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+.\"	$NetBSD: SSL_CTX_set_tmp_rsa_callback.3,v 1.1.1.1 2018/02/03 22:43:39 christos Exp $
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+.\" ========================================================================
+.\"
+.IX Title "SSL_CTX_set_tmp_rsa_callback 3"
+.TH SSL_CTX_set_tmp_rsa_callback 3 "2016-10-14" "1.0.2k" "OpenSSL"
+.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
+.\" way too many mistakes in technical documents.
+.if n .ad l
+.nh
+.SH "NAME"
+SSL_CTX_set_tmp_rsa_callback, SSL_CTX_set_tmp_rsa, SSL_CTX_need_tmp_rsa, SSL_set_tmp_rsa_callback, SSL_set_tmp_rsa, SSL_need_tmp_rsa \- handle RSA keys for ephemeral key exchange
+.SH "LIBRARY"
+libcrypto, -lcrypto
+.SH "SYNOPSIS"
+.IX Header "SYNOPSIS"
+.Vb 1
+\& #include <openssl/ssl.h>
+\&
+\& void SSL_CTX_set_tmp_rsa_callback(SSL_CTX *ctx,
+\&            RSA *(*tmp_rsa_callback)(SSL *ssl, int is_export, int keylength));
+\& long SSL_CTX_set_tmp_rsa(SSL_CTX *ctx, RSA *rsa);
+\& long SSL_CTX_need_tmp_rsa(SSL_CTX *ctx);
+\&
+\& void SSL_set_tmp_rsa_callback(SSL_CTX *ctx,
+\&            RSA *(*tmp_rsa_callback)(SSL *ssl, int is_export, int keylength));
+\& long SSL_set_tmp_rsa(SSL *ssl, RSA *rsa)
+\& long SSL_need_tmp_rsa(SSL *ssl)
+\&
+\& RSA *(*tmp_rsa_callback)(SSL *ssl, int is_export, int keylength);
+.Ve
+.SH "DESCRIPTION"
+.IX Header "DESCRIPTION"
+\&\fISSL_CTX_set_tmp_rsa_callback()\fR sets the callback function for \fBctx\fR to be
+used when a temporary/ephemeral \s-1RSA\s0 key is required to \fBtmp_rsa_callback\fR.
+The callback is inherited by all \s-1SSL\s0 objects newly created from \fBctx\fR
+with <\fISSL_new\fR\|(3)|\fISSL_new\fR\|(3)>. Already created \s-1SSL\s0 objects are not affected.
+.PP
+\&\fISSL_CTX_set_tmp_rsa()\fR sets the temporary/ephemeral \s-1RSA\s0 key to be used to be
+\&\fBrsa\fR. The key is inherited by all \s-1SSL\s0 objects newly created from \fBctx\fR
+with <\fISSL_new\fR\|(3)|\fISSL_new\fR\|(3)>. Already created \s-1SSL\s0 objects are not affected.
+.PP
+\&\fISSL_CTX_need_tmp_rsa()\fR returns 1, if a temporary/ephemeral \s-1RSA\s0 key is needed
+for RSA-based strength-limited 'exportable' ciphersuites because a \s-1RSA\s0 key
+with a keysize larger than 512 bits is installed.
+.PP
+\&\fISSL_set_tmp_rsa_callback()\fR sets the callback only for \fBssl\fR.
+.PP
+\&\fISSL_set_tmp_rsa()\fR sets the key only for \fBssl\fR.
+.PP
+\&\fISSL_need_tmp_rsa()\fR returns 1, if a temporary/ephemeral \s-1RSA\s0 key is needed,
+for RSA-based strength-limited 'exportable' ciphersuites because a \s-1RSA\s0 key
+with a keysize larger than 512 bits is installed.
+.PP
+These functions apply to \s-1SSL/TLS\s0 servers only.
+.SH "NOTES"
+.IX Header "NOTES"
+When using a cipher with \s-1RSA\s0 authentication, an ephemeral \s-1RSA\s0 key exchange
+can take place. In this case the session data are negotiated using the
+ephemeral/temporary \s-1RSA\s0 key and the \s-1RSA\s0 key supplied and certified
+by the certificate chain is only used for signing.
+.PP
+Under previous export restrictions, ciphers with \s-1RSA\s0 keys shorter (512 bits)
+than the usual key length of 1024 bits were created. To use these ciphers
+with \s-1RSA\s0 keys of usual length, an ephemeral key exchange must be performed,
+as the normal (certified) key cannot be directly used.
+.PP
+Using ephemeral \s-1RSA\s0 key exchange yields forward secrecy, as the connection
+can only be decrypted, when the \s-1RSA\s0 key is known. By generating a temporary
+\&\s-1RSA\s0 key inside the server application that is lost when the application
+is left, it becomes impossible for an attacker to decrypt past sessions,
+even if he gets hold of the normal (certified) \s-1RSA\s0 key, as this key was
+used for signing only. The downside is that creating a \s-1RSA\s0 key is
+computationally expensive.
+.PP
+Additionally, the use of ephemeral \s-1RSA\s0 key exchange is only allowed in
+the \s-1TLS\s0 standard, when the \s-1RSA\s0 key can be used for signing only, that is
+for export ciphers. Using ephemeral \s-1RSA\s0 key exchange for other purposes
+violates the standard and can break interoperability with clients.
+It is therefore strongly recommended to not use ephemeral \s-1RSA\s0 key
+exchange and use \s-1DHE \s0(Ephemeral Diffie-Hellman) key exchange instead
+in order to achieve forward secrecy (see
+\&\fISSL_CTX_set_tmp_dh_callback\fR\|(3)).
+.PP
+An application may either directly specify the key or can supply the key via a
+callback function. The callback approach has the advantage, that the callback
+may generate the key only in case it is actually needed. As the generation of a
+\&\s-1RSA\s0 key is however costly, it will lead to a significant delay in the handshake
+procedure.  Another advantage of the callback function is that it can supply
+keys of different size while the explicit setting of the key is only useful for
+key size of 512 bits to satisfy the export restricted ciphers and does give
+away key length if a longer key would be allowed.
+.PP
+The \fBtmp_rsa_callback\fR is called with the \fBkeylength\fR needed and
+the \fBis_export\fR information. The \fBis_export\fR flag is set, when the
+ephemeral \s-1RSA\s0 key exchange is performed with an export cipher.
+.SH "EXAMPLES"
+.IX Header "EXAMPLES"
+Generate temporary \s-1RSA\s0 keys to prepare ephemeral \s-1RSA\s0 key exchange. As the
+generation of a \s-1RSA\s0 key costs a lot of computer time, they saved for later
+reuse. For demonstration purposes, two keys for 512 bits and 1024 bits
+respectively are generated.
+.PP
+.Vb 4
+\& ...
+\& /* Set up ephemeral RSA stuff */
+\& RSA *rsa_512 = NULL;
+\& RSA *rsa_1024 = NULL;
+\&
+\& rsa_512 = RSA_generate_key(512,RSA_F4,NULL,NULL);
+\& if (rsa_512 == NULL)
+\&     evaluate_error_queue();
+\&
+\& rsa_1024 = RSA_generate_key(1024,RSA_F4,NULL,NULL);
+\& if (rsa_1024 == NULL)
+\&   evaluate_error_queue();
+\&
+\& ...
+\&
+\& RSA *tmp_rsa_callback(SSL *s, int is_export, int keylength)
+\& {
+\&    RSA *rsa_tmp=NULL;
+\&
+\&    switch (keylength) {
+\&    case 512:
+\&      if (rsa_512)
+\&        rsa_tmp = rsa_512;
+\&      else { /* generate on the fly, should not happen in this example */
+\&        rsa_tmp = RSA_generate_key(keylength,RSA_F4,NULL,NULL);
+\&        rsa_512 = rsa_tmp; /* Remember for later reuse */
+\&      }
+\&      break;
+\&    case 1024:
+\&      if (rsa_1024)
+\&        rsa_tmp=rsa_1024;
+\&      else
+\&        should_not_happen_in_this_example();
+\&      break;
+\&    default:
+\&      /* Generating a key on the fly is very costly, so use what is there */
+\&      if (rsa_1024)
+\&        rsa_tmp=rsa_1024;
+\&      else
+\&        rsa_tmp=rsa_512; /* Use at least a shorter key */
+\&    }
+\&    return(rsa_tmp);
+\& }
+.Ve
+.SH "RETURN VALUES"
+.IX Header "RETURN VALUES"
+\&\fISSL_CTX_set_tmp_rsa_callback()\fR and \fISSL_set_tmp_rsa_callback()\fR do not return
+diagnostic output.
+.PP
+\&\fISSL_CTX_set_tmp_rsa()\fR and \fISSL_set_tmp_rsa()\fR do return 1 on success and 0
+on failure. Check the error queue to find out the reason of failure.
+.PP
+\&\fISSL_CTX_need_tmp_rsa()\fR and \fISSL_need_tmp_rsa()\fR return 1 if a temporary
+\&\s-1RSA\s0 key is needed and 0 otherwise.
+.SH "SEE ALSO"
+.IX Header "SEE ALSO"
+\&\fIssl\fR\|(3), \fISSL_CTX_set_cipher_list\fR\|(3),
+\&\fISSL_CTX_set_options\fR\|(3),
+\&\fISSL_CTX_set_tmp_dh_callback\fR\|(3),
+\&\fISSL_new\fR\|(3), \fIopenssl_ciphers\fR\|(1)