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* chacha-main: CHACHA: Makefile: build and run chacha tests from main.cc CHACHA: main.cc: move main() and benchmark logic here CHACHA: chacha.cc: remove main() Signed-off-by: Tim Janik <[email protected]>
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| Original file line number | Diff line number | Diff line change |
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| // Licensed CC0 Public Domain | ||
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| #include <chrono> // std::chrono | ||
| #include <sys/random.h> | ||
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| #include "chacha.cc" | ||
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| /// Return the current time as uint64 in nanoseconds. | ||
| extern inline uint64_t timestamp_nsecs() { return std::chrono::steady_clock::now().time_since_epoch().count(); } | ||
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| static uint64_t | ||
| generate_bytes (uint64_t nonce, const std::array<uint8_t, 32> &key, const uint64_t nbytes, const unsigned rounds, unsigned kind, FILE *fout) | ||
| { | ||
| const unsigned N = std::min (nbytes, 64 * 1024 * 1024ul); | ||
| std::vector<uint8_t> buffer (N, 0); | ||
| std::array<uint32_t, 16> state; | ||
| ChaCha::key_setup (state, 256, key, nonce); | ||
| size_t total; | ||
| for (total = 0; total < nbytes; /**/) { | ||
| uint8_t *start = buffer.data(), *last = start + N - 64 * ChaCha::avx_blocks; | ||
| while (start < last) | ||
| start += ChaCha::generate_blocks (state, N, nullptr, start, rounds, kind); | ||
| if (fout) | ||
| fwrite (buffer.data(), start - buffer.data(), 1, fout); | ||
| total += start - buffer.data(); | ||
| } | ||
| return total; | ||
| } | ||
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| int | ||
| main (int argc, const char *argv[]) | ||
| { | ||
| // ChaCha8 should be fine for CSPRNG purposes: https://github.com/rust-random/rand/issues/932 | ||
| std::array<uint8_t, 32> key{}; | ||
| auto const dummy1 [[maybe_unused]] = getrandom (key.data(), key.size(), GRND_NONBLOCK); | ||
| uint64_t nonce = timestamp_nsecs(); | ||
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| double streamlen = 0; | ||
| unsigned kind = ~0; // ALU | ||
| for (int i = 1; i < argc; i++) | ||
| if (0 == strcasecmp (argv[i], "--check")) { | ||
| chacha_tests(); | ||
| chacha_stream_tests (nonce, key); | ||
| return 0; | ||
| } else if (0 == strcasecmp (argv[i], "--sse")) | ||
| kind = 2; // SSE | ||
| else if (0 == strcasecmp (argv[i], "--alu")) | ||
| kind = 1; // ALU | ||
| else if (0 == strcasecmp (argv[i], "--avx")) | ||
| kind = 4; // AVX2 | ||
| else if (0 == strcasecmp (argv[i], "--seed") && i+1 < argc) { | ||
| nonce = strtoull (argv[++i], nullptr, 0); | ||
| key = std::array<uint8_t, 32>{}; | ||
| } else if (0 == strcmp (argv[i], "--bench")) { | ||
| const char *arg = i+1 < argc ? argv[++i] : "1G"; | ||
| char *u = nullptr; | ||
| streamlen = strtoull (arg, &u, 0); | ||
| if (u && u[0]) | ||
| switch (u[0]) | ||
| { | ||
| case 'K': streamlen *= 1024; break; | ||
| case 'M': streamlen *= 1024 * 1024; break; | ||
| case 'G': streamlen *= 1024 * 1024 * 1024; break; | ||
| case 'T': streamlen *= 1024 * 1024 * 1024 * 1024ull; break; | ||
| } | ||
| } | ||
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| if (streamlen > 0) { | ||
| streamlen = std::min (streamlen, 0x1p+63); // 2^63 = 9223372036854775808 | ||
| dprintf (2, "BENCH: %zu Bytes\n", size_t (streamlen)); | ||
| auto t1 = timestamp_nsecs(); | ||
| const size_t total = generate_bytes (nonce, key, uint64_t (streamlen), 8, kind, nullptr); | ||
| auto t2 = timestamp_nsecs(); | ||
| dprintf (2, " %.3f msecs (%zu Bytes), %f GB/sec\n", (t2 - t1) / 1000000.0, total, total * (1000000000.0 / (1024*1024*1024)) / (t2 - t1)); | ||
| } | ||
| else | ||
| generate_bytes (nonce, key, ~uint64_t (0), 8, kind, stdout); | ||
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| return 0; | ||
| } | ||
| // clang++ -std=gnu++17 -Wall -march=native -O3 main.cc -o chacha && ./chacha | dieharder -a -g 200 |