ref: 8bc69a872883224675a55db51ac8f60ab5ed9e5a
dir: /third_party/boringssl/src/crypto/asn1/asn1_lib.c/
/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
* All rights reserved.
*
* This package is an SSL implementation written
* by Eric Young (eay@cryptsoft.com).
* The implementation was written so as to conform with Netscapes SSL.
*
* This library is free for commercial and non-commercial use as long as
* the following conditions are aheared to. The following conditions
* apply to all code found in this distribution, be it the RC4, RSA,
* lhash, DES, etc., code; not just the SSL code. The SSL documentation
* included with this distribution is covered by the same copyright terms
* except that the holder is Tim Hudson (tjh@cryptsoft.com).
*
* Copyright remains Eric Young's, and as such any Copyright notices in
* the code are not to be removed.
* If this package is used in a product, Eric Young should be given attribution
* as the author of the parts of the library used.
* This can be in the form of a textual message at program startup or
* in documentation (online or textual) provided with the package.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* "This product includes cryptographic software written by
* Eric Young (eay@cryptsoft.com)"
* The word 'cryptographic' can be left out if the rouines from the library
* being used are not cryptographic related :-).
* 4. If you include any Windows specific code (or a derivative thereof) from
* the apps directory (application code) you must include an acknowledgement:
* "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
*
* THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* The licence and distribution terms for any publically available version or
* derivative of this code cannot be changed. i.e. this code cannot simply be
* copied and put under another distribution licence
* [including the GNU Public Licence.] */
#include <openssl/asn1.h>
#include <limits.h>
#include <string.h>
#include <openssl/asn1_mac.h>
#include <openssl/err.h>
#include <openssl/mem.h>
#include "../internal.h"
#include "internal.h"
/* Cross-module errors from crypto/x509/i2d_pr.c. */
OPENSSL_DECLARE_ERROR_REASON(ASN1, UNSUPPORTED_PUBLIC_KEY_TYPE)
/* Cross-module errors from crypto/x509/algorithm.c. */
OPENSSL_DECLARE_ERROR_REASON(ASN1, CONTEXT_NOT_INITIALISED)
OPENSSL_DECLARE_ERROR_REASON(ASN1, DIGEST_AND_KEY_TYPE_NOT_SUPPORTED)
OPENSSL_DECLARE_ERROR_REASON(ASN1, UNKNOWN_MESSAGE_DIGEST_ALGORITHM)
OPENSSL_DECLARE_ERROR_REASON(ASN1, UNKNOWN_SIGNATURE_ALGORITHM)
OPENSSL_DECLARE_ERROR_REASON(ASN1, WRONG_PUBLIC_KEY_TYPE)
/*
* Cross-module errors from crypto/x509/asn1_gen.c. TODO(davidben): Remove
* these once asn1_gen.c is gone.
*/
OPENSSL_DECLARE_ERROR_REASON(ASN1, DEPTH_EXCEEDED)
OPENSSL_DECLARE_ERROR_REASON(ASN1, ILLEGAL_BITSTRING_FORMAT)
OPENSSL_DECLARE_ERROR_REASON(ASN1, ILLEGAL_BOOLEAN)
OPENSSL_DECLARE_ERROR_REASON(ASN1, ILLEGAL_FORMAT)
OPENSSL_DECLARE_ERROR_REASON(ASN1, ILLEGAL_HEX)
OPENSSL_DECLARE_ERROR_REASON(ASN1, ILLEGAL_IMPLICIT_TAG)
OPENSSL_DECLARE_ERROR_REASON(ASN1, ILLEGAL_INTEGER)
OPENSSL_DECLARE_ERROR_REASON(ASN1, ILLEGAL_NESTED_TAGGING)
OPENSSL_DECLARE_ERROR_REASON(ASN1, ILLEGAL_NULL_VALUE)
OPENSSL_DECLARE_ERROR_REASON(ASN1, ILLEGAL_OBJECT)
OPENSSL_DECLARE_ERROR_REASON(ASN1, ILLEGAL_TIME_VALUE)
OPENSSL_DECLARE_ERROR_REASON(ASN1, INTEGER_NOT_ASCII_FORMAT)
OPENSSL_DECLARE_ERROR_REASON(ASN1, INVALID_MODIFIER)
OPENSSL_DECLARE_ERROR_REASON(ASN1, INVALID_NUMBER)
OPENSSL_DECLARE_ERROR_REASON(ASN1, LIST_ERROR)
OPENSSL_DECLARE_ERROR_REASON(ASN1, MISSING_VALUE)
OPENSSL_DECLARE_ERROR_REASON(ASN1, NOT_ASCII_FORMAT)
OPENSSL_DECLARE_ERROR_REASON(ASN1, OBJECT_NOT_ASCII_FORMAT)
OPENSSL_DECLARE_ERROR_REASON(ASN1, SEQUENCE_OR_SET_NEEDS_CONFIG)
OPENSSL_DECLARE_ERROR_REASON(ASN1, TIME_NOT_ASCII_FORMAT)
OPENSSL_DECLARE_ERROR_REASON(ASN1, UNKNOWN_FORMAT)
OPENSSL_DECLARE_ERROR_REASON(ASN1, UNKNOWN_TAG)
OPENSSL_DECLARE_ERROR_REASON(ASN1, UNSUPPORTED_TYPE)
static int asn1_get_length(const unsigned char **pp, long *rl, long max);
static void asn1_put_length(unsigned char **pp, int length);
int ASN1_get_object(const unsigned char **pp, long *plength, int *ptag,
int *pclass, long omax)
{
int i, ret;
long l;
const unsigned char *p = *pp;
int tag, xclass;
long max = omax;
if (!max)
goto err;
ret = (*p & V_ASN1_CONSTRUCTED);
xclass = (*p & V_ASN1_PRIVATE);
i = *p & V_ASN1_PRIMITIVE_TAG;
if (i == V_ASN1_PRIMITIVE_TAG) { /* high-tag */
p++;
if (--max == 0)
goto err;
l = 0;
while (*p & 0x80) {
l <<= 7L;
l |= *(p++) & 0x7f;
if (--max == 0)
goto err;
if (l > (INT_MAX >> 7L))
goto err;
}
l <<= 7L;
l |= *(p++) & 0x7f;
tag = (int)l;
if (--max == 0)
goto err;
} else {
tag = i;
p++;
if (--max == 0)
goto err;
}
/* To avoid ambiguity with V_ASN1_NEG, impose a limit on universal tags. */
if (xclass == V_ASN1_UNIVERSAL && tag > V_ASN1_MAX_UNIVERSAL)
goto err;
*ptag = tag;
*pclass = xclass;
if (!asn1_get_length(&p, plength, max))
goto err;
if (*plength > (omax - (p - *pp))) {
OPENSSL_PUT_ERROR(ASN1, ASN1_R_TOO_LONG);
return 0x80;
}
*pp = p;
return ret;
err:
OPENSSL_PUT_ERROR(ASN1, ASN1_R_HEADER_TOO_LONG);
return 0x80;
}
static int asn1_get_length(const unsigned char **pp, long *rl, long max)
{
const unsigned char *p = *pp;
unsigned long ret = 0;
unsigned long i;
if (max-- < 1) {
return 0;
}
if (*p == 0x80) {
/* We do not support BER indefinite-length encoding. */
return 0;
}
i = *p & 0x7f;
if (*(p++) & 0x80) {
if (i > sizeof(ret) || max < (long)i)
return 0;
while (i-- > 0) {
ret <<= 8L;
ret |= *(p++);
}
} else {
ret = i;
}
/*
* Bound the length to comfortably fit in an int. Lengths in this module
* often switch between int and long without overflow checks.
*/
if (ret > INT_MAX / 2)
return 0;
*pp = p;
*rl = (long)ret;
return 1;
}
/*
* class 0 is constructed constructed == 2 for indefinite length constructed
*/
void ASN1_put_object(unsigned char **pp, int constructed, int length, int tag,
int xclass)
{
unsigned char *p = *pp;
int i, ttag;
i = (constructed) ? V_ASN1_CONSTRUCTED : 0;
i |= (xclass & V_ASN1_PRIVATE);
if (tag < 31)
*(p++) = i | (tag & V_ASN1_PRIMITIVE_TAG);
else {
*(p++) = i | V_ASN1_PRIMITIVE_TAG;
for (i = 0, ttag = tag; ttag > 0; i++)
ttag >>= 7;
ttag = i;
while (i-- > 0) {
p[i] = tag & 0x7f;
if (i != (ttag - 1))
p[i] |= 0x80;
tag >>= 7;
}
p += ttag;
}
if (constructed == 2)
*(p++) = 0x80;
else
asn1_put_length(&p, length);
*pp = p;
}
int ASN1_put_eoc(unsigned char **pp)
{
/* This function is no longer used in the library, but some external code
* uses it. */
unsigned char *p = *pp;
*p++ = 0;
*p++ = 0;
*pp = p;
return 2;
}
static void asn1_put_length(unsigned char **pp, int length)
{
unsigned char *p = *pp;
int i, l;
if (length <= 127)
*(p++) = (unsigned char)length;
else {
l = length;
for (i = 0; l > 0; i++)
l >>= 8;
*(p++) = i | 0x80;
l = i;
while (i-- > 0) {
p[i] = length & 0xff;
length >>= 8;
}
p += l;
}
*pp = p;
}
int ASN1_object_size(int constructed, int length, int tag)
{
int ret = 1;
if (length < 0)
return -1;
if (tag >= 31) {
while (tag > 0) {
tag >>= 7;
ret++;
}
}
if (constructed == 2) {
ret += 3;
} else {
ret++;
if (length > 127) {
int tmplen = length;
while (tmplen > 0) {
tmplen >>= 8;
ret++;
}
}
}
if (ret >= INT_MAX - length)
return -1;
return ret + length;
}
int ASN1_STRING_copy(ASN1_STRING *dst, const ASN1_STRING *str)
{
if (str == NULL)
return 0;
if (!ASN1_STRING_set(dst, str->data, str->length))
return 0;
dst->type = str->type;
dst->flags = str->flags;
return 1;
}
ASN1_STRING *ASN1_STRING_dup(const ASN1_STRING *str)
{
ASN1_STRING *ret;
if (!str)
return NULL;
ret = ASN1_STRING_new();
if (!ret)
return NULL;
if (!ASN1_STRING_copy(ret, str)) {
ASN1_STRING_free(ret);
return NULL;
}
return ret;
}
int ASN1_STRING_set(ASN1_STRING *str, const void *_data, int len)
{
unsigned char *c;
const char *data = _data;
if (len < 0) {
if (data == NULL)
return (0);
else
len = strlen(data);
}
if ((str->length <= len) || (str->data == NULL)) {
c = str->data;
if (c == NULL)
str->data = OPENSSL_malloc(len + 1);
else
str->data = OPENSSL_realloc(c, len + 1);
if (str->data == NULL) {
OPENSSL_PUT_ERROR(ASN1, ERR_R_MALLOC_FAILURE);
str->data = c;
return (0);
}
}
str->length = len;
if (data != NULL) {
OPENSSL_memcpy(str->data, data, len);
/* an allowance for strings :-) */
str->data[len] = '\0';
}
return (1);
}
void ASN1_STRING_set0(ASN1_STRING *str, void *data, int len)
{
OPENSSL_free(str->data);
str->data = data;
str->length = len;
}
ASN1_STRING *ASN1_STRING_new(void)
{
return (ASN1_STRING_type_new(V_ASN1_OCTET_STRING));
}
ASN1_STRING *ASN1_STRING_type_new(int type)
{
ASN1_STRING *ret;
ret = (ASN1_STRING *)OPENSSL_malloc(sizeof(ASN1_STRING));
if (ret == NULL) {
OPENSSL_PUT_ERROR(ASN1, ERR_R_MALLOC_FAILURE);
return (NULL);
}
ret->length = 0;
ret->type = type;
ret->data = NULL;
ret->flags = 0;
return (ret);
}
void ASN1_STRING_free(ASN1_STRING *str)
{
if (str == NULL)
return;
OPENSSL_free(str->data);
OPENSSL_free(str);
}
int ASN1_STRING_cmp(const ASN1_STRING *a, const ASN1_STRING *b)
{
/* Capture padding bits and implicit truncation in BIT STRINGs. */
int a_length = a->length, b_length = b->length;
uint8_t a_padding = 0, b_padding = 0;
if (a->type == V_ASN1_BIT_STRING) {
a_length = asn1_bit_string_length(a, &a_padding);
}
if (b->type == V_ASN1_BIT_STRING) {
b_length = asn1_bit_string_length(b, &b_padding);
}
if (a_length < b_length) {
return -1;
}
if (a_length > b_length) {
return 1;
}
/* In a BIT STRING, the number of bits is 8 * length - padding. Invert this
* comparison so we compare by lengths. */
if (a_padding > b_padding) {
return -1;
}
if (a_padding < b_padding) {
return 1;
}
int ret = OPENSSL_memcmp(a->data, b->data, a_length);
if (ret != 0) {
return ret;
}
/* Comparing the type first is more natural, but this matches OpenSSL. */
if (a->type < b->type) {
return -1;
}
if (a->type > b->type) {
return 1;
}
return 0;
}
int ASN1_STRING_length(const ASN1_STRING *str)
{
return str->length;
}
int ASN1_STRING_type(const ASN1_STRING *str)
{
return str->type;
}
unsigned char *ASN1_STRING_data(ASN1_STRING *str)
{
return str->data;
}
const unsigned char *ASN1_STRING_get0_data(const ASN1_STRING *str)
{
return str->data;
}