New function ASN1_STRING_copy() to copy to an already

alloacted ASN1_STRING structure.

crypto/asn1/asn1.h

@@ -765,6 +765,7 @@ DECLARE_ASN1_SET_OF(ASN1_OBJECT)
 
 ASN1_STRING *	ASN1_STRING_new(void);
 void		ASN1_STRING_free(ASN1_STRING *a);
+int		ASN1_STRING_copy(ASN1_STRING *dst, const ASN1_STRING *str);
 ASN1_STRING *	ASN1_STRING_dup(const ASN1_STRING *a);
 ASN1_STRING *	ASN1_STRING_type_new(int type );
 int 		ASN1_STRING_cmp(const ASN1_STRING *a, const ASN1_STRING *b);

crypto/asn1/asn1_lib.c

@@ -340,20 +340,31 @@ int asn1_GetSequence(ASN1_const_CTX *c, long *length)
 	return(1);
 	}
 
+int ASN1_STRING_copy(ASN1_STRING *dst, const ASN1_STRING *str)
+	{
+	if (str == NULL)
+		return 0;
+	dst->type = str->type;
+	if (!ASN1_STRING_set(dst,str->data,str->length))
+		return 0;
+	dst->flags = str->flags;
+	return 1;
+	}
+
 ASN1_STRING *ASN1_STRING_dup(const ASN1_STRING *str)
 	{
 	ASN1_STRING *ret;
-
-	if (str == NULL) return(NULL);
-	if ((ret=ASN1_STRING_type_new(str->type)) == NULL)
-		return(NULL);
-	if (!ASN1_STRING_set(ret,str->data,str->length))
+	if (!str)
+		 return NULL;
+	ret=ASN1_STRING_new();
+	if (!ret)
+		return NULL;
+	if (!ASN1_STRING_copy(ret,str))
 		{
 		ASN1_STRING_free(ret);
-		return(NULL);
+		return NULL;
 		}
-	ret->flags = str->flags;
-	return(ret);
+	return ret;
 	}
 
 int ASN1_STRING_set(ASN1_STRING *str, const void *_data, int len)