1EVP_PKEY_GET_DEFAULT_DIGEST_NID(3)  OpenSSL EVP_PKEY_GET_DEFAULT_DIGEST_NID(3)
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NAME

6       EVP_PKEY_get_default_digest_nid - get default signature digest
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SYNOPSIS

9        #include <openssl/evp.h>
10        int EVP_PKEY_get_default_digest_nid(EVP_PKEY *pkey, int *pnid);
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DESCRIPTION

13       The EVP_PKEY_get_default_digest_nid() function sets pnid to the default
14       message digest NID for the public key signature operations associated
15       with key pkey. Note that some signature algorithms (i.e. Ed25519 and
16       Ed448) do not use a digest during signing. In this case pnid will be
17       set to NID_undef.
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NOTES

20       For all current standard OpenSSL public key algorithms SHA1 is
21       returned.
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RETURN VALUES

24       The EVP_PKEY_get_default_digest_nid() function returns 1 if the message
25       digest is advisory (that is other digests can be used) and 2 if it is
26       mandatory (other digests can not be used).  It returns 0 or a negative
27       value for failure. In particular a return value of -2 indicates the
28       operation is not supported by the public key algorithm.
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SEE ALSO

31       EVP_PKEY_CTX_new(3), EVP_PKEY_sign(3), EVP_PKEY_verify(3),
32       EVP_PKEY_verify_recover(3),
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HISTORY

35       This function was added in OpenSSL 1.0.0.
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38       Copyright 2006-2018 The OpenSSL Project Authors. All Rights Reserved.
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40       Licensed under the OpenSSL license (the "License").  You may not use
41       this file except in compliance with the License.  You can obtain a copy
42       in the file LICENSE in the source distribution or at
43       <https://www.openssl.org/source/license.html>.
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471.1.1i                            2021-07-22EVP_PKEY_GET_DEFAULT_DIGEST_NID(3)
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