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Title "RSA_CHECK_KEY 3" For nroff, turn off justification. Always turn off hyphenation; it makes
way too many mistakes in technical documents.
RSA_check_key_ex, RSA_check_key - validate private RSA keys Header "SYNOPSIS" .Vb 1 #include <openssl/rsa.h> .Ve

The following functions have been deprecated since OpenSSL 3.0, and can be hidden entirely by defining \s-1OPENSSL_API_COMPAT\s0 with a suitable version value, see openssl_user_macros\|(7):

.Vb 1 int RSA_check_key_ex(const RSA *rsa, BN_GENCB *cb); \& int RSA_check_key(const RSA *rsa); .Ve

Header "DESCRIPTION" Both of the functions described on this page are deprecated. Applications should instead use EVP_PKEY_public_check\|(3), \fBEVP_PKEY_private_check\|(3) and EVP_PKEY_pairwise_check\|(3).

\fBRSA_check_key_ex() function validates \s-1RSA\s0 keys. It checks that p and q are in fact prime, and that n = p*q.

It does not work on \s-1RSA\s0 public keys that have only the modulus and public exponent elements populated. It also checks that d*e = 1 mod (p-1*q-1), and that dmp1, dmq1 and iqmp are set correctly or are \s-1NULL\s0. It performs integrity checks on all the \s-1RSA\s0 key material, so the \s-1RSA\s0 key structure must contain all the private key data too. Therefore, it cannot be used with any arbitrary \s-1RSA\s0 key object, even if it is otherwise fit for regular \s-1RSA\s0 operation.

The cb parameter is a callback that will be invoked in the same manner as BN_is_prime_ex\|(3).

\fBRSA_check_key() is equivalent to RSA_check_key_ex() with a \s-1NULL\s0 cb.

Header "RETURN VALUES" \fBRSA_check_key_ex() and RSA_check_key() return 1 if rsa is a valid \s-1RSA\s0 key, and 0 otherwise. They return -1 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).

Header "NOTES" Unlike most other \s-1RSA\s0 functions, this function does not work transparently with any underlying \s-1ENGINE\s0 implementation because it uses the key data in the \s-1RSA\s0 structure directly. An \s-1ENGINE\s0 implementation can override the way key data is stored and handled, and can even provide support for \s-1HSM\s0 keys - in which case the \s-1RSA\s0 structure may contain no key data at all! If the \s-1ENGINE\s0 in question is only being used for acceleration or analysis purposes, then in all likelihood the \s-1RSA\s0 key data is complete and untouched, but this can't be assumed in the general case. Header "BUGS" A method of verifying the \s-1RSA\s0 key using opaque \s-1RSA API\s0 functions might need to be considered. Right now RSA_check_key() simply uses the \s-1RSA\s0 structure elements directly, bypassing the \s-1RSA_METHOD\s0 table altogether (and completely violating encapsulation and object-orientation in the process). The best fix will probably be to introduce a \*(L"check_key()\*(R" handler to the \s-1RSA_METHOD\s0 function table so that alternative implementations can also provide their own verifiers. Header "SEE ALSO" \fBBN_is_prime_ex\|(3), \fBERR_get_error\|(3) Header "HISTORY" All of these functions were deprecated in OpenSSL 3.0.

\fBRSA_check_key_ex() appeared after OpenSSL 1.0.2.

Header "COPYRIGHT" Copyright 2000-2021 The OpenSSL Project Authors. All Rights Reserved.

Licensed under the Apache License 2.0 (the \*(L"License\*(R"). You may not use this file except in compliance with the License. You can obtain a copy in the file \s-1LICENSE\s0 in the source distribution or at <https://www.openssl.org/source/license.html>.