43 lines
1.1 KiB
C++
Executable file
43 lines
1.1 KiB
C++
Executable file
#include <boost/test/unit_test.hpp>
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#include <fc/crypto/rand.hpp>
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#include <cmath>
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static void check_randomness( const char* buffer, size_t len ) {
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if (len == 0) { return; }
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// count bit runs and 0's / 1's
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unsigned int zc = 0, oc = 0, rc = 0, last = 2;
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for (size_t k = len; k; k--) {
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char c = *buffer++;
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for (int i = 0; i < 8; i++) {
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unsigned int bit = c & 1;
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c >>= 1;
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if (bit) { oc++; } else { zc++; }
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if (bit != last) { rc++; last = bit; }
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}
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}
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BOOST_CHECK_EQUAL( 8*len, zc + oc );
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double E = 1 + (zc + oc) / 2.0;
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double variance = (E - 1) * (E - 2) / (oc + zc - 1);
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double sigma = sqrt(variance);
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BOOST_CHECK( rc < E + sigma );
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}
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BOOST_AUTO_TEST_SUITE(fc_crypto)
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BOOST_AUTO_TEST_CASE(rand_test)
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{
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char buffer[128];
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fc::rand_bytes( buffer, sizeof(buffer) );
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check_randomness( buffer, sizeof(buffer) );
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}
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BOOST_AUTO_TEST_CASE(pseudo_rand_test)
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{
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char buffer[10013];
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fc::rand_pseudo_bytes( buffer, sizeof(buffer) );
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check_randomness( buffer, sizeof(buffer) );
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}
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BOOST_AUTO_TEST_SUITE_END()
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