We are using only the OpenSSL cryptographic functionality, the EVP and
HMAC functions, in a multi-threaded application. Do we need to do
anything to ensure thread safety ? The documentation mentions
CRYPTO_set_locking_callback() and CRYPTO_set_id_callback() but we are
not calling these functions nor have we put critical sections in our own
code before calling the cryptographic functions. We are experiencing
some crashes and attempting to track them down and thought our use of
OpenSSL may be faulty.

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