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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
     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)









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Created 1996-2024 by Maxim Chirkov

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