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Is it an internal PRNG? Is it fed from /dev/random or /dev/urandom? How secure is it? If I have a hardware (TRNG) plugged in feeding my /dev/random will this source of entropy get used by bitcoind?

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    Well OpenSSL handles most cryptography things in Bitcoin.
    – Jori
    Apr 19, 2014 at 17:06
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    In this particular case, it's the RAND_bytes call from OpenSSL.
    – Diego Basch
    Apr 19, 2014 at 21:46
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    @DiegoBasch: May I suggest you upgrade your comment to an answer, ideally with a link to the source?
    – user6049
    Apr 20, 2014 at 19:43

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As others mentioned Bitcoin core uses OpenSSL random sources.

This means that it uses any random source available, like:

  • the operation system, i.e. interrupts
  • random sources of the CPU or the chip set
  • dedicated hardware for entropy generation

So in order to make sure your hardware random generator works with Bitcoin you must make sure it works with OpenSSL.

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It uses RAND_bytes from OpenSSL. The relevant call is CKey::MakeNewKey.

getnewaddress is in rpcwallet.cpp. It tries to get a key from the pool, and if the pool is empty it allocates a new one which is populated using RAND_bytes.

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