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Diffstat (limited to 'secure/lib/libcrypto/man/man3/DH_set_method.3')
| -rw-r--r-- | secure/lib/libcrypto/man/man3/DH_set_method.3 | 219 |
1 files changed, 219 insertions, 0 deletions
diff --git a/secure/lib/libcrypto/man/man3/DH_set_method.3 b/secure/lib/libcrypto/man/man3/DH_set_method.3 new file mode 100644 index 000000000000..3702353f11e9 --- /dev/null +++ b/secure/lib/libcrypto/man/man3/DH_set_method.3 @@ -0,0 +1,219 @@ +.\" Automatically generated by Pod::Man 4.11 (Pod::Simple 3.39) +.\" +.\" Standard preamble: +.\" ======================================================================== +.de Sp \" Vertical space (when we can't use .PP) +.if t .sp .5v +.if n .sp +.. +.de Vb \" Begin verbatim text +.ft CW +.nf +.ne \\$1 +.. +.de Ve \" End verbatim text +.ft R +.fi +.. +.\" Set up some character translations and predefined strings. \*(-- will +.\" give an unbreakable dash, \*(PI will give pi, \*(L" will give a left +.\" double quote, and \*(R" will give a right double quote. \*(C+ will +.\" give a nicer C++. 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Always turn off hyphenation; it makes +.\" way too many mistakes in technical documents. +.if n .ad l +.nh +.SH "NAME" +DH_set_default_method, DH_get_default_method, DH_set_method, DH_new_method, DH_OpenSSL \- select DH method +.SH "SYNOPSIS" +.IX Header "SYNOPSIS" +.Vb 1 +\& #include <openssl/dh.h> +\& +\& void DH_set_default_method(const DH_METHOD *meth); +\& +\& const DH_METHOD *DH_get_default_method(void); +\& +\& int DH_set_method(DH *dh, const DH_METHOD *meth); +\& +\& DH *DH_new_method(ENGINE *engine); +\& +\& const DH_METHOD *DH_OpenSSL(void); +.Ve +.SH "DESCRIPTION" +.IX Header "DESCRIPTION" +A \fB\s-1DH_METHOD\s0\fR specifies the functions that OpenSSL uses for Diffie-Hellman +operations. By modifying the method, alternative implementations +such as hardware accelerators may be used. \s-1IMPORTANT:\s0 See the \s-1NOTES\s0 section for +important information about how these \s-1DH API\s0 functions are affected by the use +of \fB\s-1ENGINE\s0\fR \s-1API\s0 calls. +.PP +Initially, the default \s-1DH_METHOD\s0 is the OpenSSL internal implementation, as +returned by \fBDH_OpenSSL()\fR. +.PP +\&\fBDH_set_default_method()\fR makes \fBmeth\fR the default method for all \s-1DH\s0 +structures created later. +\&\fB\s-1NB\s0\fR: This is true only whilst no \s-1ENGINE\s0 has been set +as a default for \s-1DH,\s0 so this function is no longer recommended. +This function is not thread-safe and should not be called at the same time +as other OpenSSL functions. +.PP +\&\fBDH_get_default_method()\fR returns a pointer to the current default \s-1DH_METHOD.\s0 +However, the meaningfulness of this result is dependent on whether the \s-1ENGINE +API\s0 is being used, so this function is no longer recommended. +.PP +\&\fBDH_set_method()\fR selects \fBmeth\fR to perform all operations using the key \fBdh\fR. +This will replace the \s-1DH_METHOD\s0 used by the \s-1DH\s0 key and if the previous method +was supplied by an \s-1ENGINE,\s0 the handle to that \s-1ENGINE\s0 will be released during the +change. It is possible to have \s-1DH\s0 keys that only work with certain \s-1DH_METHOD\s0 +implementations (eg. from an \s-1ENGINE\s0 module that supports embedded +hardware-protected keys), and in such cases attempting to change the \s-1DH_METHOD\s0 +for the key can have unexpected results. +.PP +\&\fBDH_new_method()\fR allocates and initializes a \s-1DH\s0 structure so that \fBengine\fR will +be used for the \s-1DH\s0 operations. If \fBengine\fR is \s-1NULL,\s0 the default \s-1ENGINE\s0 for \s-1DH\s0 +operations is used, and if no default \s-1ENGINE\s0 is set, the \s-1DH_METHOD\s0 controlled by +\&\fBDH_set_default_method()\fR is used. +.PP +A new \s-1DH_METHOD\s0 object may be constructed using \fBDH_meth_new()\fR (see +\&\fBDH_meth_new\fR\|(3)). +.SH "RETURN VALUES" +.IX Header "RETURN VALUES" +\&\fBDH_OpenSSL()\fR and \fBDH_get_default_method()\fR return pointers to the respective +\&\fB\s-1DH_METHOD\s0\fRs. +.PP +\&\fBDH_set_default_method()\fR returns no value. +.PP +\&\fBDH_set_method()\fR returns non-zero if the provided \fBmeth\fR was successfully set as +the method for \fBdh\fR (including unloading the \s-1ENGINE\s0 handle if the previous +method was supplied by an \s-1ENGINE\s0). +.PP +\&\fBDH_new_method()\fR returns \s-1NULL\s0 and sets an error code that can be obtained by +\&\fBERR_get_error\fR\|(3) if the allocation fails. Otherwise it +returns a pointer to the newly allocated structure. +.SH "SEE ALSO" +.IX Header "SEE ALSO" +\&\fBDH_new\fR\|(3), \fBDH_new\fR\|(3), \fBDH_meth_new\fR\|(3) +.SH "COPYRIGHT" +.IX Header "COPYRIGHT" +Copyright 2000\-2016 The OpenSSL Project Authors. All Rights Reserved. +.PP +Licensed under the OpenSSL license (the \*(L"License\*(R"). You may not use +this file except in compliance with the License. You can obtain a copy +in the file \s-1LICENSE\s0 in the source distribution or at +<https://www.openssl.org/source/license.html>. |