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-rw-r--r--src/lib/libcrypto/evp/evp_encode.c424
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diff --git a/src/lib/libcrypto/evp/evp_encode.c b/src/lib/libcrypto/evp/evp_encode.c
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1/* $OpenBSD: evp_encode.c,v 1.3 2024/04/09 13:52:41 beck Exp $ */
2/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
3 * All rights reserved.
4 *
5 * This package is an SSL implementation written
6 * by Eric Young (eay@cryptsoft.com).
7 * The implementation was written so as to conform with Netscapes SSL.
8 *
9 * This library is free for commercial and non-commercial use as long as
10 * the following conditions are aheared to. The following conditions
11 * apply to all code found in this distribution, be it the RC4, RSA,
12 * lhash, DES, etc., code; not just the SSL code. The SSL documentation
13 * included with this distribution is covered by the same copyright terms
14 * except that the holder is Tim Hudson (tjh@cryptsoft.com).
15 *
16 * Copyright remains Eric Young's, and as such any Copyright notices in
17 * the code are not to be removed.
18 * If this package is used in a product, Eric Young should be given attribution
19 * as the author of the parts of the library used.
20 * This can be in the form of a textual message at program startup or
21 * in documentation (online or textual) provided with the package.
22 *
23 * Redistribution and use in source and binary forms, with or without
24 * modification, are permitted provided that the following conditions
25 * are met:
26 * 1. Redistributions of source code must retain the copyright
27 * notice, this list of conditions and the following disclaimer.
28 * 2. Redistributions in binary form must reproduce the above copyright
29 * notice, this list of conditions and the following disclaimer in the
30 * documentation and/or other materials provided with the distribution.
31 * 3. All advertising materials mentioning features or use of this software
32 * must display the following acknowledgement:
33 * "This product includes cryptographic software written by
34 * Eric Young (eay@cryptsoft.com)"
35 * The word 'cryptographic' can be left out if the rouines from the library
36 * being used are not cryptographic related :-).
37 * 4. If you include any Windows specific code (or a derivative thereof) from
38 * the apps directory (application code) you must include an acknowledgement:
39 * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
40 *
41 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
42 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
43 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
44 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
45 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
46 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
47 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
48 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
49 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
50 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
51 * SUCH DAMAGE.
52 *
53 * The licence and distribution terms for any publically available version or
54 * derivative of this code cannot be changed. i.e. this code cannot simply be
55 * copied and put under another distribution licence
56 * [including the GNU Public Licence.]
57 */
58
59#include <limits.h>
60#include <stdio.h>
61#include <string.h>
62
63#include <openssl/evp.h>
64
65#include "evp_local.h"
66
67static unsigned char conv_ascii2bin(unsigned char a);
68#define conv_bin2ascii(a) (data_bin2ascii[(a)&0x3f])
69
70/* 64 char lines
71 * pad input with 0
72 * left over chars are set to =
73 * 1 byte => xx==
74 * 2 bytes => xxx=
75 * 3 bytes => xxxx
76 */
77#define BIN_PER_LINE (64/4*3)
78#define CHUNKS_PER_LINE (64/4)
79#define CHAR_PER_LINE (64+1)
80
81static const unsigned char data_bin2ascii[65] = "ABCDEFGHIJKLMNOPQRSTUVWXYZ\
82abcdefghijklmnopqrstuvwxyz0123456789+/";
83
84/* 0xF0 is a EOLN
85 * 0xF1 is ignore but next needs to be 0xF0 (for \r\n processing).
86 * 0xF2 is EOF
87 * 0xE0 is ignore at start of line.
88 * 0xFF is error
89 */
90
91#define B64_EOLN 0xF0
92#define B64_CR 0xF1
93#define B64_EOF 0xF2
94#define B64_WS 0xE0
95#define B64_ERROR 0xFF
96#define B64_NOT_BASE64(a) (((a)|0x13) == 0xF3)
97#define B64_BASE64(a) !B64_NOT_BASE64(a)
98
99static const unsigned char data_ascii2bin[128] = {
100 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
101 0xFF, 0xE0, 0xF0, 0xFF, 0xFF, 0xF1, 0xFF, 0xFF,
102 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
103 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
104 0xE0, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
105 0xFF, 0xFF, 0xFF, 0x3E, 0xFF, 0xF2, 0xFF, 0x3F,
106 0x34, 0x35, 0x36, 0x37, 0x38, 0x39, 0x3A, 0x3B,
107 0x3C, 0x3D, 0xFF, 0xFF, 0xFF, 0x00, 0xFF, 0xFF,
108 0xFF, 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06,
109 0x07, 0x08, 0x09, 0x0A, 0x0B, 0x0C, 0x0D, 0x0E,
110 0x0F, 0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16,
111 0x17, 0x18, 0x19, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
112 0xFF, 0x1A, 0x1B, 0x1C, 0x1D, 0x1E, 0x1F, 0x20,
113 0x21, 0x22, 0x23, 0x24, 0x25, 0x26, 0x27, 0x28,
114 0x29, 0x2A, 0x2B, 0x2C, 0x2D, 0x2E, 0x2F, 0x30,
115 0x31, 0x32, 0x33, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
116};
117
118static unsigned char
119conv_ascii2bin(unsigned char a)
120{
121 if (a & 0x80)
122 return B64_ERROR;
123 return data_ascii2bin[a];
124}
125
126EVP_ENCODE_CTX *
127EVP_ENCODE_CTX_new(void)
128{
129 return calloc(1, sizeof(EVP_ENCODE_CTX));
130}
131LCRYPTO_ALIAS(EVP_ENCODE_CTX_new);
132
133void
134EVP_ENCODE_CTX_free(EVP_ENCODE_CTX *ctx)
135{
136 free(ctx);
137}
138LCRYPTO_ALIAS(EVP_ENCODE_CTX_free);
139
140void
141EVP_EncodeInit(EVP_ENCODE_CTX *ctx)
142{
143 ctx->length = 48;
144 ctx->num = 0;
145 ctx->line_num = 0;
146}
147LCRYPTO_ALIAS(EVP_EncodeInit);
148
149int
150EVP_EncodeUpdate(EVP_ENCODE_CTX *ctx, unsigned char *out, int *outl,
151 const unsigned char *in, int inl)
152{
153 int i, j;
154 size_t total = 0;
155
156 *outl = 0;
157 if (inl <= 0)
158 return 0;
159 OPENSSL_assert(ctx->length <= (int)sizeof(ctx->enc_data));
160 if (ctx->length - ctx->num > inl) {
161 memcpy(&(ctx->enc_data[ctx->num]), in, inl);
162 ctx->num += inl;
163 return 1;
164 }
165 if (ctx->num != 0) {
166 i = ctx->length - ctx->num;
167 memcpy(&(ctx->enc_data[ctx->num]), in, i);
168 in += i;
169 inl -= i;
170 j = EVP_EncodeBlock(out, ctx->enc_data, ctx->length);
171 ctx->num = 0;
172 out += j;
173 *(out++) = '\n';
174 *out = '\0';
175 total = j + 1;
176 }
177 while (inl >= ctx->length && total <= INT_MAX) {
178 j = EVP_EncodeBlock(out, in, ctx->length);
179 in += ctx->length;
180 inl -= ctx->length;
181 out += j;
182 *(out++) = '\n';
183 *out = '\0';
184 total += j + 1;
185 }
186 if (total > INT_MAX) {
187 /* Too much output data! */
188 *outl = 0;
189 return 0;
190 }
191 if (inl != 0)
192 memcpy(&(ctx->enc_data[0]), in, inl);
193 ctx->num = inl;
194 *outl = total;
195
196 return 1;
197}
198LCRYPTO_ALIAS(EVP_EncodeUpdate);
199
200void
201EVP_EncodeFinal(EVP_ENCODE_CTX *ctx, unsigned char *out, int *outl)
202{
203 unsigned int ret = 0;
204
205 if (ctx->num != 0) {
206 ret = EVP_EncodeBlock(out, ctx->enc_data, ctx->num);
207 out[ret++] = '\n';
208 out[ret] = '\0';
209 ctx->num = 0;
210 }
211 *outl = ret;
212}
213LCRYPTO_ALIAS(EVP_EncodeFinal);
214
215int
216EVP_EncodeBlock(unsigned char *t, const unsigned char *f, int dlen)
217{
218 int i, ret = 0;
219 unsigned long l;
220
221 for (i = dlen; i > 0; i -= 3) {
222 if (i >= 3) {
223 l = (((unsigned long)f[0]) << 16L) |
224 (((unsigned long)f[1]) << 8L) | f[2];
225 *(t++) = conv_bin2ascii(l >> 18L);
226 *(t++) = conv_bin2ascii(l >> 12L);
227 *(t++) = conv_bin2ascii(l >> 6L);
228 *(t++) = conv_bin2ascii(l );
229 } else {
230 l = ((unsigned long)f[0]) << 16L;
231 if (i == 2)
232 l |= ((unsigned long)f[1] << 8L);
233
234 *(t++) = conv_bin2ascii(l >> 18L);
235 *(t++) = conv_bin2ascii(l >> 12L);
236 *(t++) = (i == 1) ? '=' : conv_bin2ascii(l >> 6L);
237 *(t++) = '=';
238 }
239 ret += 4;
240 f += 3;
241 }
242
243 *t = '\0';
244 return (ret);
245}
246LCRYPTO_ALIAS(EVP_EncodeBlock);
247
248void
249EVP_DecodeInit(EVP_ENCODE_CTX *ctx)
250{
251 ctx->num = 0;
252 ctx->length = 0;
253 ctx->line_num = 0;
254 ctx->expect_nl = 0;
255}
256LCRYPTO_ALIAS(EVP_DecodeInit);
257
258int
259EVP_DecodeUpdate(EVP_ENCODE_CTX *ctx, unsigned char *out, int *outl,
260 const unsigned char *in, int inl)
261{
262 int seof = 0, eof = 0, rv = -1, ret = 0, i, v, tmp, n, decoded_len;
263 unsigned char *d;
264
265 n = ctx->num;
266 d = ctx->enc_data;
267
268 if (n > 0 && d[n - 1] == '=') {
269 eof++;
270 if (n > 1 && d[n - 2] == '=')
271 eof++;
272 }
273
274 /* Legacy behaviour: an empty input chunk signals end of input. */
275 if (inl == 0) {
276 rv = 0;
277 goto end;
278 }
279
280 for (i = 0; i < inl; i++) {
281 tmp = *(in++);
282 v = conv_ascii2bin(tmp);
283 if (v == B64_ERROR) {
284 rv = -1;
285 goto end;
286 }
287
288 if (tmp == '=') {
289 eof++;
290 } else if (eof > 0 && B64_BASE64(v)) {
291 /* More data after padding. */
292 rv = -1;
293 goto end;
294 }
295
296 if (eof > 2) {
297 rv = -1;
298 goto end;
299 }
300
301 if (v == B64_EOF) {
302 seof = 1;
303 goto tail;
304 }
305
306 /* Only save valid base64 characters. */
307 if (B64_BASE64(v)) {
308 if (n >= 64) {
309 /*
310 * We increment n once per loop, and empty the
311 * buffer as soon as we reach 64 characters, so
312 * this can only happen if someone's manually
313 * messed with the ctx. Refuse to write any
314 * more data.
315 */
316 rv = -1;
317 goto end;
318 }
319 OPENSSL_assert(n < (int)sizeof(ctx->enc_data));
320 d[n++] = tmp;
321 }
322
323 if (n == 64) {
324 decoded_len = EVP_DecodeBlock(out, d, n);
325 n = 0;
326 if (decoded_len < 0 || eof > decoded_len) {
327 rv = -1;
328 goto end;
329 }
330 ret += decoded_len - eof;
331 out += decoded_len - eof;
332 }
333 }
334
335 /*
336 * Legacy behaviour: if the current line is a full base64-block (i.e.,
337 * has 0 mod 4 base64 characters), it is processed immediately. We keep
338 * this behaviour as applications may not be calling EVP_DecodeFinal
339 * properly.
340 */
341 tail:
342 if (n > 0) {
343 if ((n & 3) == 0) {
344 decoded_len = EVP_DecodeBlock(out, d, n);
345 n = 0;
346 if (decoded_len < 0 || eof > decoded_len) {
347 rv = -1;
348 goto end;
349 }
350 ret += (decoded_len - eof);
351 } else if (seof) {
352 /* EOF in the middle of a base64 block. */
353 rv = -1;
354 goto end;
355 }
356 }
357
358 rv = seof || (n == 0 && eof) ? 0 : 1;
359 end:
360 /* Legacy behaviour. This should probably rather be zeroed on error. */
361 *outl = ret;
362 ctx->num = n;
363 return (rv);
364}
365LCRYPTO_ALIAS(EVP_DecodeUpdate);
366
367int
368EVP_DecodeBlock(unsigned char *t, const unsigned char *f, int n)
369{
370 int i, ret = 0, a, b, c, d;
371 unsigned long l;
372
373 /* trim white space from the start of the line. */
374 while ((conv_ascii2bin(*f) == B64_WS) && (n > 0)) {
375 f++;
376 n--;
377 }
378
379 /* strip off stuff at the end of the line
380 * ascii2bin values B64_WS, B64_EOLN, B64_EOLN and B64_EOF */
381 while ((n > 3) && (B64_NOT_BASE64(conv_ascii2bin(f[n - 1]))))
382 n--;
383
384 if (n % 4 != 0)
385 return (-1);
386
387 for (i = 0; i < n; i += 4) {
388 a = conv_ascii2bin(*(f++));
389 b = conv_ascii2bin(*(f++));
390 c = conv_ascii2bin(*(f++));
391 d = conv_ascii2bin(*(f++));
392 if ((a & 0x80) || (b & 0x80) ||
393 (c & 0x80) || (d & 0x80))
394 return (-1);
395 l = ((((unsigned long)a) << 18L) |
396 (((unsigned long)b) << 12L) |
397 (((unsigned long)c) << 6L) |
398 (((unsigned long)d)));
399 *(t++) = (unsigned char)(l >> 16L) & 0xff;
400 *(t++) = (unsigned char)(l >> 8L) & 0xff;
401 *(t++) = (unsigned char)(l) & 0xff;
402 ret += 3;
403 }
404 return (ret);
405}
406LCRYPTO_ALIAS(EVP_DecodeBlock);
407
408int
409EVP_DecodeFinal(EVP_ENCODE_CTX *ctx, unsigned char *out, int *outl)
410{
411 int i;
412
413 *outl = 0;
414 if (ctx->num != 0) {
415 i = EVP_DecodeBlock(out, ctx->enc_data, ctx->num);
416 if (i < 0)
417 return (-1);
418 ctx->num = 0;
419 *outl = i;
420 return (1);
421 } else
422 return (1);
423}
424LCRYPTO_ALIAS(EVP_DecodeFinal);
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