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352 lines
11 KiB
C
352 lines
11 KiB
C
/* b64enc.c - Simple Base64 encoder.
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* Copyright (C) 2001, 2003, 2004, 2008 Free Software Foundation, Inc.
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*
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* This file is part of GnuPG.
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*
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* GnuPG is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 3 of the License, or
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* (at your option) any later version.
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*
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* GnuPG 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 "i18n.h"
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#include "util.h"
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#define B64ENC_DID_HEADER 1
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#define B64ENC_DID_TRAILER 2
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#define B64ENC_NO_LINEFEEDS 16
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#define B64ENC_USE_PGPCRC 32
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/* The base-64 character list */
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static unsigned char bintoasc[64] = "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
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"abcdefghijklmnopqrstuvwxyz"
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"0123456789+/";
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/* Stuff required to create the OpenPGP CRC. This crc_table has been
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created using this code:
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#include <stdio.h>
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#include <stdint.h>
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#define CRCPOLY 0x864CFB
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int
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main (void)
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{
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int i, j;
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uint32_t t;
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uint32_t crc_table[256];
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crc_table[0] = 0;
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for (i=j=0; j < 128; j++ )
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{
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t = crc_table[j];
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if ( (t & 0x00800000) )
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{
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t <<= 1;
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crc_table[i++] = t ^ CRCPOLY;
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crc_table[i++] = t;
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}
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else
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{
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t <<= 1;
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crc_table[i++] = t;
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crc_table[i++] = t ^ CRCPOLY;
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}
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}
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puts ("static const u32 crc_table[256] = {");
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for (i=j=0; i < 256; i++)
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{
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printf ("%s 0x%08lx", j? "":" ", (unsigned long)crc_table[i]);
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if (i != 255)
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{
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putchar (',');
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if ( ++j > 5)
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{
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j = 0;
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putchar ('\n');
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}
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}
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}
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puts ("\n};");
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return 0;
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}
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*/
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#define CRCINIT 0xB704CE
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static const u32 crc_table[256] = {
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0x00000000, 0x00864cfb, 0x018ad50d, 0x010c99f6, 0x0393e6e1, 0x0315aa1a,
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0x021933ec, 0x029f7f17, 0x07a18139, 0x0727cdc2, 0x062b5434, 0x06ad18cf,
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0x043267d8, 0x04b42b23, 0x05b8b2d5, 0x053efe2e, 0x0fc54e89, 0x0f430272,
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0x0e4f9b84, 0x0ec9d77f, 0x0c56a868, 0x0cd0e493, 0x0ddc7d65, 0x0d5a319e,
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0x0864cfb0, 0x08e2834b, 0x09ee1abd, 0x09685646, 0x0bf72951, 0x0b7165aa,
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0x0a7dfc5c, 0x0afbb0a7, 0x1f0cd1e9, 0x1f8a9d12, 0x1e8604e4, 0x1e00481f,
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0x1c9f3708, 0x1c197bf3, 0x1d15e205, 0x1d93aefe, 0x18ad50d0, 0x182b1c2b,
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0x192785dd, 0x19a1c926, 0x1b3eb631, 0x1bb8faca, 0x1ab4633c, 0x1a322fc7,
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0x10c99f60, 0x104fd39b, 0x11434a6d, 0x11c50696, 0x135a7981, 0x13dc357a,
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0x12d0ac8c, 0x1256e077, 0x17681e59, 0x17ee52a2, 0x16e2cb54, 0x166487af,
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0x14fbf8b8, 0x147db443, 0x15712db5, 0x15f7614e, 0x3e19a3d2, 0x3e9fef29,
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0x3f9376df, 0x3f153a24, 0x3d8a4533, 0x3d0c09c8, 0x3c00903e, 0x3c86dcc5,
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0x39b822eb, 0x393e6e10, 0x3832f7e6, 0x38b4bb1d, 0x3a2bc40a, 0x3aad88f1,
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0x3ba11107, 0x3b275dfc, 0x31dced5b, 0x315aa1a0, 0x30563856, 0x30d074ad,
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0x324f0bba, 0x32c94741, 0x33c5deb7, 0x3343924c, 0x367d6c62, 0x36fb2099,
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0x37f7b96f, 0x3771f594, 0x35ee8a83, 0x3568c678, 0x34645f8e, 0x34e21375,
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0x2115723b, 0x21933ec0, 0x209fa736, 0x2019ebcd, 0x228694da, 0x2200d821,
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0x230c41d7, 0x238a0d2c, 0x26b4f302, 0x2632bff9, 0x273e260f, 0x27b86af4,
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0x252715e3, 0x25a15918, 0x24adc0ee, 0x242b8c15, 0x2ed03cb2, 0x2e567049,
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0x2f5ae9bf, 0x2fdca544, 0x2d43da53, 0x2dc596a8, 0x2cc90f5e, 0x2c4f43a5,
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0x2971bd8b, 0x29f7f170, 0x28fb6886, 0x287d247d, 0x2ae25b6a, 0x2a641791,
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0x2b688e67, 0x2beec29c, 0x7c3347a4, 0x7cb50b5f, 0x7db992a9, 0x7d3fde52,
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0x7fa0a145, 0x7f26edbe, 0x7e2a7448, 0x7eac38b3, 0x7b92c69d, 0x7b148a66,
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0x7a181390, 0x7a9e5f6b, 0x7801207c, 0x78876c87, 0x798bf571, 0x790db98a,
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0x73f6092d, 0x737045d6, 0x727cdc20, 0x72fa90db, 0x7065efcc, 0x70e3a337,
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0x71ef3ac1, 0x7169763a, 0x74578814, 0x74d1c4ef, 0x75dd5d19, 0x755b11e2,
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0x77c46ef5, 0x7742220e, 0x764ebbf8, 0x76c8f703, 0x633f964d, 0x63b9dab6,
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0x62b54340, 0x62330fbb, 0x60ac70ac, 0x602a3c57, 0x6126a5a1, 0x61a0e95a,
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0x649e1774, 0x64185b8f, 0x6514c279, 0x65928e82, 0x670df195, 0x678bbd6e,
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0x66872498, 0x66016863, 0x6cfad8c4, 0x6c7c943f, 0x6d700dc9, 0x6df64132,
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0x6f693e25, 0x6fef72de, 0x6ee3eb28, 0x6e65a7d3, 0x6b5b59fd, 0x6bdd1506,
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0x6ad18cf0, 0x6a57c00b, 0x68c8bf1c, 0x684ef3e7, 0x69426a11, 0x69c426ea,
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0x422ae476, 0x42aca88d, 0x43a0317b, 0x43267d80, 0x41b90297, 0x413f4e6c,
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0x4033d79a, 0x40b59b61, 0x458b654f, 0x450d29b4, 0x4401b042, 0x4487fcb9,
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0x461883ae, 0x469ecf55, 0x479256a3, 0x47141a58, 0x4defaaff, 0x4d69e604,
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0x4c657ff2, 0x4ce33309, 0x4e7c4c1e, 0x4efa00e5, 0x4ff69913, 0x4f70d5e8,
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0x4a4e2bc6, 0x4ac8673d, 0x4bc4fecb, 0x4b42b230, 0x49ddcd27, 0x495b81dc,
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0x4857182a, 0x48d154d1, 0x5d26359f, 0x5da07964, 0x5cace092, 0x5c2aac69,
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0x5eb5d37e, 0x5e339f85, 0x5f3f0673, 0x5fb94a88, 0x5a87b4a6, 0x5a01f85d,
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0x5b0d61ab, 0x5b8b2d50, 0x59145247, 0x59921ebc, 0x589e874a, 0x5818cbb1,
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0x52e37b16, 0x526537ed, 0x5369ae1b, 0x53efe2e0, 0x51709df7, 0x51f6d10c,
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0x50fa48fa, 0x507c0401, 0x5542fa2f, 0x55c4b6d4, 0x54c82f22, 0x544e63d9,
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0x56d11cce, 0x56575035, 0x575bc9c3, 0x57dd8538
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};
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/* Prepare for base-64 writing to the stream FP. If TITLE is not NULL
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and not an empty string, this string will be used as the title for
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the armor lines, with TITLE being an empty string, we don't write
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the header lines and furthermore even don't write any linefeeds.
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If TITLE starts with "PGP " the OpenPGP CRC checksum will be
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written as well. With TITLE beeing NULL, we merely don't write
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header but make sure that lines are not too long. Note, that we
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don't write any output unless at least one byte get written using
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b64enc_write. */
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gpg_error_t
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b64enc_start (struct b64state *state, FILE *fp, const char *title)
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{
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memset (state, 0, sizeof *state);
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state->fp = fp;
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if (title && !*title)
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state->flags |= B64ENC_NO_LINEFEEDS;
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else if (title)
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{
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if (!strncmp (title, "PGP ", 4))
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{
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state->flags |= B64ENC_USE_PGPCRC;
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state->crc = CRCINIT;
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}
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state->title = xtrystrdup (title);
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if (!state->title)
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return gpg_error_from_syserror ();
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}
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return 0;
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}
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/* Write NBYTES from BUFFER to the Base 64 stream identified by
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STATE. With BUFFER and NBYTES being 0, merely do a fflush on the
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stream. */
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gpg_error_t
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b64enc_write (struct b64state *state, const void *buffer, size_t nbytes)
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{
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unsigned char radbuf[4];
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int idx, quad_count;
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const unsigned char *p;
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FILE *fp = state->fp;
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if (!nbytes)
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{
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if (buffer && fflush (fp))
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goto write_error;
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return 0;
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}
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if (!(state->flags & B64ENC_DID_HEADER))
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{
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if (state->title)
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{
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if ( fputs ("-----BEGIN ", fp) == EOF
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|| fputs (state->title, fp) == EOF
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|| fputs ("-----\n", fp) == EOF)
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goto write_error;
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if ( (state->flags & B64ENC_USE_PGPCRC)
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&& fputs ("\n", fp) == EOF)
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goto write_error;
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}
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state->flags |= B64ENC_DID_HEADER;
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}
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idx = state->idx;
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quad_count = state->quad_count;
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assert (idx < 4);
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memcpy (radbuf, state->radbuf, idx);
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if ( (state->flags & B64ENC_USE_PGPCRC) )
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{
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size_t n;
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u32 crc = state->crc;
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for (p=buffer, n=nbytes; n; p++, n-- )
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crc = (crc << 8) ^ crc_table[((crc >> 16)&0xff) ^ *p];
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state->crc = (crc & 0x00ffffff);
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}
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for (p=buffer; nbytes; p++, nbytes--)
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{
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radbuf[idx++] = *p;
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if (idx > 2)
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{
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char tmp[4];
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tmp[0] = bintoasc[(*radbuf >> 2) & 077];
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tmp[1] = bintoasc[(((*radbuf<<4)&060)|((radbuf[1] >> 4)&017))&077];
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tmp[2] = bintoasc[(((radbuf[1]<<2)&074)|((radbuf[2]>>6)&03))&077];
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tmp[3] = bintoasc[radbuf[2]&077];
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for (idx=0; idx < 4; idx++)
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putc (tmp[idx], fp);
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idx = 0;
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if (ferror (fp))
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goto write_error;
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if (++quad_count >= (64/4))
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{
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quad_count = 0;
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if (!(state->flags & B64ENC_NO_LINEFEEDS)
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&& fputs ("\n", fp) == EOF)
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goto write_error;
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}
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}
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}
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memcpy (state->radbuf, radbuf, idx);
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state->idx = idx;
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state->quad_count = quad_count;
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return 0;
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write_error:
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return gpg_error_from_syserror ();
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}
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gpg_error_t
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b64enc_finish (struct b64state *state)
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{
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gpg_error_t err = 0;
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unsigned char radbuf[4];
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int idx, quad_count;
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FILE *fp;
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char tmp[4];
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if (!(state->flags & B64ENC_DID_HEADER))
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goto cleanup;
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/* Flush the base64 encoding */
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fp = state->fp;
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idx = state->idx;
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quad_count = state->quad_count;
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assert (idx < 4);
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memcpy (radbuf, state->radbuf, idx);
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if (idx)
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{
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tmp[0] = bintoasc[(*radbuf>>2)&077];
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if (idx == 1)
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{
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tmp[1] = bintoasc[((*radbuf << 4) & 060) & 077];
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tmp[2] = '=';
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tmp[3] = '=';
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}
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else
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{
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tmp[1] = bintoasc[(((*radbuf<<4)&060)|((radbuf[1]>>4)&017))&077];
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tmp[2] = bintoasc[((radbuf[1] << 2) & 074) & 077];
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tmp[3] = '=';
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}
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for (idx=0; idx < 4; idx++)
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putc (tmp[idx], fp);
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idx = 0;
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if (ferror (fp))
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goto write_error;
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if (++quad_count >= (64/4))
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{
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quad_count = 0;
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if (!(state->flags & B64ENC_NO_LINEFEEDS)
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&& fputs ("\n", fp) == EOF)
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goto write_error;
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}
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}
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/* Finish the last line and write the trailer. */
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if (quad_count
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&& !(state->flags & B64ENC_NO_LINEFEEDS)
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&& fputs ("\n", fp) == EOF)
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goto write_error;
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if ( (state->flags & B64ENC_USE_PGPCRC) )
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{
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/* Write the CRC. */
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putc ('=', fp);
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radbuf[0] = state->crc >>16;
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radbuf[1] = state->crc >> 8;
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radbuf[2] = state->crc;
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tmp[0] = bintoasc[(*radbuf>>2)&077];
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tmp[1] = bintoasc[(((*radbuf<<4)&060)|((radbuf[1]>>4)&017))&077];
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tmp[2] = bintoasc[(((radbuf[1]<<2)&074)|((radbuf[2]>>6)&03))&077];
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tmp[3] = bintoasc[radbuf[2]&077];
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for (idx=0; idx < 4; idx++)
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putc (tmp[idx], fp);
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if (ferror (fp))
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goto write_error;
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if (!(state->flags & B64ENC_NO_LINEFEEDS)
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&& fputs ("\n", fp) == EOF)
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goto write_error;
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}
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if (state->title)
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{
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if ( fputs ("-----END ", fp) == EOF
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|| fputs (state->title, fp) == EOF
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|| fputs ("-----\n", fp) == EOF)
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goto write_error;
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}
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goto cleanup;
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write_error:
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err = gpg_error_from_syserror ();
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cleanup:
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if (state->title)
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{
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xfree (state->title);
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state->title = NULL;
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}
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state->fp = NULL;
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return err;
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}
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