Is openssl crypto library thread-safe?

[deiva shanmugam]

Hi,

We are planning to make use of openssl crypto library in multithreaded
environment.

We call OpenSSL_add_all_algorithms() before creating threads and will create
BIO, EVP_KEY, SHA256 , SHA1 and RSA object in each thread and makes use of
the following functions:

SHA1_Init                 BIO_new_mem_buf        EVP_PKEY_get1
RSA_size
SHA1_Final             BIO_free                             EVP_PKEY_free
     RSA_PKCS1_PADDING
SHA1_Update         BIO_write                           EVP_cleanup
      RSA_free
SHA256_Init            BIO_flush
                                          RSA_verify
SHA256_Final        BIO_new
SHA256_Update    BIO_s_mem

We found in the openssl website that  "OpenSSL can safely be used in
multi-threaded applications provided that at least two callback functions
are set, locking_function and threadid_func." And from FAQ, its stated that
"Openssl is thread safe with limitations [ SSL connections may not be used
concurrently in many threads]" .

So, can someone let us know that the functions mentioned above are MT safe
without implementing the two callback functions.

Thanks in advance,
Deiva Shanmugam