ECC example in CRYP-LIB with STM32 F407

[naruhodoh2006]

Posted on July 02, 2014 at 08:54

Hello,

I have tried ECC_KeyGeneration_SignatureVerification example in STM32-CRYP-LIB with STM32 F407 (toolchain is IAR) But, when ''Generate ECC key pair'' be executed, the status be changed to FAILED (value:6002 RNG_ERR_BAD_OPERATION). Does anyone can execute this example with STM32 F470? How can I fix it? Thank you Naruhodo #crypto #ecc.h #stm32f4 #discovery

[Tesla DeLorean]

Posted on July 02, 2014 at 13:20

Evidently it uses the RNG (Random Number Generator) hardware, which is not functioning. Check that it's enabled, clocked, and that you are using the PLL to clock the part as the RNG/SDIO are dependent on a ~48 MHz on the Q Tap

STM32F4xx_DSP_StdPeriph_Lib_V1.3.0\Project\STM32F4xx_StdPeriph_Examples\RNG\RNG_MultiRNG

static void RNG_Config(void)
{
/* Enable RNG clock source */
RCC_AHB2PeriphClockCmd(RCC_AHB2Periph_RNG, ENABLE);
/* RNG Peripheral enable */
RNG_Cmd(ENABLE);
}

[adnan2]

Posted on July 21, 2014 at 14:06Hi,I am using ECCscalarMUL function and there is no error but i am unable to verify my test vectors. I am using the sample code giving in the lib for 160 bit curve.Please Help.Best Regards,Ibrahim

[Tesla DeLorean]

Posted on July 21, 2014 at 17:36

I am using ECCscalarMUL function and there is no error but i am unable to verify my test vectors. I am using the sample code giving in the lib for 160 bit curve.

Not sure how I'm going to be able to independently verify that, but ...

[adnan2]

Posted on July 23, 2014 at 00:50

Thanks for the reply.

I have used the portion of code in ecc.h that is used to compute scalar multiplication for 160 bits.

This code is executing without errors but the answers I am expecting after the scalar multiplication is not correct according to NIST test vectors.

Input Values are(Already in the code):

ecc_160_a[]={0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0x7F,0xFF,0xFF,0xFC};

ecc_160_b[]={0x1C,0x97,0xBE,0xFC,0x54,0xBD,0x7A,0x8B,0x65,0xAC,0xF8,0x9F,0x81,0xD4,0xD4,0xAD,0xC5,0x65,0xFA,0x45};

ecc_160_p[]={0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0x7F,0xFF,0xFF,0xFF};

ecc_160_n[]={0x01,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x01,0xF4,0xC8,0xF9,0x27,0xAE,0xD3,0xCA,0x75,0x22,0x57};

ecc_160_xG[]={0x4A,0x96,0xB5,0x68,0x8E,0xF5,0x73,0x28,0x46,0x64,0x69,0x89,0x68,0xC3,0x8B,0xB9,0x13,0xCB,0xFC,0x82};

ecc_160_yG[]={0x23,0xA6,0x28,0x55,0x31,0x68,0x94,0x7D,0x59,0xDC,0xC9,0x12,0x04,0x23,0x51,0x37,0x7A,0xC5,0xFB,0x32};

ecc_160_privkey[]={0xAA,0x37,0x4F,0xFC,0x3C,0xE1,0x44,0xE6,0xB0,0x73,0x30,0x79,0x72,0xCB,0x6D,0x57,0xB2,0xA4,0xE9,0x82};

Answer Should be:

X-Coordinate (decimal) =

466448783855397898016055842232266600516272889280

Y-Coordinate (decimal)=

1110706324081757720403272427311003102474457754220

Hex of X-Coordinate = 51B4496FECC406ED0E75A24A3C03206251419DC0

But is am getting wrong answers.

L

For X coordinate I am getting some value but for Y-Coordinate its all zeros except 0x55 and 0xAB in two bytes.

Also the returned size of X and Y coordinates is half of the original that is 10 bytes instead of 20 bytes

ecc.h file is attached.

Please Help.

Best Regards,

Ibrahim

________________ Attachments : ecc.h : https://st--c.eu10.content.force.com/sfc/dist/version/download/?oid=00Db0000000YtG6&ids=0680X000006I1BN&d=%2Fa%2F0X0000000bkP%2Fodq5r23qUzwb03VksLmiuPzpZ0STNt4qKicJNU0mkl8&asPdf=false

[Tesla DeLorean]

Posted on July 23, 2014 at 04:13

Are you sure you have an adequate stack allocation?

[Tesla DeLorean]

Posted on July 23, 2014 at 06:26

Success? Xsize 20, Ysize 20
X : 51B4496FECC406ED0E75A24A3C03206251419DC0
Y : C28DCB4B73A514B468D793894F381CCC1756AA6C

[Tesla DeLorean]

Posted on July 24, 2014 at 04:16

You need to initialize the ST Library

...
membuf_stt mb;
uint8_t preallocated_buffer[4096];
/* DeInitialize STM32 Cryptographic Library */
Crypto_DeInit();
//Set up the membuf_stt structure to a preallocated (on stack) buffer of 4kB
mb.mSize = sizeof(preallocated_buffer);
mb.mUsed = 0;
mb.pmBuf = preallocated_buffer;
...