|
Packit |
c4476c |
/*
|
|
Packit |
c4476c |
* Copyright 2000-2019 The OpenSSL Project Authors. All Rights Reserved.
|
|
Packit |
c4476c |
*
|
|
Packit |
c4476c |
* Licensed under the OpenSSL license (the "License"). You may not use
|
|
Packit |
c4476c |
* this file except in compliance with the License. You can obtain a copy
|
|
Packit |
c4476c |
* in the file LICENSE in the source distribution or at
|
|
Packit |
c4476c |
* https://www.openssl.org/source/license.html
|
|
Packit |
c4476c |
*/
|
|
Packit |
c4476c |
|
|
Packit |
c4476c |
#include <stdio.h>
|
|
Packit |
c4476c |
#include "internal/cryptlib.h"
|
|
Packit |
c4476c |
#include <openssl/asn1t.h>
|
|
Packit |
c4476c |
#include <openssl/bn.h>
|
|
Packit |
c4476c |
|
|
Packit |
c4476c |
/*
|
|
Packit |
c4476c |
* Custom primitive type for BIGNUM handling. This reads in an ASN1_INTEGER
|
|
Packit |
c4476c |
* as a BIGNUM directly. Currently it ignores the sign which isn't a problem
|
|
Packit |
c4476c |
* since all BIGNUMs used are non negative and anything that looks negative
|
|
Packit |
c4476c |
* is normally due to an encoding error.
|
|
Packit |
c4476c |
*/
|
|
Packit |
c4476c |
|
|
Packit |
c4476c |
#define BN_SENSITIVE 1
|
|
Packit |
c4476c |
|
|
Packit |
c4476c |
static int bn_new(ASN1_VALUE **pval, const ASN1_ITEM *it);
|
|
Packit |
c4476c |
static int bn_secure_new(ASN1_VALUE **pval, const ASN1_ITEM *it);
|
|
Packit |
c4476c |
static void bn_free(ASN1_VALUE **pval, const ASN1_ITEM *it);
|
|
Packit |
c4476c |
|
|
Packit |
c4476c |
static int bn_i2c(ASN1_VALUE **pval, unsigned char *cont, int *putype,
|
|
Packit |
c4476c |
const ASN1_ITEM *it);
|
|
Packit |
c4476c |
static int bn_c2i(ASN1_VALUE **pval, const unsigned char *cont, int len,
|
|
Packit |
c4476c |
int utype, char *free_cont, const ASN1_ITEM *it);
|
|
Packit |
c4476c |
static int bn_secure_c2i(ASN1_VALUE **pval, const unsigned char *cont, int len,
|
|
Packit |
c4476c |
int utype, char *free_cont, const ASN1_ITEM *it);
|
|
Packit |
c4476c |
static int bn_print(BIO *out, ASN1_VALUE **pval, const ASN1_ITEM *it,
|
|
Packit |
c4476c |
int indent, const ASN1_PCTX *pctx);
|
|
Packit |
c4476c |
|
|
Packit |
c4476c |
static ASN1_PRIMITIVE_FUNCS bignum_pf = {
|
|
Packit |
c4476c |
NULL, 0,
|
|
Packit |
c4476c |
bn_new,
|
|
Packit |
c4476c |
bn_free,
|
|
Packit |
c4476c |
0,
|
|
Packit |
c4476c |
bn_c2i,
|
|
Packit |
c4476c |
bn_i2c,
|
|
Packit |
c4476c |
bn_print
|
|
Packit |
c4476c |
};
|
|
Packit |
c4476c |
|
|
Packit |
c4476c |
static ASN1_PRIMITIVE_FUNCS cbignum_pf = {
|
|
Packit |
c4476c |
NULL, 0,
|
|
Packit |
c4476c |
bn_secure_new,
|
|
Packit |
c4476c |
bn_free,
|
|
Packit |
c4476c |
0,
|
|
Packit |
c4476c |
bn_secure_c2i,
|
|
Packit |
c4476c |
bn_i2c,
|
|
Packit |
c4476c |
bn_print
|
|
Packit |
c4476c |
};
|
|
Packit |
c4476c |
|
|
Packit |
c4476c |
ASN1_ITEM_start(BIGNUM)
|
|
Packit |
c4476c |
ASN1_ITYPE_PRIMITIVE, V_ASN1_INTEGER, NULL, 0, &bignum_pf, 0, "BIGNUM"
|
|
Packit |
c4476c |
ASN1_ITEM_end(BIGNUM)
|
|
Packit |
c4476c |
|
|
Packit |
c4476c |
ASN1_ITEM_start(CBIGNUM)
|
|
Packit |
c4476c |
ASN1_ITYPE_PRIMITIVE, V_ASN1_INTEGER, NULL, 0, &cbignum_pf, BN_SENSITIVE, "CBIGNUM"
|
|
Packit |
c4476c |
ASN1_ITEM_end(CBIGNUM)
|
|
Packit |
c4476c |
|
|
Packit |
c4476c |
static int bn_new(ASN1_VALUE **pval, const ASN1_ITEM *it)
|
|
Packit |
c4476c |
{
|
|
Packit |
c4476c |
*pval = (ASN1_VALUE *)BN_new();
|
|
Packit |
c4476c |
if (*pval != NULL)
|
|
Packit |
c4476c |
return 1;
|
|
Packit |
c4476c |
else
|
|
Packit |
c4476c |
return 0;
|
|
Packit |
c4476c |
}
|
|
Packit |
c4476c |
|
|
Packit |
c4476c |
static int bn_secure_new(ASN1_VALUE **pval, const ASN1_ITEM *it)
|
|
Packit |
c4476c |
{
|
|
Packit |
c4476c |
*pval = (ASN1_VALUE *)BN_secure_new();
|
|
Packit |
c4476c |
if (*pval != NULL)
|
|
Packit |
c4476c |
return 1;
|
|
Packit |
c4476c |
else
|
|
Packit |
c4476c |
return 0;
|
|
Packit |
c4476c |
}
|
|
Packit |
c4476c |
|
|
Packit |
c4476c |
static void bn_free(ASN1_VALUE **pval, const ASN1_ITEM *it)
|
|
Packit |
c4476c |
{
|
|
Packit |
c4476c |
if (*pval == NULL)
|
|
Packit |
c4476c |
return;
|
|
Packit |
c4476c |
if (it->size & BN_SENSITIVE)
|
|
Packit |
c4476c |
BN_clear_free((BIGNUM *)*pval);
|
|
Packit |
c4476c |
else
|
|
Packit |
c4476c |
BN_free((BIGNUM *)*pval);
|
|
Packit |
c4476c |
*pval = NULL;
|
|
Packit |
c4476c |
}
|
|
Packit |
c4476c |
|
|
Packit |
c4476c |
static int bn_i2c(ASN1_VALUE **pval, unsigned char *cont, int *putype,
|
|
Packit |
c4476c |
const ASN1_ITEM *it)
|
|
Packit |
c4476c |
{
|
|
Packit |
c4476c |
BIGNUM *bn;
|
|
Packit |
c4476c |
int pad;
|
|
Packit |
c4476c |
if (*pval == NULL)
|
|
Packit |
c4476c |
return -1;
|
|
Packit |
c4476c |
bn = (BIGNUM *)*pval;
|
|
Packit |
c4476c |
/* If MSB set in an octet we need a padding byte */
|
|
Packit |
c4476c |
if (BN_num_bits(bn) & 0x7)
|
|
Packit |
c4476c |
pad = 0;
|
|
Packit |
c4476c |
else
|
|
Packit |
c4476c |
pad = 1;
|
|
Packit |
c4476c |
if (cont) {
|
|
Packit |
c4476c |
if (pad)
|
|
Packit |
c4476c |
*cont++ = 0;
|
|
Packit |
c4476c |
BN_bn2bin(bn, cont);
|
|
Packit |
c4476c |
}
|
|
Packit |
c4476c |
return pad + BN_num_bytes(bn);
|
|
Packit |
c4476c |
}
|
|
Packit |
c4476c |
|
|
Packit |
c4476c |
static int bn_c2i(ASN1_VALUE **pval, const unsigned char *cont, int len,
|
|
Packit |
c4476c |
int utype, char *free_cont, const ASN1_ITEM *it)
|
|
Packit |
c4476c |
{
|
|
Packit |
c4476c |
BIGNUM *bn;
|
|
Packit |
c4476c |
|
|
Packit |
c4476c |
if (*pval == NULL && !bn_new(pval, it))
|
|
Packit |
c4476c |
return 0;
|
|
Packit |
c4476c |
bn = (BIGNUM *)*pval;
|
|
Packit |
c4476c |
if (!BN_bin2bn(cont, len, bn)) {
|
|
Packit |
c4476c |
bn_free(pval, it);
|
|
Packit |
c4476c |
return 0;
|
|
Packit |
c4476c |
}
|
|
Packit |
c4476c |
return 1;
|
|
Packit |
c4476c |
}
|
|
Packit |
c4476c |
|
|
Packit |
c4476c |
static int bn_secure_c2i(ASN1_VALUE **pval, const unsigned char *cont, int len,
|
|
Packit |
c4476c |
int utype, char *free_cont, const ASN1_ITEM *it)
|
|
Packit |
c4476c |
{
|
|
Packit |
c4476c |
int ret;
|
|
Packit |
c4476c |
BIGNUM *bn;
|
|
Packit |
c4476c |
|
|
Packit |
c4476c |
if (*pval == NULL && !bn_secure_new(pval, it))
|
|
Packit |
c4476c |
return 0;
|
|
Packit |
c4476c |
|
|
Packit |
c4476c |
ret = bn_c2i(pval, cont, len, utype, free_cont, it);
|
|
Packit |
c4476c |
if (!ret)
|
|
Packit |
c4476c |
return 0;
|
|
Packit |
c4476c |
|
|
Packit |
c4476c |
/* Set constant-time flag for all secure BIGNUMS */
|
|
Packit |
c4476c |
bn = (BIGNUM *)*pval;
|
|
Packit |
c4476c |
BN_set_flags(bn, BN_FLG_CONSTTIME);
|
|
Packit |
c4476c |
return ret;
|
|
Packit |
c4476c |
}
|
|
Packit |
c4476c |
|
|
Packit |
c4476c |
static int bn_print(BIO *out, ASN1_VALUE **pval, const ASN1_ITEM *it,
|
|
Packit |
c4476c |
int indent, const ASN1_PCTX *pctx)
|
|
Packit |
c4476c |
{
|
|
Packit |
c4476c |
if (!BN_print(out, *(BIGNUM **)pval))
|
|
Packit |
c4476c |
return 0;
|
|
Packit |
c4476c |
if (BIO_puts(out, "\n") <= 0)
|
|
Packit |
c4476c |
return 0;
|
|
Packit |
c4476c |
return 1;
|
|
Packit |
c4476c |
}
|