2 This file is part of systemd.
4 Copyright 2010 Lennart Poettering
6 systemd is free software; you can redistribute it and/or modify it
7 under the terms of the GNU Lesser General Public License as published by
8 the Free Software Foundation; either version 2.1 of the License, or
9 (at your option) any later version.
11 systemd is distributed in the hope that it will be useful, but
12 WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 Lesser General Public License for more details.
16 You should have received a copy of the GNU Lesser General Public License
17 along with systemd; If not, see <http://www.gnu.org/licenses/>.
25 #include "alloc-util.h"
26 #include "hexdecoct.h"
34 int unoctchar(char c) {
36 if (c >= '0' && c <= '7')
43 return '0' + (x % 10);
46 int undecchar(char c) {
48 if (c >= '0' && c <= '9')
55 static const char table[16] = "0123456789abcdef";
60 int unhexchar(char c) {
62 if (c >= '0' && c <= '9')
65 if (c >= 'a' && c <= 'f')
68 if (c >= 'A' && c <= 'F')
74 char *hexmem(const void *p, size_t l) {
78 z = r = new(char, l * 2 + 1);
82 for (x = p; x < (const uint8_t*) p + l; x++) {
83 *(z++) = hexchar(*x >> 4);
84 *(z++) = hexchar(*x & 15);
91 int unhexmem(const char *p, size_t l, void **mem, size_t *len) {
92 _cleanup_free_ uint8_t *r = NULL;
103 z = r = malloc((l + 1) / 2 + 1);
107 for (x = p; x < p + l; x += 2) {
118 *(z++) = (uint8_t) a << 4 | (uint8_t) b;
130 /* https://tools.ietf.org/html/rfc4648#section-6
131 * Notice that base32hex differs from base32 in the alphabet it uses.
132 * The distinction is that the base32hex representation preserves the
133 * order of the underlying data when compared as bytestrings, this is
134 * useful when representing NSEC3 hashes, as one can then verify the
135 * order of hashes directly from their representation. */
136 char base32hexchar(int x) {
137 static const char table[32] = "0123456789"
138 "ABCDEFGHIJKLMNOPQRSTUV";
140 return table[x & 31];
143 int unbase32hexchar(char c) {
146 if (c >= '0' && c <= '9')
149 offset = '9' - '0' + 1;
151 if (c >= 'A' && c <= 'V')
152 return c - 'A' + offset;
157 char *base32hexmem(const void *p, size_t l, bool padding) {
163 /* five input bytes makes eight output bytes, padding is added so we must round up */
164 len = 8 * (l + 4) / 5;
166 /* same, but round down as there is no padding */
185 z = r = malloc(len + 1);
189 for (x = p; x < (const uint8_t*) p + (l / 5) * 5; x += 5) {
190 /* x[0] == XXXXXXXX; x[1] == YYYYYYYY; x[2] == ZZZZZZZZ
191 x[3] == QQQQQQQQ; x[4] == WWWWWWWW */
192 *(z++) = base32hexchar(x[0] >> 3); /* 000XXXXX */
193 *(z++) = base32hexchar((x[0] & 7) << 2 | x[1] >> 6); /* 000XXXYY */
194 *(z++) = base32hexchar((x[1] & 63) >> 1); /* 000YYYYY */
195 *(z++) = base32hexchar((x[1] & 1) << 4 | x[2] >> 4); /* 000YZZZZ */
196 *(z++) = base32hexchar((x[2] & 15) << 1 | x[3] >> 7); /* 000ZZZZQ */
197 *(z++) = base32hexchar((x[3] & 127) >> 2); /* 000QQQQQ */
198 *(z++) = base32hexchar((x[3] & 3) << 3 | x[4] >> 5); /* 000QQWWW */
199 *(z++) = base32hexchar((x[4] & 31)); /* 000WWWWW */
204 *(z++) = base32hexchar(x[0] >> 3); /* 000XXXXX */
205 *(z++) = base32hexchar((x[0] & 7) << 2 | x[1] >> 6); /* 000XXXYY */
206 *(z++) = base32hexchar((x[1] & 63) >> 1); /* 000YYYYY */
207 *(z++) = base32hexchar((x[1] & 1) << 4 | x[2] >> 4); /* 000YZZZZ */
208 *(z++) = base32hexchar((x[2] & 15) << 1 | x[3] >> 7); /* 000ZZZZQ */
209 *(z++) = base32hexchar((x[3] & 127) >> 2); /* 000QQQQQ */
210 *(z++) = base32hexchar((x[3] & 3) << 3); /* 000QQ000 */
217 *(z++) = base32hexchar(x[0] >> 3); /* 000XXXXX */
218 *(z++) = base32hexchar((x[0] & 7) << 2 | x[1] >> 6); /* 000XXXYY */
219 *(z++) = base32hexchar((x[1] & 63) >> 1); /* 000YYYYY */
220 *(z++) = base32hexchar((x[1] & 1) << 4 | x[2] >> 4); /* 000YZZZZ */
221 *(z++) = base32hexchar((x[2] & 15) << 1); /* 000ZZZZ0 */
231 *(z++) = base32hexchar(x[0] >> 3); /* 000XXXXX */
232 *(z++) = base32hexchar((x[0] & 7) << 2 | x[1] >> 6); /* 000XXXYY */
233 *(z++) = base32hexchar((x[1] & 63) >> 1); /* 000YYYYY */
234 *(z++) = base32hexchar((x[1] & 1) << 4); /* 000Y0000 */
245 *(z++) = base32hexchar(x[0] >> 3); /* 000XXXXX */
246 *(z++) = base32hexchar((x[0] & 7) << 2); /* 000XXX00 */
263 int unbase32hexmem(const char *p, size_t l, bool padding, void **mem, size_t *_len) {
264 _cleanup_free_ uint8_t *r = NULL;
265 int a, b, c, d, e, f, g, h;
273 /* padding ensures any base32hex input has input divisible by 8 */
274 if (padding && l % 8 != 0)
278 /* strip the padding */
279 while (l > 0 && p[l - 1] == '=' && pad < 7) {
285 /* a group of eight input bytes needs five output bytes, in case of
286 padding we need to add some extra bytes */
308 z = r = malloc(len + 1);
312 for (x = p; x < p + (l / 8) * 8; x += 8) {
313 /* a == 000XXXXX; b == 000YYYYY; c == 000ZZZZZ; d == 000WWWWW
314 e == 000SSSSS; f == 000QQQQQ; g == 000VVVVV; h == 000RRRRR */
315 a = unbase32hexchar(x[0]);
319 b = unbase32hexchar(x[1]);
323 c = unbase32hexchar(x[2]);
327 d = unbase32hexchar(x[3]);
331 e = unbase32hexchar(x[4]);
335 f = unbase32hexchar(x[5]);
339 g = unbase32hexchar(x[6]);
343 h = unbase32hexchar(x[7]);
347 *(z++) = (uint8_t) a << 3 | (uint8_t) b >> 2; /* XXXXXYYY */
348 *(z++) = (uint8_t) b << 6 | (uint8_t) c << 1 | (uint8_t) d >> 4; /* YYZZZZZW */
349 *(z++) = (uint8_t) d << 4 | (uint8_t) e >> 1; /* WWWWSSSS */
350 *(z++) = (uint8_t) e << 7 | (uint8_t) f << 2 | (uint8_t) g >> 3; /* SQQQQQVV */
351 *(z++) = (uint8_t) g << 5 | (uint8_t) h; /* VVVRRRRR */
356 a = unbase32hexchar(x[0]);
360 b = unbase32hexchar(x[1]);
364 c = unbase32hexchar(x[2]);
368 d = unbase32hexchar(x[3]);
372 e = unbase32hexchar(x[4]);
376 f = unbase32hexchar(x[5]);
380 g = unbase32hexchar(x[6]);
388 *(z++) = (uint8_t) a << 3 | (uint8_t) b >> 2; /* XXXXXYYY */
389 *(z++) = (uint8_t) b << 6 | (uint8_t) c << 1 | (uint8_t) d >> 4; /* YYZZZZZW */
390 *(z++) = (uint8_t) d << 4 | (uint8_t) e >> 1; /* WWWWSSSS */
391 *(z++) = (uint8_t) e << 7 | (uint8_t) f << 2 | (uint8_t) g >> 3; /* SQQQQQVV */
395 a = unbase32hexchar(x[0]);
399 b = unbase32hexchar(x[1]);
403 c = unbase32hexchar(x[2]);
407 d = unbase32hexchar(x[3]);
411 e = unbase32hexchar(x[4]);
419 *(z++) = (uint8_t) a << 3 | (uint8_t) b >> 2; /* XXXXXYYY */
420 *(z++) = (uint8_t) b << 6 | (uint8_t) c << 1 | (uint8_t) d >> 4; /* YYZZZZZW */
421 *(z++) = (uint8_t) d << 4 | (uint8_t) e >> 1; /* WWWWSSSS */
425 a = unbase32hexchar(x[0]);
429 b = unbase32hexchar(x[1]);
433 c = unbase32hexchar(x[2]);
437 d = unbase32hexchar(x[3]);
445 *(z++) = (uint8_t) a << 3 | (uint8_t) b >> 2; /* XXXXXYYY */
446 *(z++) = (uint8_t) b << 6 | (uint8_t) c << 1 | (uint8_t) d >> 4; /* YYZZZZZW */
450 a = unbase32hexchar(x[0]);
454 b = unbase32hexchar(x[1]);
462 *(z++) = (uint8_t) a << 3 | (uint8_t) b >> 2; /* XXXXXYYY */
480 /* https://tools.ietf.org/html/rfc4648#section-4 */
481 char base64char(int x) {
482 static const char table[64] = "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
483 "abcdefghijklmnopqrstuvwxyz"
485 return table[x & 63];
488 int unbase64char(char c) {
491 if (c >= 'A' && c <= 'Z')
494 offset = 'Z' - 'A' + 1;
496 if (c >= 'a' && c <= 'z')
497 return c - 'a' + offset;
499 offset += 'z' - 'a' + 1;
501 if (c >= '0' && c <= '9')
502 return c - '0' + offset;
504 offset += '9' - '0' + 1;
517 ssize_t base64mem(const void *p, size_t l, char **out) {
521 /* three input bytes makes four output bytes, padding is added so we must round up */
522 z = r = malloc(4 * (l + 2) / 3 + 1);
526 for (x = p; x < (const uint8_t*) p + (l / 3) * 3; x += 3) {
527 /* x[0] == XXXXXXXX; x[1] == YYYYYYYY; x[2] == ZZZZZZZZ */
528 *(z++) = base64char(x[0] >> 2); /* 00XXXXXX */
529 *(z++) = base64char((x[0] & 3) << 4 | x[1] >> 4); /* 00XXYYYY */
530 *(z++) = base64char((x[1] & 15) << 2 | x[2] >> 6); /* 00YYYYZZ */
531 *(z++) = base64char(x[2] & 63); /* 00ZZZZZZ */
536 *(z++) = base64char(x[0] >> 2); /* 00XXXXXX */
537 *(z++) = base64char((x[0] & 3) << 4 | x[1] >> 4); /* 00XXYYYY */
538 *(z++) = base64char((x[1] & 15) << 2); /* 00YYYY00 */
543 *(z++) = base64char(x[0] >> 2); /* 00XXXXXX */
544 *(z++) = base64char((x[0] & 3) << 4); /* 00XX0000 */
556 static int base64_append_width(char **prefix, int plen,
557 const char *sep, int indent,
558 const void *p, size_t l,
561 _cleanup_free_ char *x = NULL;
563 ssize_t slen, len, avail;
566 len = base64mem(p, l, &x);
570 lines = (len + width - 1) / width;
572 slen = sep ? strlen(sep) : 0;
573 t = realloc(*prefix, plen + 1 + slen + (indent + width + 1) * lines);
577 memcpy_safe(t + plen, sep, slen);
579 for (line = 0, s = t + plen + slen, avail = len; line < lines; line++) {
580 int act = MIN(width, avail);
582 if (line > 0 || sep) {
583 memset(s, ' ', indent);
587 memcpy(s, x + width * line, act);
589 *(s++) = line < lines - 1 ? '\n' : '\0';
598 int base64_append(char **prefix, int plen,
599 const void *p, size_t l,
600 int indent, int width) {
601 if (plen > width / 2 || plen + indent > width)
602 /* leave indent on the left, keep last column free */
603 return base64_append_width(prefix, plen, "\n", indent, p, l, width - indent - 1);
605 /* leave plen on the left, keep last column free */
606 return base64_append_width(prefix, plen, NULL, plen, p, l, width - plen - 1);
610 int unbase64mem(const char *p, size_t l, void **mem, size_t *_len) {
611 _cleanup_free_ uint8_t *r = NULL;
619 /* padding ensures any base63 input has input divisible by 4 */
623 /* strip the padding */
624 if (l > 0 && p[l - 1] == '=')
626 if (l > 0 && p[l - 1] == '=')
629 /* a group of four input bytes needs three output bytes, in case of
630 padding we need to add two or three extra bytes */
631 len = (l / 4) * 3 + (l % 4 ? (l % 4) - 1 : 0);
633 z = r = malloc(len + 1);
637 for (x = p; x < p + (l / 4) * 4; x += 4) {
638 /* a == 00XXXXXX; b == 00YYYYYY; c == 00ZZZZZZ; d == 00WWWWWW */
639 a = unbase64char(x[0]);
643 b = unbase64char(x[1]);
647 c = unbase64char(x[2]);
651 d = unbase64char(x[3]);
655 *(z++) = (uint8_t) a << 2 | (uint8_t) b >> 4; /* XXXXXXYY */
656 *(z++) = (uint8_t) b << 4 | (uint8_t) c >> 2; /* YYYYZZZZ */
657 *(z++) = (uint8_t) c << 6 | (uint8_t) d; /* ZZWWWWWW */
662 a = unbase64char(x[0]);
666 b = unbase64char(x[1]);
670 c = unbase64char(x[2]);
678 *(z++) = (uint8_t) a << 2 | (uint8_t) b >> 4; /* XXXXXXYY */
679 *(z++) = (uint8_t) b << 4 | (uint8_t) c >> 2; /* YYYYZZZZ */
683 a = unbase64char(x[0]);
687 b = unbase64char(x[1]);
695 *(z++) = (uint8_t) a << 2 | (uint8_t) (b >> 4); /* XXXXXXYY */
714 void hexdump(FILE *f, const void *p, size_t s) {
715 const uint8_t *b = p;
723 fprintf(f, "%04x ", n);
725 for (i = 0; i < 16; i++) {
730 fprintf(f, "%02x ", b[i]);
738 for (i = 0; i < 16; i++) {
743 fputc(isprint(b[i]) ? (char) b[i] : '.', f);