Manual Pages for UNIX Operating System command usage for man RSA_check_key

OpenSSL                                   RSA_check_key(3openssl)



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     RSA_check_key - validate private RSA keys

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      #include 

      int RSA_check_key(RSA *rsa);


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     This function validates RSA keys. It checks that pppp and qqqq are
     in fact prime, and that nnnn ==== pppp****qqqq.

     It also checks that dddd****eeee ==== 1111 mmmmoooodddd ((((pppp----1111****qqqq----1111)))), and that ddddmmmmpppp1111,
     ddddmmmmqqqq1111 and iiiiqqqqmmmmpppp are set correctly or are NNNNUUUULLLLLLLL.

     As such, this function can not be used with any arbitrary
     RSA key object, even if it is otherwise fit for regular RSA
     operation. See NNNNOOOOTTTTEEEESSSS for more information.

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     RSA_check_key() returns 1 if rrrrssssaaaa is a valid RSA key, and 0
     otherwise.  -1 is returned if an error occurs while checking
     the key.

     If the key is invalid or an error occurred, the reason code
     can be obtained using ERR_get_error(3).

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     This function does not work on RSA public keys that have
     only the modulus and public exponent elements populated. It
     performs integrity checks on all the RSA key material, so
     the RSA key structure must contain all the private key data
     too.

     Unlike most other RSA functions, this function does nnnnooootttt work
     transparently with any underlying ENGINE implementation
     because it uses the key data in the RSA structure directly.
     An ENGINE implementation can override the way key data is
     stored and handled, and can even provide support for HSM
     keys - in which case the RSA structure may contain nnnnoooo key
     data at all! If the ENGINE in question is only being used
     for acceleration or analysis purposes, then in all
     likelihood the RSA key data is complete and untouched, but
     this can't be assumed in the general case.

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     A method of verifying the RSA key using opaque RSA API
     functions might need to be considered. Right now
     RSA_check_key() simply uses the RSA structure elements
     directly, bypassing the RSA_METHOD table altogether (and
     completely violating encapsulation and object-orientation in



25/Sep/2002            Last change: 0.9.8o                      1






OpenSSL                                   RSA_check_key(3openssl)



     the process).  The best fix will probably be to introduce a
     "check_key()" handler to the RSA_METHOD function table so
     that alternative implementations can also provide their own
     verifiers.

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     rsa(3), ERR_get_error(3)

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     RSA_check_key() appeared in OpenSSL 0.9.4.













































25/Sep/2002            Last change: 0.9.8o                      2