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common: Add z-base-32 encoder.
* common/zb32.c: New. * common/t-zb32.c: New. * common/Makefile.am (common_sources): Add zb82.c (module_tests): Add t-zb32.
This commit is contained in:
Werner Koch
parent
a34afa8f20
commit
b8a91ebf46
@ -72,7 +72,7 @@ common_sources = \
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homedir.c \
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gettime.c gettime.h \
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yesno.c \
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b64enc.c b64dec.c \
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b64enc.c b64dec.c zb32.c \
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convert.c \
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percent.c \
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miscellaneous.c \
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@ -166,7 +166,7 @@ jnlib_tests += t-w32-reg
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endif
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module_tests = t-convert t-percent t-gettime t-sysutils t-sexputil \
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t-session-env t-openpgp-oid t-ssh-utils t-dns-cert \
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t-mapstrings
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t-mapstrings t-zb32
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if !HAVE_W32CE_SYSTEM
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module_tests += t-exechelp
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endif
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@ -202,3 +202,4 @@ t_openpgp_oid_LDADD = $(t_common_ldadd)
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t_ssh_utils_LDADD = $(t_common_ldadd)
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t_dns_cert_LDADD = $(t_common_ldadd) $(DNSLIBS)
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t_mapstrings_LDADD = $(t_common_ldadd)
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t_zb32_LDADD = $(t_common_ldadd)
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110
common/t-zb32.c
Normal file
110
common/t-zb32.c
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@ -0,0 +1,110 @@
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/* t-zb32.c - Module tests for zb32.c
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* Copyright (C) 2014 Werner Koch
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*
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* This file is part of GnuPG.
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*
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* This file is free software; you can redistribute it and/or modify
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* it under the terms of either
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*
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* - the GNU Lesser General Public License as published by the Free
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* Software Foundation; either version 3 of the License, or (at
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* your option) any later version.
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*
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* or
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*
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* - the GNU General Public License as published by the Free
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* Software Foundation; either version 2 of the License, or (at
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* your option) any later version.
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*
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* or both in parallel, as here.
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*
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* This file is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, see <http://www.gnu.org/licenses/>.
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*/
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#include <config.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <sys/stat.h>
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#include <unistd.h>
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#include "util.h"
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#define pass() do { ; } while(0)
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#define fail(a) do { fprintf (stderr, "%s:%d: test %d failed\n",\
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__FILE__,__LINE__, (a)); \
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errcount++; \
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} while(0)
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static int errcount;
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static void
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test_zb32enc (void)
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{
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static struct {
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size_t datalen;
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char *data;
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const char *expected;
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} tests[] = {
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/* From the DESIGN document. */
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{ 1, "\x00", "y" },
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{ 1, "\x80", "o" },
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{ 2, "\x40", "e" },
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{ 2, "\xc0", "a" },
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{ 10, "\x00\x00", "yy" },
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{ 10, "\x80\x80", "on" },
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{ 20, "\x8b\x88\x80", "tqre" },
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{ 24, "\xf0\xbf\xc7", "6n9hq" },
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{ 24, "\xd4\x7a\x04", "4t7ye" },
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/* The next vector is strange: The DESIGN document from 2007 gives
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"8ik66o" as result, the revision from 2009 gives "6im5sd". I
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look at it for quite some time and came to the conclusion that
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"6im54d" is the right encoding. */
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{ 30, "\xf5\x57\xbd\x0c", "6im54d" },
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/* From ccrtp's Java code. */
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{ 40, "\x01\x01\x01\x01\x01", "yryonyeb" },
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{ 15, "\x01\x01", "yry" },
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{ 80, "\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01", "yryonyebyryonyeb" },
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{ 15, "\x81\x81", "ogy" },
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{ 16, "\x81\x81", "ogyo" },
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{ 20, "\x81\x81\x81", "ogya" },
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{ 64, "\x81\x81\x81\x81\x81\x81\x81\x81", "ogyadycbogyan" },
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/* More tests. */
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{ 0, "", "" }
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};
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int tidx;
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char *output;
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for (tidx = 0; tidx < DIM(tests); tidx++)
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{
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output = zb32_encode (tests[tidx].data, tests[tidx].datalen);
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if (!output)
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{
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fprintf (stderr, "%s:%d: error encoding test %d: %s\n",
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__FILE__, __LINE__, tidx, strerror (errno));
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exit (1);
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}
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/* puts (output); */
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if (strcmp (output, tests[tidx].expected))
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fail (tidx);
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xfree (output);
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}
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}
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int
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main (int argc, char **argv)
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{
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(void)argc;
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(void)argv;
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test_zb32enc ();
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return !!errcount;
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}
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@ -164,6 +164,8 @@ gpg_error_t b64dec_proc (struct b64state *state, void *buffer, size_t length,
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gpg_error_t b64dec_finish (struct b64state *state);
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/*-- zb32.c --*/
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char *zb32_encode (const void *data, unsigned int databits);
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/*-- sexputil.c */
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120
common/zb32.c
Normal file
120
common/zb32.c
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@ -0,0 +1,120 @@
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/* zb32.c - z-base-32 functions
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* Copyright (C) 2014 Werner Koch
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*
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* This file is part of GnuPG.
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*
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* This file is free software; you can redistribute it and/or modify
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* it under the terms of either
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*
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* - the GNU Lesser General Public License as published by the Free
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* Software Foundation; either version 3 of the License, or (at
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* your option) any later version.
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*
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* or
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*
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* - the GNU General Public License as published by the Free
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* Software Foundation; either version 2 of the License, or (at
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* your option) any later version.
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*
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* or both in parallel, as here.
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*
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* This file is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, see <http://www.gnu.org/licenses/>.
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*/
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#include <config.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <errno.h>
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#include <assert.h>
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#include "util.h"
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/* Zooko's base32 variant. See RFC-6189 and
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http://philzimmermann.com/docs/human-oriented-base-32-encoding.txt
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Caller must xfree the returned string. Returns NULL and sets ERRNO
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on error. To avoid integer overflow DATALEN is limited to 2^16
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bytes. Note, that DATABITS is measured in bits!. */
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char *
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zb32_encode (const void *data, unsigned int databits)
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{
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static char const zb32asc[32] = {'y','b','n','d','r','f','g','8',
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'e','j','k','m','c','p','q','x',
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'o','t','1','u','w','i','s','z',
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'a','3','4','5','h','7','6','9' };
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const unsigned char *s;
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char *output, *d;
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size_t datalen;
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datalen = (databits + 7) / 8;
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if (datalen > (1 << 16))
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{
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errno = EINVAL;
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return NULL;
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}
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d = output = xtrymalloc (8 * (datalen / 5)
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+ 2 * (datalen % 5)
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- ((datalen%5)>2)
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+ 1);
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if (!output)
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return NULL;
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/* I use straightforward code. The compiler should be able to do a
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better job on optimization than me and it is easier to read. */
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for (s = data; datalen >= 5; s += 5, datalen -= 5)
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{
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*d++ = zb32asc[((s[0] ) >> 3) ];
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*d++ = zb32asc[((s[0] & 7) << 2) | (s[1] >> 6) ];
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*d++ = zb32asc[((s[1] & 63) >> 1) ];
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*d++ = zb32asc[((s[1] & 1) << 4) | (s[2] >> 4) ];
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*d++ = zb32asc[((s[2] & 15) << 1) | (s[3] >> 7) ];
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*d++ = zb32asc[((s[3] & 127) >> 2) ];
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*d++ = zb32asc[((s[3] & 3) << 3) | (s[4] >> 5) ];
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*d++ = zb32asc[((s[4] & 31) ) ];
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}
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switch (datalen)
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{
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case 4:
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*d++ = zb32asc[((s[0] ) >> 3) ];
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*d++ = zb32asc[((s[0] & 7) << 2) | (s[1] >> 6) ];
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*d++ = zb32asc[((s[1] & 63) >> 1) ];
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*d++ = zb32asc[((s[1] & 1) << 4) | (s[2] >> 4) ];
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*d++ = zb32asc[((s[2] & 15) << 1) | (s[3] >> 7) ];
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*d++ = zb32asc[((s[3] & 127) >> 2) ];
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*d++ = zb32asc[((s[3] & 3) << 3) ];
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break;
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case 3:
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*d++ = zb32asc[((s[0] ) >> 3) ];
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*d++ = zb32asc[((s[0] & 7) << 2) | (s[1] >> 6) ];
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*d++ = zb32asc[((s[1] & 63) >> 1) ];
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*d++ = zb32asc[((s[1] & 1) << 4) | (s[2] >> 4) ];
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*d++ = zb32asc[((s[2] & 15) << 1) ];
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break;
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case 2:
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*d++ = zb32asc[((s[0] ) >> 3) ];
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*d++ = zb32asc[((s[0] & 7) << 2) | (s[1] >> 6) ];
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*d++ = zb32asc[((s[1] & 63) >> 1) ];
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*d++ = zb32asc[((s[1] & 1) << 4) ];
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break;
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case 1:
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*d++ = zb32asc[((s[0] ) >> 3) ];
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*d++ = zb32asc[((s[0] & 7) << 2) ];
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break;
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default:
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break;
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}
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*d = 0;
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/* Need to strip some bytes if not a multiple of 40. */
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output[(databits + 5 - 1) / 5] = 0;
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return output;
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}
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