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.IX Title "EVP_PKEY_GET_DEFAULT_DIGEST_NID 3"
.TH EVP_PKEY_GET_DEFAULT_DIGEST_NID 3 "2023-09-11" "1.1.1w" "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"
EVP_PKEY_get_default_digest_nid \- get default signature digest
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 2
\& #include <openssl/evp.h>
\& int EVP_PKEY_get_default_digest_nid(EVP_PKEY *pkey, int *pnid);
.Ve
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
The \fIEVP_PKEY_get_default_digest_nid()\fR function sets \fBpnid\fR to the default
message digest \s-1NID\s0 for the public key signature operations associated with key
\&\fBpkey\fR. Note that some signature algorithms (i.e. Ed25519 and Ed448) do not use
a digest during signing. In this case \fBpnid\fR will be set to NID_undef.
.SH "NOTES"
.IX Header "NOTES"
For all current standard OpenSSL public key algorithms \s-1SHA1\s0 is returned.
.SH "RETURN VALUES"
.IX Header "RETURN VALUES"
The \fIEVP_PKEY_get_default_digest_nid()\fR function returns 1 if the message digest
is advisory (that is other digests can be used) and 2 if it is mandatory (other
digests can not be used).  It returns 0 or a negative value for failure. In
particular a return value of \-2 indicates the operation is not supported by the
public key algorithm.
.SH "SEE ALSO"
.IX Header "SEE ALSO"
\&\fIEVP_PKEY_CTX_new\fR\|(3),
\&\fIEVP_PKEY_sign\fR\|(3),
\&\fIEVP_PKEY_verify\fR\|(3),
\&\fIEVP_PKEY_verify_recover\fR\|(3),
.SH "HISTORY"
.IX Header "HISTORY"
This function was added in OpenSSL 1.0.0.
.SH "COPYRIGHT"
.IX Header "COPYRIGHT"
Copyright 2006\-2018 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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