8_t *buf, size_t length);
+void aes_cbc_decrypt(AESCtx *ctx, uint8_t *iv, uint8_t *buf, size_t length);
+
+#endif
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