CRYP unit not working on ST32F407

[johannes2]

Posted on August 29, 2012 at 15:03

Hi forum,

I'm having trouble getting the CRYP unit working on a ST32F407. First I've tried manually (failed) and -- thinking that I did something wrong -- tried with the ST provided libraries (which also don't work). I'm doing something wrong, I'm very sure, but I can't figure out what. First off: Yes, I have the device properly enabled:

[code]

RCC_AHB2PeriphClockCmd(RCC_AHB2Periph_CRYP, ENABLE);

[/code]

then, I use this:

[code]

        CRYP_InitTypeDef x;

        memset(&x, 0, sizeof(x));

        x.CRYP_AlgoDir = CRYP_AlgoDir_Encrypt;

        x.CRYP_AlgoMode = CRYP_AlgoMode_AES_ECB;

        x.CRYP_DataType = CRYP_DataType_32b;

        x.CRYP_KeySize = CRYP_KeySize_128b;

        CRYP_Init(&x);

    }

    {

        CRYP_KeyInitTypeDef x;

        memset(&x, 0, sizeof(x));

        CRYP_KeyInit(&x);

    }

    CRYP_FIFOFlush();

    CRYP_Cmd(ENABLE);

    /* Write input data */

    for (int i = 0; i < 4; i++) {

         CRYP_DataIn(((uint32_t*)aSource)[i]);

    }

    printf(''Waiting...\r\n'');

    /* Wait until finished */

    while (!CRYP_GetFlagStatus(CRYP_FLAG_OFNE));

[/code]

(this never finishes, i.e. it's not yielding any data). Then I tried the ''high level'' function, which should do everything for me

[code]

printf(''Result: %d\r\n'', CRYP_AES_ECB(MODE_ENCRYPT, (unsigned char*)aKey, 128, (unsigned char*)aSource, 16, aDestination));

[/code]

...which fails with error 1.

Any ideas?

Best regards,

Joe

#stm32f407-cryp-aes128

[johannes2]

Posted on August 29, 2012 at 15:25

Ouch. This hurts.

The 407 doesn't have a CRYP unit. The 417 does.

Sorry for the post,

Best regards,

Joe

[Tesla DeLorean]

Posted on August 29, 2012 at 15:57

The 407 doesn't have a CRYP unit. The 417 does.

 

Yep, that's pretty much the problem. Avoids a lot of the ITAR/Export joy.

You should be able to look at the RCC clock enable bit, and determine it never gets set.

There are less 417 part choices, basically a 512KB and 1MB flash version, from a common die.

[johannes2]

Posted on August 29, 2012 at 18:13

Ah, I didn't check if the bit in RCC actually got set. What got me curious was that CRYP->CR->CRYPEN never got set.

However, I somehow would've expected a fault. Accesses to that memory area on the 407 don't trap, but don't execute either. Interesting to know. But thanks for the tip, will check RCC next time, too.

[rajesh]

Posted on August 23, 2013 at 11:16

Hi I am Testing CRYP on STM32f407VG RCC also configured but in CRYP Registers are not loading.

thanks ..

[Tesla DeLorean]

Posted on August 23, 2013 at 14:08

The 407 doesn't have a CRYP or HASH engine, so don't be surprised that it doesn't work. You will need a 417 part.