1 Topic by yvelumani

(2 replies, posted in wolfSSL)

I'm using the function wolfSSL_RAND_bytes to create an Random WiFi password. But on some instance I get the same password. Below is my code snippet. 

#include <wolfssl/ssl.h>
bool GetRandomCharacters(char* buffer, int count){
   unsigned char* t_buffer = (unsigned char*)buffer;

    char convert[] = "ABCEFGHQJKLMNOPQRSTUVWXYZabcdefghijkmnopqrstuvwxyz923456"
                     "789ABCEFGHQJKLMNOPQRSTUVWXYZabcdefghijkmnopqrstuvwxyz923456789ABCE"
                     "FGHQJKLMNOPQRSTUVWXYZabcdefghijkmnopqrstuvwxyz923456789ABCEFGHQJKL"
                     "MNOPQRSTUVWXYZabcdefghijkmnopqrstuvwxyz923456789ABCEFGHHJKLMNOPQRSTU";

    assert(257 == sizeof(convert));

    if (getRandomBytes(t_buffer, count)) {
        for (int i = 0; i < count; ++i) { buffer[i] = convert[t_buffer[i]]; }

        return true;
    }

    return false;
}

inline bool getRandomBytes(unsigned char* buffer, int count) {
    return SSL_SUCCESS == wolfSSL_RAND_bytes(buffer, count);
}

So I need to understand the algorithm used in wolfSSL_RAND_bytes function. From the open source github code, I came to know that there are two different implementations inside function 

wc_InitRng() and wc_RNG_GenerateBlock().

I appreciate your help.

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