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DSA_set_method.3
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Always turn off hyphenation; it makes .\" way too many mistakes in technical documents. .if n .ad l .nh .SH "NAME" DSA_set_default_method, DSA_get_default_method, DSA_set_method, DSA_new_method, DSA_OpenSSL \- select DSA method .SH "SYNOPSIS" .IX Header "SYNOPSIS" .Vb 1 \& #include <openssl/dsa.h> \& \& void DSA_set_default_method(const DSA_METHOD *meth); \& \& const DSA_METHOD *DSA_get_default_method(void); \& \& int DSA_set_method(DSA *dsa, const DSA_METHOD *meth); \& \& DSA *DSA_new_method(ENGINE *engine); \& \& DSA_METHOD *DSA_OpenSSL(void); .Ve .SH "DESCRIPTION" .IX Header "DESCRIPTION" A \fB\s-1DSA_METHOD\s0\fR specifies the functions that OpenSSL uses for \s-1DSA\s0 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-1DSA API\s0 functions are affected by the use of \fB\s-1ENGINE\s0\fR \s-1API\s0 calls. .PP Initially, the default \s-1DSA_METHOD\s0 is the OpenSSL internal implementation, as returned by \fBDSA_OpenSSL()\fR. .PP \&\fBDSA_set_default_method()\fR makes \fBmeth\fR the default method for all \s-1DSA\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-1DSA,\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 \&\fBDSA_get_default_method()\fR returns a pointer to the current default \&\s-1DSA_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 \&\fBDSA_set_method()\fR selects \fBmeth\fR to perform all operations using the key \&\fBrsa\fR. This will replace the \s-1DSA_METHOD\s0 used by the \s-1DSA\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-1DSA\s0 keys that only work with certain \s-1DSA_METHOD\s0 implementations (e.g. from an \s-1ENGINE\s0 module that supports embedded hardware-protected keys), and in such cases attempting to change the \s-1DSA_METHOD\s0 for the key can have unexpected results. See DSA_meth_new for information on constructing custom \s-1DSA_METHOD\s0 objects; .PP \&\fBDSA_new_method()\fR allocates and initializes a \s-1DSA\s0 structure so that \fBengine\fR will be used for the \s-1DSA\s0 operations. If \fBengine\fR is \s-1NULL,\s0 the default engine for \s-1DSA\s0 operations is used, and if no default \s-1ENGINE\s0 is set, the \s-1DSA_METHOD\s0 controlled by \fBDSA_set_default_method()\fR is used. .SH "RETURN VALUES" .IX Header "RETURN VALUES" \&\fBDSA_OpenSSL()\fR and \fBDSA_get_default_method()\fR return pointers to the respective \&\fB\s-1DSA_METHOD\s0\fRs. .PP \&\fBDSA_set_default_method()\fR returns no value. .PP \&\fBDSA_set_method()\fR returns nonzero if the provided \fBmeth\fR was successfully set as the method for \fBdsa\fR (including unloading the \s-1ENGINE\s0 handle if the previous method was supplied by an \s-1ENGINE\s0). .PP \&\fBDSA_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" \&\fBDSA_new\fR\|(3), \fBDSA_new\fR\|(3), \fBDSA_meth_new\fR\|(3) .SH "COPYRIGHT" .IX Header "COPYRIGHT" Copyright 2000\-2020 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>.
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