A local copy of OpenSSL from GitHub
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/*
* Copyright 1995-2016 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 <limits.h>
#include "internal/cryptlib.h"
#include <openssl/asn1.h>
static int asn1_get_length(const unsigned char **pp, int *inf, long *rl,
long max);
static void asn1_put_length(unsigned char **pp, int length);
static int _asn1_check_infinite_end(const unsigned char **p, long len)
{
/*
* If there is 0 or 1 byte left, the length check should pick things up
*/
if (len <= 0)
return (1);
else if ((len >= 2) && ((*p)[0] == 0) && ((*p)[1] == 0)) {
(*p) += 2;
return (1);
}
return (0);
}
int ASN1_check_infinite_end(unsigned char **p, long len)
{
return _asn1_check_infinite_end((const unsigned char **)p, len);
}
int ASN1_const_check_infinite_end(const unsigned char **p, long len)
{
return _asn1_check_infinite_end(p, len);
}
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, inf;
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;
}
*ptag = tag;
*pclass = xclass;
if (!asn1_get_length(&p, &inf, plength, max))
goto err;
if (inf && !(ret & V_ASN1_CONSTRUCTED))
goto err;
if (*plength > (omax - (p - *pp))) {
ASN1err(ASN1_F_ASN1_GET_OBJECT, ASN1_R_TOO_LONG);
/*
* Set this so that even if things are not long enough the values are
* set correctly
*/
ret |= 0x80;
}
*pp = p;
return (ret | inf);
err:
ASN1err(ASN1_F_ASN1_GET_OBJECT, ASN1_R_HEADER_TOO_LONG);
return (0x80);
}
static int asn1_get_length(const unsigned char **pp, int *inf, long *rl,
long max)
{
const unsigned char *p = *pp;
unsigned long ret = 0;
unsigned long i;
if (max-- < 1)
return 0;
if (*p == 0x80) {
*inf = 1;
ret = 0;
p++;
} else {
*inf = 0;
i = *p & 0x7f;
if (*(p++) & 0x80) {
if (max < (long)i + 1)
return 0;
/* Skip leading zeroes */
while (i && *p == 0) {
p++;
i--;
}
if (i > sizeof(long))
return 0;
while (i-- > 0) {
ret <<= 8L;
ret |= *(p++);
}
} else
ret = i;
}
if (ret > LONG_MAX)
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)
{
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;
ret = length;
ret++;
if (tag >= 31) {
while (tag > 0) {
tag >>= 7;
ret++;
}
}
if (constructed == 2)
return ret + 3;
ret++;
if (length > 127) {
while (length > 0) {
length >>= 8;
ret++;
}
}
return (ret);
}
int ASN1_STRING_copy(ASN1_STRING *dst, const ASN1_STRING *str)
{
if (str == NULL)
return 0;
dst->type = str->type;
if (!ASN1_STRING_set(dst, str->data, str->length))
return 0;
/* Copy flags but preserve embed value */
dst->flags &= ASN1_STRING_FLAG_EMBED;
dst->flags |= str->flags & ~ASN1_STRING_FLAG_EMBED;
return 1;
}
ASN1_STRING *ASN1_STRING_dup(const ASN1_STRING *str)
{
ASN1_STRING *ret;
if (!str)
return NULL;
ret = ASN1_STRING_new();
if (ret == NULL)
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;
str->data = OPENSSL_realloc(c, len + 1);
if (str->data == NULL) {
ASN1err(ASN1_F_ASN1_STRING_SET, ERR_R_MALLOC_FAILURE);
str->data = c;
return (0);
}
}
str->length = len;
if (data != NULL) {
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 = OPENSSL_zalloc(sizeof(*ret));
if (ret == NULL) {
ASN1err(ASN1_F_ASN1_STRING_TYPE_NEW, ERR_R_MALLOC_FAILURE);
return (NULL);
}
ret->type = type;
return (ret);
}
void ASN1_STRING_free(ASN1_STRING *a)
{
if (a == NULL)
return;
if (!(a->flags & ASN1_STRING_FLAG_NDEF))
OPENSSL_free(a->data);
if (!(a->flags & ASN1_STRING_FLAG_EMBED))
OPENSSL_free(a);
}
void ASN1_STRING_clear_free(ASN1_STRING *a)
{
if (a == NULL)
return;
if (a->data && !(a->flags & ASN1_STRING_FLAG_NDEF))
OPENSSL_cleanse(a->data, a->length);
ASN1_STRING_free(a);
}
int ASN1_STRING_cmp(const ASN1_STRING *a, const ASN1_STRING *b)
{
int i;
i = (a->length - b->length);
if (i == 0) {
i = memcmp(a->data, b->data, a->length);
if (i == 0)
return (a->type - b->type);
else
return (i);
} else
return (i);
}
int ASN1_STRING_length(const ASN1_STRING *x)
{
return x->length;
}
void ASN1_STRING_length_set(ASN1_STRING *x, int len)
{
x->length = len;
}
int ASN1_STRING_type(ASN1_STRING *x)
{
return x->type;
}
unsigned char *ASN1_STRING_data(ASN1_STRING *x)
{
return x->data;
}