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diff --git a/src/lib/libcrypto/doc/RSA_check_key.pod b/src/lib/libcrypto/doc/RSA_check_key.pod
new file mode 100644
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+++ b/src/lib/libcrypto/doc/RSA_check_key.pod
@@ -0,0 +1,39 @@
+=pod
+
+=head1 NAME
+
+RSA_check_key - validate private RSA keys
+
+=head1 SYNOPSIS
+
+ #include <openssl/rsa.h>
+
+ int RSA_check_key(RSA *rsa);
+
+=head1 DESCRIPTION
+
+This function validates RSA keys. It checks that B<p> and B<q> are
+in fact prime, and that B<n = p*q>.
+
+It also checks that B<d*e = 1 mod (p-1*q-1)>,
+and that B<dmp1>, B<dmq1> and B<iqmp> are set correctly or are B<NULL>.
+
+The key's public components may not be B<NULL>.
+
+=head1 RETURN VALUE
+
+RSA_check_key() returns 1 if B<rsa> 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 L<ERR_get_error(3)|ERR_get_error(3)>.
+
+=head1 SEE ALSO
+
+L<rsa(3)|rsa(3)>, L<err(3)|err(3)>
+
+=head1 HISTORY
+
+RSA_check() appeared in OpenSSL 0.9.4.
+
+=cut