OpenSSL_add_all_algorithms(3)

     OpenSSL_add_all_algorit0.9.6h (2000-OpenSSL_add_all_algorithms(3)

     NAME
          OpenSSL_add_all_algorithms, OpenSSL_add_all_ciphers,
          OpenSSL_add_all_digests - add algorithms to internal table

     SYNOPSIS
           #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);

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

          OpenSSL_add_all_digests() adds all digest algorithms to the
          table.

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

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

          EVP_cleanup() removes all ciphers and digests from the
          table.

     RETURN VALUES
          None of the functions return a value.

     NOTES
          A typical application will will call
          OpenSSL_add_all_algorithms() initially and EVP_cleanup()
          before exiting.

          An application does not need to add algorithms to use them
          explicitly, for example by EVP_sha1(). It just 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 misbehave 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 OpenSSL_add_all_algorithms() links in all
          algorithms: as a result a statically linked executable can

     Page 1                                         (printed 1/19/103)

     OpenSSL_add_all_algorit0.9.6h (2000-OpenSSL_add_all_algorithms(3)

          be quite large. If this is important it is possible to just
          add the required ciphers and digests.

     BUGS
          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 this is not too
          much of a problem in practice.

     SEE ALSO
          evp(3), EVP_DigestInit(3), EVP_EncryptInit(3)

     Page 2                                         (printed 1/19/103)