SERVER-43641 upgrade random.h

This reverts commit a40b196bd3cecd0b66a6323f57e6f08efe0af392.

1 files changed, 3 insertions, 9 deletions

diff --git a/src/mongo/db/time_proof_service.cpp b/src/mongo/db/time_proof_service.cpp
index 7e29f0b2254..da65e441712 100644
--- a/src/mongo/db/time_proof_service.cpp
+++ b/src/mongo/db/time_proof_service.cpp
@@ -45,15 +45,9 @@ namespace mongo {
 const uint64_t kRangeMask = 0x0000'0000'0000'FFFF;
 
 TimeProofService::Key TimeProofService::generateRandomKey() {
-    // SecureRandom only produces 64-bit numbers, so 3 is the minimum for 20 random bytes.
-    const size_t kRandomNumbers = 3;
-    std::array<std::int64_t, kRandomNumbers> keyBuffer;
-    std::unique_ptr<SecureRandom> rng(SecureRandom::create());
-    std::generate(keyBuffer.begin(), keyBuffer.end(), [&] { return rng->nextInt64(); });
-
-    return fassert(40384,
-                   SHA1Block::fromBuffer(reinterpret_cast<std::uint8_t*>(keyBuffer.data()),
-                                         SHA1Block::kHashLength));
+    std::array<std::uint8_t, SHA1Block::kHashLength> keyBuffer;
+    SecureRandom().fill(keyBuffer.data(), keyBuffer.size());
+    return fassert(40384, SHA1Block::fromBuffer(keyBuffer.data(), keyBuffer.size()));
 }
 
 TimeProofService::TimeProof TimeProofService::getProof(LogicalTime time, const Key& key) {