Linux/AM4378: AES encrypt issues

Part Number: AM4378

Tool/software: Linux

when i try to encrypt i get:

Program received signal SIGSEGV, Segmentation fault.
0xb6e850c4 in EVP_EncryptUpdate () from /opt/ti-processor-sdk-linux-am437x-evm-04.03.00.05/targetNFS/usr/lib/libcrypto.so.1.0.0



some background:

I am developing on an EVM board for the AM4378. I am new to linux and linux development. my dev machine is running ubuntu 16.04. the libraries i have linked in are "ssl" and "crypto". i am sure i forgot something

i found the code for AES as an example project in the SDK folder, so i took what we needed. when i left it at cbc cryptography everything seemed to be working fine, when i switched it to ebc (and nothing else) it crashed on me.

i found this website and it doesn't seem to show anything different in the way i am doing things:

https://github.com/rockyxshen/block_...er/aescipher.c



so am i missing something in the setup? something else entirely? there isn't a whole lot of documentation on how any of this works that i could find so i am a bit at a loss.

here is my code: (the key comes from somewhere else, 32 bytes)

EVP_CIPHER_CTX en, de;

void aes_init(void)
{
/****************Enabling use of a hardware engine******************/
    ENGINE *e;

    ENGINE_load_builtin_engines();
    if (!(e = ENGINE_by_id("cryptodev")))
        fprintf(stderr, "Error finding specified ENGINE\n");
    else if (!ENGINE_set_default(e, ENGINE_METHOD_ALL))
        fprintf(stderr, "Error using ENGINE\n");
    else
        fprintf(stderr, "Engine successfully enabled\n");
/*******************************************************************/



  EVP_CIPHER_CTX_init(&en);
  EVP_EncryptInit_ex(&en, EVP_aes_256_ecb(), e, AesKey, NULL);  //sets up cipher context e_ctx for encryption with aes_256_ecb cipher type
  EVP_CIPHER_CTX_init(&de);
  EVP_DecryptInit_ex(&de, EVP_aes_256_ecb(), e, AesKey, NULL);  //sets up cipher context d_ctx for decryption with aes_256_ecb cipher type

 /* Release the structural reference from ENGINE_by_id() */
 ENGINE_free(e);
}

/********************************************************************
*   AES encryption function
*********************************************************************/
int aes_encrypt(unsigned char *input, unsigned char *output, unsigned int len)
{
  int c_len = 0;
  int ret_len = 0;
  int EncLen = 0;

  EVP_EncryptInit_ex(&en, NULL, NULL, NULL, NULL);

  //encryption works on factors of 16, if there are any stragglers we have to round up to a x16 value
  if((len & 0x0F) != 0)
  {
      EncLen = (len & 0xFFF0) + 0x10;
  }
  else
  {
      EncLen = len;
  }

  EVP_EncryptUpdate(&en, output, &c_len, input, EncLen);
  ret_len = c_len;

  return ret_len;
}


/********************************************************************
*   AES decryption function
*********************************************************************/
int aes_decrypt(unsigned char *input, unsigned char *output, unsigned int len)
{
  int c_len = 0;
  int ret_len = 0;

  EVP_DecryptInit_ex(&de, NULL, NULL, NULL, NULL);

  EVP_DecryptUpdate(&de, output, &c_len, input, len);
  ret_len = c_len;

  return ret_len;
}

/*********************************************************************
 *
 *********************************************************************/
void aes_close(void)
{
    EVP_CIPHER_CTX_cleanup(&en);
    EVP_CIPHER_CTX_cleanup(&de);
}

does anyone know if i need the additional "init" function calls before update and if i need the "final" function calls? i can't quite figure out what they do. the plan for this stuff is to constantly be encrypting and decrypting data on an open connection so it isn't planned to be a "one and done" deal.

thank you for any help you can give me