diff --git a/crypto/asn1/a_d2i_fp.c b/crypto/asn1/a_d2i_fp.c
index 40baeb16a..1356a0a26 100644
--- a/crypto/asn1/a_d2i_fp.c
+++ b/crypto/asn1/a_d2i_fp.c
@@ -66,9 +66,7 @@ static int asn1_d2i_read_bio(BIO *in, BUF_MEM **pb);
 #ifndef NO_OLD_ASN1
 #ifndef OPENSSL_NO_FP_API
 
-void *ASN1_d2i_fp(void *(*xnew)(void),
-		  void *(*d2i)(void **,const unsigned char **,long), FILE *in,
-		  void **x)
+void *ASN1_d2i_fp(void *(*xnew)(void), d2i_of_void *d2i, FILE *in, void **x)
         {
         BIO *b;
         void *ret;
@@ -85,9 +83,7 @@ void *ASN1_d2i_fp(void *(*xnew)(void),
         }
 #endif
 
-char *ASN1_d2i_bio(void *(*xnew)(void),
-		   void *(*d2i)(void **,const unsigned char **,long), BIO *in,
-		   void **x)
+void *ASN1_d2i_bio(void *(*xnew)(void), d2i_of_void *d2i, BIO *in, void **x)
 	{
 	BUF_MEM *b = NULL;
 	const unsigned char *p;
diff --git a/crypto/asn1/a_dup.c b/crypto/asn1/a_dup.c
index 867926337..09f5f7ad8 100644
--- a/crypto/asn1/a_dup.c
+++ b/crypto/asn1/a_dup.c
@@ -62,23 +62,23 @@
 
 #ifndef NO_OLD_ASN1
 
-void *ASN1_dup(int (*i2d)(char *,void *), 
-	       char *(*d2i)(void *,unsigned char **,long), char *x)
+void *ASN1_dup(i2d_of_void *i2d, d2i_of_void *d2i, char *x)
 	{
 	unsigned char *b,*p;
-	long i;
+	const unsigned char *p2;
+	int i;
 	char *ret;
 
 	if (x == NULL) return(NULL);
 
-	i=(long)i2d(x,NULL);
-	b=(unsigned char *)OPENSSL_malloc((unsigned int)i+10);
+	i=i2d(x,NULL);
+	b=OPENSSL_malloc(i+10);
 	if (b == NULL)
 		{ ASN1err(ASN1_F_ASN1_DUP,ERR_R_MALLOC_FAILURE); return(NULL); }
 	p= b;
 	i=i2d(x,&p);
-	p= b;
-	ret=d2i(NULL,&p,i);
+	p2= b;
+	ret=d2i(NULL,&p2,i);
 	OPENSSL_free(b);
 	return(ret);
 	}
diff --git a/crypto/asn1/a_i2d_fp.c b/crypto/asn1/a_i2d_fp.c
index 159c05097..925897c82 100644
--- a/crypto/asn1/a_i2d_fp.c
+++ b/crypto/asn1/a_i2d_fp.c
@@ -64,8 +64,7 @@
 #ifndef NO_OLD_ASN1
 
 #ifndef OPENSSL_NO_FP_API
-int ASN1_i2d_fp(int (*i2d)(void *, unsigned char **), FILE *out,
-		void *x)
+int ASN1_i2d_fp(i2d_of_void *i2d, FILE *out, void *x)
         {
         BIO *b;
         int ret;
@@ -82,8 +81,7 @@ int ASN1_i2d_fp(int (*i2d)(void *, unsigned char **), FILE *out,
         }
 #endif
 
-int ASN1_i2d_bio(int (*i2d)(void *, unsigned char **), BIO *out,
-		 unsigned char *x)
+int ASN1_i2d_bio(i2d_of_void *i2d, BIO *out, unsigned char *x)
 	{
 	char *b;
 	unsigned char *p;
diff --git a/crypto/asn1/a_set.c b/crypto/asn1/a_set.c
index 921871975..958558c20 100644
--- a/crypto/asn1/a_set.c
+++ b/crypto/asn1/a_set.c
@@ -85,8 +85,8 @@ static int SetBlobCmp(const void *elem1, const void *elem2 )
     }
 
 /* int is_set:  if TRUE, then sort the contents (i.e. it isn't a SEQUENCE)    */
-int i2d_ASN1_SET(STACK *a, unsigned char **pp, int (*func)(void *,unsigned char **), int ex_tag,
-	     int ex_class, int is_set)
+int i2d_ASN1_SET(STACK *a, unsigned char **pp, i2d_of_void *i2d, int ex_tag,
+		 int ex_class, int is_set)
 	{
 	int ret=0,r;
 	int i;
@@ -97,7 +97,7 @@ int i2d_ASN1_SET(STACK *a, unsigned char **pp, int (*func)(void *,unsigned char
 
 	if (a == NULL) return(0);
 	for (i=sk_num(a)-1; i>=0; i--)
-		ret+=func(sk_value(a,i),NULL);
+		ret+=i2d(sk_value(a,i),NULL);
 	r=ASN1_object_size(1,ret,ex_tag);
 	if (pp == NULL) return(r);
 
@@ -111,7 +111,7 @@ int i2d_ASN1_SET(STACK *a, unsigned char **pp, int (*func)(void *,unsigned char
 	if(!is_set || (sk_num(a) < 2))
 		{
 		for (i=0; i<sk_num(a); i++)
-                	func(sk_value(a,i),&p);
+                	i2d(sk_value(a,i),&p);
 
 		*pp=p;
 		return(r);
@@ -129,7 +129,7 @@ int i2d_ASN1_SET(STACK *a, unsigned char **pp, int (*func)(void *,unsigned char
         for (i=0; i<sk_num(a); i++)
 	        {
                 rgSetBlob[i].pbData = p;  /* catch each set encode blob */
-                func(sk_value(a,i),&p);
+                i2d(sk_value(a,i),&p);
                 rgSetBlob[i].cbData = p - rgSetBlob[i].pbData; /* Length of this
 SetBlob
 */
@@ -163,8 +163,8 @@ SetBlob
         }
 
 STACK *d2i_ASN1_SET(STACK **a, const unsigned char **pp, long length,
-		    char *(*d2i)(void **,const unsigned char **,long),
-		    void (*free_func)(void *), int ex_tag, int ex_class)
+		    d2i_of_void *d2i, void (*free_func)(void *), int ex_tag,
+		    int ex_class)
 	{
 	ASN1_const_CTX c;
 	STACK *ret=NULL;
diff --git a/crypto/asn1/asn1.h b/crypto/asn1/asn1.h
index a4ec44219..bc13f830e 100644
--- a/crypto/asn1/asn1.h
+++ b/crypto/asn1/asn1.h
@@ -321,6 +321,12 @@ typedef struct ASN1_VALUE_st ASN1_VALUE;
 #define I2D_OF(type) int (*)(type *,unsigned char **)
 #define I2D_OF_const(type) int (*)(const type *,unsigned char **)
 
+#define TYPEDEF_D2I_OF(type) typedef type *d2i_of_##type(type **,const unsigned char **,long)
+#define TYPEDEF_I2D_OF(type) typedef int i2d_of_##type(type *,unsigned char **)
+#define TYPEDEF_D2I2D_OF(type) TYPEDEF_D2I_OF(type); TYPEDEF_I2D_OF(type)
+
+TYPEDEF_D2I2D_OF(void);
+
 /* The following macros and typedefs allow an ASN1_ITEM
  * to be embedded in a structure and referenced. Since
  * the ASN1_ITEM pointers need to be globally accessible
@@ -512,8 +518,8 @@ DECLARE_ASN1_SET_OF(ASN1_TYPE)
 
 typedef struct asn1_method_st
 	{
-	int (*i2d)(void *, unsigned char **);
-	void *(*d2i)(void **,const unsigned char **,long);
+	i2d_of_void *i2d;
+	d2i_of_void *d2i;
 	void *(*create)(void);
 	void (*destroy)(void *);
 	} ASN1_METHOD;
@@ -836,11 +842,9 @@ int ASN1_TIME_check(ASN1_TIME *t);
 ASN1_GENERALIZEDTIME *ASN1_TIME_to_generalizedtime(ASN1_TIME *t, ASN1_GENERALIZEDTIME **out);
 
 int i2d_ASN1_SET(STACK *a, unsigned char **pp,
-		 int (*func)(void *,unsigned char **), int ex_tag, int ex_class,
-		 int is_set);
+		 i2d_of_void *i2d, int ex_tag, int ex_class, int is_set);
 STACK *	d2i_ASN1_SET(STACK **a, const unsigned char **pp, long length,
-		     char *(*func)(void **,const unsigned char **,long),
-		     void (*free_func)(void *),
+		     d2i_of_void *d2i, void (*free_func)(void *),
 		     int ex_tag, int ex_class);
 
 #ifndef OPENSSL_NO_BIO
@@ -895,8 +899,7 @@ int ASN1_put_eoc(unsigned char **pp);
 int ASN1_object_size(int constructed, int length, int tag);
 
 /* Used to implement other functions */
-void *ASN1_dup(int (*i2d)(char *,void *), 
-	       char *(*d2i)(void *,unsigned char **,long), char *x);
+void *ASN1_dup(i2d_of_void *i2d, d2i_of_void *d2i, char *x);
 #define ASN1_dup_of(type,i2d,d2i,x) \
 	((type *(*)(I2D_OF(type),D2I_OF(type),type *))ASN1_dup)(i2d,d2i,x)
 #define ASN1_dup_of_const(type,i2d,d2i,x) \
@@ -905,14 +908,11 @@ void *ASN1_dup(int (*i2d)(char *,void *),
 void *ASN1_item_dup(const ASN1_ITEM *it, void *x);
 
 #ifndef OPENSSL_NO_FP_API
-void *ASN1_d2i_fp(void *(*xnew)(void),
-		  void *(*d2i)(void **,const unsigned char **,long), FILE *in,
-		  void **x);
+void *ASN1_d2i_fp(void *(*xnew)(void), d2i_of_void *d2i, FILE *in, void **x);
 #define ASN1_d2i_fp_of(type,xnew,d2i,in,x) \
 	((type *(*)(type *(*)(void),D2I_OF(type),FILE *,type **))ASN1_d2i_fp)(xnew,d2i,in,x)
 void *ASN1_item_d2i_fp(const ASN1_ITEM *it, FILE *in, void *x);
-int ASN1_i2d_fp(int (*i2d)(void *, unsigned char **),FILE *out,
-		void *x);
+int ASN1_i2d_fp(i2d_of_void *i2d,FILE *out,void *x);
 #define ASN1_i2d_fp_of(type,i2d,out,x) \
 	((int (*)(I2D_OF(type),FILE *,type *))ASN1_i2d_fp)(i2d,out,x)
 #define ASN1_i2d_fp_of_const(type,i2d,out,x) \
@@ -924,17 +924,11 @@ int ASN1_STRING_print_ex_fp(FILE *fp, ASN1_STRING *str, unsigned long flags);
 int ASN1_STRING_to_UTF8(unsigned char **out, ASN1_STRING *in);
 
 #ifndef OPENSSL_NO_BIO
-char *ASN1_d2i_bio(void *(*xnew)(void),
-		   void *(*d2i)(void **,const unsigned char **,long), BIO *in,
-		   void **x);
+void *ASN1_d2i_bio(void *(*xnew)(void), d2i_of_void *d2i, BIO *in, void **x);
 #define ASN1_d2i_bio_of(type,xnew,d2i,in,x) \
 	((type *(*)(type *(*)(void),D2I_OF(type),BIO *,type **))ASN1_d2i_bio)(xnew,d2i,in,x)
-char *ASN1_d2i_bio(void *(*xnew)(void),
-		   void *(*d2i)(void **,const unsigned char **,long), BIO *in,
-		   void **x);
 void *ASN1_item_d2i_bio(const ASN1_ITEM *it, BIO *in, void *x);
-int ASN1_i2d_bio(int (*i2d)(void *, unsigned char **),BIO *out,
-		 unsigned char *x);
+int ASN1_i2d_bio(i2d_of_void *i2d,BIO *out, unsigned char *x);
 #define ASN1_i2d_bio_of(type,i2d,out,x) \
 	((int (*)(I2D_OF(type),BIO *,type *))ASN1_i2d_bio)(i2d,out,x)
 #define ASN1_i2d_bio_of_const(type,i2d,out,x) \
@@ -974,15 +968,12 @@ int ASN1_TYPE_get_int_octetstring(ASN1_TYPE *a,long *num,
 	unsigned char *data, int max_len);
 
 STACK *ASN1_seq_unpack(const unsigned char *buf, int len,
-		       char *(*d2i)(void **,const unsigned char **,long),
-		       void (*free_func)(void *));
-unsigned char *ASN1_seq_pack(STACK *safes,
-			     int (*i2d)(void *, unsigned char **),
+		       d2i_of_void *d2i, void (*free_func)(void *));
+unsigned char *ASN1_seq_pack(STACK *safes, i2d_of_void *i2d,
 			     unsigned char **buf, int *len );
-void *ASN1_unpack_string(ASN1_STRING *oct,
-			 void *(*d2i)(void *,const unsigned char **,long));
+void *ASN1_unpack_string(ASN1_STRING *oct, d2i_of_void *d2i);
 void *ASN1_item_unpack(ASN1_STRING *oct, const ASN1_ITEM *it);
-ASN1_STRING *ASN1_pack_string(void *obj, int (*i2d)(void *, unsigned char **),
+ASN1_STRING *ASN1_pack_string(void *obj, i2d_of_void *i2d,
 			      ASN1_OCTET_STRING **oct);
 #define ASN1_pack_string_of(type,obj,i2d,oct) \
 	((ASN1_STRING *(*)(type *,I2D_OF(type),ASN1_OCTET_STRING **))ASN1_pack_string)(obj,i2d,oct)
diff --git a/crypto/asn1/asn_pack.c b/crypto/asn1/asn_pack.c
index e3535bc43..7421e69ae 100644
--- a/crypto/asn1/asn_pack.c
+++ b/crypto/asn1/asn_pack.c
@@ -67,8 +67,7 @@
 /* Turn an ASN1 encoded SEQUENCE OF into a STACK of structures */
 
 STACK *ASN1_seq_unpack(const unsigned char *buf, int len,
-		       char *(*d2i)(void **,const unsigned char **,long),
-		       void (*free_func)(void *))
+		       d2i_of_void *d2i,void (*free_func)(void *))
 {
     STACK *sk;
     const unsigned char *pbuf;
@@ -107,8 +106,7 @@ unsigned char *ASN1_seq_pack(STACK *safes, int (*i2d)(void *,unsigned char **),
 
 /* Extract an ASN1 object from an ASN1_STRING */
 
-void *ASN1_unpack_string (ASN1_STRING *oct,
-			  void *(*d2i)(void *,const unsigned char **,long))
+void *ASN1_unpack_string (ASN1_STRING *oct, d2i_of_void *d2i)
 {
 	const unsigned char *p;
 	char *ret;