aboutsummaryrefslogtreecommitdiffstats
path: root/crypto/evp/encode.c
blob: 5c5988fc45e1ca9a570273da39fbb679790b577d (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
/* crypto/evp/encode.c */
/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
 * All rights reserved.
 *
 * This package is an SSL implementation written
 * by Eric Young (eay@cryptsoft.com).
 * The implementation was written so as to conform with Netscapes SSL.
 *
 * This library is free for commercial and non-commercial use as long as
 * the following conditions are aheared to.  The following conditions
 * apply to all code found in this distribution, be it the RC4, RSA,
 * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
 * included with this distribution is covered by the same copyright terms
 * except that the holder is Tim Hudson (tjh@cryptsoft.com).
 *
 * Copyright remains Eric Young's, and as such any Copyright notices in
 * the code are not to be removed.
 * If this package is used in a product, Eric Young should be given attribution
 * as the author of the parts of the library used.
 * This can be in the form of a textual message at program startup or
 * in documentation (online or textual) provided with the package.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *    "This product includes cryptographic software written by
 *     Eric Young (eay@cryptsoft.com)"
 *    The word 'cryptographic' can be left out if the rouines from the library
 *    being used are not cryptographic related :-).
 * 4. If you include any Windows specific code (or a derivative thereof) from
 *    the apps directory (application code) you must include an acknowledgement:
 *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
 *
 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 * The licence and distribution terms for any publically available version or
 * derivative of this code cannot be changed.  i.e. this code cannot simply be
 * copied and put under another distribution licence
 * [including the GNU Public Licence.]
 */

#include <stdio.h>
#include "cryptlib.h"
#include <openssl/evp.h>

#ifndef CHARSET_EBCDIC
# define conv_bin2ascii(a)       (data_bin2ascii[(a)&0x3f])
# define conv_ascii2bin(a)       (data_ascii2bin[(a)&0x7f])
#else
/*
 * We assume that PEM encoded files are EBCDIC files (i.e., printable text
 * files). Convert them here while decoding. When encoding, output is EBCDIC
 * (text) format again. (No need for conversion in the conv_bin2ascii macro,
 * as the underlying textstring data_bin2ascii[] is already EBCDIC)
 */
# define conv_bin2ascii(a)       (data_bin2ascii[(a)&0x3f])
# define conv_ascii2bin(a)       (data_ascii2bin[os_toascii[a]&0x7f])
#endif

/*-
 * 64 char lines
 * pad input with 0
 * left over chars are set to =
 * 1 byte  => xx==
 * 2 bytes => xxx=
 * 3 bytes => xxxx
 */
#define BIN_PER_LINE    (64/4*3)
#define CHUNKS_PER_LINE (64/4)
#define CHAR_PER_LINE   (64+1)

static const unsigned char data_bin2ascii[65] = "ABCDEFGHIJKLMNOPQRSTUVWXYZ\
abcdefghijklmnopqrstuvwxyz0123456789+/";

/*-
 * 0xF0 is a EOLN
 * 0xF1 is ignore but next needs to be 0xF0 (for \r\n processing).
 * 0xF2 is EOF
 * 0xE0 is ignore at start of line.
 * 0xFF is error
 */

#define B64_EOLN                0xF0
#define B64_CR                  0xF1
#define B64_EOF                 0xF2
#define B64_WS                  0xE0
#define B64_ERROR               0xFF
#define B64_NOT_BASE64(a)       (((a)|0x13) == 0xF3)

static const unsigned char data_ascii2bin[128] = {
    0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
    0xFF, 0xE0, 0xF0, 0xFF, 0xFF, 0xF1, 0xFF, 0xFF,
    0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
    0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
    0xE0, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
    0xFF, 0xFF, 0xFF, 0x3E, 0xFF, 0xF2, 0xFF, 0x3F,
    0x34, 0x35, 0x36, 0x37, 0x38, 0x39, 0x3A, 0x3B,
    0x3C, 0x3D, 0xFF, 0xFF, 0xFF, 0x00, 0xFF, 0xFF,
    0xFF, 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06,
    0x07, 0x08, 0x09, 0x0A, 0x0B, 0x0C, 0x0D, 0x0E,
    0x0F, 0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16,
    0x17, 0x18, 0x19, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
    0xFF, 0x1A, 0x1B, 0x1C, 0x1D, 0x1E, 0x1F, 0x20,
    0x21, 0x22, 0x23, 0x24, 0x25, 0x26, 0x27, 0x28,
    0x29, 0x2A, 0x2B, 0x2C, 0x2D, 0x2E, 0x2F, 0x30,
    0x31, 0x32, 0x33, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
};

void EVP_EncodeInit(EVP_ENCODE_CTX *ctx)
{
    ctx->length = 48;
    ctx->num = 0;
    ctx->line_num = 0;
}

void EVP_EncodeUpdate(EVP_ENCODE_CTX *ctx, unsigned char *out, int *outl,
                      const unsigned char *in, int inl)
{
    int i, j;
    unsigned int total = 0;

    *outl = 0;
    if (inl <= 0)
        return;
    OPENSSL_assert(ctx->length <= (int)sizeof(ctx->enc_data));
    if ((ctx->num + inl) < ctx->length) {
        memcpy(&(ctx->enc_data[ctx->num]), in, inl);
        ctx->num += inl;
        return;
    }
    if (ctx->num != 0) {
        i = ctx->length - ctx->num;
        memcpy(&(ctx->enc_data[ctx->num]), in, i);
        in += i;
        inl -= i;
        j = EVP_EncodeBlock(out, ctx->enc_data, ctx->length);
        ctx->num = 0;
        out += j;
        *(out++) = '\n';
        *out = '\0';
        total = j + 1;
    }
    while (inl >= ctx->length) {
        j = EVP_EncodeBlock(out, in, ctx->length);
        in += ctx->length;
        inl -= ctx->length;
        out += j;
        *(out++) = '\n';
        *out = '\0';
        total += j + 1;
    }
    if (inl != 0)
        memcpy(&(ctx->enc_data[0]), in, inl);
    ctx->num = inl;
    *outl = total;
}

void EVP_EncodeFinal(EVP_ENCODE_CTX *ctx, unsigned char *out, int *outl)
{
    unsigned int ret = 0;

    if (ctx->num != 0) {
        ret = EVP_EncodeBlock(out, ctx->enc_data, ctx->num);
        out[ret++] = '\n';
        out[ret] = '\0';
        ctx->num = 0;
    }
    *outl = ret;
}

int EVP_EncodeBlock(unsigned char *t, const unsigned char *f, int dlen)
{
    int i, ret = 0;
    unsigned long l;

    for (i = dlen; i > 0; i -= 3) {
        if (i >= 3) {
            l = (((unsigned long)f[0]) << 16L) |
                (((unsigned long)f[1]) << 8L) | f[2];
            *(t++) = conv_bin2ascii(l >> 18L);
            *(t++) = conv_bin2ascii(l >> 12L);
            *(t++) = conv_bin2ascii(l >> 6L);
            *(t++) = conv_bin2ascii(l);
        } else {
            l = ((unsigned long)f[0]) << 16L;
            if (i == 2)
                l |= ((unsigned long)f[1] << 8L);

            *(t++) = conv_bin2ascii(l >> 18L);
            *(t++) = conv_bin2ascii(l >> 12L);
            *(t++) = (i == 1) ? '=' : conv_bin2ascii(l >> 6L);
            *(t++) = '=';
        }
        ret += 4;
        f += 3;
    }

    *t = '\0';
    return (ret);
}

void EVP_DecodeInit(EVP_ENCODE_CTX *ctx)
{
    ctx->length = 30;
    ctx->num = 0;
    ctx->line_num = 0;
    ctx->expect_nl = 0;
}

/*-
 * -1 for error
 *  0 for last line
 *  1 for full line
 */
int EVP_DecodeUpdate(EVP_ENCODE_CTX *ctx, unsigned char *out, int *outl,
                     const unsigned char *in, int inl)
{
    int seof = -1, eof = 0, rv = -1, ret = 0, i, v, tmp, n, ln, exp_nl;
    unsigned char *d;

    n = ctx->num;
    d = ctx->enc_data;
    ln = ctx->line_num;
    exp_nl = ctx->expect_nl;

    /* last line of input. */
    if ((inl == 0) || ((n == 0) && (conv_ascii2bin(in[0]) == B64_EOF))) {
        rv = 0;
        goto end;
    }

    /* We parse the input data */
    for (i = 0; i < inl; i++) {
        /* If the current line is > 80 characters, scream alot */
        if (ln >= 80) {
            rv = -1;
            goto end;
        }

        /* Get char and put it into the buffer */
        tmp = *(in++);
        v = conv_ascii2bin(tmp);
        /* only save the good data :-) */
        if (!B64_NOT_BASE64(v)) {
            OPENSSL_assert(n < (int)sizeof(ctx->enc_data));
            d[n++] = tmp;
            ln++;
        } else if (v == B64_ERROR) {
            rv = -1;
            goto end;
        }

        /*
         * have we seen a '=' which is 'definitly' the last input line.  seof
         * will point to the character that holds it. and eof will hold how
         * many characters to chop off.
         */
        if (tmp == '=') {
            if (seof == -1)
                seof = n;
            eof++;
        }

        if (v == B64_CR) {
            ln = 0;
            if (exp_nl)
                continue;
        }

        /* eoln */
        if (v == B64_EOLN) {
            ln = 0;
            if (exp_nl) {
                exp_nl = 0;
                continue;
            }
        }
        exp_nl = 0;

        /*
         * If we are at the end of input and it looks like a line, process
         * it.
         */
        if (((i + 1) == inl) && (((n & 3) == 0) || eof)) {
            v = B64_EOF;
            /*
             * In case things were given us in really small records (so two
             * '=' were given in separate updates), eof may contain the
             * incorrect number of ending bytes to skip, so let's redo the
             * count
             */
            eof = 0;
            if (d[n - 1] == '=')
                eof++;
            if (d[n - 2] == '=')
                eof++;
            /* There will never be more than two '=' */
        }

        if ((v == B64_EOF && (n & 3) == 0) || (n >= 64)) {
            /*
             * This is needed to work correctly on 64 byte input lines.  We
             * process the line and then need to accept the '\n'
             */
            if ((v != B64_EOF) && (n >= 64))
                exp_nl = 1;
            if (n > 0) {
                v = EVP_DecodeBlock(out, d, n);
                n = 0;
                if (v < 0) {
                    rv = 0;
                    goto end;
                }
                if (eof > v) {
                    rv = -1;
                    goto end;
                }
                ret += (v - eof);
            } else {
                eof = 1;
                v = 0;
            }

            /*
             * This is the case where we have had a short but valid input
             * line
             */
            if ((v < ctx->length) && eof) {
                rv = 0;
                goto end;
            } else
                ctx->length = v;

            if (seof >= 0) {
                rv = 0;
                goto end;
            }
            out += v;
        }
    }
    rv = 1;
 end:
    *outl = ret;
    ctx->num = n;
    ctx->line_num = ln;
    ctx->expect_nl = exp_nl;
    return (rv);
}

int EVP_DecodeBlock(unsigned char *t, const unsigned char *f, int n)
{
    int i, ret = 0, a, b, c, d;
    unsigned long l;

    /* trim white space from the start of the line. */
    while ((conv_ascii2bin(*f) == B64_WS) && (n > 0)) {
        f++;
        n--;
    }

    /*
     * strip off stuff at the end of the line ascii2bin values B64_WS,
     * B64_EOLN, B64_EOLN and B64_EOF
     */
    while ((n > 3) && (B64_NOT_BASE64(conv_ascii2bin(f[n - 1]))))
        n--;

    if (n % 4 != 0)
        return (-1);

    for (i = 0; i < n; i += 4) {
        a = conv_ascii2bin(*(f++));
        b = conv_ascii2bin(*(f++));
        c = conv_ascii2bin(*(f++));
        d = conv_ascii2bin(*(f++));
        if ((a & 0x80) || (b & 0x80) || (c & 0x80) || (d & 0x80))
            return (-1);
        l = ((((unsigned long)a) << 18L) |
             (((unsigned long)b) << 12L) |
             (((unsigned long)c) << 6L) | (((unsigned long)d)));
        *(t++) = (unsigned char)(l >> 16L) & 0xff;
        *(t++) = (unsigned char)(l >> 8L) & 0xff;
        *(t++) = (unsigned char)(l) & 0xff;
        ret += 3;
    }
    return (ret);
}

int EVP_DecodeFinal(EVP_ENCODE_CTX *ctx, unsigned char *out, int *outl)
{
    int i;

    *outl = 0;
    if (ctx->num != 0) {
        i = EVP_DecodeBlock(out, ctx->enc_data, ctx->num);
        if (i < 0)
            return (-1);
        ctx->num = 0;
        *outl = i;
        return (1);
    } else
        return (1);
}

#ifdef undef
int EVP_DecodeValid(unsigned char *buf, int len)
{
    int i, num = 0, bad = 0;

    if (len == 0)
        return (-1);
    while (conv_ascii2bin(*buf) == B64_WS) {
        buf++;
        len--;
        if (len == 0)
            return (-1);
    }

    for (i = len; i >= 4; i -= 4) {
        if ((conv_ascii2bin(buf[0]) >= 0x40) ||
            (conv_ascii2bin(buf[1]) >= 0x40) ||
            (conv_ascii2bin(buf[2]) >= 0x40) ||
            (conv_ascii2bin(buf[3]) >= 0x40))
            return (-1);
        buf += 4;
        num += 1 + (buf[2] != '=') + (buf[3] != '=');
    }
    if ((i == 1) && (conv_ascii2bin(buf[0]) == B64_EOLN))
        return (num);
    if ((i == 2) && (conv_ascii2bin(buf[0]) == B64_EOLN) &&
        (conv_ascii2bin(buf[0]) == B64_EOLN))
        return (num);
    return (1);
}
#endif