OpenSSLaddallalgorithms(3) OpenSSL OpenSSLaddallalgorithms(3)

NAME
       OpenSSLaddallalgorithms, OpenSSLaddallciphers,
       OpenSSLaddalldigests - add algorithms to internal table

SYNOPSIS
        #include 

        void OpenSSLaddallalgorithms(void);
        void OpenSSLaddallciphers(void);
        void OpenSSLaddalldigests(void);

        void EVPcleanup(void);

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

       OpenSSLaddalldigests() adds all digest algorithms to the table.

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

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

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

RETURN VALUES
       None of the functions return a value.

NNOOTTEESS
       A typical application will call OpenSSLaddallalgorithms() initially
       and EVPcleanup() before exiting.

       An application does not need to add algorithms to use them explicitly,
       for example by EVPsha1(). 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 OpenSSLaddallalgorithms() 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), EVPDigestInit(3), EVPEncryptInit(3)



0.9.7l                            2003-12-27     OpenSSLaddallalgorithms(3)