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6859cf7459
manual when the specific function is refered to in the current manual text. This correction was originally introduced in OpenBSD's tracking of OpenSSL.
68 lines
2.2 KiB
Plaintext
68 lines
2.2 KiB
Plaintext
=pod
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=head1 NAME
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RSA_check_key - validate private RSA keys
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=head1 SYNOPSIS
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#include <openssl/rsa.h>
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int RSA_check_key(RSA *rsa);
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=head1 DESCRIPTION
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This function validates RSA keys. It checks that B<p> and B<q> are
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in fact prime, and that B<n = p*q>.
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It also checks that B<d*e = 1 mod (p-1*q-1)>,
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and that B<dmp1>, B<dmq1> and B<iqmp> are set correctly or are B<NULL>.
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As such, this function can not be used with any arbitrary RSA key object,
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even if it is otherwise fit for regular RSA operation. See B<NOTES> for more
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information.
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=head1 RETURN VALUE
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RSA_check_key() returns 1 if B<rsa> is a valid RSA key, and 0 otherwise.
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-1 is returned if an error occurs while checking the key.
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If the key is invalid or an error occurred, the reason code can be
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obtained using L<ERR_get_error(3)|ERR_get_error(3)>.
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=head1 NOTES
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This function does not work on RSA public keys that have only the modulus
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and public exponent elements populated. It performs integrity checks on all
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the RSA key material, so the RSA key structure must contain all the private
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key data too.
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Unlike most other RSA functions, this function does B<not> work
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transparently with any underlying ENGINE implementation because it uses the
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key data in the RSA structure directly. An ENGINE implementation can
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override the way key data is stored and handled, and can even provide
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support for HSM keys - in which case the RSA structure may contain B<no>
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key data at all! If the ENGINE in question is only being used for
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acceleration or analysis purposes, then in all likelihood the RSA key data
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is complete and untouched, but this can't be assumed in the general case.
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=head1 BUGS
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A method of verifying the RSA key using opaque RSA API functions might need
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to be considered. Right now RSA_check_key() simply uses the RSA structure
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elements directly, bypassing the RSA_METHOD table altogether (and
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completely violating encapsulation and object-orientation in the process).
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The best fix will probably be to introduce a "check_key()" handler to the
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RSA_METHOD function table so that alternative implementations can also
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provide their own verifiers.
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=head1 SEE ALSO
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L<rsa(3)|rsa(3)>, L<ERR_get_error(3)|ERR_get_error(3)>
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=head1 HISTORY
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RSA_check_key() appeared in OpenSSL 0.9.4.
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=cut
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