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58964a49 | 1 | /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com) |
d02b48c6 RE |
2 | * All rights reserved. |
3 | * | |
4 | * This package is an SSL implementation written | |
5 | * by Eric Young (eay@cryptsoft.com). | |
6 | * The implementation was written so as to conform with Netscapes SSL. | |
0f113f3e | 7 | * |
d02b48c6 RE |
8 | * This library is free for commercial and non-commercial use as long as |
9 | * the following conditions are aheared to. The following conditions | |
10 | * apply to all code found in this distribution, be it the RC4, RSA, | |
11 | * lhash, DES, etc., code; not just the SSL code. The SSL documentation | |
12 | * included with this distribution is covered by the same copyright terms | |
13 | * except that the holder is Tim Hudson (tjh@cryptsoft.com). | |
0f113f3e | 14 | * |
d02b48c6 RE |
15 | * Copyright remains Eric Young's, and as such any Copyright notices in |
16 | * the code are not to be removed. | |
17 | * If this package is used in a product, Eric Young should be given attribution | |
18 | * as the author of the parts of the library used. | |
19 | * This can be in the form of a textual message at program startup or | |
20 | * in documentation (online or textual) provided with the package. | |
0f113f3e | 21 | * |
d02b48c6 RE |
22 | * Redistribution and use in source and binary forms, with or without |
23 | * modification, are permitted provided that the following conditions | |
24 | * are met: | |
25 | * 1. Redistributions of source code must retain the copyright | |
26 | * notice, this list of conditions and the following disclaimer. | |
27 | * 2. Redistributions in binary form must reproduce the above copyright | |
28 | * notice, this list of conditions and the following disclaimer in the | |
29 | * documentation and/or other materials provided with the distribution. | |
30 | * 3. All advertising materials mentioning features or use of this software | |
31 | * must display the following acknowledgement: | |
32 | * "This product includes cryptographic software written by | |
33 | * Eric Young (eay@cryptsoft.com)" | |
34 | * The word 'cryptographic' can be left out if the rouines from the library | |
35 | * being used are not cryptographic related :-). | |
0f113f3e | 36 | * 4. If you include any Windows specific code (or a derivative thereof) from |
d02b48c6 RE |
37 | * the apps directory (application code) you must include an acknowledgement: |
38 | * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)" | |
0f113f3e | 39 | * |
d02b48c6 RE |
40 | * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND |
41 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
42 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | |
43 | * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE | |
44 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL | |
45 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS | |
46 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |
47 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT | |
48 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY | |
49 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF | |
50 | * SUCH DAMAGE. | |
0f113f3e | 51 | * |
d02b48c6 RE |
52 | * The licence and distribution terms for any publically available version or |
53 | * derivative of this code cannot be changed. i.e. this code cannot simply be | |
54 | * copied and put under another distribution licence | |
55 | * [including the GNU Public Licence.] | |
56 | */ | |
57 | ||
58 | #include <stdio.h> | |
59 | #include <errno.h> | |
b39fc560 | 60 | #include "internal/cryptlib.h" |
ec577822 BM |
61 | #include <openssl/buffer.h> |
62 | #include <openssl/evp.h> | |
d02b48c6 | 63 | |
0e1c0612 UM |
64 | static int enc_write(BIO *h, const char *buf, int num); |
65 | static int enc_read(BIO *h, char *buf, int size); | |
0f113f3e MC |
66 | /* |
67 | * static int enc_puts(BIO *h, const char *str); | |
68 | */ | |
69 | /* | |
70 | * static int enc_gets(BIO *h, char *str, int size); | |
71 | */ | |
0e1c0612 | 72 | static long enc_ctrl(BIO *h, int cmd, long arg1, void *arg2); |
d02b48c6 RE |
73 | static int enc_new(BIO *h); |
74 | static int enc_free(BIO *data); | |
13083215 | 75 | static long enc_callback_ctrl(BIO *h, int cmd, bio_info_cb *fps); |
0f113f3e MC |
76 | #define ENC_BLOCK_SIZE (1024*4) |
77 | #define BUF_OFFSET (EVP_MAX_BLOCK_LENGTH*2) | |
78 | ||
79 | typedef struct enc_struct { | |
80 | int buf_len; | |
81 | int buf_off; | |
82 | int cont; /* <= 0 when finished */ | |
83 | int finished; | |
84 | int ok; /* bad decrypt */ | |
846ec07d | 85 | EVP_CIPHER_CTX *cipher; |
0f113f3e MC |
86 | /* |
87 | * buf is larger than ENC_BLOCK_SIZE because EVP_DecryptUpdate can return | |
88 | * up to a block more data than is presented to it | |
89 | */ | |
90 | char buf[ENC_BLOCK_SIZE + BUF_OFFSET + 2]; | |
91 | } BIO_ENC_CTX; | |
92 | ||
93 | static BIO_METHOD methods_enc = { | |
94 | BIO_TYPE_CIPHER, "cipher", | |
95 | enc_write, | |
96 | enc_read, | |
97 | NULL, /* enc_puts, */ | |
98 | NULL, /* enc_gets, */ | |
99 | enc_ctrl, | |
100 | enc_new, | |
101 | enc_free, | |
102 | enc_callback_ctrl, | |
103 | }; | |
d02b48c6 | 104 | |
6b691a5c | 105 | BIO_METHOD *BIO_f_cipher(void) |
0f113f3e MC |
106 | { |
107 | return (&methods_enc); | |
108 | } | |
d02b48c6 | 109 | |
6b691a5c | 110 | static int enc_new(BIO *bi) |
0f113f3e MC |
111 | { |
112 | BIO_ENC_CTX *ctx; | |
113 | ||
64b25758 | 114 | ctx = OPENSSL_zalloc(sizeof(*ctx)); |
0f113f3e | 115 | if (ctx == NULL) |
846ec07d | 116 | return 0; |
0f113f3e | 117 | |
846ec07d RL |
118 | ctx->cipher = EVP_CIPHER_CTX_new(); |
119 | if (ctx->cipher == NULL) { | |
120 | OPENSSL_free(ctx); | |
121 | return 0; | |
122 | } | |
0f113f3e | 123 | ctx->cont = 1; |
0f113f3e | 124 | ctx->ok = 1; |
0f113f3e MC |
125 | bi->init = 0; |
126 | bi->ptr = (char *)ctx; | |
127 | bi->flags = 0; | |
846ec07d | 128 | return 1; |
0f113f3e | 129 | } |
d02b48c6 | 130 | |
6b691a5c | 131 | static int enc_free(BIO *a) |
0f113f3e MC |
132 | { |
133 | BIO_ENC_CTX *b; | |
134 | ||
135 | if (a == NULL) | |
136 | return (0); | |
137 | b = (BIO_ENC_CTX *)a->ptr; | |
846ec07d | 138 | EVP_CIPHER_CTX_free(b->cipher); |
4b45c6e5 | 139 | OPENSSL_clear_free(a->ptr, sizeof(BIO_ENC_CTX)); |
0f113f3e MC |
140 | a->ptr = NULL; |
141 | a->init = 0; | |
142 | a->flags = 0; | |
143 | return (1); | |
144 | } | |
145 | ||
6b691a5c | 146 | static int enc_read(BIO *b, char *out, int outl) |
0f113f3e MC |
147 | { |
148 | int ret = 0, i; | |
149 | BIO_ENC_CTX *ctx; | |
150 | ||
151 | if (out == NULL) | |
152 | return (0); | |
153 | ctx = (BIO_ENC_CTX *)b->ptr; | |
154 | ||
155 | if ((ctx == NULL) || (b->next_bio == NULL)) | |
156 | return (0); | |
157 | ||
158 | /* First check if there are bytes decoded/encoded */ | |
159 | if (ctx->buf_len > 0) { | |
160 | i = ctx->buf_len - ctx->buf_off; | |
161 | if (i > outl) | |
162 | i = outl; | |
163 | memcpy(out, &(ctx->buf[ctx->buf_off]), i); | |
164 | ret = i; | |
165 | out += i; | |
166 | outl -= i; | |
167 | ctx->buf_off += i; | |
168 | if (ctx->buf_len == ctx->buf_off) { | |
169 | ctx->buf_len = 0; | |
170 | ctx->buf_off = 0; | |
171 | } | |
172 | } | |
173 | ||
174 | /* | |
175 | * At this point, we have room of outl bytes and an empty buffer, so we | |
176 | * should read in some more. | |
177 | */ | |
178 | ||
179 | while (outl > 0) { | |
180 | if (ctx->cont <= 0) | |
181 | break; | |
182 | ||
183 | /* | |
184 | * read in at IV offset, read the EVP_Cipher documentation about why | |
185 | */ | |
186 | i = BIO_read(b->next_bio, &(ctx->buf[BUF_OFFSET]), ENC_BLOCK_SIZE); | |
187 | ||
188 | if (i <= 0) { | |
189 | /* Should be continue next time we are called? */ | |
190 | if (!BIO_should_retry(b->next_bio)) { | |
191 | ctx->cont = i; | |
846ec07d | 192 | i = EVP_CipherFinal_ex(ctx->cipher, |
0f113f3e MC |
193 | (unsigned char *)ctx->buf, |
194 | &(ctx->buf_len)); | |
195 | ctx->ok = i; | |
196 | ctx->buf_off = 0; | |
197 | } else { | |
198 | ret = (ret == 0) ? i : ret; | |
199 | break; | |
200 | } | |
201 | } else { | |
846ec07d | 202 | if (!EVP_CipherUpdate(ctx->cipher, |
0f113f3e MC |
203 | (unsigned char *)ctx->buf, &ctx->buf_len, |
204 | (unsigned char *)&(ctx->buf[BUF_OFFSET]), | |
205 | i)) { | |
206 | BIO_clear_retry_flags(b); | |
207 | return 0; | |
208 | } | |
209 | ctx->cont = 1; | |
210 | /* | |
211 | * Note: it is possible for EVP_CipherUpdate to decrypt zero | |
212 | * bytes because this is or looks like the final block: if this | |
213 | * happens we should retry and either read more data or decrypt | |
214 | * the final block | |
215 | */ | |
216 | if (ctx->buf_len == 0) | |
217 | continue; | |
218 | } | |
219 | ||
220 | if (ctx->buf_len <= outl) | |
221 | i = ctx->buf_len; | |
222 | else | |
223 | i = outl; | |
224 | if (i <= 0) | |
225 | break; | |
226 | memcpy(out, ctx->buf, i); | |
227 | ret += i; | |
228 | ctx->buf_off = i; | |
229 | outl -= i; | |
230 | out += i; | |
231 | } | |
232 | ||
233 | BIO_clear_retry_flags(b); | |
234 | BIO_copy_next_retry(b); | |
235 | return ((ret == 0) ? ctx->cont : ret); | |
236 | } | |
d02b48c6 | 237 | |
0e1c0612 | 238 | static int enc_write(BIO *b, const char *in, int inl) |
0f113f3e MC |
239 | { |
240 | int ret = 0, n, i; | |
241 | BIO_ENC_CTX *ctx; | |
242 | ||
243 | ctx = (BIO_ENC_CTX *)b->ptr; | |
244 | ret = inl; | |
245 | ||
246 | BIO_clear_retry_flags(b); | |
247 | n = ctx->buf_len - ctx->buf_off; | |
248 | while (n > 0) { | |
249 | i = BIO_write(b->next_bio, &(ctx->buf[ctx->buf_off]), n); | |
250 | if (i <= 0) { | |
251 | BIO_copy_next_retry(b); | |
252 | return (i); | |
253 | } | |
254 | ctx->buf_off += i; | |
255 | n -= i; | |
256 | } | |
257 | /* at this point all pending data has been written */ | |
258 | ||
259 | if ((in == NULL) || (inl <= 0)) | |
260 | return (0); | |
261 | ||
262 | ctx->buf_off = 0; | |
263 | while (inl > 0) { | |
264 | n = (inl > ENC_BLOCK_SIZE) ? ENC_BLOCK_SIZE : inl; | |
846ec07d | 265 | if (!EVP_CipherUpdate(ctx->cipher, |
0f113f3e MC |
266 | (unsigned char *)ctx->buf, &ctx->buf_len, |
267 | (unsigned char *)in, n)) { | |
268 | BIO_clear_retry_flags(b); | |
269 | return 0; | |
270 | } | |
271 | inl -= n; | |
272 | in += n; | |
273 | ||
274 | ctx->buf_off = 0; | |
275 | n = ctx->buf_len; | |
276 | while (n > 0) { | |
277 | i = BIO_write(b->next_bio, &(ctx->buf[ctx->buf_off]), n); | |
278 | if (i <= 0) { | |
279 | BIO_copy_next_retry(b); | |
280 | return (ret == inl) ? i : ret - inl; | |
281 | } | |
282 | n -= i; | |
283 | ctx->buf_off += i; | |
284 | } | |
285 | ctx->buf_len = 0; | |
286 | ctx->buf_off = 0; | |
287 | } | |
288 | BIO_copy_next_retry(b); | |
289 | return (ret); | |
290 | } | |
d02b48c6 | 291 | |
0e1c0612 | 292 | static long enc_ctrl(BIO *b, int cmd, long num, void *ptr) |
0f113f3e MC |
293 | { |
294 | BIO *dbio; | |
295 | BIO_ENC_CTX *ctx, *dctx; | |
296 | long ret = 1; | |
297 | int i; | |
298 | EVP_CIPHER_CTX **c_ctx; | |
299 | ||
300 | ctx = (BIO_ENC_CTX *)b->ptr; | |
301 | ||
302 | switch (cmd) { | |
303 | case BIO_CTRL_RESET: | |
304 | ctx->ok = 1; | |
305 | ctx->finished = 0; | |
846ec07d RL |
306 | if (!EVP_CipherInit_ex(ctx->cipher, NULL, NULL, NULL, NULL, |
307 | EVP_CIPHER_CTX_encrypting(ctx->cipher))) | |
0f113f3e MC |
308 | return 0; |
309 | ret = BIO_ctrl(b->next_bio, cmd, num, ptr); | |
310 | break; | |
311 | case BIO_CTRL_EOF: /* More to read */ | |
312 | if (ctx->cont <= 0) | |
313 | ret = 1; | |
314 | else | |
315 | ret = BIO_ctrl(b->next_bio, cmd, num, ptr); | |
316 | break; | |
317 | case BIO_CTRL_WPENDING: | |
318 | ret = ctx->buf_len - ctx->buf_off; | |
319 | if (ret <= 0) | |
320 | ret = BIO_ctrl(b->next_bio, cmd, num, ptr); | |
321 | break; | |
322 | case BIO_CTRL_PENDING: /* More to read in buffer */ | |
323 | ret = ctx->buf_len - ctx->buf_off; | |
324 | if (ret <= 0) | |
325 | ret = BIO_ctrl(b->next_bio, cmd, num, ptr); | |
326 | break; | |
327 | case BIO_CTRL_FLUSH: | |
328 | /* do a final write */ | |
329 | again: | |
330 | while (ctx->buf_len != ctx->buf_off) { | |
331 | i = enc_write(b, NULL, 0); | |
332 | if (i < 0) | |
333 | return i; | |
334 | } | |
335 | ||
336 | if (!ctx->finished) { | |
337 | ctx->finished = 1; | |
338 | ctx->buf_off = 0; | |
846ec07d | 339 | ret = EVP_CipherFinal_ex(ctx->cipher, |
0f113f3e MC |
340 | (unsigned char *)ctx->buf, |
341 | &(ctx->buf_len)); | |
342 | ctx->ok = (int)ret; | |
343 | if (ret <= 0) | |
344 | break; | |
345 | ||
346 | /* push out the bytes */ | |
347 | goto again; | |
348 | } | |
349 | ||
350 | /* Finally flush the underlying BIO */ | |
351 | ret = BIO_ctrl(b->next_bio, cmd, num, ptr); | |
352 | break; | |
353 | case BIO_C_GET_CIPHER_STATUS: | |
354 | ret = (long)ctx->ok; | |
355 | break; | |
356 | case BIO_C_DO_STATE_MACHINE: | |
357 | BIO_clear_retry_flags(b); | |
358 | ret = BIO_ctrl(b->next_bio, cmd, num, ptr); | |
359 | BIO_copy_next_retry(b); | |
360 | break; | |
361 | case BIO_C_GET_CIPHER_CTX: | |
362 | c_ctx = (EVP_CIPHER_CTX **)ptr; | |
846ec07d | 363 | *c_ctx = ctx->cipher; |
0f113f3e MC |
364 | b->init = 1; |
365 | break; | |
366 | case BIO_CTRL_DUP: | |
367 | dbio = (BIO *)ptr; | |
368 | dctx = (BIO_ENC_CTX *)dbio->ptr; | |
846ec07d RL |
369 | dctx->cipher = EVP_CIPHER_CTX_new(); |
370 | if (dctx->cipher == NULL) | |
371 | return 0; | |
372 | ret = EVP_CIPHER_CTX_copy(dctx->cipher, ctx->cipher); | |
0f113f3e MC |
373 | if (ret) |
374 | dbio->init = 1; | |
375 | break; | |
376 | default: | |
377 | ret = BIO_ctrl(b->next_bio, cmd, num, ptr); | |
378 | break; | |
379 | } | |
380 | return (ret); | |
381 | } | |
d02b48c6 | 382 | |
13083215 | 383 | static long enc_callback_ctrl(BIO *b, int cmd, bio_info_cb *fp) |
0f113f3e MC |
384 | { |
385 | long ret = 1; | |
386 | ||
387 | if (b->next_bio == NULL) | |
388 | return (0); | |
389 | switch (cmd) { | |
390 | default: | |
391 | ret = BIO_callback_ctrl(b->next_bio, cmd, fp); | |
392 | break; | |
393 | } | |
394 | return (ret); | |
395 | } | |
d3442bc7 | 396 | |
1d97c843 | 397 | /*- |
58964a49 RE |
398 | void BIO_set_cipher_ctx(b,c) |
399 | BIO *b; | |
400 | EVP_CIPHER_ctx *c; | |
0f113f3e MC |
401 | { |
402 | if (b == NULL) return; | |
403 | ||
404 | if ((b->callback != NULL) && | |
405 | (b->callback(b,BIO_CB_CTRL,(char *)c,BIO_CTRL_SET,e,0L) <= 0)) | |
406 | return; | |
407 | ||
408 | b->init=1; | |
409 | ctx=(BIO_ENC_CTX *)b->ptr; | |
410 | memcpy(ctx->cipher,c,sizeof(EVP_CIPHER_CTX)); | |
411 | ||
412 | if (b->callback != NULL) | |
413 | b->callback(b,BIO_CB_CTRL,(char *)c,BIO_CTRL_SET,e,1L); | |
414 | } | |
58964a49 RE |
415 | */ |
416 | ||
b6dcdbfc | 417 | int BIO_set_cipher(BIO *b, const EVP_CIPHER *c, const unsigned char *k, |
0f113f3e MC |
418 | const unsigned char *i, int e) |
419 | { | |
420 | BIO_ENC_CTX *ctx; | |
421 | ||
422 | if (b == NULL) | |
423 | return 0; | |
424 | ||
425 | if ((b->callback != NULL) && | |
426 | (b->callback(b, BIO_CB_CTRL, (const char *)c, BIO_CTRL_SET, e, 0L) <= | |
427 | 0)) | |
428 | return 0; | |
429 | ||
430 | b->init = 1; | |
431 | ctx = (BIO_ENC_CTX *)b->ptr; | |
846ec07d | 432 | if (!EVP_CipherInit_ex(ctx->cipher, c, NULL, k, i, e)) |
0f113f3e MC |
433 | return 0; |
434 | ||
435 | if (b->callback != NULL) | |
436 | return b->callback(b, BIO_CB_CTRL, (const char *)c, BIO_CTRL_SET, e, | |
437 | 1L); | |
438 | return 1; | |
439 | } |