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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-05-06 00:53:35 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-05-06 00:53:35 +0000 |
commit | 69c6a41ffb878ef98c9378ed4b1634a404cfaa7f (patch) | |
tree | b2a4f704565d62fbb129ab9dc3b35977c50e6e7f /src/libdnssec/shared/bignum.c | |
parent | Initial commit. (diff) | |
download | knot-upstream.tar.xz knot-upstream.zip |
Adding upstream version 2.7.6.upstream/2.7.6upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to '')
-rw-r--r-- | src/libdnssec/shared/bignum.c | 64 |
1 files changed, 64 insertions, 0 deletions
diff --git a/src/libdnssec/shared/bignum.c b/src/libdnssec/shared/bignum.c new file mode 100644 index 0000000..921a1e6 --- /dev/null +++ b/src/libdnssec/shared/bignum.c @@ -0,0 +1,64 @@ +/* Copyright (C) 2018 CZ.NIC, z.s.p.o. <knot-dns@labs.nic.cz> + + This program is free software: you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation, either version 3 of the License, or + (at your option) any later version. + + This program is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program. If not, see <http://www.gnu.org/licenses/>. +*/ + +#include <assert.h> +#include <string.h> + +#include "libdnssec/shared/bignum.h" + +static void skip_leading_zeroes(dnssec_binary_t *value) +{ + while (value->size > 0 && value->data[0] == 0) { + value->data += 1; + value->size -= 1; + } +} + +size_t bignum_size_u(const dnssec_binary_t *_value) +{ + dnssec_binary_t value = *_value; + skip_leading_zeroes(&value); + + if (value.size == 0) { + return value.size + 1; + } else { + return value.size; + } +} + +size_t bignum_size_s(const dnssec_binary_t *_value) +{ + dnssec_binary_t value = *_value; + skip_leading_zeroes(&value); + + if (value.size == 0 || value.data[0] & 0x80) { + return value.size + 1; + } else { + return value.size; + } +} + +void bignum_write(wire_ctx_t *ctx, size_t width, const dnssec_binary_t *_value) +{ + dnssec_binary_t value = *_value; + skip_leading_zeroes(&value); + + size_t padding_len = width - value.size; + if (padding_len > 0) { + wire_ctx_clear(ctx, padding_len); + } + wire_ctx_write(ctx, value.data, value.size); +} |