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Fix OSSL_DECODER_new_for_pkey() selection parameter documentation
Fixes #14518 EVP_PKEY_fromdata() already defines this value so we link to this documentation, 0 is also added as a possible input value. Reviewed-by: Tomas Mraz <tomas@openssl.org> Reviewed-by: Paul Dale <pauli@openssl.org> (Merged from https://github.com/openssl/openssl/pull/15260)
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@ -108,6 +108,13 @@ C<type-specific>. This is the structure used for keys encoded
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according to key type specific specifications. For example, RSA keys
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encoded according to PKCS#1.
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=head2 Selections
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I<selection> can be any one of the values described in
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L<EVP_PKEY_fromdata(3)/Selections>.
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Additionally I<selection> can also be set to B<0> to indicate that the code will
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auto detect the selection.
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=head1 RETURN VALUES
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OSSL_DECODER_CTX_new_for_pkey() returns a pointer to a
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@ -108,38 +108,10 @@ The output is the I<selection> of the I<pkey> in PEM format.
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=head2 Selections
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=begin comment
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I<selection> can be any one of the values described in
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L<EVP_PKEY_fromdata(3)/Selections>.
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These constants should really be documented among the EVP manuals, but this
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will have to do for now.
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=end comment
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The following constants can be used for standard I<selection>:
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=over 4
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=item B<EVP_PKEY_KEY_PARAMETERS>
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Indicates that only the key parameters should be included in the output.
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Where it matters, the data type in the output will indicate that the data is
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parameters, not a key.
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=item B<EVP_PKEY_PUBLIC_KEY>
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Indicates that the public key and eventual key parameters will be included
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in the output. Where it matters, the data type in the output will indicate
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that the data is a public key.
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=item B<EVP_PKEY_KEYPAIR>
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Indicates that the private key, the public key and eventual key parameters
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should be included in the output. Where it matters, the data type in the
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output will indicate that the data is a private key.
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=back
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These are only indications, the encoder implementations are free to
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These are only 'hints' since the encoder implementations are free to
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determine what makes sense to include in the output, and this may depend on
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the desired output. For example, an EC key in a PKCS#8 structure doesn't
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usually include the public key.
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