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Packit |
c4476c |
/*
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Packit |
c4476c |
* Copyright 1995-2017 The OpenSSL Project Authors. All Rights Reserved.
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Packit |
c4476c |
*
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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
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Packit |
c4476c |
* in the file LICENSE in the source distribution or at
|
|
Packit |
c4476c |
* https://www.openssl.org/source/license.html
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Packit |
c4476c |
*/
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Packit |
c4476c |
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Packit |
c4476c |
#include <stdio.h>
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Packit |
c4476c |
#include "crypto/ctype.h"
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Packit |
c4476c |
#include <limits.h>
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c4476c |
#include "internal/cryptlib.h"
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Packit |
c4476c |
#include <openssl/buffer.h>
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Packit |
c4476c |
#include "bn_local.h"
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Packit |
c4476c |
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Packit |
c4476c |
static const char Hex[] = "0123456789ABCDEF";
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Packit |
c4476c |
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Packit |
c4476c |
/* Must 'OPENSSL_free' the returned data */
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|
Packit |
c4476c |
char *BN_bn2hex(const BIGNUM *a)
|
|
Packit |
c4476c |
{
|
|
Packit |
c4476c |
int i, j, v, z = 0;
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|
Packit |
c4476c |
char *buf;
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|
Packit |
c4476c |
char *p;
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|
Packit |
c4476c |
|
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Packit |
c4476c |
if (BN_is_zero(a))
|
|
Packit |
c4476c |
return OPENSSL_strdup("0");
|
|
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c4476c |
buf = OPENSSL_malloc(a->top * BN_BYTES * 2 + 2);
|
|
Packit |
c4476c |
if (buf == NULL) {
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|
Packit |
c4476c |
BNerr(BN_F_BN_BN2HEX, ERR_R_MALLOC_FAILURE);
|
|
Packit |
c4476c |
goto err;
|
|
Packit |
c4476c |
}
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|
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c4476c |
p = buf;
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|
Packit |
c4476c |
if (a->neg)
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|
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c4476c |
*p++ = '-';
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|
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c4476c |
for (i = a->top - 1; i >= 0; i--) {
|
|
Packit |
c4476c |
for (j = BN_BITS2 - 8; j >= 0; j -= 8) {
|
|
Packit |
c4476c |
/* strip leading zeros */
|
|
Packit |
c4476c |
v = (int)((a->d[i] >> j) & 0xff);
|
|
Packit |
c4476c |
if (z || v != 0) {
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|
Packit |
c4476c |
*p++ = Hex[v >> 4];
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Packit |
c4476c |
*p++ = Hex[v & 0x0f];
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Packit |
c4476c |
z = 1;
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|
Packit |
c4476c |
}
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|
Packit |
c4476c |
}
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|
Packit |
c4476c |
}
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|
Packit |
c4476c |
*p = '\0';
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|
Packit |
c4476c |
err:
|
|
Packit |
c4476c |
return buf;
|
|
Packit |
c4476c |
}
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|
Packit |
c4476c |
|
|
Packit |
c4476c |
/* Must 'OPENSSL_free' the returned data */
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|
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c4476c |
char *BN_bn2dec(const BIGNUM *a)
|
|
Packit |
c4476c |
{
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|
Packit |
c4476c |
int i = 0, num, ok = 0, n, tbytes;
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|
Packit |
c4476c |
char *buf = NULL;
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|
Packit |
c4476c |
char *p;
|
|
Packit |
c4476c |
BIGNUM *t = NULL;
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|
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c4476c |
BN_ULONG *bn_data = NULL, *lp;
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|
Packit |
c4476c |
int bn_data_num;
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|
Packit |
c4476c |
|
|
Packit |
c4476c |
/*-
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|
Packit |
c4476c |
* get an upper bound for the length of the decimal integer
|
|
Packit |
c4476c |
* num <= (BN_num_bits(a) + 1) * log(2)
|
|
Packit |
c4476c |
* <= 3 * BN_num_bits(a) * 0.101 + log(2) + 1 (rounding error)
|
|
Packit |
c4476c |
* <= 3 * BN_num_bits(a) / 10 + 3 * BN_num_bits / 1000 + 1 + 1
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|
Packit |
c4476c |
*/
|
|
Packit |
c4476c |
i = BN_num_bits(a) * 3;
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|
Packit |
c4476c |
num = (i / 10 + i / 1000 + 1) + 1;
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|
Packit |
c4476c |
tbytes = num + 3; /* negative and terminator and one spare? */
|
|
Packit |
c4476c |
bn_data_num = num / BN_DEC_NUM + 1;
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|
Packit |
c4476c |
bn_data = OPENSSL_malloc(bn_data_num * sizeof(BN_ULONG));
|
|
Packit |
c4476c |
buf = OPENSSL_malloc(tbytes);
|
|
Packit |
c4476c |
if (buf == NULL || bn_data == NULL) {
|
|
Packit |
c4476c |
BNerr(BN_F_BN_BN2DEC, ERR_R_MALLOC_FAILURE);
|
|
Packit |
c4476c |
goto err;
|
|
Packit |
c4476c |
}
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|
Packit |
c4476c |
if ((t = BN_dup(a)) == NULL)
|
|
Packit |
c4476c |
goto err;
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|
Packit |
c4476c |
|
|
Packit |
c4476c |
p = buf;
|
|
Packit |
c4476c |
lp = bn_data;
|
|
Packit |
c4476c |
if (BN_is_zero(t)) {
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|
Packit |
c4476c |
*p++ = '0';
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|
Packit |
c4476c |
*p++ = '\0';
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|
Packit |
c4476c |
} else {
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|
Packit |
c4476c |
if (BN_is_negative(t))
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|
Packit |
c4476c |
*p++ = '-';
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|
Packit |
c4476c |
|
|
Packit |
c4476c |
while (!BN_is_zero(t)) {
|
|
Packit |
c4476c |
if (lp - bn_data >= bn_data_num)
|
|
Packit |
c4476c |
goto err;
|
|
Packit |
c4476c |
*lp = BN_div_word(t, BN_DEC_CONV);
|
|
Packit |
c4476c |
if (*lp == (BN_ULONG)-1)
|
|
Packit |
c4476c |
goto err;
|
|
Packit |
c4476c |
lp++;
|
|
Packit |
c4476c |
}
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|
Packit |
c4476c |
lp--;
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|
Packit |
c4476c |
/*
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|
Packit |
c4476c |
* We now have a series of blocks, BN_DEC_NUM chars in length, where
|
|
Packit |
c4476c |
* the last one needs truncation. The blocks need to be reversed in
|
|
Packit |
c4476c |
* order.
|
|
Packit |
c4476c |
*/
|
|
Packit |
c4476c |
n = BIO_snprintf(p, tbytes - (size_t)(p - buf), BN_DEC_FMT1, *lp);
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|
Packit |
c4476c |
if (n < 0)
|
|
Packit |
c4476c |
goto err;
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|
Packit |
c4476c |
p += n;
|
|
Packit |
c4476c |
while (lp != bn_data) {
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|
Packit |
c4476c |
lp--;
|
|
Packit |
c4476c |
n = BIO_snprintf(p, tbytes - (size_t)(p - buf), BN_DEC_FMT2, *lp);
|
|
Packit |
c4476c |
if (n < 0)
|
|
Packit |
c4476c |
goto err;
|
|
Packit |
c4476c |
p += n;
|
|
Packit |
c4476c |
}
|
|
Packit |
c4476c |
}
|
|
Packit |
c4476c |
ok = 1;
|
|
Packit |
c4476c |
err:
|
|
Packit |
c4476c |
OPENSSL_free(bn_data);
|
|
Packit |
c4476c |
BN_free(t);
|
|
Packit |
c4476c |
if (ok)
|
|
Packit |
c4476c |
return buf;
|
|
Packit |
c4476c |
OPENSSL_free(buf);
|
|
Packit |
c4476c |
return NULL;
|
|
Packit |
c4476c |
}
|
|
Packit |
c4476c |
|
|
Packit |
c4476c |
int BN_hex2bn(BIGNUM **bn, const char *a)
|
|
Packit |
c4476c |
{
|
|
Packit |
c4476c |
BIGNUM *ret = NULL;
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|
Packit |
c4476c |
BN_ULONG l = 0;
|
|
Packit |
c4476c |
int neg = 0, h, m, i, j, k, c;
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|
Packit |
c4476c |
int num;
|
|
Packit |
c4476c |
|
|
Packit |
c4476c |
if (a == NULL || *a == '\0')
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|
Packit |
c4476c |
return 0;
|
|
Packit |
c4476c |
|
|
Packit |
c4476c |
if (*a == '-') {
|
|
Packit |
c4476c |
neg = 1;
|
|
Packit |
c4476c |
a++;
|
|
Packit |
c4476c |
}
|
|
Packit |
c4476c |
|
|
Packit |
c4476c |
for (i = 0; i <= INT_MAX / 4 && ossl_isxdigit(a[i]); i++)
|
|
Packit |
c4476c |
continue;
|
|
Packit |
c4476c |
|
|
Packit |
c4476c |
if (i == 0 || i > INT_MAX / 4)
|
|
Packit |
c4476c |
goto err;
|
|
Packit |
c4476c |
|
|
Packit |
c4476c |
num = i + neg;
|
|
Packit |
c4476c |
if (bn == NULL)
|
|
Packit |
c4476c |
return num;
|
|
Packit |
c4476c |
|
|
Packit |
c4476c |
/* a is the start of the hex digits, and it is 'i' long */
|
|
Packit |
c4476c |
if (*bn == NULL) {
|
|
Packit |
c4476c |
if ((ret = BN_new()) == NULL)
|
|
Packit |
c4476c |
return 0;
|
|
Packit |
c4476c |
} else {
|
|
Packit |
c4476c |
ret = *bn;
|
|
Packit |
c4476c |
BN_zero(ret);
|
|
Packit |
c4476c |
}
|
|
Packit |
c4476c |
|
|
Packit |
c4476c |
/* i is the number of hex digits */
|
|
Packit |
c4476c |
if (bn_expand(ret, i * 4) == NULL)
|
|
Packit |
c4476c |
goto err;
|
|
Packit |
c4476c |
|
|
Packit |
c4476c |
j = i; /* least significant 'hex' */
|
|
Packit |
c4476c |
m = 0;
|
|
Packit |
c4476c |
h = 0;
|
|
Packit |
c4476c |
while (j > 0) {
|
|
Packit |
c4476c |
m = (BN_BYTES * 2 <= j) ? BN_BYTES * 2 : j;
|
|
Packit |
c4476c |
l = 0;
|
|
Packit |
c4476c |
for (;;) {
|
|
Packit |
c4476c |
c = a[j - m];
|
|
Packit |
c4476c |
k = OPENSSL_hexchar2int(c);
|
|
Packit |
c4476c |
if (k < 0)
|
|
Packit |
c4476c |
k = 0; /* paranoia */
|
|
Packit |
c4476c |
l = (l << 4) | k;
|
|
Packit |
c4476c |
|
|
Packit |
c4476c |
if (--m <= 0) {
|
|
Packit |
c4476c |
ret->d[h++] = l;
|
|
Packit |
c4476c |
break;
|
|
Packit |
c4476c |
}
|
|
Packit |
c4476c |
}
|
|
Packit |
c4476c |
j -= BN_BYTES * 2;
|
|
Packit |
c4476c |
}
|
|
Packit |
c4476c |
ret->top = h;
|
|
Packit |
c4476c |
bn_correct_top(ret);
|
|
Packit |
c4476c |
|
|
Packit |
c4476c |
*bn = ret;
|
|
Packit |
c4476c |
bn_check_top(ret);
|
|
Packit |
c4476c |
/* Don't set the negative flag if it's zero. */
|
|
Packit |
c4476c |
if (ret->top != 0)
|
|
Packit |
c4476c |
ret->neg = neg;
|
|
Packit |
c4476c |
return num;
|
|
Packit |
c4476c |
err:
|
|
Packit |
c4476c |
if (*bn == NULL)
|
|
Packit |
c4476c |
BN_free(ret);
|
|
Packit |
c4476c |
return 0;
|
|
Packit |
c4476c |
}
|
|
Packit |
c4476c |
|
|
Packit |
c4476c |
int BN_dec2bn(BIGNUM **bn, const char *a)
|
|
Packit |
c4476c |
{
|
|
Packit |
c4476c |
BIGNUM *ret = NULL;
|
|
Packit |
c4476c |
BN_ULONG l = 0;
|
|
Packit |
c4476c |
int neg = 0, i, j;
|
|
Packit |
c4476c |
int num;
|
|
Packit |
c4476c |
|
|
Packit |
c4476c |
if (a == NULL || *a == '\0')
|
|
Packit |
c4476c |
return 0;
|
|
Packit |
c4476c |
if (*a == '-') {
|
|
Packit |
c4476c |
neg = 1;
|
|
Packit |
c4476c |
a++;
|
|
Packit |
c4476c |
}
|
|
Packit |
c4476c |
|
|
Packit |
c4476c |
for (i = 0; i <= INT_MAX / 4 && ossl_isdigit(a[i]); i++)
|
|
Packit |
c4476c |
continue;
|
|
Packit |
c4476c |
|
|
Packit |
c4476c |
if (i == 0 || i > INT_MAX / 4)
|
|
Packit |
c4476c |
goto err;
|
|
Packit |
c4476c |
|
|
Packit |
c4476c |
num = i + neg;
|
|
Packit |
c4476c |
if (bn == NULL)
|
|
Packit |
c4476c |
return num;
|
|
Packit |
c4476c |
|
|
Packit |
c4476c |
/*
|
|
Packit |
c4476c |
* a is the start of the digits, and it is 'i' long. We chop it into
|
|
Packit |
c4476c |
* BN_DEC_NUM digits at a time
|
|
Packit |
c4476c |
*/
|
|
Packit |
c4476c |
if (*bn == NULL) {
|
|
Packit |
c4476c |
if ((ret = BN_new()) == NULL)
|
|
Packit |
c4476c |
return 0;
|
|
Packit |
c4476c |
} else {
|
|
Packit |
c4476c |
ret = *bn;
|
|
Packit |
c4476c |
BN_zero(ret);
|
|
Packit |
c4476c |
}
|
|
Packit |
c4476c |
|
|
Packit |
c4476c |
/* i is the number of digits, a bit of an over expand */
|
|
Packit |
c4476c |
if (bn_expand(ret, i * 4) == NULL)
|
|
Packit |
c4476c |
goto err;
|
|
Packit |
c4476c |
|
|
Packit |
c4476c |
j = BN_DEC_NUM - i % BN_DEC_NUM;
|
|
Packit |
c4476c |
if (j == BN_DEC_NUM)
|
|
Packit |
c4476c |
j = 0;
|
|
Packit |
c4476c |
l = 0;
|
|
Packit |
c4476c |
while (--i >= 0) {
|
|
Packit |
c4476c |
l *= 10;
|
|
Packit |
c4476c |
l += *a - '0';
|
|
Packit |
c4476c |
a++;
|
|
Packit |
c4476c |
if (++j == BN_DEC_NUM) {
|
|
Packit |
c4476c |
if (!BN_mul_word(ret, BN_DEC_CONV)
|
|
Packit |
c4476c |
|| !BN_add_word(ret, l))
|
|
Packit |
c4476c |
goto err;
|
|
Packit |
c4476c |
l = 0;
|
|
Packit |
c4476c |
j = 0;
|
|
Packit |
c4476c |
}
|
|
Packit |
c4476c |
}
|
|
Packit |
c4476c |
|
|
Packit |
c4476c |
bn_correct_top(ret);
|
|
Packit |
c4476c |
*bn = ret;
|
|
Packit |
c4476c |
bn_check_top(ret);
|
|
Packit |
c4476c |
/* Don't set the negative flag if it's zero. */
|
|
Packit |
c4476c |
if (ret->top != 0)
|
|
Packit |
c4476c |
ret->neg = neg;
|
|
Packit |
c4476c |
return num;
|
|
Packit |
c4476c |
err:
|
|
Packit |
c4476c |
if (*bn == NULL)
|
|
Packit |
c4476c |
BN_free(ret);
|
|
Packit |
c4476c |
return 0;
|
|
Packit |
c4476c |
}
|
|
Packit |
c4476c |
|
|
Packit |
c4476c |
int BN_asc2bn(BIGNUM **bn, const char *a)
|
|
Packit |
c4476c |
{
|
|
Packit |
c4476c |
const char *p = a;
|
|
Packit |
c4476c |
|
|
Packit |
c4476c |
if (*p == '-')
|
|
Packit |
c4476c |
p++;
|
|
Packit |
c4476c |
|
|
Packit |
c4476c |
if (p[0] == '0' && (p[1] == 'X' || p[1] == 'x')) {
|
|
Packit |
c4476c |
if (!BN_hex2bn(bn, p + 2))
|
|
Packit |
c4476c |
return 0;
|
|
Packit |
c4476c |
} else {
|
|
Packit |
c4476c |
if (!BN_dec2bn(bn, p))
|
|
Packit |
c4476c |
return 0;
|
|
Packit |
c4476c |
}
|
|
Packit |
c4476c |
/* Don't set the negative flag if it's zero. */
|
|
Packit |
c4476c |
if (*a == '-' && (*bn)->top != 0)
|
|
Packit |
c4476c |
(*bn)->neg = 1;
|
|
Packit |
c4476c |
return 1;
|
|
Packit |
c4476c |
}
|
|
Packit |
c4476c |
|
|
Packit |
c4476c |
# ifndef OPENSSL_NO_STDIO
|
|
Packit |
c4476c |
int BN_print_fp(FILE *fp, const BIGNUM *a)
|
|
Packit |
c4476c |
{
|
|
Packit |
c4476c |
BIO *b;
|
|
Packit |
c4476c |
int ret;
|
|
Packit |
c4476c |
|
|
Packit |
c4476c |
if ((b = BIO_new(BIO_s_file())) == NULL)
|
|
Packit |
c4476c |
return 0;
|
|
Packit |
c4476c |
BIO_set_fp(b, fp, BIO_NOCLOSE);
|
|
Packit |
c4476c |
ret = BN_print(b, a);
|
|
Packit |
c4476c |
BIO_free(b);
|
|
Packit |
c4476c |
return ret;
|
|
Packit |
c4476c |
}
|
|
Packit |
c4476c |
# endif
|
|
Packit |
c4476c |
|
|
Packit |
c4476c |
int BN_print(BIO *bp, const BIGNUM *a)
|
|
Packit |
c4476c |
{
|
|
Packit |
c4476c |
int i, j, v, z = 0;
|
|
Packit |
c4476c |
int ret = 0;
|
|
Packit |
c4476c |
|
|
Packit |
c4476c |
if ((a->neg) && BIO_write(bp, "-", 1) != 1)
|
|
Packit |
c4476c |
goto end;
|
|
Packit |
c4476c |
if (BN_is_zero(a) && BIO_write(bp, "0", 1) != 1)
|
|
Packit |
c4476c |
goto end;
|
|
Packit |
c4476c |
for (i = a->top - 1; i >= 0; i--) {
|
|
Packit |
c4476c |
for (j = BN_BITS2 - 4; j >= 0; j -= 4) {
|
|
Packit |
c4476c |
/* strip leading zeros */
|
|
Packit |
c4476c |
v = (int)((a->d[i] >> j) & 0x0f);
|
|
Packit |
c4476c |
if (z || v != 0) {
|
|
Packit |
c4476c |
if (BIO_write(bp, &Hex[v], 1) != 1)
|
|
Packit |
c4476c |
goto end;
|
|
Packit |
c4476c |
z = 1;
|
|
Packit |
c4476c |
}
|
|
Packit |
c4476c |
}
|
|
Packit |
c4476c |
}
|
|
Packit |
c4476c |
ret = 1;
|
|
Packit |
c4476c |
end:
|
|
Packit |
c4476c |
return ret;
|
|
Packit |
c4476c |
}
|
|
Packit |
c4476c |
|
|
Packit |
c4476c |
char *BN_options(void)
|
|
Packit |
c4476c |
{
|
|
Packit |
c4476c |
static int init = 0;
|
|
Packit |
c4476c |
static char data[16];
|
|
Packit |
c4476c |
|
|
Packit |
c4476c |
if (!init) {
|
|
Packit |
c4476c |
init++;
|
|
Packit |
c4476c |
#ifdef BN_LLONG
|
|
Packit |
c4476c |
BIO_snprintf(data, sizeof(data), "bn(%zu,%zu)",
|
|
Packit |
c4476c |
sizeof(BN_ULLONG) * 8, sizeof(BN_ULONG) * 8);
|
|
Packit |
c4476c |
#else
|
|
Packit |
c4476c |
BIO_snprintf(data, sizeof(data), "bn(%zu,%zu)",
|
|
Packit |
c4476c |
sizeof(BN_ULONG) * 8, sizeof(BN_ULONG) * 8);
|
|
Packit |
c4476c |
#endif
|
|
Packit |
c4476c |
}
|
|
Packit |
c4476c |
return data;
|
|
Packit |
c4476c |
}
|