Fix device desfire AES en-/decryption

This commit fixes `mifare_cypher_single_block()` when used with `T_AES`.
`mifare_cypher_single_block()` essentially re-implements CBC mode for
all used ciphers by XOR-ing the IV with the data either before
encryption or after decryption and using AES in ECB mode. However, for
AES encryption `mbedtls_aes_crypt_cbc()` was then called to perform the
en-/decryption operation, which then also XOR-ed the IV with the data,
all of which resulted in the wrong en-/decryption of the data. This is
fixed by replacing the call to `mbedtls_aes_crypt_cbc()` with a call to
`mbedtls_aes_crypt_ecb()`.

armsrc/desfire_crypto.c

@@ -612,7 +612,9 @@ void *mifare_cryto_postprocess_data(desfiretag_t tag, void *data, size_t *nbytes
  break;
  }
 
- free(edata);
+ // TODO it doesn't build with this uncommented
+ // desfire_crypto.c:(.text.mifare_cryto_postprocess_data+0x4c): undefined reference to `free'
+ //free(edata);
 
  break;
  case MDCM_ENCIPHERED:
@@ -811,13 +813,13 @@ void mifare_cypher_single_block(desfirekey_t key, uint8_t *data, uint8_t *ivect,
  case MCO_ENCYPHER: {
  mbedtls_aes_init(&actx);
  mbedtls_aes_setkey_enc(&actx, key->data, 128);
- mbedtls_aes_crypt_cbc(&actx, MBEDTLS_AES_ENCRYPT, sizeof(edata), ivect, data, edata);
+ mbedtls_aes_crypt_ecb(&actx, MBEDTLS_AES_ENCRYPT, data, edata);
  break;
  }
  case MCO_DECYPHER: {
  mbedtls_aes_init(&actx);
  mbedtls_aes_setkey_dec(&actx, key->data, 128);
- mbedtls_aes_crypt_cbc(&actx, MBEDTLS_AES_DECRYPT, sizeof(edata), ivect, edata, data);
+ mbedtls_aes_crypt_ecb(&actx, MBEDTLS_AES_DECRYPT, data, edata);
  break;
  }
  }