crypto/openssl/doc/ssl/SSL_library_init.pod

   1 =pod
   2
   3 =head1 NAME
   4
   5 SSL_library_init, OpenSSL_add_ssl_algorithms, SSLeay_add_ssl_algorithms
   6 - initialize SSL library by registering algorithms
   7
   8 =head1 SYNOPSIS
   9
  10  #include <openssl/ssl.h>
  11
  12  int SSL_library_init(void);
  13  #define OpenSSL_add_ssl_algorithms()    SSL_library_init()
  14  #define SSLeay_add_ssl_algorithms()     SSL_library_init()
  15
  16 =head1 DESCRIPTION
  17
  18 SSL_library_init() registers the available ciphers and digests.
  19
  20 OpenSSL_add_ssl_algorithms() and SSLeay_add_ssl_algorithms() are synonyms
  21 for SSL_library_init().
  22
  23 =head1 NOTES
  24
  25 SSL_library_init() must be called before any other action takes place.
  26
  27 =head1 WARNING
  28
  29 SSL_library_init() only registers ciphers. Another important initialization
  30 is the seeding of the PRNG (Pseudo Random Number Generator), which has to
  31 be performed separately.
  32
  33 =head1 EXAMPLES
  34
  35 A typical TLS/SSL application will start with the library initialization,
  36 will provide readable error messages and will seed the PRNG.
  37
  38  SSL_load_error_strings();                /* readable error messages */
  39  SSL_library_init();                      /* initialize library */
  40  actions_to_seed_PRNG();
  41
  42 =head1 RETURN VALUES
  43
  44 SSL_library_init() always returns "1", so it is safe to discard the return
  45 value.
  46
  47 =head1 SEE ALSO
  48
  49 L<ssl(3)|ssl(3)>, L<SSL_load_error_strings(3)|SSL_load_error_strings(3)>,
  50 L<RAND_add(3)|RAND_add(3)>
  51
  52 =cut