Remco Bloemen / Mbed 2 deprecated EntropySource

Use your mbed and it\'s noisy analog inputs as a hardware random number generator!

Dependencies:   mbed SHA256

main.cpp@0:dda0a8c4ac0c, 2011-06-20 (annotated)

Committer:
Remco
Date:
Mon Jun 20 13:23:03 2011 +0000
Revision:
0:dda0a8c4ac0c

        

        
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#include "mbed.h"





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#include "EntropyPool.h"





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#include "PowerControl.h"





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#include "EthernetPowerControl.h"





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DigitalOut led1(LED1);





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DigitalOut led2(LED2);





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DigitalOut led3(LED3);





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DigitalOut led4(LED4);





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Serial pc(USBTX, USBRX);





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EntropyPool pool;





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AnalogIn noise1(p15);





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AnalogIn noise2(p16);





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AnalogIn noise3(p17);





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AnalogIn noise4(p18);





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AnalogIn noise5(p19);





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AnalogIn noise6(p20);





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void gatherEntropy()





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{





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    pool.gatherAnalogNoise(noise1);





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    pool.gatherAnalogNoise(noise2);





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    pool.gatherAnalogNoise(noise3);





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    pool.gatherAnalogNoise(noise4);





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    pool.gatherAnalogNoise(noise5);





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    pool.gatherAnalogNoise(noise6);





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}





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void write_block()





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{





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    led1 = 0; led2 = 1;





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    while(pc.readable()) pc.getc();





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    led2 = 0; led3 = 1;





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    char* random = pool.produce(1024);





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    led3 = 0; led4 = 1;





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    for(int i = 0; i < 1024; ++i)





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        pc.putc(random[i]);





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    delete random;





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    led4 = 0; led1 = 1;





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}





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int main() {





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    pool.gatherer.attach(&gatherEntropy);





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    // Disable ethernet to save power





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    PHY_PowerDown();





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    // Write at maximum warp





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    pc.baud(115200);





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    pc.attach(&write_block, Serial::RxIrq);





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    // Sleep untill called





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    while(1) Sleep();





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}