/***
This file is part of systemd.
Copyright 2010 Lennart Poettering
systemd is free software; you can redistribute it and/or modify it
under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 2.1 of the License, or
(at your option) any later version.
systemd 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with systemd; If not, see <http://www.gnu.org/licenses/>.
***/
#include <ctype.h>
#include <errno.h>
#include <stdint.h>
#include <stdlib.h>
#include "alloc-util.h"
#include "hexdecoct.h"
#include "macro.h"
char octchar(int x) {
return '0' + (x & 7);
}
int unoctchar(char c) {
if (c >= '0' && c <= '7')
return c - '0';
return -EINVAL;
}
char decchar(int x) {
return '0' + (x % 10);
}
int undecchar(char c) {
if (c >= '0' && c <= '9')
return c - '0';
return -EINVAL;
}
char hexchar(int x) {
static const char table[16] = "0123456789abcdef";
return table[x & 15];
}
int unhexchar(char c) {
if (c >= '0' && c <= '9')
return c - '0';
if (c >= 'a' && c <= 'f')
return c - 'a' + 10;
if (c >= 'A' && c <= 'F')
return c - 'A' + 10;
return -EINVAL;
}
char *hexmem(const void *p, size_t l) {
char *r, *z;
const uint8_t *x;
z = r = malloc(l * 2 + 1);
if (!r)
return NULL;
for (x = p; x < (const uint8_t*) p + l; x++) {
*(z++) = hexchar(*x >> 4);
*(z++) = hexchar(*x & 15);
}
*z = 0;
return r;
}
int unhexmem(const char *p, size_t l, void **mem, size_t *len) {
_cleanup_free_ uint8_t *r = NULL;
uint8_t *z;
const char *x;
assert(mem);
assert(len);
assert(p);
z = r = malloc((l + 1) / 2 + 1);
if (!r)
return -ENOMEM;
for (x = p; x < p + l; x += 2) {
int a, b;
a = unhexchar(x[0]);
if (a < 0)
return a;
else if (x+1 < p + l) {
b = unhexchar(x[1]);
if (b < 0)
return b;
} else
b = 0;
*(z++) = (uint8_t) a << 4 | (uint8_t) b;
}
*z = 0;
*mem = r;
r = NULL;
*len = (l + 1) / 2;
return 0;
}
/* https://tools.ietf.org/html/rfc4648#section-6
* Notice that base32hex differs from base32 in the alphabet it uses.
* The distinction is that the base32hex representation preserves the
* order of the underlying data when compared as bytestrings, this is
* useful when representing NSEC3 hashes, as one can then verify the
* order of hashes directly from their representation. */
char base32hexchar(int x) {
static const char table[32] = "0123456789"
"ABCDEFGHIJKLMNOPQRSTUV";
return table[x & 31];
}
int unbase32hexchar(char c) {
unsigned offset;
if (c >= '0' && c <= '9')
return c - '0';
offset = '9' - '0' + 1;
if (c >= 'A' && c <= 'V')
return c - 'A' + offset;
return -EINVAL;
}
char *base32hexmem(const void *p, size_t l, bool padding) {
char *r, *z;
const uint8_t *x;
size_t len;
if (padding)
/* five input bytes makes eight output bytes, padding is added so we must round up */
len = 8 * (l + 4) / 5;
else {
/* same, but round down as there is no padding */
len = 8 * l / 5;
switch (l % 5) {
case 4:
len += 7;
break;
case 3:
len += 5;
break;
case 2:
len += 4;
break;
case 1:
len += 2;
break;
}
}
z = r = malloc(len + 1);
if (!r)
return NULL;
for (x = p; x < (const uint8_t*) p + (l / 5) * 5; x += 5) {
/* x[0] == XXXXXXXX; x[1] == YYYYYYYY; x[2] == ZZZZZZZZ
x[3] == QQQQQQQQ; x[4] == WWWWWWWW */
*(z++) = base32hexchar(x[0] >> 3); /* 000XXXXX */
*(z++) = base32hexchar((x[0] & 7) << 2 | x[1] >> 6); /* 000XXXYY */
*(z++) = base32hexchar((x[1] & 63) >> 1); /* 000YYYYY */
*(z++) = base32hexchar((x[1] & 1) << 4 | x[2] >> 4); /* 000YZZZZ */
*(z++) = base32hexchar((x[2] & 15) << 1 | x[3] >> 7); /* 000ZZZZQ */
*(z++) = base32hexchar((x[3] & 127) >> 2); /* 000QQQQQ */
*(z++) = base32hexchar((x[3] & 3) << 3 | x[4] >> 5); /* 000QQWWW */
*(z++) = base32hexchar((x[4] & 31)); /* 000WWWWW */
}
switch (l % 5) {
case 4:
*(z++) = base32hexchar(x[0] >> 3); /* 000XXXXX */
*(z++) = base32hexchar((x[0] & 7) << 2 | x[1] >> 6); /* 000XXXYY */
*(z++) = base32hexchar((x[1] & 63) >> 1); /* 000YYYYY */
*(z++) = base32hexchar((x[1] & 1) << 4 | x[2] >> 4); /* 000YZZZZ */
*(z++) = base32hexchar((x[2] & 15) << 1 | x[3] >> 7); /* 000ZZZZQ */
*(z++) = base32hexchar((x[3] & 127) >> 2); /* 000QQQQQ */
*(z++) = base32hexchar((x[3] & 3) << 3); /* 000QQ000 */
if (padding)
*(z++) = '=';
break;
case 3:
*(z++) = base32hexchar(x[0] >> 3); /* 000XXXXX */
*(z++) = base32hexchar((x[0] & 7) << 2 | x[1] >> 6); /* 000XXXYY */
*(z++) = base32hexchar((x[1] & 63) >> 1); /* 000YYYYY */
*(z++) = base32hexchar((x[1] & 1) << 4 | x[2] >> 4); /* 000YZZZZ */
*(z++) = base32hexchar((x[2] & 15) << 1); /* 000ZZZZ0 */
if (padding) {
*(z++) = '=';
*(z++) = '=';
*(z++) = '=';
}
break;
case 2:
*(z++) = base32hexchar(x[0] >> 3); /* 000XXXXX */
*(z++) = base32hexchar((x[0] & 7) << 2 | x[1] >> 6); /* 000XXXYY */
*(z++) = base32hexchar((x[1] & 63) >> 1); /* 000YYYYY */
*(z++) = base32hexchar((x[1] & 1) << 4); /* 000Y0000 */
if (padding) {
*(z++) = '=';
*(z++) = '=';
*(z++) = '=';
*(z++) = '=';
}
break;
case 1:
*(z++) = base32hexchar(x[0] >> 3); /* 000XXXXX */
*(z++) = base32hexchar((x[0] & 7) << 2); /* 000XXX00 */
if (padding) {
*(z++) = '=';
*(z++) = '=';
*(z++) = '=';
*(z++) = '=';
*(z++) = '=';
*(z++) = '=';
}
break;
}
*z = 0;
return r;
}
int unbase32hexmem(const char *p, size_t l, bool padding, void **mem, size_t *_len) {
_cleanup_free_ uint8_t *r = NULL;
int a, b, c, d, e, f, g, h;
uint8_t *z;
const char *x;
size_t len;
unsigned pad = 0;
assert(p);
/* padding ensures any base32hex input has input divisible by 8 */
if (padding && l % 8 != 0)
return -EINVAL;
if (padding) {
/* strip the padding */
while (l > 0 && p[l - 1] == '=' && pad < 7) {
pad ++;
l --;
}
}
/* a group of eight input bytes needs five output bytes, in case of
padding we need to add some extra bytes */
len = (l / 8) * 5;
switch (l % 8) {
case 7:
len += 4;
break;
case 5:
len += 3;
break;
case 4:
len += 2;
break;
case 2:
len += 1;
break;
case 0:
break;
default:
return -EINVAL;
}
z = r = malloc(len + 1);
if (!r)
return -ENOMEM;
for (x = p; x < p + (l / 8) * 8; x += 8) {
/* a == 000XXXXX; b == 000YYYYY; c == 000ZZZZZ; d == 000WWWWW
e == 000SSSSS; f == 000QQQQQ; g == 000VVVVV; h == 000RRRRR */
a = unbase32hexchar(x[0]);
if (a < 0)
return -EINVAL;
b = unbase32hexchar(x[1]);
if (b < 0)
return -EINVAL;
c = unbase32hexchar(x[2]);
if (c < 0)
return -EINVAL;
d = unbase32hexchar(x[3]);
if (d < 0)
return -EINVAL;
e = unbase32hexchar(x[4]);
if (e < 0)
return -EINVAL;
f = unbase32hexchar(x[5]);
if (f < 0)
return -EINVAL;
g = unbase32hexchar(x[6]);
if (g < 0)
return -EINVAL;
h = unbase32hexchar(x[7]);
if (h < 0)
return -EINVAL;
*(z++) = (uint8_t) a << 3 | (uint8_t) b >> 2; /* XXXXXYYY */
*(z++) = (uint8_t) b << 6 | (uint8_t) c << 1 | (uint8_t) d >> 4; /* YYZZZZZW */
*(z++) = (uint8_t) d << 4 | (uint8_t) e >> 1; /* WWWWSSSS */
*(z++) = (uint8_t) e << 7 | (uint8_t) f << 2 | (uint8_t) g >> 3; /* SQQQQQVV */
*(z++) = (uint8_t) g << 5 | (uint8_t) h; /* VVVRRRRR */
}
switch (l % 8) {
case 7:
a = unbase32hexchar(x[0]);
if (a < 0)
return -EINVAL;
b = unbase32hexchar(x[1]);
if (b < 0)
return -EINVAL;
c = unbase32hexchar(x[2]);
if (c < 0)
return -EINVAL;
d = unbase32hexchar(x[3]);
if (d < 0)
return -EINVAL;
e = unbase32hexchar(x[4]);
if (e < 0)
return -EINVAL;
f = unbase32hexchar(x[5]);
if (f < 0)
return -EINVAL;
g = unbase32hexchar(x[6]);
if (g < 0)
return -EINVAL;
/* g == 000VV000 */
if (g & 7)
return -EINVAL;
*(z++) = (uint8_t) a << 3 | (uint8_t) b >> 2; /* XXXXXYYY */
*(z++) = (uint8_t) b << 6 | (uint8_t) c << 1 | (uint8_t) d >> 4; /* YYZZZZZW */
*(z++) = (uint8_t) d << 4 | (uint8_t) e >> 1; /* WWWWSSSS */
*(z++) = (uint8_t) e << 7 | (uint8_t) f << 2 | (uint8_t) g >> 3; /* SQQQQQVV */
break;
case 5:
a = unbase32hexchar(x[0]);
if (a < 0)
return -EINVAL;
b = unbase32hexchar(x[1]);
if (b < 0)
return -EINVAL;
c = unbase32hexchar(x[2]);
if (c < 0)
return -EINVAL;
d = unbase32hexchar(x[3]);
if (d < 0)
return -EINVAL;
e = unbase32hexchar(x[4]);
if (e < 0)
return -EINVAL;
/* e == 000SSSS0 */
if (e & 1)
return -EINVAL;
*(z++) = (uint8_t) a << 3 | (uint8_t) b >> 2; /* XXXXXYYY */
*(z++) = (uint8_t) b << 6 | (uint8_t) c << 1 | (uint8_t) d >> 4; /* YYZZZZZW */
*(z++) = (uint8_t) d << 4 | (uint8_t) e >> 1; /* WWWWSSSS */
break;
case 4:
a = unbase32hexchar(x[0]);
if (a < 0)
return -EINVAL;
b = unbase32hexchar(x[1]);
if (b < 0)
return -EINVAL;
c = unbase32hexchar(x[2]);
if (c < 0)
return -EINVAL;
d = unbase32hexchar(x[3]);
if (d < 0)
return -EINVAL;
/* d == 000W0000 */
if (d & 15)
return -EINVAL;
*(z++) = (uint8_t) a << 3 | (uint8_t) b >> 2; /* XXXXXYYY */
*(z++) = (uint8_t) b << 6 | (uint8_t) c << 1 | (uint8_t) d >> 4; /* YYZZZZZW */
break;
case 2:
a = unbase32hexchar(x[0]);
if (a < 0)
return -EINVAL;
b = unbase32hexchar(x[1]);
if (b < 0)
return -EINVAL;
/* b == 000YYY00 */
if (b & 3)
return -EINVAL;
*(z++) = (uint8_t) a << 3 | (uint8_t) b >> 2; /* XXXXXYYY */
break;
case 0:
break;
default:
return -EINVAL;
}
*z = 0;
*mem = r;
r = NULL;
*_len = len;
return 0;
}
/* https://tools.ietf.org/html/rfc4648#section-4 */
char base64char(int x) {
static const char table[64] = "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
"abcdefghijklmnopqrstuvwxyz"
"0123456789+/";
return table[x & 63];
}
int unbase64char(char c) {
unsigned offset;
if (c >= 'A' && c <= 'Z')
return c - 'A';
offset = 'Z' - 'A' + 1;
if (c >= 'a' && c <= 'z')
return c - 'a' + offset;
offset += 'z' - 'a' + 1;
if (c >= '0' && c <= '9')
return c - '0' + offset;
offset += '9' - '0' + 1;
if (c == '+')
return offset;
offset ++;
if (c == '/')
return offset;
return -EINVAL;
}
ssize_t base64mem(const void *p, size_t l, char **out) {
char *r, *z;
const uint8_t *x;
/* three input bytes makes four output bytes, padding is added so we must round up */
z = r = malloc(4 * (l + 2) / 3 + 1);
if (!r)
return -ENOMEM;
for (x = p; x < (const uint8_t*) p + (l / 3) * 3; x += 3) {
/* x[0] == XXXXXXXX; x[1] == YYYYYYYY; x[2] == ZZZZZZZZ */
*(z++) = base64char(x[0] >> 2); /* 00XXXXXX */
*(z++) = base64char((x[0] & 3) << 4 | x[1] >> 4); /* 00XXYYYY */
*(z++) = base64char((x[1] & 15) << 2 | x[2] >> 6); /* 00YYYYZZ */
*(z++) = base64char(x[2] & 63); /* 00ZZZZZZ */
}
switch (l % 3) {
case 2:
*(z++) = base64char(x[0] >> 2); /* 00XXXXXX */
*(z++) = base64char((x[0] & 3) << 4 | x[1] >> 4); /* 00XXYYYY */
*(z++) = base64char((x[1] & 15) << 2); /* 00YYYY00 */
*(z++) = '=';
break;
case 1:
*(z++) = base64char(x[0] >> 2); /* 00XXXXXX */
*(z++) = base64char((x[0] & 3) << 4); /* 00XX0000 */
*(z++) = '=';
*(z++) = '=';
break;
}
*z = 0;
*out = r;
return z - r;
}
static int base64_append_width(char **prefix, int plen,
const char *sep, int indent,
const void *p, size_t l,
int width) {
_cleanup_free_ char *x = NULL;
char *t, *s;
ssize_t slen, len, avail;
int line, lines;
len = base64mem(p, l, &x);
if (len <= 0)
return len;
lines = (len + width - 1) / width;
slen = sep ? strlen(sep) : 0;
t = realloc(*prefix, plen + 1 + slen + (indent + width + 1) * lines);
if (!t)
return -ENOMEM;
memcpy(t + plen, sep, slen);
for (line = 0, s = t + plen + slen, avail = len; line < lines; line++) {
int act = MIN(width, avail);
if (line > 0 || sep) {
memset(s, ' ', indent);
s += indent;
}
memcpy(s, x + width * line, act);
s += act;
*(s++) = line < lines - 1 ? '\n' : '\0';
avail -= act;
}
assert(avail == 0);
*prefix = t;
return 0;
}
int base64_append(char **prefix, int plen,
const void *p, size_t l,
int indent, int width) {
if (plen > width / 2 || plen + indent > width)
/* leave indent on the left, keep last column free */
return base64_append_width(prefix, plen, "\n", indent, p, l, width - indent - 1);
else
/* leave plen on the left, keep last column free */
return base64_append_width(prefix, plen, NULL, plen, p, l, width - plen - 1);
};
int unbase64mem(const char *p, size_t l, void **mem, size_t *_len) {
_cleanup_free_ uint8_t *r = NULL;
int a, b, c, d;
uint8_t *z;
const char *x;
size_t len;
assert(p);
/* padding ensures any base63 input has input divisible by 4 */
if (l % 4 != 0)
return -EINVAL;
/* strip the padding */
if (l > 0 && p[l - 1] == '=')
l --;
if (l > 0 && p[l - 1] == '=')
l --;
/* a group of four input bytes needs three output bytes, in case of
padding we need to add two or three extra bytes */
len = (l / 4) * 3 + (l % 4 ? (l % 4) - 1 : 0);
z = r = malloc(len + 1);
if (!r)
return -ENOMEM;
for (x = p; x < p + (l / 4) * 4; x += 4) {
/* a == 00XXXXXX; b == 00YYYYYY; c == 00ZZZZZZ; d == 00WWWWWW */
a = unbase64char(x[0]);
if (a < 0)
return -EINVAL;
b = unbase64char(x[1]);
if (b < 0)
return -EINVAL;
c = unbase64char(x[2]);
if (c < 0)
return -EINVAL;
d = unbase64char(x[3]);
if (d < 0)
return -EINVAL;
*(z++) = (uint8_t) a << 2 | (uint8_t) b >> 4; /* XXXXXXYY */
*(z++) = (uint8_t) b << 4 | (uint8_t) c >> 2; /* YYYYZZZZ */
*(z++) = (uint8_t) c << 6 | (uint8_t) d; /* ZZWWWWWW */
}
switch (l % 4) {
case 3:
a = unbase64char(x[0]);
if (a < 0)
return -EINVAL;
b = unbase64char(x[1]);
if (b < 0)
return -EINVAL;
c = unbase64char(x[2]);
if (c < 0)
return -EINVAL;
/* c == 00ZZZZ00 */
if (c & 3)
return -EINVAL;
*(z++) = (uint8_t) a << 2 | (uint8_t) b >> 4; /* XXXXXXYY */
*(z++) = (uint8_t) b << 4 | (uint8_t) c >> 2; /* YYYYZZZZ */
break;
case 2:
a = unbase64char(x[0]);
if (a < 0)
return -EINVAL;
b = unbase64char(x[1]);
if (b < 0)
return -EINVAL;
/* b == 00YY0000 */
if (b & 15)
return -EINVAL;
*(z++) = (uint8_t) a << 2 | (uint8_t) (b >> 4); /* XXXXXXYY */
break;
case 0:
break;
default:
return -EINVAL;
}
*z = 0;
*mem = r;
r = NULL;
*_len = len;
return 0;
}
void hexdump(FILE *f, const void *p, size_t s) {
const uint8_t *b = p;
unsigned n = 0;
assert(s == 0 || b);
while (s > 0) {
size_t i;
fprintf(f, "%04x ", n);
for (i = 0; i < 16; i++) {
if (i >= s)
fputs(" ", f);
else
fprintf(f, "%02x ", b[i]);
if (i == 7)
fputc(' ', f);
}
fputc(' ', f);
for (i = 0; i < 16; i++) {
if (i >= s)
fputc(' ', f);
else
fputc(isprint(b[i]) ? (char) b[i] : '.', f);
}
fputc('\n', f);
if (s < 16)
break;
n += 16;
b += 16;
s -= 16;
}
}