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EVP_PKEY_get_default_digest_name() may return 1 with the returned digest name "UNDEF". This case hasn't been documented, and the meaning has been left undefined, until now. Reviewed-by: Todd Short <todd.short@me.com> Reviewed-by: Tomas Mraz <tomas@openssl.org> (Merged from https://github.com/openssl/openssl/pull/20460)
68 lines
2.2 KiB
Plaintext
68 lines
2.2 KiB
Plaintext
=pod
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=head1 NAME
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EVP_PKEY_get_default_digest_nid, EVP_PKEY_get_default_digest_name
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- 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_name(EVP_PKEY *pkey,
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char *mdname, size_t mdname_sz);
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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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EVP_PKEY_get_default_digest_name() fills in the default message digest
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name for the public key signature operations associated with key
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I<pkey> into I<mdname>, up to at most I<mdname_sz> bytes including the
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ending NUL byte. The name could be C<"UNDEF">, signifying that a digest
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must (for return value 2) or may (for return value 1) be left unspecified.
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EVP_PKEY_get_default_digest_nid() sets I<pnid> to the default message
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digest NID for the public key signature operations associated with key
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I<pkey>. Note that some signature algorithms (i.e. Ed25519 and Ed448)
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do not use a digest during signing. In this case I<pnid> will be set
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to NID_undef. This function is only reliable for legacy keys, which
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are keys with a B<EVP_PKEY_ASN1_METHOD>; these keys have typically
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been loaded from engines, or created with L<EVP_PKEY_assign_RSA(3)> or
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similar.
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=head1 NOTES
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For all current standard OpenSSL public key algorithms SHA256 is returned.
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=head1 RETURN VALUES
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EVP_PKEY_get_default_digest_name() and EVP_PKEY_get_default_digest_nid()
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both return 1 if the message digest is advisory (that is other digests
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can be used) and 2 if it is mandatory (other digests can not be used).
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They return 0 or a negative value for failure. In particular a return
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value of -2 indicates the operation is not supported by the public key
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algorithm.
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=head1 SEE ALSO
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L<EVP_PKEY_CTX_new(3)>,
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L<EVP_PKEY_sign(3)>,
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L<EVP_PKEY_digestsign_supports_digest(3)>,
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L<EVP_PKEY_verify(3)>,
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L<EVP_PKEY_verify_recover(3)>,
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=head1 HISTORY
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This function was added in OpenSSL 1.0.0.
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=head1 COPYRIGHT
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Copyright 2006-2021 The OpenSSL Project Authors. All Rights Reserved.
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Licensed under the Apache License 2.0 (the "License"). You may not use
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this file except in compliance with the License. You can obtain a copy
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in the file LICENSE in the source distribution or at
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L<https://www.openssl.org/source/license.html>.
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=cut
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