Let the TLSv1_method() etc. functions return a const SSL_METHOD
pointer and make the SSL_METHOD parameter in SSL_CTX_new,
SSL_CTX_set_ssl_version and SSL_set_ssl_method const.

doc/ssl/SSL_CTX_new.pod

diff --git a/doc/ssl/SSL_CTX_new.pod b/doc/ssl/SSL_CTX_new.pod
index 465220a..73e8c47 100644
--- a/doc/ssl/SSL_CTX_new.pod
+++ b/doc/ssl/SSL_CTX_new.pod
@@ -8,7 +8,7 @@
 
  #include <openssl/ssl.h>
 
- SSL_CTX *SSL_CTX_new(SSL_METHOD *method);
+ SSL_CTX *SSL_CTX_new(const SSL_METHOD *method);
 
 =head1 DESCRIPTION
 

doc/ssl/SSL_CTX_set_ssl_version.pod

diff --git a/doc/ssl/SSL_CTX_set_ssl_version.pod b/doc/ssl/SSL_CTX_set_ssl_version.pod
index 0020180..254f2b4 100644
--- a/doc/ssl/SSL_CTX_set_ssl_version.pod
+++ b/doc/ssl/SSL_CTX_set_ssl_version.pod
@@ -9,9 +9,9 @@
 
  #include <openssl/ssl.h>
 
- int SSL_CTX_set_ssl_version(SSL_CTX *ctx, SSL_METHOD *method);
- int SSL_set_ssl_method(SSL *s, SSL_METHOD *method);
- SSL_METHOD *SSL_get_ssl_method(SSL *ssl);
+ int SSL_CTX_set_ssl_version(SSL_CTX *ctx, const SSL_METHOD *method);
+ int SSL_set_ssl_method(SSL *s, const SSL_METHOD *method);
+ const SSL_METHOD *SSL_get_ssl_method(SSL *ssl);
 
 =head1 DESCRIPTION
 

doc/ssl/ssl.pod

diff --git a/doc/ssl/ssl.pod b/doc/ssl/ssl.pod
index 266697d..8391c66 100644
--- a/doc/ssl/ssl.pod
+++ b/doc/ssl/ssl.pod
@@ -130,39 +130,39 @@
 
 =over 4
 
-=item SSL_METHOD *B<SSLv2_client_method>(void);
+=item const SSL_METHOD *B<SSLv2_client_method>(void);
 
 Constructor for the SSLv2 SSL_METHOD structure for a dedicated client.
 
-=item SSL_METHOD *B<SSLv2_server_method>(void);
+=item const SSL_METHOD *B<SSLv2_server_method>(void);
 
 Constructor for the SSLv2 SSL_METHOD structure for a dedicated server.
 
-=item SSL_METHOD *B<SSLv2_method>(void);
+=item const SSL_METHOD *B<SSLv2_method>(void);
 
 Constructor for the SSLv2 SSL_METHOD structure for combined client and server.
 
-=item SSL_METHOD *B<SSLv3_client_method>(void);
+=item const SSL_METHOD *B<SSLv3_client_method>(void);
 
 Constructor for the SSLv3 SSL_METHOD structure for a dedicated client.
 
-=item SSL_METHOD *B<SSLv3_server_method>(void);
+=item const SSL_METHOD *B<SSLv3_server_method>(void);
 
 Constructor for the SSLv3 SSL_METHOD structure for a dedicated server.
 
-=item SSL_METHOD *B<SSLv3_method>(void);
+=item const SSL_METHOD *B<SSLv3_method>(void);
 
 Constructor for the SSLv3 SSL_METHOD structure for combined client and server.
 
-=item SSL_METHOD *B<TLSv1_client_method>(void);
+=item const SSL_METHOD *B<TLSv1_client_method>(void);
 
 Constructor for the TLSv1 SSL_METHOD structure for a dedicated client.
 
-=item SSL_METHOD *B<TLSv1_server_method>(void);
+=item cosnt SSL_METHOD *B<TLSv1_server_method>(void);
 
 Constructor for the TLSv1 SSL_METHOD structure for a dedicated server.
 
-=item SSL_METHOD *B<TLSv1_method>(void);
+=item const SSL_METHOD *B<TLSv1_method>(void);
 
 Constructor for the TLSv1 SSL_METHOD structure for combined client and server.
 
@@ -249,7 +249,7 @@
 
 =item long B<SSL_CTX_need_tmp_RSA>(SSL_CTX *ctx);
 
-=item SSL_CTX *B<SSL_CTX_new>(SSL_METHOD *meth);
+=item SSL_CTX *B<SSL_CTX_new>(const SSL_METHOD *meth);
 
 =item int B<SSL_CTX_remove_session>(SSL_CTX *ctx, SSL_SESSION *c);
 
@@ -327,7 +327,7 @@
 
 =item void B<SSL_CTX_set_session_cache_mode>(SSL_CTX *ctx, int mode);
 
-=item int B<SSL_CTX_set_ssl_version>(SSL_CTX *ctx, SSL_METHOD *meth);
+=item int B<SSL_CTX_set_ssl_version>(SSL_CTX *ctx, const SSL_METHOD *meth);
 
 =item void B<SSL_CTX_set_timeout>(SSL_CTX *ctx, long t);
 
@@ -512,7 +512,7 @@
 
 =item int B<SSL_get_shutdown>(const SSL *ssl);
 
-=item SSL_METHOD *B<SSL_get_ssl_method>(SSL *ssl);
+=item const SSL_METHOD *B<SSL_get_ssl_method>(SSL *ssl);
 
 =item int B<SSL_get_state>(const SSL *ssl);
 
@@ -596,7 +596,7 @@
 
 =item void B<SSL_set_shutdown>(SSL *ssl, int mode);
 
-=item int B<SSL_set_ssl_method>(SSL *ssl, SSL_METHOD *meth);
+=item int B<SSL_set_ssl_method>(SSL *ssl, const SSL_METHOD *meth);
 
 =item void B<SSL_set_time>(SSL *ssl, long t);