Remove d2i_ASN1_UINTEGER.

It is unused. It dates to an old OpenSSL DSA serialization bug.

Bug: chromium:942269
Update-Note: Removing a function.
Change-Id: Ia98f7eb1dafcd832c744387475cc13b58bc82ffe
Reviewed-on: https://boringssl-review.googlesource.com/c/boringssl/+/35324
Reviewed-by: Adam Langley <agl@google.com>

crypto/asn1/a_int.c

diff --git a/crypto/asn1/a_int.c b/crypto/asn1/a_int.c
index 6dc18ba..0522e9f 100644
--- a/crypto/asn1/a_int.c
+++ b/crypto/asn1/a_int.c
@@ -276,75 +276,6 @@
     return (NULL);
 }
 
-/*
- * This is a version of d2i_ASN1_INTEGER that ignores the sign bit of ASN1
- * integers: some broken software can encode a positive INTEGER with its MSB
- * set as negative (it doesn't add a padding zero).
- */
-
-ASN1_INTEGER *d2i_ASN1_UINTEGER(ASN1_INTEGER **a, const unsigned char **pp,
-                                long length)
-{
-    ASN1_INTEGER *ret = NULL;
-    const unsigned char *p;
-    unsigned char *s;
-    long len;
-    int inf, tag, xclass;
-    int i;
-
-    if ((a == NULL) || ((*a) == NULL)) {
-        if ((ret = M_ASN1_INTEGER_new()) == NULL)
-            return (NULL);
-        ret->type = V_ASN1_INTEGER;
-    } else
-        ret = (*a);
-
-    p = *pp;
-    inf = ASN1_get_object(&p, &len, &tag, &xclass, length);
-    if (inf & 0x80) {
-        i = ASN1_R_BAD_OBJECT_HEADER;
-        goto err;
-    }
-
-    if (tag != V_ASN1_INTEGER) {
-        i = ASN1_R_EXPECTING_AN_INTEGER;
-        goto err;
-    }
-
-    /*
-     * We must OPENSSL_malloc stuff, even for 0 bytes otherwise it signifies
-     * a missing NULL parameter.
-     */
-    s = (unsigned char *)OPENSSL_malloc((int)len + 1);
-    if (s == NULL) {
-        i = ERR_R_MALLOC_FAILURE;
-        goto err;
-    }
-    ret->type = V_ASN1_INTEGER;
-    if (len) {
-        if ((*p == 0) && (len != 1)) {
-            p++;
-            len--;
-        }
-        OPENSSL_memcpy(s, p, (int)len);
-        p += len;
-    }
-
-    if (ret->data != NULL)
-        OPENSSL_free(ret->data);
-    ret->data = s;
-    ret->length = (int)len;
-    if (a != NULL)
-        (*a) = ret;
-    *pp = p;
-    return (ret);
- err:
-    OPENSSL_PUT_ERROR(ASN1, i);
-    if ((ret != NULL) && ((a == NULL) || (*a != ret)))
-        M_ASN1_INTEGER_free(ret);
-    return (NULL);
-}
-
 int ASN1_INTEGER_set(ASN1_INTEGER *a, long v)
 {
     if (v >= 0) {

include/openssl/asn1.h

diff --git a/include/openssl/asn1.h b/include/openssl/asn1.h
index 8b61eaa..6ae831b 100644
--- a/include/openssl/asn1.h
+++ b/include/openssl/asn1.h
@@ -666,7 +666,6 @@
 DECLARE_ASN1_FUNCTIONS(ASN1_INTEGER)
 OPENSSL_EXPORT int		i2c_ASN1_INTEGER(ASN1_INTEGER *a,unsigned char **pp);
 OPENSSL_EXPORT ASN1_INTEGER *c2i_ASN1_INTEGER(ASN1_INTEGER **a,const unsigned char **pp, long length);
-OPENSSL_EXPORT ASN1_INTEGER *d2i_ASN1_UINTEGER(ASN1_INTEGER **a,const unsigned char **pp, long length);
 OPENSSL_EXPORT ASN1_INTEGER *	ASN1_INTEGER_dup(const ASN1_INTEGER *x);
 OPENSSL_EXPORT int ASN1_INTEGER_cmp(const ASN1_INTEGER *x, const ASN1_INTEGER *y);