94 lines
2.2 KiB
C
94 lines
2.2 KiB
C
/*
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* Copyright (c) 2018 Thomas Pornin <pornin@bolet.org>
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*
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* Permission is hereby granted, free of charge, to any person obtaining
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* a copy of this software and associated documentation files (the
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* "Software"), to deal in the Software without restriction, including
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* without limitation the rights to use, copy, modify, merge, publish,
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* distribute, sublicense, and/or sell copies of the Software, and to
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* permit persons to whom the Software is furnished to do so, subject to
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* the following conditions:
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*
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* The above copyright notice and this permission notice shall be
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* included in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
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* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
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* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*/
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#include "inner.h"
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/* see inner.h */
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br_asn1_uint
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br_asn1_uint_prepare(const void *xdata, size_t xlen)
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{
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const unsigned char *x;
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br_asn1_uint t;
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x = xdata;
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while (xlen > 0 && *x == 0) {
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x ++;
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xlen --;
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}
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t.data = x;
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t.len = xlen;
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t.asn1len = xlen;
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if (xlen == 0 || x[0] >= 0x80) {
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t.asn1len ++;
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}
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return t;
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}
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/* see inner.h */
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size_t
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br_asn1_encode_length(void *dest, size_t len)
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{
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unsigned char *buf;
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size_t z;
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int i, j;
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buf = dest;
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if (len < 0x80) {
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if (buf != NULL) {
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*buf = len;
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}
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return 1;
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}
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i = 0;
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for (z = len; z != 0; z >>= 8) {
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i ++;
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}
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if (buf != NULL) {
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*buf ++ = 0x80 + i;
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for (j = i - 1; j >= 0; j --) {
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*buf ++ = len >> (j << 3);
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}
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}
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return i + 1;
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}
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/* see inner.h */
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size_t
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br_asn1_encode_uint(void *dest, br_asn1_uint pp)
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{
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unsigned char *buf;
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size_t lenlen;
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if (dest == NULL) {
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return 1 + br_asn1_encode_length(NULL, pp.asn1len) + pp.asn1len;
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}
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buf = dest;
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*buf ++ = 0x02;
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lenlen = br_asn1_encode_length(buf, pp.asn1len);
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buf += lenlen;
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*buf = 0x00;
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memcpy(buf + pp.asn1len - pp.len, pp.data, pp.len);
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return 1 + lenlen + pp.asn1len;
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}
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