OpenSSL_add_all_digests man page on DigitalUNIX

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OpenSSL_add_all_algorithms(3)			 OpenSSL_add_all_algorithms(3)

       OpenSSL_add_all_algorithms,		      OpenSSL_add_all_ciphers,
       OpenSSL_add_all_digests - Add algorithms to internal table

       #include <openssl/evp.h>

       void OpenSSL_add_all_algorithms(
	       void ); void OpenSSL_add_all_ciphers(
	       void ); void OpenSSL_add_all_digests(
	       void ); void EVP_cleanup(
	       void );

       OpenSSL keeps an internal table of digest algorithms  and  ciphers.  It
       uses   this   table   to	  lookup   ciphers   via   functions  such  as

       The OpenSSL_add_all_digests() function adds all	digest	algorithms  to
       the table.

       The  OpenSSL_add_all_algorithms()  function  adds all algorithms to the
       table (digests and ciphers).

       The OpenSSL_add_all_ciphers() function adds all	encryption  algorithms
       to the table including password based encryption algorithms.

       The EVP_cleanup() function removes all ciphers and digests from the ta‐

       A typical application will call the OpenSSL_add_all_algorithms()	 func‐
       tion initially and the EVP_cleanup() function before exiting.

       An  application does not need to add algorithms to use them explicitly,
       for example by EVP_sha1(). It needs to add them if it (or  any  of  the
       functions it calls) needs to lookup algorithms.

       The  cipher  and	 digest lookup functions are used in many parts of the
       library. If the table is not initialized	 several  functions  will  not
       work  correctly and complain they cannot find algorithms. This includes
       the PEM, PKCS#12, SSL and S/MIME libraries. This is a common  query  in
       the OpenSSL mailing lists.

       Calling the OpenSSL_add_all_algorithms() function links all algorithms.
       As a result, a statically linked executable can be quite large. If this
       is  important,  it  is  possible	 to  add only the required ciphers and

       Although the functions do not return error codes	 it  is	 possible  for
       them  to fail. This will only happen as a result of a memory allocation
       failure, so it is not much of a problem in practice.

       None of the functions return a value.

       Functions: evp(3), EVP_DigestInit(3), EVP_EncryptInit(3)


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