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