RAND_cleanup - erase the PRNG state
#if OPENSSL_API_COMPAT < 0x10100000L
Prior to OpenSSL 1.1.0, RAND_cleanup() released all resources used by the
PRNG. As of version 1.1.0, it does nothing and should not be called, since no
explicit initialisation or de-initialisation is necessary. See
RAND_cleanup() returns no value.
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