Mercurial > dropbear
view libtommath/bn_mp_montgomery_setup.c @ 1815:5015c80808c5
Use MAX_HOST_LEN for TCP forwarding requests (#121)
tcpip-forward request can include hostname, which is later resolved by getaddrinfo() call.
Dropbear incorrectly assumes tcpip-forward includes only IP(v4) address. Fix this.
author | ValdikSS <iam@valdikss.org.ru> |
---|---|
date | Thu, 18 Mar 2021 16:16:17 +0300 |
parents | 1051e4eea25a |
children |
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#include "tommath_private.h" #ifdef BN_MP_MONTGOMERY_SETUP_C /* LibTomMath, multiple-precision integer library -- Tom St Denis */ /* SPDX-License-Identifier: Unlicense */ /* setups the montgomery reduction stuff */ mp_err mp_montgomery_setup(const mp_int *n, mp_digit *rho) { mp_digit x, b; /* fast inversion mod 2**k * * Based on the fact that * * XA = 1 (mod 2**n) => (X(2-XA)) A = 1 (mod 2**2n) * => 2*X*A - X*X*A*A = 1 * => 2*(1) - (1) = 1 */ b = n->dp[0]; if ((b & 1u) == 0u) { return MP_VAL; } x = (((b + 2u) & 4u) << 1) + b; /* here x*a==1 mod 2**4 */ x *= 2u - (b * x); /* here x*a==1 mod 2**8 */ #if !defined(MP_8BIT) x *= 2u - (b * x); /* here x*a==1 mod 2**16 */ #endif #if defined(MP_64BIT) || !(defined(MP_8BIT) || defined(MP_16BIT)) x *= 2u - (b * x); /* here x*a==1 mod 2**32 */ #endif #ifdef MP_64BIT x *= 2u - (b * x); /* here x*a==1 mod 2**64 */ #endif /* rho = -1/m mod b */ *rho = (mp_digit)(((mp_word)1 << (mp_word)MP_DIGIT_BIT) - x) & MP_MASK; return MP_OKAY; } #endif