=pod
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=head1 NAME
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EVP_PKEY_get_default_digest_nid - get default signature digest
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=head1 SYNOPSIS
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#include <openssl/evp.h>
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int EVP_PKEY_get_default_digest_nid(EVP_PKEY *pkey, int *pnid);
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=head1 DESCRIPTION
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The EVP_PKEY_get_default_digest_nid() function sets B<pnid> to the default
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message digest NID for the public key signature operations associated with key
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B<pkey>.
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=head1 NOTES
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For all current standard OpenSSL public key algorithms SHA1 is returned.
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=head1 RETURN VALUES
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The EVP_PKEY_get_default_digest_nid() function returns 1 if the message digest
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is advisory (that is other digests can be used) and 2 if it is mandatory (other
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digests can not be used). It returns 0 or a negative value for failure. In
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particular a return value of -2 indicates the operation is not supported by the
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public key algorithm.
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=head1 SEE ALSO
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L<EVP_PKEY_CTX_new(3)|EVP_PKEY_CTX_new(3)>,
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L<EVP_PKEY_sign(3)|EVP_PKEY_sign(3)>,
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L<EVP_PKEY_verify(3)|EVP_PKEY_verify(3)>,
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L<EVP_PKEY_verify_recover(3)|EVP_PKEY_verify_recover(3)>,
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=head1 HISTORY
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This function was first added to OpenSSL 1.0.0.
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=cut
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