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annotate libtommath/bn_s_mp_get_bit.c @ 1855:35d504d59c05

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Implement server-side support for sk-ecdsa U2F-backed keys (#142) * Implement server-side support for sk-ecdsa U2F-backed keys * Fix out-of-bounds read on normal ecdsa-sha2-[identifier] keys * Fix one more potential out-of-bounds read * Check if nistp256 curve is used in sk-ecdsa-sha2- key It's the only allowed curve per PROTOCOL.u2f specification * Implement server-side support for sk-ed25519 FIDO2-backed keys * Keys with type sk-* make no sense as host keys, so they should be disabled * fix typo * Make sk-ecdsa call buf_ecdsa_verify This reduces code duplication, the SK code just handles the different message format. * Reduce sk specific code The application id can be stored in signkey, then we don't need to call sk-specific functions from svr-authpubkey * Remove debugging output, which causes compilation errors with DEBUG_TRACE disabled * Proper cleanup of sk_app Co-authored-by: Matt Johnston <[email protected]>
author egor-duda <egor-duda@users.noreply.github.com>
date Sat, 22 Jan 2022 16:53:04 +0300
parents 1051e4eea25a
children
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1051e4eea25a Update LibTomMath to 1.2.0 (#84)
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1 #include "tommath_private.h"
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2 #ifdef BN_S_MP_GET_BIT_C
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3
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4 /* LibTomMath, multiple-precision integer library -- Tom St Denis */
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5 /* SPDX-License-Identifier: Unlicense */
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6
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7 /* Get bit at position b and return MP_YES if the bit is 1, MP_NO if it is 0 */
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8 mp_bool s_mp_get_bit(const mp_int *a, unsigned int b)
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9 {
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10 mp_digit bit;
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11 int limb = (int)(b / MP_DIGIT_BIT);
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12
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13 if (limb >= a->used) {
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14 return MP_NO;
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15 }
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16
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17 bit = (mp_digit)1 << (b % MP_DIGIT_BIT);
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18 return ((a->dp[limb] & bit) != 0u) ? MP_YES : MP_NO;
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19 }
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21 #endif