Add cred marshalling functions

Add a new file ccmarshal.c containing functions to marshal and
unmarshal credentials in file formats version 1-4.  These will replace
the functions in cc_file.c and cc_keyring.c, and can be used for KCM
in the future.

src/lib/krb5/ccache/Makefile.in

@@ -21,6 +21,7 @@ STLIBOBJS= \
 	cccursor.o \
 	ccdefault.o \
 	ccdefops.o \
+	ccmarshal.o \
 	ccselect.o \
 	ccselect_k5identity.o \
 	ccselect_realm.o \
@@ -37,6 +38,7 @@ OBJS=	$(OUTPRE)ccbase.$(OBJEXT) \
 	$(OUTPRE)cccursor.$(OBJEXT) \
 	$(OUTPRE)ccdefault.$(OBJEXT) \
 	$(OUTPRE)ccdefops.$(OBJEXT) \
+	$(OUTPRE)ccmarshal.$(OBJEXT) \
 	$(OUTPRE)ccselect.$(OBJEXT) \
 	$(OUTPRE)ccselect_k5identity.$(OBJEXT) \
 	$(OUTPRE)ccselect_realm.$(OBJEXT) \
@@ -53,6 +55,7 @@ SRCS=	$(srcdir)/ccbase.c \
 	$(srcdir)/cccursor.c \
 	$(srcdir)/ccdefault.c \
 	$(srcdir)/ccdefops.c \
+	$(srcdir)/ccmarshal.c \
 	$(srcdir)/ccselect.c \
 	$(srcdir)/ccselect_k5identity.c \
 	$(srcdir)/ccselect_realm.c \

src/lib/krb5/ccache/cc-int.h

@@ -131,6 +131,22 @@ krb5_error_code
 ccselect_k5identity_initvt(krb5_context context, int maj_ver, int min_ver,
                            krb5_plugin_vtable vtable);
 
+krb5_error_code
+k5_unmarshal_cred(const unsigned char *data, size_t len, int version,
+                  krb5_creds *creds);
+
+krb5_error_code
+k5_unmarshal_princ(const unsigned char *data, size_t len, int version,
+                   krb5_principal *princ_out);
+
+krb5_error_code
+k5_marshal_cred(krb5_creds *creds, int version, unsigned char **bytes_out,
+                size_t *len_out);
+
+krb5_error_code
+k5_marshal_princ(krb5_principal princ, int version, unsigned char **bytes_out,
+                 size_t *len_out);
+
 /*
  * Per-type ccache cursor.
  */