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/*
* Copyright 2017-2018 The OpenSSL Project Authors. All Rights Reserved.
*
* Licensed under the OpenSSL license (the "License"). You may not use
* this file except in compliance with the License. You can obtain a copy
* in the file LICENSE in the source distribution or at
* https://www.openssl.org/source/license.html
*/
#include <stdio.h>
#include "internal/cryptlib.h"
#include "internal/numbers.h"
#include <openssl/asn1t.h>
#include <openssl/bn.h>
#include "asn1_local.h"
/*
* Custom primitive types for handling int32_t, int64_t, uint32_t, uint64_t.
* This converts between an ASN1_INTEGER and those types directly.
* This is preferred to using the LONG / ZLONG primitives.
*/
/*
* We abuse the ASN1_ITEM fields |size| as a flags field
*/
#define INTxx_FLAG_ZERO_DEFAULT (1<<0)
#define INTxx_FLAG_SIGNED (1<<1)
static int uint64_new(ASN1_VALUE **pval, const ASN1_ITEM *it)
{
if ((*pval = (ASN1_VALUE *)OPENSSL_zalloc(sizeof(uint64_t))) == NULL) {
ASN1err(ASN1_F_UINT64_NEW, ERR_R_MALLOC_FAILURE);
return 0;
}
return 1;
}
static void uint64_free(ASN1_VALUE **pval, const ASN1_ITEM *it)
{
OPENSSL_free(*pval);
*pval = NULL;
}
static void uint64_clear(ASN1_VALUE **pval, const ASN1_ITEM *it)
{
**(uint64_t **)pval = 0;
}
static int uint64_i2c(ASN1_VALUE **pval, unsigned char *cont, int *putype,
const ASN1_ITEM *it)
{
uint64_t utmp;
int neg = 0;
/* this exists to bypass broken gcc optimization */
char *cp = (char *)*pval;
/* use memcpy, because we may not be uint64_t aligned */
memcpy(&utmp, cp, sizeof(utmp));
if ((it->size & INTxx_FLAG_ZERO_DEFAULT) == INTxx_FLAG_ZERO_DEFAULT
&& utmp == 0)
return -1;
if ((it->size & INTxx_FLAG_SIGNED) == INTxx_FLAG_SIGNED
&& (int64_t)utmp < 0) {
/* i2c_uint64_int() assumes positive values */
utmp = 0 - utmp;
neg = 1;
}
return i2c_uint64_int(cont, utmp, neg);
}
static int uint64_c2i(ASN1_VALUE **pval, const unsigned char *cont, int len,
int utype, char *free_cont, const ASN1_ITEM *it)
{
uint64_t utmp = 0;
char *cp;
int neg = 0;
if (*pval == NULL && !uint64_new(pval, it))
return 0;
cp = (char *)*pval;
/*
* Strictly speaking, zero length is malformed. However, long_c2i
* (x_long.c) encodes 0 as a zero length INTEGER (wrongly, of course),
* so for the sake of backward compatibility, we still decode zero
* length INTEGERs as the number zero.
*/
if (len == 0)
goto long_compat;
if (!c2i_uint64_int(&utmp, &neg, &cont, len))
return 0;
if ((it->size & INTxx_FLAG_SIGNED) == 0 && neg) {
ASN1err(ASN1_F_UINT64_C2I, ASN1_R_ILLEGAL_NEGATIVE_VALUE);
return 0;
}
if ((it->size & INTxx_FLAG_SIGNED) == INTxx_FLAG_SIGNED
&& !neg && utmp > INT64_MAX) {
ASN1err(ASN1_F_UINT64_C2I, ASN1_R_TOO_LARGE);
return 0;
}
if (neg)
/* c2i_uint64_int() returns positive values */
utmp = 0 - utmp;
long_compat:
memcpy(cp, &utmp, sizeof(utmp));
return 1;
}
static int uint64_print(BIO *out, ASN1_VALUE **pval, const ASN1_ITEM *it,
int indent, const ASN1_PCTX *pctx)
{
if ((it->size & INTxx_FLAG_SIGNED) == INTxx_FLAG_SIGNED)
return BIO_printf(out, "%jd\n", **(int64_t **)pval);
return BIO_printf(out, "%ju\n", **(uint64_t **)pval);
}
/* 32-bit variants */
static int uint32_new(ASN1_VALUE **pval, const ASN1_ITEM *it)
{
if ((*pval = (ASN1_VALUE *)OPENSSL_zalloc(sizeof(uint32_t))) == NULL) {
ASN1err(ASN1_F_UINT32_NEW, ERR_R_MALLOC_FAILURE);
return 0;
}
return 1;
}
static void uint32_free(ASN1_VALUE **pval, const ASN1_ITEM *it)
{
OPENSSL_free(*pval);
*pval = NULL;
}
static void uint32_clear(ASN1_VALUE **pval, const ASN1_ITEM *it)
{
**(uint32_t **)pval = 0;
}
static int uint32_i2c(ASN1_VALUE **pval, unsigned char *cont, int *putype,
const ASN1_ITEM *it)
{
uint32_t utmp;
int neg = 0;
/* this exists to bypass broken gcc optimization */
char *cp = (char *)*pval;
/* use memcpy, because we may not be uint32_t aligned */
memcpy(&utmp, cp, sizeof(utmp));
if ((it->size & INTxx_FLAG_ZERO_DEFAULT) == INTxx_FLAG_ZERO_DEFAULT
&& utmp == 0)
return -1;
if ((it->size & INTxx_FLAG_SIGNED) == INTxx_FLAG_SIGNED
&& (int32_t)utmp < 0) {
/* i2c_uint64_int() assumes positive values */
utmp = 0 - utmp;
neg = 1;
}
return i2c_uint64_int(cont, (uint64_t)utmp, neg);
}
/*
* Absolute value of INT32_MIN: we can't just use -INT32_MIN as it produces
* overflow warnings.
*/
#define ABS_INT32_MIN ((uint32_t)INT32_MAX + 1)
static int uint32_c2i(ASN1_VALUE **pval, const unsigned char *cont, int len,
int utype, char *free_cont, const ASN1_ITEM *it)
{
uint64_t utmp = 0;
uint32_t utmp2 = 0;
char *cp;
int neg = 0;
if (*pval == NULL && !uint64_new(pval, it))
return 0;
cp = (char *)*pval;
/*
* Strictly speaking, zero length is malformed. However, long_c2i
* (x_long.c) encodes 0 as a zero length INTEGER (wrongly, of course),
* so for the sake of backward compatibility, we still decode zero
* length INTEGERs as the number zero.
*/
if (len == 0)
goto long_compat;
if (!c2i_uint64_int(&utmp, &neg, &cont, len))
return 0;
if ((it->size & INTxx_FLAG_SIGNED) == 0 && neg) {
ASN1err(ASN1_F_UINT32_C2I, ASN1_R_ILLEGAL_NEGATIVE_VALUE);
return 0;
}
if (neg) {
if (utmp > ABS_INT32_MIN) {
ASN1err(ASN1_F_UINT32_C2I, ASN1_R_TOO_SMALL);
return 0;
}
utmp = 0 - utmp;
} else {
if (((it->size & INTxx_FLAG_SIGNED) != 0 && utmp > INT32_MAX)
|| ((it->size & INTxx_FLAG_SIGNED) == 0 && utmp > UINT32_MAX)) {
ASN1err(ASN1_F_UINT32_C2I, ASN1_R_TOO_LARGE);
return 0;
}
}
long_compat:
utmp2 = (uint32_t)utmp;
memcpy(cp, &utmp2, sizeof(utmp2));
return 1;
}
static int uint32_print(BIO *out, ASN1_VALUE **pval, const ASN1_ITEM *it,
int indent, const ASN1_PCTX *pctx)
{
if ((it->size & INTxx_FLAG_SIGNED) == INTxx_FLAG_SIGNED)
return BIO_printf(out, "%d\n", **(int32_t **)pval);
return BIO_printf(out, "%u\n", **(uint32_t **)pval);
}
/* Define the primitives themselves */
static ASN1_PRIMITIVE_FUNCS uint32_pf = {
NULL, 0,
uint32_new,
uint32_free,
uint32_clear,
uint32_c2i,
uint32_i2c,
uint32_print
};
static ASN1_PRIMITIVE_FUNCS uint64_pf = {
NULL, 0,
uint64_new,
uint64_free,
uint64_clear,
uint64_c2i,
uint64_i2c,
uint64_print
};
ASN1_ITEM_start(INT32)
ASN1_ITYPE_PRIMITIVE, V_ASN1_INTEGER, NULL, 0, &uint32_pf,
INTxx_FLAG_SIGNED, "INT32"
ASN1_ITEM_end(INT32)
ASN1_ITEM_start(UINT32)
ASN1_ITYPE_PRIMITIVE, V_ASN1_INTEGER, NULL, 0, &uint32_pf, 0, "UINT32"
ASN1_ITEM_end(UINT32)
ASN1_ITEM_start(INT64)
ASN1_ITYPE_PRIMITIVE, V_ASN1_INTEGER, NULL, 0, &uint64_pf,
INTxx_FLAG_SIGNED, "INT64"
ASN1_ITEM_end(INT64)
ASN1_ITEM_start(UINT64)
ASN1_ITYPE_PRIMITIVE, V_ASN1_INTEGER, NULL, 0, &uint64_pf, 0, "UINT64"
ASN1_ITEM_end(UINT64)
ASN1_ITEM_start(ZINT32)
ASN1_ITYPE_PRIMITIVE, V_ASN1_INTEGER, NULL, 0, &uint32_pf,
INTxx_FLAG_ZERO_DEFAULT|INTxx_FLAG_SIGNED, "ZINT32"
ASN1_ITEM_end(ZINT32)
ASN1_ITEM_start(ZUINT32)
ASN1_ITYPE_PRIMITIVE, V_ASN1_INTEGER, NULL, 0, &uint32_pf,
INTxx_FLAG_ZERO_DEFAULT, "ZUINT32"
ASN1_ITEM_end(ZUINT32)
ASN1_ITEM_start(ZINT64)
ASN1_ITYPE_PRIMITIVE, V_ASN1_INTEGER, NULL, 0, &uint64_pf,
INTxx_FLAG_ZERO_DEFAULT|INTxx_FLAG_SIGNED, "ZINT64"
ASN1_ITEM_end(ZINT64)
ASN1_ITEM_start(ZUINT64)
ASN1_ITYPE_PRIMITIVE, V_ASN1_INTEGER, NULL, 0, &uint64_pf,
INTxx_FLAG_ZERO_DEFAULT, "ZUINT64"
ASN1_ITEM_end(ZUINT64)
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