Constify some input buffers in asn1

Reviewed-by: NKurt Roeckx <kurt@openssl.org>
Reviewed-by: NRich Salz <rsalz@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/1215)

crypto/asn1/asn_moid.c

@@ -18,7 +18,7 @@
 
 /* Simple ASN1 OID module: add all objects in a given section */
 
-static int do_create(char *value, char *name);
+static int do_create(const char *value, const char *name);
 
 static int oid_module_init(CONF_IMODULE *md, const CONF *cnf)
 {
@@ -57,11 +57,12 @@ void ASN1_add_oid_module(void)
  * shortname = some long name, 1.2.3.4
  */
 
-static int do_create(char *value, char *name)
+static int do_create(const char *value, const char *name)
 {
     int nid;
     ASN1_OBJECT *oid;
-    char *ln, *ostr, *p, *lntmp;
+    const char *ln, *ostr, *p;
+    char *lntmp;
     p = strrchr(value, ',');
     if (!p) {
         ln = name;

crypto/asn1/asn_mstbl.c

@@ -16,7 +16,7 @@
 
 /* Multi string module: add table entries from a given section */
 
-static int do_tcreate(char *value, char *name);
+static int do_tcreate(const char *value, const char *name);
 
 static int stbl_module_init(CONF_IMODULE *md, const CONF *cnf)
 {
@@ -55,7 +55,7 @@ void ASN1_add_stable_module(void)
  * n1:v1, n2:v2,... where name is "min", "max", "mask" or "flags".
  */
 
-static int do_tcreate(char *value, char *name)
+static int do_tcreate(const char *value, const char *name)
 {
     char *eptr;
     int nid, i, rv = 0;

crypto/asn1/t_bitst.c

@@ -30,7 +30,7 @@ int ASN1_BIT_STRING_name_print(BIO *out, ASN1_BIT_STRING *bs,
     return 1;
 }
 
-int ASN1_BIT_STRING_set_asc(ASN1_BIT_STRING *bs, char *name, int value,
+int ASN1_BIT_STRING_set_asc(ASN1_BIT_STRING *bs, const char *name, int value,
                             BIT_STRING_BITNAME *tbl)
 {
     int bitnum;
@@ -44,7 +44,7 @@ int ASN1_BIT_STRING_set_asc(ASN1_BIT_STRING *bs, char *name, int value,
     return 1;
 }
 
-int ASN1_BIT_STRING_num_asc(char *name, BIT_STRING_BITNAME *tbl)
+int ASN1_BIT_STRING_num_asc(const char *name, BIT_STRING_BITNAME *tbl)
 {
     BIT_STRING_BITNAME *bnam;
     for (bnam = tbl; bnam->lname; bnam++) {

include/openssl/asn1.h

@@ -553,8 +553,8 @@ int ASN1_BIT_STRING_check(const ASN1_BIT_STRING *a,
 
 int ASN1_BIT_STRING_name_print(BIO *out, ASN1_BIT_STRING *bs,
                                BIT_STRING_BITNAME *tbl, int indent);
-int ASN1_BIT_STRING_num_asc(char *name, BIT_STRING_BITNAME *tbl);
-int ASN1_BIT_STRING_set_asc(ASN1_BIT_STRING *bs, char *name, int value,
+int ASN1_BIT_STRING_num_asc(const char *name, BIT_STRING_BITNAME *tbl);
+int ASN1_BIT_STRING_set_asc(ASN1_BIT_STRING *bs, const char *name, int value,
                             BIT_STRING_BITNAME *tbl);
 
 DECLARE_ASN1_FUNCTIONS(ASN1_INTEGER)