RT3462: Document actions when data==NULL

If data is NULL, return the size needed to hold the
derived key.  No other API to do this, so document
the behavior.

Reviewed-by: Richard Levitte <levitte@openssl.org>
(cherry picked from commit 5aed169305941fb1eba15fd4bacc0f998b0e43f7)

diff --git a/doc/crypto/EVP_BytesToKey.pod b/doc/crypto/EVP_BytesToKey.pod
index cd09b68ca82d7f6c41199c259fa83f99d48781d7..5d6059528e6d430ab8d5177de429361998b7d745 100644 (file)
--- a/doc/crypto/EVP_BytesToKey.pod
+++ b/doc/crypto/EVP_BytesToKey.pod
@@ -55,7 +55,10 @@ the IV.
 
 =head1 RETURN VALUES
 
-EVP_BytesToKey() returns the size of the derived key in bytes, or 0 on error.
+If B<data> is NULL, then EVP_BytesToKey() returns the number of bytes
+needed to store the derived key.
+Otherwise, EVP_BytesToKey() returns the size of the derived key in bytes,
+or 0 on error.
 
 =head1 SEE ALSO