Remove aes.c in favor of mbedtls implementation.

Changelog

CHANGELOG.md

@@ -4,6 +4,7 @@ This project uses the changelog in accordance with [keepchangelog](http://keepac
 
 ## [unreleased][unreleased]
  - Add documentation for usage of Proxmark3 under WSL (@doegox)
+ - Change: replace aes.c with mbedtls version (@slurdge)
  - Change: replace ukbhit by kbd_enter_pressed, not requiring tcgetattr (@xianglin1998/@doegox)
  - Add config for RaspberryPi in JTAG tools (@doegox)
  - Add config for FTDI C232HM-DDHSL-0 in JTAG tools (@doegox)

armsrc/Makefile

@@ -30,7 +30,7 @@ SRC_ISO15693 = iso15693.c iso15693tools.c
 SRC_ISO14443a = iso14443a.c mifareutil.c mifarecmd.c epa.c mifaresim.c
 SRC_ISO14443b = iso14443b.c
 SRC_FELICA = felica.c
-SRC_CRAPTO1 = crypto1.c des.c aes.c desfire_key.c desfire_crypto.c mifaredesfire.c
+SRC_CRAPTO1 = crypto1.c des.c desfire_key.c desfire_crypto.c mifaredesfire.c aes.c platform_util.c
 SRC_CRC = crc.c crc16.c crc32.c
 SRC_ICLASS = iclass.c optimized_cipher.c
 SRC_LEGIC = legicrf.c legicrfsim.c legic_prng.c

armsrc/aes.h

@@ -1,34 +0,0 @@
-/*
-* AES Cryptographic Algorithm Header File. Include this header file in
-* your source which uses these given APIs. (This source is kept under
-* public domain)
-*/
-#ifndef __AES_H
-#define __AES_H
-
-// AES context structure
-typedef struct {
-    unsigned int Ek[60];
-    unsigned int Dk[60];
-    unsigned int Iv[4];
-    unsigned char Nr;
-    unsigned char Mode;
-} AesCtx;
-
-// key length in bytes
-#define KEY128 16
-#define KEY192 24
-#define KEY256 32
-// block size in bytes
-#define BLOCKSZ 16
-// mode
-#define EBC 0
-#define CBC 1
-
-// AES API function prototype
-
-int AesCtxIni(AesCtx *pCtx, unsigned char *pIV, unsigned char *pKey, unsigned int KeyLen, unsigned char Mode);
-int AesEncrypt(AesCtx *pCtx, unsigned char *pData, unsigned char *pCipher, unsigned int DataLen);
-int AesDecrypt(AesCtx *pCtx, unsigned char *pCipher, unsigned char *pData, unsigned int CipherLen);
-
-#endif

armsrc/desfire_crypto.c

@@ -571,15 +571,19 @@ void mifare_cypher_single_block(desfirekey_t key, uint8_t *data, uint8_t *ivect,
         case T_AES:
             switch (operation) {
                 case MCO_ENCYPHER: {
-                    AesCtx ctx;
+                    mbedtls_aes_context ctx;
-                    AesCtxIni(&ctx, ivect, key->data, KEY128, CBC);
+                    mbedtls_aes_init(&ctx);
-                    AesEncrypt(&ctx, data, edata, sizeof(edata));
+                    mbedtls_aes_setkey_enc(&ctx, key->data, 128);
+                    mbedtls_aes_crypt_cbc(&ctx, MBEDTLS_AES_ENCRYPT, sizeof(edata), ivect, data, edata);
+                    mbedtls_aes_free(&ctx);
                     break;
                 }
                 case MCO_DECYPHER: {
-                    AesCtx ctx;
+                    mbedtls_aes_context ctx;
-                    AesCtxIni(&ctx, ivect, key->data, KEY128, CBC);
+                    mbedtls_aes_init(&ctx);
-                    AesDecrypt(&ctx, edata, data, sizeof(edata));
+                    mbedtls_aes_setkey_dec(&ctx, key->data, 128);
+                    mbedtls_aes_crypt_cbc(&ctx, MBEDTLS_AES_DECRYPT, sizeof(edata), ivect, edata, data);
+                    mbedtls_aes_free(&ctx);
                     break;
                 }
             }

armsrc/mifaredesfire.c

@@ -433,15 +433,9 @@ void MifareDES_Auth1(uint8_t arg0, uint8_t arg1, uint8_t arg2,  uint8_t *datain)
             desfirekey_t key = &defaultkey;
             Desfire_aes_key_new(keybytes, key);
 
-            AesCtx ctx;
+            mbedtls_aes_context ctx;
             uint8_t IV[16] = {0x00};
-            if (AesCtxIni(&ctx, IV, key->data, KEY128, CBC) < 0) {
+            mbedtls_aes_init(&ctx);
-                if (DBGLEVEL >= 4) {
-                    DbpString("AES context failed to init");
-                }
-                OnError(7);
-                return;
-            }
 
             cmd[0] = AUTHENTICATE_AES;
             cmd[1] = 0x00;  //keynumber
@@ -457,13 +451,27 @@ void MifareDES_Auth1(uint8_t arg0, uint8_t arg1, uint8_t arg2,  uint8_t *datain)
             memcpy(encRndB, resp + 3, 16);
 
             // dekryptera tagnonce.
-            AesDecrypt(&ctx, encRndB, decRndB, 16);
+            if (mbedtls_aes_setkey_dec(&ctx, key->data, 128) != 0) {
+                if (DBGLEVEL >= 4) {
+                    DbpString("mbedtls_aes_setkey_dec failed");
+                }
+                OnError(7);
+                return;
+            }
+            mbedtls_aes_crypt_cbc(&ctx, MBEDTLS_AES_DECRYPT, 16, IV, encRndB, decRndB);
             rol(decRndB, 16);
             uint8_t nonce[16] = {0x00};
             memcpy(both, nonce, 16);
             memcpy(both + 16, decRndB, 16);
             uint8_t encBoth[32] = {0x00};
-            AesEncrypt(&ctx, both, encBoth, 32);
+            if (mbedtls_aes_setkey_enc(&ctx, key->data, 128) != 0) {
+                if (DBGLEVEL >= 4) {
+                    DbpString("mbedtls_aes_setkey_enc failed");
+                }
+                OnError(7);
+                return;
+            }
+            mbedtls_aes_crypt_cbc(&ctx, MBEDTLS_AES_ENCRYPT, 32, IV, both, encBoth);
 
             cmd[0] = ADDITIONAL_FRAME;
             memcpy(cmd + 1, encBoth, 32);

common/Makefile.common

@@ -63,7 +63,7 @@ DETECTED_OS=Windows
 endif
 
 # Also search prerequisites in the common directory (for usb.c), the fpga directory (for fpga.bit), and the zlib directory
-VPATH = . ../common ../common/crapto1 ../common/polarssl ../fpga ../zlib ../armsrc/Standalone ../uart
+VPATH = . ../common ../common/crapto1 ../common/mbedtls ../fpga ../zlib ../armsrc/Standalone ../uart
 
 INCLUDES = ../include/proxmark3.h ../include/at91sam7s512.h ../include/config_gpio.h ../include/pm3_cmd.h $(APP_INCLUDES)
 

common/desfire.h

@@ -3,7 +3,7 @@
 
 #include <string.h>
 #include <stdarg.h>
-#include "aes.h"
+#include "mbedtls/aes.h"
 #include "mifare.h"
 
 #define MAX_CRYPTO_BLOCK_SIZE 16
@@ -71,10 +71,6 @@ enum DESFIRE_CRYPTOALGO {
 struct desfire_key {
     enum DESFIRE_CRYPTOALGO type;
     uint8_t data[24];
-    // DES_key_schedule ks1;
-    // DES_key_schedule ks2;
-    // DES_key_schedule ks3;
-    AesCtx aes_ks;
     uint8_t cmac_sk1[24];
     uint8_t cmac_sk2[24];
     uint8_t aes_version;

common/mbedtls/platform_util.c

@@ -60,9 +60,9 @@
  * mbedtls_platform_zeroize() to use a suitable implementation for their
  * platform and needs.
  */
-static void *(* const volatile memset_func)(void *, int, size_t) = memset;
+//static void *(* const volatile memset_func)(void *, int, size_t) = memset;
 
 void mbedtls_platform_zeroize(void *buf, size_t len) {
-    memset_func(buf, 0, len);
+    memset(buf, 0, len);
 }
 #endif /* MBEDTLS_PLATFORM_ZEROIZE_ALT */