4.58 beta

C/Aes.h

@@ -0,0 +1,48 @@
+/* Aes.h -- AES encryption / decryption
+2008-03-26
+Igor Pavlov
+Public domain */
+
+#ifndef __AES_H
+#define __AES_H
+
+#include "Types.h"
+
+#define AES_BLOCK_SIZE 16
+
+typedef struct
+{
+  unsigned numRounds2; /* = numRounds / 2 */
+  UInt32 rkey[(14 + 1) * 4];
+} CAes;
+
+/* Call AesGenTables one time before other AES functions */
+void AesGenTables(void);
+
+/* keySize = 16 or 24 or 32 (bytes) */
+void Aes_SetKeyEncode(CAes *p, const Byte *key, unsigned keySize); 
+void Aes_SetKeyDecode(CAes *p, const Byte *key, unsigned keySize);
+
+/* Aes_Encode32 and Aes_Decode32 functions work with little-endian words.
+  src and dest are pointers to 4 UInt32 words.
+  arc and dest can point to same block */
+void Aes_Encode32(const CAes *p, UInt32 *dest, const UInt32 *src);
+void Aes_Decode32(const CAes *p, UInt32 *dest, const UInt32 *src);
+
+typedef struct
+{
+  UInt32 prev[4];
+  CAes aes;
+} CAesCbc;
+
+void AesCbc_Init(CAesCbc *p, const Byte *iv); /* iv size is AES_BLOCK_SIZE */
+
+/* AesCbc_Encode and AesCbc_Decode:
+  if (res <= size): Filter have converted res bytes
+  if (res > size):  Filter have not converted anything. And it needs at 
+                    least res = AES_BLOCK_SIZE bytes to convert one block */ 
+
+SizeT AesCbc_Encode(CAesCbc *p, Byte *data, SizeT size);
+SizeT AesCbc_Decode(CAesCbc *p, Byte *data, SizeT size);
+
+#endif