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-rw-r--r--src/lib/libcrypto/evp/bio_enc.c427
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diff --git a/src/lib/libcrypto/evp/bio_enc.c b/src/lib/libcrypto/evp/bio_enc.c
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1/* $OpenBSD: bio_enc.c,v 1.18 2014/07/11 08:44:48 jsing 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 <errno.h>
60#include <stdio.h>
61#include <string.h>
62
63#include <openssl/buffer.h>
64#include <openssl/evp.h>
65
66static int enc_write(BIO *h, const char *buf, int num);
67static int enc_read(BIO *h, char *buf, int size);
68/*static int enc_puts(BIO *h, const char *str); */
69/*static int enc_gets(BIO *h, char *str, int size); */
70static long enc_ctrl(BIO *h, int cmd, long arg1, void *arg2);
71static int enc_new(BIO *h);
72static int enc_free(BIO *data);
73static long enc_callback_ctrl(BIO *h, int cmd, bio_info_cb *fps);
74#define ENC_BLOCK_SIZE (1024*4)
75#define BUF_OFFSET (EVP_MAX_BLOCK_LENGTH*2)
76
77typedef struct enc_struct {
78 int buf_len;
79 int buf_off;
80 int cont; /* <= 0 when finished */
81 int finished;
82 int ok; /* bad decrypt */
83 EVP_CIPHER_CTX cipher;
84 /* buf is larger than ENC_BLOCK_SIZE because EVP_DecryptUpdate
85 * can return up to a block more data than is presented to it
86 */
87 char buf[ENC_BLOCK_SIZE + BUF_OFFSET + 2];
88} BIO_ENC_CTX;
89
90static BIO_METHOD methods_enc = {
91 .type = BIO_TYPE_CIPHER,
92 .name = "cipher",
93 .bwrite = enc_write,
94 .bread = enc_read,
95 .ctrl = enc_ctrl,
96 .create = enc_new,
97 .destroy = enc_free,
98 .callback_ctrl = enc_callback_ctrl
99};
100
101BIO_METHOD *
102BIO_f_cipher(void)
103{
104 return (&methods_enc);
105}
106
107static int
108enc_new(BIO *bi)
109{
110 BIO_ENC_CTX *ctx;
111
112 ctx = malloc(sizeof(BIO_ENC_CTX));
113 if (ctx == NULL)
114 return (0);
115 EVP_CIPHER_CTX_init(&ctx->cipher);
116
117 ctx->buf_len = 0;
118 ctx->buf_off = 0;
119 ctx->cont = 1;
120 ctx->finished = 0;
121 ctx->ok = 1;
122
123 bi->init = 0;
124 bi->ptr = (char *)ctx;
125 bi->flags = 0;
126 return (1);
127}
128
129static int
130enc_free(BIO *a)
131{
132 BIO_ENC_CTX *b;
133
134 if (a == NULL)
135 return (0);
136 b = (BIO_ENC_CTX *)a->ptr;
137 EVP_CIPHER_CTX_cleanup(&(b->cipher));
138 OPENSSL_cleanse(a->ptr, sizeof(BIO_ENC_CTX));
139 free(a->ptr);
140 a->ptr = NULL;
141 a->init = 0;
142 a->flags = 0;
143 return (1);
144}
145
146static int
147enc_read(BIO *b, char *out, int outl)
148{
149 int ret = 0, i;
150 BIO_ENC_CTX *ctx;
151
152 if (out == NULL)
153 return (0);
154 ctx = (BIO_ENC_CTX *)b->ptr;
155
156 if ((ctx == NULL) || (b->next_bio == NULL))
157 return (0);
158
159 /* First check if there are bytes decoded/encoded */
160 if (ctx->buf_len > 0) {
161 i = ctx->buf_len - ctx->buf_off;
162 if (i > outl)
163 i = outl;
164 memcpy(out, &(ctx->buf[ctx->buf_off]), i);
165 ret = i;
166 out += i;
167 outl -= i;
168 ctx->buf_off += i;
169 if (ctx->buf_len == ctx->buf_off) {
170 ctx->buf_len = 0;
171 ctx->buf_off = 0;
172 }
173 }
174
175 /* At this point, we have room of outl bytes and an empty
176 * buffer, so we should read in some more. */
177
178 while (outl > 0) {
179 if (ctx->cont <= 0)
180 break;
181
182 /* read in at IV offset, read the EVP_Cipher
183 * documentation about why */
184 i = BIO_read(b->next_bio, &(ctx->buf[BUF_OFFSET]), ENC_BLOCK_SIZE);
185
186 if (i <= 0) {
187 /* Should be continue next time we are called? */
188 if (!BIO_should_retry(b->next_bio)) {
189 ctx->cont = i;
190 i = EVP_CipherFinal_ex(&(ctx->cipher),
191 (unsigned char *)ctx->buf,
192 &(ctx->buf_len));
193 ctx->ok = i;
194 ctx->buf_off = 0;
195 } else {
196 ret = (ret == 0) ? i : ret;
197 break;
198 }
199 } else {
200 EVP_CipherUpdate(&(ctx->cipher),
201 (unsigned char *)ctx->buf, &ctx->buf_len,
202 (unsigned char *)&(ctx->buf[BUF_OFFSET]), i);
203 ctx->cont = 1;
204 /* Note: it is possible for EVP_CipherUpdate to
205 * decrypt zero bytes because this is or looks like
206 * the final block: if this happens we should retry
207 * and either read more data or decrypt the final
208 * block
209 */
210 if (ctx->buf_len == 0)
211 continue;
212 }
213
214 if (ctx->buf_len <= outl)
215 i = ctx->buf_len;
216 else
217 i = outl;
218 if (i <= 0)
219 break;
220 memcpy(out, ctx->buf, i);
221 ret += i;
222 ctx->buf_off = i;
223 outl -= i;
224 out += i;
225 }
226
227 BIO_clear_retry_flags(b);
228 BIO_copy_next_retry(b);
229 return ((ret == 0) ? ctx->cont : ret);
230}
231
232static int
233enc_write(BIO *b, const char *in, int inl)
234{
235 int ret = 0, n, i;
236 BIO_ENC_CTX *ctx;
237
238 ctx = (BIO_ENC_CTX *)b->ptr;
239 ret = inl;
240
241 BIO_clear_retry_flags(b);
242 n = ctx->buf_len - ctx->buf_off;
243 while (n > 0) {
244 i = BIO_write(b->next_bio, &(ctx->buf[ctx->buf_off]), n);
245 if (i <= 0) {
246 BIO_copy_next_retry(b);
247 return (i);
248 }
249 ctx->buf_off += i;
250 n -= i;
251 }
252 /* at this point all pending data has been written */
253
254 if ((in == NULL) || (inl <= 0))
255 return (0);
256
257 ctx->buf_off = 0;
258 while (inl > 0) {
259 n = (inl > ENC_BLOCK_SIZE) ? ENC_BLOCK_SIZE : inl;
260 EVP_CipherUpdate(&(ctx->cipher),
261 (unsigned char *)ctx->buf, &ctx->buf_len,
262 (unsigned char *)in, n);
263 inl -= n;
264 in += n;
265
266 ctx->buf_off = 0;
267 n = ctx->buf_len;
268 while (n > 0) {
269 i = BIO_write(b->next_bio, &(ctx->buf[ctx->buf_off]), n);
270 if (i <= 0) {
271 BIO_copy_next_retry(b);
272 return (ret == inl) ? i : ret - inl;
273 }
274 n -= i;
275 ctx->buf_off += i;
276 }
277 ctx->buf_len = 0;
278 ctx->buf_off = 0;
279 }
280 BIO_copy_next_retry(b);
281 return (ret);
282}
283
284static long
285enc_ctrl(BIO *b, int cmd, long num, void *ptr)
286{
287 BIO *dbio;
288 BIO_ENC_CTX *ctx, *dctx;
289 long ret = 1;
290 int i;
291 EVP_CIPHER_CTX **c_ctx;
292
293 ctx = (BIO_ENC_CTX *)b->ptr;
294
295 switch (cmd) {
296 case BIO_CTRL_RESET:
297 ctx->ok = 1;
298 ctx->finished = 0;
299 EVP_CipherInit_ex(&(ctx->cipher), NULL, NULL, NULL, NULL,
300 ctx->cipher.encrypt);
301 ret = BIO_ctrl(b->next_bio, cmd, num, ptr);
302 break;
303 case BIO_CTRL_EOF: /* More to read */
304 if (ctx->cont <= 0)
305 ret = 1;
306 else
307 ret = BIO_ctrl(b->next_bio, cmd, num, ptr);
308 break;
309 case BIO_CTRL_WPENDING:
310 ret = ctx->buf_len - ctx->buf_off;
311 if (ret <= 0)
312 ret = BIO_ctrl(b->next_bio, cmd, num, ptr);
313 break;
314 case BIO_CTRL_PENDING: /* More to read in buffer */
315 ret = ctx->buf_len - ctx->buf_off;
316 if (ret <= 0)
317 ret = BIO_ctrl(b->next_bio, cmd, num, ptr);
318 break;
319 case BIO_CTRL_FLUSH:
320 /* do a final write */
321again:
322 while (ctx->buf_len != ctx->buf_off) {
323 i = enc_write(b, NULL, 0);
324 if (i < 0)
325 return i;
326 }
327
328 if (!ctx->finished) {
329 ctx->finished = 1;
330 ctx->buf_off = 0;
331 ret = EVP_CipherFinal_ex(&(ctx->cipher),
332 (unsigned char *)ctx->buf,
333 &(ctx->buf_len));
334 ctx->ok = (int)ret;
335 if (ret <= 0)
336 break;
337
338 /* push out the bytes */
339 goto again;
340 }
341
342 /* Finally flush the underlying BIO */
343 ret = BIO_ctrl(b->next_bio, cmd, num, ptr);
344 break;
345 case BIO_C_GET_CIPHER_STATUS:
346 ret = (long)ctx->ok;
347 break;
348 case BIO_C_DO_STATE_MACHINE:
349 BIO_clear_retry_flags(b);
350 ret = BIO_ctrl(b->next_bio, cmd, num, ptr);
351 BIO_copy_next_retry(b);
352 break;
353 case BIO_C_GET_CIPHER_CTX:
354 c_ctx = (EVP_CIPHER_CTX **)ptr;
355 (*c_ctx) = &(ctx->cipher);
356 b->init = 1;
357 break;
358 case BIO_CTRL_DUP:
359 dbio = (BIO *)ptr;
360 dctx = (BIO_ENC_CTX *)dbio->ptr;
361 EVP_CIPHER_CTX_init(&dctx->cipher);
362 ret = EVP_CIPHER_CTX_copy(&dctx->cipher, &ctx->cipher);
363 if (ret)
364 dbio->init = 1;
365 break;
366 default:
367 ret = BIO_ctrl(b->next_bio, cmd, num, ptr);
368 break;
369 }
370 return (ret);
371}
372
373static long
374enc_callback_ctrl(BIO *b, int cmd, bio_info_cb *fp)
375{
376 long ret = 1;
377
378 if (b->next_bio == NULL)
379 return (0);
380 switch (cmd) {
381 default:
382 ret = BIO_callback_ctrl(b->next_bio, cmd, fp);
383 break;
384 }
385 return (ret);
386}
387
388/*
389void BIO_set_cipher_ctx(b,c)
390BIO *b;
391EVP_CIPHER_ctx *c;
392 {
393 if (b == NULL) return;
394
395 if ((b->callback != NULL) &&
396 (b->callback(b,BIO_CB_CTRL,(char *)c,BIO_CTRL_SET,e,0L) <= 0))
397 return;
398
399 b->init=1;
400 ctx=(BIO_ENC_CTX *)b->ptr;
401 memcpy(ctx->cipher,c,sizeof(EVP_CIPHER_CTX));
402
403 if (b->callback != NULL)
404 b->callback(b,BIO_CB_CTRL,(char *)c,BIO_CTRL_SET,e,1L);
405 }
406*/
407
408void
409BIO_set_cipher(BIO *b, const EVP_CIPHER *c, const unsigned char *k,
410 const unsigned char *i, int e)
411{
412 BIO_ENC_CTX *ctx;
413
414 if (b == NULL)
415 return;
416
417 if ((b->callback != NULL) &&
418 (b->callback(b, BIO_CB_CTRL, (const char *)c, BIO_CTRL_SET, e, 0L) <= 0))
419 return;
420
421 b->init = 1;
422 ctx = (BIO_ENC_CTX *)b->ptr;
423 EVP_CipherInit_ex(&(ctx->cipher), c, NULL, k, i, e);
424
425 if (b->callback != NULL)
426 b->callback(b, BIO_CB_CTRL, (const char *)c, BIO_CTRL_SET, e, 1L);
427}
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