Diff: small_aes.h

Revision:

0:27d3a972ad80

Child:

1:0075ec28b9dd

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/small_aes.h	Wed Oct 10 14:09:25 2012 +0000
@@ -0,0 +1,131 @@
+/* small_aes.h
+ *
+ * Copyright (c) 2012  Rafael Azuero Hurtado - German Londoño Paez
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>. 
+ */
+
+/** 
+* @file small_aes.h
+* @brief Small AES with T-box
+*/
+
+#ifndef _SMALL_AES_H_
+#define _SMALL_AES_H_
+
+#include "mbed.h"
+
+#ifdef __cplusplus
+    extern "C" {
+#endif
+
+enum {
+    SMALL_AES_ENCRYPTION = 0,
+    SMALL_AES_DECRYPTION = 1,
+    SMALL_AES_BLOCK_SIZE = 16
+};
+
+typedef struct AES {    
+    unsigned int key[60];
+    unsigned int  rounds;
+    
+    unsigned int reg[SMALL_AES_BLOCK_SIZE / sizeof(unsigned int)];    
+} AES;
+
+/**
+* @fn int aesSetKey(AES* aes, const unsigned char *key, unsigned int len, int dir)
+* @brief Sets AES key
+* @param aes The AES struct
+* @param key The key bytes
+* @param len The Key length
+* @param dir If encrypt or decrypt
+*/
+int aesSetKey(AES* aes, const unsigned char *key, unsigned int len, int dir);
+
+/**
+* @fn void aesEncrypt(AES* aes, const unsigned char *inBlock, unsigned char *outBlock)
+* @brief Encrypts a 16-byte block
+* @param aes The AES struct
+* @param inBlock The 16-byte input block
+* @param outBlock The 16-byte output block
+*/
+void aesEncrypt(AES* aes, const unsigned char *inBlock, unsigned char *outBlock);
+
+/**
+* @fn void aesDecrypt(AES* aes, const unsigned char *inBlock, unsigned char *outBlock)
+* @brief Decrypts a 16-byte block
+* @param aes The AES struct
+* @param inBlock The 16-byte input block
+* @param outBlock The 16-byte output block
+*/
+void aesDecrypt(AES* aes, const unsigned char *inBlock, unsigned char *outBlock);
+
+/**
+* @fn void aesEcbEncrypt(AES* aes, unsigned char *output, const unsigned char *input, unsigned int inputSize)
+* @brief Encrypts a n-byte block with AES-ECB
+* @param aes The AES struct
+* @param output The input data
+* @param input The output data
+* @param inputSize The input data size in bytes
+*/
+void aesEcbEncrypt(AES* aes, unsigned char *output, const unsigned char *input, unsigned int inputSize);
+
+/**
+* @fn void aesEcbDecrypt(AES* aes, unsigned char *output, const unsigned char *input, unsigned int inputSize)
+* @brief Decrypts a n-bytes block with AES-ECB
+* @param aes The AES struct
+* @param output The input data
+* @param input The output data
+* @param inputSize The input data size in bytes
+*/
+void aesEcbDecrypt(AES* aes, unsigned char *output, const unsigned char *input, unsigned int inputSize);
+
+/**
+* @fn unsigned int byteReverseWord32(unsigned int value)
+* @brief Converts a  big-endian 32-bit word to little-endian format
+* @param value The big-endian 32-bit word
+*/
+unsigned int byteReverseWord32(unsigned int value);
+
+/**
+* @fn void byteReverseWords(unsigned int *out, const unsigned int *in, unsigned int byteCount)
+* @brief Converts a big-endian block to little-endian format
+* @param out The output block
+* @param in The input block
+* @param byteCount The Number of bytes
+*/
+void byteReverseWords(unsigned int *out, const unsigned int *in, unsigned int byteCount);
+
+/**
+* @fn unsigned int rotlFixed(unsigned int x, unsigned int y)
+* @brief Rotates a 32-bit word n-bytes to the left
+* @param x The32-bit word
+* @param y The number of bytes to rotate
+*/
+unsigned int rotlFixed(unsigned int x, unsigned int y);
+
+/**
+* @fn unsigned int rotrFixed(unsigned int x, unsigned int y)
+* @brief Rotates a 32-bit word n-bytes to the right
+* @param x The 32-bit word
+* @param y The number of bytes to rotate
+*/
+unsigned int rotrFixed(unsigned int x, unsigned int y);
+
+
+#ifdef __cplusplus
+    } /* extern "C" */
+#endif
+
+#endif
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