TRNG DA14531 | Dialog Semiconductor customer support - 雷电竞下载app,雷电竞官网登录,雷竞技安卓下载

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Tue, 2020-06-23 15:41

Firefox2005

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TRNG DA14531

Hi,

how to call thetrng_acquirefunction right?

I do not know where I get the address foruint8_t *sram_puf.

Isn't there any demo application or reference implementation?

/** **************************************************************************************** * @brief Acquires 128 random bits using uninitialized RAM data. * * @param[out] trng_bits_ptr Pointer to the buffer where random data will be stored. * @note Its address must be aligned to 32 bits. * @param[in] sram_puf Pointer to the base address of the uninitialized SRAM area. * @note Its address must be aligned to 32 bits. * @param[in] sram_puf_blocks Number of 16byte blocks to use (28 minimum). * @return Status code **************************************************************************************** */ uint8_t trng_acquire(uint8_t *trng_bits_ptr, uint8_t *sram_puf, const uint16_t sram_puf_blocks);

Keywords:

TRNG随机数

Device:

DA14531

Tue, 2020-06-23 16:50

PM_Dialog

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Hi Firefox2005

Please check init_rand_seed_from_trng() that invokes the trng_acquire(). There isn’t any example for this, but why don’t you use the init_rand_seed_from_trng() in order to initialize random number generator seed using random bits acquired from TRNG? The purpose of the trng_aquire() is to seed the random function.

Thanks, PM_Dialog

Wed, 2020-06-24 05:56

Firefox2005

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Hi,

so I missunderstood the function...

In that case I just have toinit_rand_seed_from_trng ();和使用the generated random value to initialize e.g. thesrand(trng_state_val);function and poll some random numbers fromrand();

But I do get always the same random number over and over again if I restart the same firmware build. I do not think this is correct.

When do I have to reinitialize theinit_rand_seed_from_trng ();一遍吗?

Why is thetrng_aquire(...)function than not static if I do not have to use it outside the trng.c?

Thank you so far

Wed, 2020-06-24 17:19

PM_Dialog

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Hi There,

What is the same random number that you are getting? Coudl you please share the results?

Thanks, PM_Dialog

Thu, 2020-06-25 10:21

(Reply to #4) #5

Firefox2005

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I always get the same output

I always get the same output if I reload and start the firmware. This should not be in my opinion.

Code:

void user_app_init(void) { arch_printf("\r\n\r\nuser_app_init\r\n"); // Initialize random number generator seed using random bits acquired from TRNG init_rand_seed_from_trng(); //Initialise standard c rand() function with trng random number srand(trng_state_val); // Test: Loop through the random number generator to test the random numbers generator... for(uint8_t i=0; i<10; i++){ //Get 16byte random numbers for AES-128 key for(uint8_t i=0; i


                    
                    Console output:
                    user_app_init CHALLENGE d816f9d60c6c876abab0a74a11828fae CHALLENGE a832652ba76aa59c374db76d6cbcd48a CHALLENGE 2fd232c58303414c7a264221f0a8bc89 CHALLENGE a4e64f980420b48af8d631d962c4767e CHALLENGE b1740409a2f0c9b945cf4f9a8750e9ea CHALLENGE c694072749e4ce4764ce643001c7d134 CHALLENGE 756796e7a5a12e6129d5cae5a2d8d0df CHALLENGE 470e8f5c067b89b08aa309bf495c0c48 CHALLENGE 952486692eed4f8e7bace731b5cec0d4 CHALLENGE e3b460feaf935240c3918cd46146de34


            
            
             
              
               Fri, 2020-06-26 16:32
              #6
             
             
              
               
                
                 
                  
                   PM_Dialog
                  
                  
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                Hi There,
               
                
                
                 
                  
                   Hi There,
                   Thanks for your inputs. Let me check the provided code snippet and I'll revert back to you shorlty.
                   Thanks, PM_Dialog
                  
                 
                
               
              
             
             
              
              
               
                
               
              
             
            
            
            
             
              
               Wed, 2020-07-01 14:44
              #7
             
             
              
               
                
                 
                  
                   PM_Dialog
                  
                  
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                Hi There,
               
                
                
                 
                  
                   Hi There,
                   My apologies for the confusion. If the CFG_TRNG macro is defined in the da1458x_config_advanced.h, then the init_rand_seed_from_trng() is automatically called by the SDK. Please check line 1324 in the arch_system.c file. This means that the SDK will initialize random number generator seed automatically. In case you want to generate random numbers, you should just use the rand() function.
                   Thanks, PM_Dialog