Mercurial > dropbear
view libtommath/bn_mp_fread.c @ 1855:35d504d59c05
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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#include "tommath_private.h" #ifdef BN_MP_FREAD_C /* LibTomMath, multiple-precision integer library -- Tom St Denis */ /* SPDX-License-Identifier: Unlicense */ #ifndef MP_NO_FILE /* read a bigint from a file stream in ASCII */ mp_err mp_fread(mp_int *a, int radix, FILE *stream) { mp_err err; mp_sign neg; /* if first digit is - then set negative */ int ch = fgetc(stream); if (ch == (int)'-') { neg = MP_NEG; ch = fgetc(stream); } else { neg = MP_ZPOS; } /* no digits, return error */ if (ch == EOF) { return MP_ERR; } /* clear a */ mp_zero(a); do { int y; unsigned pos = (unsigned)(ch - (int)'('); if (mp_s_rmap_reverse_sz < pos) { break; } y = (int)mp_s_rmap_reverse[pos]; if ((y == 0xff) || (y >= radix)) { break; } /* shift up and add */ if ((err = mp_mul_d(a, (mp_digit)radix, a)) != MP_OKAY) { return err; } if ((err = mp_add_d(a, (mp_digit)y, a)) != MP_OKAY) { return err; } } while ((ch = fgetc(stream)) != EOF); if (a->used != 0) { a->sign = neg; } return MP_OKAY; } #endif #endif