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/* $OpenBSD: bn_print.c,v 1.47 2024/03/02 09:18:28 tb Exp $ */
/*
* Copyright (c) 2023 Theo Buehler <tb@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 <ctype.h>
#include <stdarg.h>
#include <stdio.h>
#include <stdint.h>
#include <stdlib.h>
#include <openssl/bio.h>
#include <openssl/bn.h>
#include "bio_local.h"
#include "bn_local.h"
#include "bytestring.h"
static int
bn_print_zero(BIO *bio, const BIGNUM *bn)
{
if (!BN_is_zero(bn))
return 0;
if (BIO_printf(bio, " 0\n") <= 0)
return 0;
return 1;
}
static int
bn_print_word(BIO *bio, const BIGNUM *bn)
{
unsigned long long word;
const char *neg = "";
if (BN_is_zero(bn) || BN_num_bytes(bn) > BN_BYTES)
return 0;
if (BN_is_negative(bn))
neg = "-";
word = BN_get_word(bn);
if (BIO_printf(bio, " %s%llu (%s0x%llx)\n", neg, word, neg, word) <= 0)
return 0;
return 1;
}
static int
bn_print_bignum(BIO *bio, const BIGNUM *bn, int indent)
{
CBS cbs;
char *hex = NULL;
size_t hex_len = 0;
size_t octets = 0;
uint8_t hi, lo;
const char *sep = ":";
int ret = 0;
if (BN_num_bytes(bn) <= BN_BYTES)
goto err;
/* Secondary indent is 4 spaces, capped at 128. */
if (indent > 124)
indent = 124;
indent += 4;
if (indent < 0)
indent = 0;
if (!bn_bn2hex_nosign(bn, &hex, &hex_len))
goto err;
CBS_init(&cbs, hex, hex_len);
if (BN_is_negative(bn)) {
if (BIO_printf(bio, " (Negative)") <= 0)
goto err;
}
while (CBS_len(&cbs) > 0) {
if (!CBS_get_u8(&cbs, &hi))
goto err;
if (!CBS_get_u8(&cbs, &lo))
goto err;
if (octets++ % 15 == 0) {
if (BIO_printf(bio, "\n%*s", indent, "") <= 0)
goto err;
}
/* First nibble has the high bit set. Insert leading 0 octet. */
if (octets == 1 && hi >= '8') {
if (BIO_printf(bio, "00:") <= 0)
goto err;
octets++;
}
if (CBS_len(&cbs) == 0)
sep = "";
if (BIO_printf(bio, "%c%c%s", tolower(hi), tolower(lo), sep) <= 0)
goto err;
}
if (BIO_printf(bio, "\n") <= 0)
goto err;
ret = 1;
err:
freezero(hex, hex_len);
return ret;
}
int
bn_printf(BIO *bio, const BIGNUM *bn, int indent, const char *fmt, ...)
{
va_list ap;
int rv;
if (bn == NULL)
return 1;
if (!BIO_indent(bio, indent, 128))
return 0;
va_start(ap, fmt);
rv = BIO_vprintf(bio, fmt, ap);
va_end(ap);
if (rv < 0)
return 0;
if (BN_is_zero(bn))
return bn_print_zero(bio, bn);
if (BN_num_bytes(bn) <= BN_BYTES)
return bn_print_word(bio, bn);
return bn_print_bignum(bio, bn, indent);
}
int
BN_print(BIO *bio, const BIGNUM *bn)
{
char *hex = NULL;
size_t hex_len = 0;
int ret = 0;
if (!bn_bn2hex_nibbles(bn, &hex, &hex_len))
goto err;
if (BIO_printf(bio, "%s", hex) <= 0)
goto err;
ret = 1;
err:
freezero(hex, hex_len);
return ret;
}
LCRYPTO_ALIAS(BN_print);
int
BN_print_fp(FILE *fp, const BIGNUM *bn)
{
char *hex = NULL;
size_t hex_len = 0;
int ret = 0;
if (!bn_bn2hex_nibbles(bn, &hex, &hex_len))
goto err;
if (fprintf(fp, "%s", hex) < 0)
goto err;
ret = 1;
err:
freezero(hex, hex_len);
return ret;
}
LCRYPTO_ALIAS(BN_print_fp);
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