Linux/AM4378: AES examples

i did find that shortly after i posted. it seems to be what i am looking for.

FYI i am using code composer in ubuntu 16.04

2 things about adding in the code and libraries:

1) now when i run my debug gdb session it doesn't automatically load to main. i get this output:

GNU gdb (Linaro GDB) 7.8-2014.09

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There is NO WARRANTY, to the extent permitted by law.  Type "show copying"

and "show warranty" for details.

This GDB was configured as "--host=x86_64-arago-linux --target=arm-linux-gnueabi".

Type "show configuration" for configuration details.

For bug reporting instructions, please see:

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0xb6fd79c0 in _start () from /opt/ti-processor-sdk-linux-am437x-evm-04.03.00.05/targetNFS/lib/ld-linux-armhf.so.3

Program received signal SIGILL, Illegal instruction.

Cannot access memory at address 0x0

0xb6eef9a8 in ?? () from /opt/ti-processor-sdk-linux-am437x-evm-04.03.00.05/targetNFS/usr/lib/libcrypto.so.1.0.0

and when i hit run THEN i hit my temporary breakpoint at main and then i run like i normall do

2) i am trying to interface with an existing system so i need to be in ecb mode, when i do i get a crash every time when i try to encrypt where as when i tried it with cbc it worked fine. here is my failure message:

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

here is my code:

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;
}

Linaro GCC toolchain 6.2.1 2016.11 hard-float comes with AM437x PSDK v4.03:

ti-processor-sdk-linux-am437x-evm-04.03.00.05/linux-devkit/sysroots/x86_64-arago-linux/usr/bin/arm-linux-gnueabihf-gcc-6.2.1

Or you can download it separate from PSDK from below location:

releases.linaro.org/.../gcc-linaro-6.2.1-2016.11-x86_64_arm-linux-gnueabihf.tar.xz

Refer also to below links for more info regarding cross compile applications with GCC ARM Linaro toolchain.

Regards,
Pavel

cobsonchael said:

2) i am trying to interface with an existing system so i need to be in ecb mode, when i do i get a crash every time when i try to encrypt where as when i tried it with cbc it worked fine. here is my failure message:

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

From what I can find, only AES CBC mode is implemented in PSDK/example-applications/ti-crypto-examples-git/AES/

You should modify that application to add ECB support also.

Can you provide what is your output of the below command?

root@am437x-evm:~# openssl help

See also below e2e thread regarding ECB testing from user space:

e2e.ti.com/.../2257403

Regards,
Pavel

Part Number: AM4378

Tool/software: Linux

so when i start the GDBServer and start my debug configuration in code composer i get this error before i even attempt to run any code:

Program received signal SIGILL, Illegal instruction.
Cannot access memory at address 0x0
0xb6f4b9a8 in ?? () from /opt/ti-processor-sdk-linux-am437x-evm-04.03.00.05/targetNFS/usr/lib/libcrypto.so.1.0.0

if i try to run from this point i will make it to the temporary breakpoint in main i expected to hit initially. from there i am able to run my program.

if i do not include crypto and ssl libraries it starts at main no problem. 

in the related thread Pavel Botev stated i should be using "Linaro GCC toolchain 6.2.1 2016.11 hard-float" which comes with the SDK 4.03.0.05, which i have installed. so it should be used, right?

did i miss something i needed to add when i added in the libraries?

cobsonchael said:

so when i start the GDBServer and start my debug configuration in code composer i get this error before i even attempt to run any code:

Program received signal SIGILL, Illegal instruction.
Cannot access memory at address 0x0
0xb6f4b9a8 in ?? () from /opt/ti-processor-sdk-linux-am437x-evm-04.03.00.05/targetNFS/usr/lib/libcrypto.so.1.0.0

This might be a SW bug if your application. Can you reproduce this issue with the example applications that are coming with PSDK package? See also below e2e thread:

Make sure also you are align with below instructions when using GDBServer:

cobsonchael said:

in the related thread Pavel Botev stated i should be using "Linaro GCC toolchain 6.2.1 2016.11 hard-float" which comes with the SDK 4.03.0.05, which i have installed. so it should be used, right?

From what I understand you are building your application from within CCStudio. Make sure for cross compiler path you have "<SDK INSTALL DIR>/linux-devkit/sysroot/x86_64-arago-linux/usr/bin" and for cross compiler prefix you have "arm-linux-gnueabihf-"

http://software-dl.ti.com/processor-sdk-linux/esd/docs/latest/linux/Foundational_Components.html#ccs-compiling

Regards,
Pavel

yes it does it for the AES example project as well. i don't see how it would be a software problem on my end when it happens before i even get to main.

my cross compiler is set to the right values

my project is in debug. i haven't built it in release yet