#include <stdio.h>
#include <limits.h>
#include "cryptlib.h"
#include <openssl/buffer.h>
#include <openssl/asn1_mac.h>
static int asn1_d2i_read_bio(BIO *in, BUF_MEM **pb);
#ifndef NO_OLD_ASN1
#ifndef OPENSSL_NO_FP_API
void *ASN1_d2i_fp(void *(*xnew)(void), d2i_of_void *d2i, FILE *in, void **x)
{
BIO *b;
void *ret;
if ((b=BIO_new(BIO_s_file())) == NULL)
{
ASN1err(ASN1_F_ASN1_D2I_FP,ERR_R_BUF_LIB);
return(NULL);
}
BIO_set_fp(b,in,BIO_NOCLOSE);
ret=ASN1_d2i_bio(xnew,d2i,b,x);
BIO_free(b);
return(ret);
}
#endif
void *ASN1_d2i_bio(void *(*xnew)(void), d2i_of_void *d2i, BIO *in, void **x)
{
BUF_MEM *b = NULL;
const unsigned char *p;
void *ret=NULL;
int len;
len = asn1_d2i_read_bio(in, &b);
if(len < 0) goto err;
p=(unsigned char *)b->data;
ret=d2i(x,&p,len);
err:
if (b != NULL) BUF_MEM_free(b);
return(ret);
}
#endif
void *ASN1_item_d2i_bio(const ASN1_ITEM *it, BIO *in, void *x)
{
BUF_MEM *b = NULL;
const unsigned char *p;
void *ret=NULL;
int len;
len = asn1_d2i_read_bio(in, &b);
if(len < 0) goto err;
p=(const unsigned char *)b->data;
ret=ASN1_item_d2i(x,&p,len, it);
err:
if (b != NULL) BUF_MEM_free(b);
return(ret);
}
#ifndef OPENSSL_NO_FP_API
void *ASN1_item_d2i_fp(const ASN1_ITEM *it, FILE *in, void *x)
{
BIO *b;
char *ret;
if ((b=BIO_new(BIO_s_file())) == NULL)
{
ASN1err(ASN1_F_ASN1_ITEM_D2I_FP,ERR_R_BUF_LIB);
return(NULL);
}
BIO_set_fp(b,in,BIO_NOCLOSE);
ret=ASN1_item_d2i_bio(it,b,x);
BIO_free(b);
return(ret);
}
#endif
#define HEADER_SIZE 8
#define ASN1_CHUNK_INITIAL_SIZE (16 * 1024)
static int asn1_d2i_read_bio(BIO *in, BUF_MEM **pb)
{
BUF_MEM *b;
unsigned char *p;
int i;
ASN1_const_CTX c;
size_t want=HEADER_SIZE;
int eos=0;
size_t off=0;
size_t len=0;
b=BUF_MEM_new();
if (b == NULL)
{
ASN1err(ASN1_F_ASN1_D2I_READ_BIO,ERR_R_MALLOC_FAILURE);
return -1;
}
ERR_clear_error();
for (;;)
{
if (want >= (len-off))
{
want-=(len-off);
if (len + want < len || !BUF_MEM_grow_clean(b,len+want))
{
ASN1err(ASN1_F_ASN1_D2I_READ_BIO,ERR_R_MALLOC_FAILURE);
goto err;
}
i=BIO_read(in,&(b->data[len]),want);
if ((i < 0) && ((len-off) == 0))
{
ASN1err(ASN1_F_ASN1_D2I_READ_BIO,ASN1_R_NOT_ENOUGH_DATA);
goto err;
}
if (i > 0)
{
if (len+i < len)
{
ASN1err(ASN1_F_ASN1_D2I_READ_BIO,ASN1_R_TOO_LONG);
goto err;
}
len+=i;
}
}
p=(unsigned char *)&(b->data[off]);
c.p=p;
c.inf=ASN1_get_object(&(c.p),&(c.slen),&(c.tag),&(c.xclass),
len-off);
if (c.inf & 0x80)
{
unsigned long e;
e=ERR_GET_REASON(ERR_peek_error());
if (e != ASN1_R_TOO_LONG)
goto err;
else
ERR_clear_error();
}
i=c.p-p;
off+=i;
if (c.inf & 1)
{
eos++;
if (eos < 0)
{
ASN1err(ASN1_F_ASN1_D2I_READ_BIO,ASN1_R_HEADER_TOO_LONG);
goto err;
}
want=HEADER_SIZE;
}
else if (eos && (c.slen == 0) && (c.tag == V_ASN1_EOC))
{
eos--;
if (eos <= 0)
break;
else
want=HEADER_SIZE;
}
else
{
want=c.slen;
if (want > (len-off))
{
size_t chunk_max = ASN1_CHUNK_INITIAL_SIZE;
want-=(len-off);
if (want > INT_MAX ||
len+want < len)
{
ASN1err(ASN1_F_ASN1_D2I_READ_BIO,ASN1_R_TOO_LONG);
goto err;
}
while (want > 0)
{
size_t chunk = want > chunk_max ? chunk_max : want;
if (!BUF_MEM_grow_clean(b, len + chunk)) {
ASN1err(ASN1_F_ASN1_D2I_READ_BIO, ERR_R_MALLOC_FAILURE);
goto err;
}
want -= chunk;
while (chunk > 0) {
i = BIO_read(in, &(b->data[len]), chunk);
if (i <= 0) {
ASN1err(ASN1_F_ASN1_D2I_READ_BIO,
ASN1_R_NOT_ENOUGH_DATA);
goto err;
}
len += i;
chunk -= i;
}
if (chunk_max < INT_MAX/2)
chunk_max *= 2;
}
}
if (off + c.slen < off)
{
ASN1err(ASN1_F_ASN1_D2I_READ_BIO,ASN1_R_TOO_LONG);
goto err;
}
off+=c.slen;
if (eos <= 0)
{
break;
}
else
want=HEADER_SIZE;
}
}
if (off > INT_MAX)
{
ASN1err(ASN1_F_ASN1_D2I_READ_BIO,ASN1_R_TOO_LONG);
goto err;
}
*pb = b;
return off;
err:
if (b != NULL) BUF_MEM_free(b);
return -1;
}