From 20894622729c9cfbde2fb1f6fcbfead473ef843b Mon Sep 17 00:00:00 2001
From: Matteo Brichese <matteo.brichese@wunderbar.com>
Date: Tue, 6 Jun 2017 11:10:33 -0700
Subject: adding aes256 aes192 options

---
 aes.c | 36 +++++++++++++-----------------------
 1 file changed, 13 insertions(+), 23 deletions(-)

(limited to 'aes.c')

diff --git a/aes.c b/aes.c
index bb026fd..3171cdc 100644
--- a/aes.c
+++ b/aes.c
@@ -448,16 +448,6 @@ static void InvCipher(void)
   AddRoundKey(0);
 }
 
-static void BlockCopy(uint8_t* output, const uint8_t* input)
-{
-  uint8_t i;
-  for (i=0;i<KEYLEN;++i)
-  {
-    output[i] = input[i];
-  }
-}
-
-
 
 /*****************************************************************************/
 /* Public functions:                                                         */
@@ -465,10 +455,10 @@ static void BlockCopy(uint8_t* output, const uint8_t* input)
 #if defined(ECB) && ECB
 
 
-void AES_ECB_encrypt(const uint8_t* input, const uint8_t* key, uint8_t* output)
+void AES_ECB_encrypt(const uint8_t* input, const uint8_t* key, uint8_t* output, const uint32_t length)
 {
   // Copy input to output, and work in-memory on output
-  BlockCopy(output, input);
+  memcpy(output, input, length);
   state = (state_t*)output;
 
   Key = key;
@@ -478,10 +468,10 @@ void AES_ECB_encrypt(const uint8_t* input, const uint8_t* key, uint8_t* output)
   Cipher();
 }
 
-void AES_ECB_decrypt(const uint8_t* input, const uint8_t* key, uint8_t *output)
+void AES_ECB_decrypt(const uint8_t* input, const uint8_t* key, uint8_t *output, const uint32_t length)
 {
   // Copy input to output, and work in-memory on output
-  BlockCopy(output, input);
+  memcpy(output, input, length);
   state = (state_t*)output;
 
   // The KeyExpansion routine must be called before encryption.
@@ -504,7 +494,7 @@ void AES_ECB_decrypt(const uint8_t* input, const uint8_t* key, uint8_t *output)
 static void XorWithIv(uint8_t* buf)
 {
   uint8_t i;
-  for(i = 0; i < KEYLEN; ++i)
+  for(i = 0; i < 16; ++i) //WAS for(i = 0; i < KEYLEN; ++i) but the block in AES is always 128bit so 16 bytes!
   {
     buf[i] ^= Iv[i];
   }
@@ -515,7 +505,7 @@ void AES_CBC_encrypt_buffer(uint8_t* output, uint8_t* input, uint32_t length, co
   uintptr_t i;
   uint8_t remainders = length % KEYLEN; /* Remaining bytes in the last non-full block */
 
-  BlockCopy(output, input);
+  memcpy(output, input, KEYLEN);
   state = (state_t*)output;
 
   // Skip the key expansion if key is passed as 0
@@ -530,10 +520,10 @@ void AES_CBC_encrypt_buffer(uint8_t* output, uint8_t* input, uint32_t length, co
     Iv = (uint8_t*)iv;
   }
 
-  for(i = 0; i < length; i += KEYLEN)
+  for(i = 0; i < length-remainders; i += KEYLEN)
   {
     XorWithIv(input);
-    BlockCopy(output, input);
+    memcpy(output, input, KEYLEN);
     state = (state_t*)output;
     Cipher();
     Iv = output;
@@ -543,8 +533,8 @@ void AES_CBC_encrypt_buffer(uint8_t* output, uint8_t* input, uint32_t length, co
 
   if(remainders)
   {
-    BlockCopy(output, input);
-    memset(output + remainders, 0, KEYLEN - remainders); /* add 0-padding */
+    memcpy(output, input, remainders);
+    //memset(output + remainders, 0, KEYLEN - remainders); /* add 0-padding */
     state = (state_t*)output;
     Cipher();
   }
@@ -555,7 +545,7 @@ void AES_CBC_decrypt_buffer(uint8_t* output, uint8_t* input, uint32_t length, co
   uintptr_t i;
   uint8_t remainders = length % KEYLEN; /* Remaining bytes in the last non-full block */
   
-  BlockCopy(output, input);
+  memcpy(output, input, KEYLEN);
   state = (state_t*)output;
 
   // Skip the key expansion if key is passed as 0
@@ -573,7 +563,7 @@ void AES_CBC_decrypt_buffer(uint8_t* output, uint8_t* input, uint32_t length, co
 
   for(i = 0; i < length; i += KEYLEN)
   {
-    BlockCopy(output, input);
+    memcpy(output, input, KEYLEN);
     state = (state_t*)output;
     InvCipher();
     XorWithIv(output);
@@ -584,7 +574,7 @@ void AES_CBC_decrypt_buffer(uint8_t* output, uint8_t* input, uint32_t length, co
 
   if(remainders)
   {
-    BlockCopy(output, input);
+    memcpy(output, input, KEYLEN);
     memset(output+remainders, 0, KEYLEN - remainders); /* add 0-padding */
     state = (state_t*)output;
     InvCipher();
-- 
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