Mercurial > dropbear

annotate libtommath/bn_mp_to_sbin.c @ 1928:333688ec53d0

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Handle ecdsa-sk flags, reject no-touch For the time being Dropbear will only allow SK auth with default parameters, user-presence needs to be set. In future handling of authorized_keys option "no-touch-required" can be added. This code would also be refactored to share between ecdsa and ed25519 once I get hardware/emulation to test ed25519.
author Matt Johnston <matt@ucc.asn.au>
date Wed, 30 Mar 2022 21:06:15 +0800
parents 1051e4eea25a
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1692
1051e4eea25a Update LibTomMath to 1.2.0 (#84)
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1 #include "tommath_private.h"
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2 #ifdef BN_MP_TO_SBIN_C
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3 /* LibTomMath, multiple-precision integer library -- Tom St Denis */
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4 /* SPDX-License-Identifier: Unlicense */
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5
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6 /* store in signed [big endian] format */
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7 mp_err mp_to_sbin(const mp_int *a, unsigned char *buf, size_t maxlen, size_t *written)
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8 {
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9 mp_err err;
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10 if (maxlen == 0u) {
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11 return MP_BUF;
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12 }
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13 if ((err = mp_to_ubin(a, buf + 1, maxlen - 1u, written)) != MP_OKAY) {
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14 return err;
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15 }
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16 if (written != NULL) {
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17 (*written)++;
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18 }
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19 buf[0] = (a->sign == MP_ZPOS) ? (unsigned char)0 : (unsigned char)1;
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20 return MP_OKAY;
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21 }
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22 #endif