Only allow combine_keys to work on des and 3des enctypes. It is not supported for rc4 or AES until we implement the crypto framework PRF. To generate a diff of this commit: cvs diff -r5.140 -r5.141 krb5/src/lib/crypto/ChangeLog cvs diff -r5.3 -r5.4 krb5/src/lib/crypto/combine_keys.c