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/* $OpenBSD: csi_util.c,v 1.2 2022/01/10 23:03:07 tb Exp $ */
/*
* Copyright (c) 2018 Joel Sing <jsing@openbsd.org>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <stdlib.h>
#include <openssl/bn.h>
#include "csi.h"
#include "csi_internal.h"
int
csi_integer_to_bn(struct csi_err *err, const char *field,
struct csi_integer *integer, BIGNUM **bn)
{
BN_clear_free(*bn);
*bn = NULL;
if (integer->len > CSI_MAX_BIGNUM_BYTES) {
csi_err_setx(err, CSI_ERR_INVAL, "%s too large", field);
goto err;
}
if ((*bn = BN_bin2bn(integer->data, integer->len, NULL)) == NULL) {
csi_err_setx(err, CSI_ERR_MEM, "out of memory");
goto err;
}
return 0;
err:
return -1;
}
int
csi_bn_to_integer(struct csi_err *err, const BIGNUM *bn,
struct csi_integer *integer)
{
uint8_t *b = NULL;
int len = 0;
freezero((uint8_t *)integer->data, integer->len);
integer->data = NULL;
integer->len = 0;
len = BN_num_bytes(bn);
if (len < 0 || len > CSI_MAX_BIGNUM_BYTES) {
csi_err_setx(err, CSI_ERR_INVAL,
"invalid bignum length %i", len);
goto err;
}
/* XXX - prepend zero to avoid interpretation as negative? */
if ((b = calloc(1, len)) == NULL)
goto errmem;
if (BN_bn2bin(bn, b) != len)
goto errmem;
integer->data = b;
integer->len = (size_t)len;
return 0;
errmem:
csi_err_setx(err, CSI_ERR_MEM, "out of memory");
err:
freezero(b, len);
return -1;
}
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