Unwind ASN1_PRIMITIVE_FUNCS.

This was used to register custom primitive types, namely some INTEGER
variations. We have since removed them all.

Change-Id: Id3f5b15058bc3be1cef5e0f989d2e7e6db392712
Reviewed-on: https://boringssl-review.googlesource.com/c/boringssl/+/43891
Reviewed-by: Adam Langley <agl@google.com>

crypto/asn1/tasn_dec.c

diff --git a/crypto/asn1/tasn_dec.c b/crypto/asn1/tasn_dec.c
index 1512bfc..ecedd3b 100644
--- a/crypto/asn1/tasn_dec.c
+++ b/crypto/asn1/tasn_dec.c
@@ -797,12 +797,12 @@
     ASN1_STRING *stmp;
     ASN1_TYPE *typ = NULL;
     int ret = 0;
-    const ASN1_PRIMITIVE_FUNCS *pf;
     ASN1_INTEGER **tint;
-    pf = it->funcs;
 
-    if (pf && pf->prim_c2i)
-        return pf->prim_c2i(pval, cont, len, utype, free_cont, it);
+    /* Historically, |it->funcs| for primitive types contained an
+     * |ASN1_PRIMITIVE_FUNCS| table of callbacks. */
+    assert(it->funcs == NULL);
+
     /* If ANY type clear type and set pointer to internal value */
     if (it->utype == V_ASN1_ANY) {
         if (!*pval) {

crypto/asn1/tasn_enc.c

diff --git a/crypto/asn1/tasn_enc.c b/crypto/asn1/tasn_enc.c
index c02f3c5..5ef1828 100644
--- a/crypto/asn1/tasn_enc.c
+++ b/crypto/asn1/tasn_enc.c
@@ -496,10 +496,10 @@
     const unsigned char *cont;
     unsigned char c;
     int len;
-    const ASN1_PRIMITIVE_FUNCS *pf;
-    pf = it->funcs;
-    if (pf && pf->prim_i2c)
-        return pf->prim_i2c(pval, cout, putype, it);
+
+    /* Historically, |it->funcs| for primitive types contained an
+     * |ASN1_PRIMITIVE_FUNCS| table of callbacks. */
+    assert(it->funcs == NULL);
 
     /* Should type be omitted? */
     if ((it->itype != ASN1_ITYPE_PRIMITIVE)

crypto/asn1/tasn_fre.c

diff --git a/crypto/asn1/tasn_fre.c b/crypto/asn1/tasn_fre.c
index 78d6626..a1e7315 100644
--- a/crypto/asn1/tasn_fre.c
+++ b/crypto/asn1/tasn_fre.c
@@ -56,6 +56,8 @@
 
 #include <openssl/asn1.h>
 
+#include <assert.h>
+
 #include <openssl/asn1t.h>
 #include <openssl/mem.h>
 
@@ -182,14 +184,9 @@
 void ASN1_primitive_free(ASN1_VALUE **pval, const ASN1_ITEM *it)
 {
     int utype;
-    if (it) {
-        const ASN1_PRIMITIVE_FUNCS *pf;
-        pf = it->funcs;
-        if (pf && pf->prim_free) {
-            pf->prim_free(pval, it);
-            return;
-        }
-    }
+    /* Historically, |it->funcs| for primitive types contained an
+     * |ASN1_PRIMITIVE_FUNCS| table of calbacks. */
+    assert(it == NULL || it->funcs == NULL);
     /* Special case: if 'it' is NULL free contents of ASN1_TYPE */
     if (!it) {
         ASN1_TYPE *typ = (ASN1_TYPE *)*pval;

crypto/asn1/tasn_new.c

diff --git a/crypto/asn1/tasn_new.c b/crypto/asn1/tasn_new.c
index 139a044..3e8beb7 100644
--- a/crypto/asn1/tasn_new.c
+++ b/crypto/asn1/tasn_new.c
@@ -308,11 +308,9 @@
     if (!it)
         return 0;
 
-    if (it->funcs) {
-        const ASN1_PRIMITIVE_FUNCS *pf = it->funcs;
-        if (pf->prim_new)
-            return pf->prim_new(pval, it);
-    }
+    /* Historically, |it->funcs| for primitive types contained an
+     * |ASN1_PRIMITIVE_FUNCS| table of calbacks. */
+    assert(it->funcs == NULL);
 
     if (it->itype == ASN1_ITYPE_MSTRING)
         utype = -1;
@@ -355,14 +353,9 @@
 static void asn1_primitive_clear(ASN1_VALUE **pval, const ASN1_ITEM *it)
 {
     int utype;
-    if (it && it->funcs) {
-        const ASN1_PRIMITIVE_FUNCS *pf = it->funcs;
-        if (pf->prim_clear)
-            pf->prim_clear(pval, it);
-        else
-            *pval = NULL;
-        return;
-    }
+    /* Historically, |it->funcs| for primitive types contained an
+     * |ASN1_PRIMITIVE_FUNCS| table of calbacks. */
+    assert(it == NULL || it->funcs == NULL);
     if (!it || (it->itype == ASN1_ITYPE_MSTRING))
         utype = -1;
     else

include/openssl/asn1t.h

diff --git a/include/openssl/asn1t.h b/include/openssl/asn1t.h
index 0af1195..deea9ec 100644
--- a/include/openssl/asn1t.h
+++ b/include/openssl/asn1t.h
@@ -552,10 +552,6 @@
 						int indent, const char *fname, 
 						const ASN1_PCTX *pctx);
 
-typedef int ASN1_primitive_i2c(ASN1_VALUE **pval, unsigned char *cont, int *putype, const ASN1_ITEM *it);
-typedef int ASN1_primitive_c2i(ASN1_VALUE **pval, const unsigned char *cont, int len, int utype, char *free_cont, const ASN1_ITEM *it);
-typedef int ASN1_primitive_print(BIO *out, ASN1_VALUE **pval, const ASN1_ITEM *it, int indent, const ASN1_PCTX *pctx);
-
 typedef struct ASN1_EXTERN_FUNCS_st {
 	void *app_data;
 	ASN1_ex_new_func *asn1_ex_new;
@@ -567,17 +563,6 @@
 	ASN1_ex_print_func *asn1_ex_print;
 } ASN1_EXTERN_FUNCS;
 
-typedef struct ASN1_PRIMITIVE_FUNCS_st {
-	void *app_data;
-	unsigned long flags;
-	ASN1_ex_new_func *prim_new;
-	ASN1_ex_free_func *prim_free;
-	ASN1_ex_free_func *prim_clear;
-	ASN1_primitive_c2i *prim_c2i;
-	ASN1_primitive_i2c *prim_i2c;
-	ASN1_primitive_print *prim_print;
-} ASN1_PRIMITIVE_FUNCS;
-
 /* This is the ASN1_AUX structure: it handles various
  * miscellaneous requirements. For example the use of
  * reference counts and an informational callback.