* arcfour.c (krb5_arcfour_decrypt): Return error if salt cannot be allocated

	* arcfour.c (krb5_arcfour_decrypt): Return error if salt cannot be allocated
	(krb5_arcfour_encrypt): Only memset bits of key to known value
on export-grade crypto
	* arcfour.c (arcfour_translate_usage): Attempt to implement based
	on draft-brezak-win2k-krb-rc4-hmac-03.  Several usages remain unclear.
	Make 40-bit string not unsigned to avoid warning
	(krb5_arcfour_encrypt krb5_arcfour_decrypt):  cast to avoid
pointer warnings

git-svn-id: svn://anonsvn.mit.edu/krb5/trunk@13824 dc483132-0cff-0310-8789-dd5450dbe970