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d02b48c6 | 1 | /* crypto/evp/bio_enc.c */ |
58964a49 | 2 | /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com) |
d02b48c6 RE |
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. | |
40720ce3 | 8 | * |
d02b48c6 RE |
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). | |
40720ce3 | 15 | * |
d02b48c6 RE |
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. | |
40720ce3 | 22 | * |
d02b48c6 RE |
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 :-). | |
40720ce3 | 37 | * 4. If you include any Windows specific code (or a derivative thereof) from |
d02b48c6 RE |
38 | * the apps directory (application code) you must include an acknowledgement: |
39 | * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)" | |
40720ce3 | 40 | * |
d02b48c6 RE |
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. | |
40720ce3 | 52 | * |
d02b48c6 RE |
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 <stdio.h> | |
60 | #include <errno.h> | |
61 | #include "cryptlib.h" | |
ec577822 BM |
62 | #include <openssl/buffer.h> |
63 | #include <openssl/evp.h> | |
d02b48c6 | 64 | |
0e1c0612 UM |
65 | static int enc_write(BIO *h, const char *buf, int num); |
66 | static int enc_read(BIO *h, char *buf, int size); | |
40720ce3 MC |
67 | /* |
68 | * static int enc_puts(BIO *h, const char *str); | |
69 | */ | |
70 | /* | |
71 | * static int enc_gets(BIO *h, char *str, int size); | |
72 | */ | |
0e1c0612 | 73 | static long enc_ctrl(BIO *h, int cmd, long arg1, void *arg2); |
d02b48c6 RE |
74 | static int enc_new(BIO *h); |
75 | static int enc_free(BIO *data); | |
13083215 | 76 | static long enc_callback_ctrl(BIO *h, int cmd, bio_info_cb *fps); |
40720ce3 MC |
77 | #define ENC_BLOCK_SIZE (1024*4) |
78 | #define BUF_OFFSET (EVP_MAX_BLOCK_LENGTH*2) | |
79 | ||
80 | typedef struct enc_struct { | |
81 | int buf_len; | |
82 | int buf_off; | |
83 | int cont; /* <= 0 when finished */ | |
84 | int finished; | |
85 | int ok; /* bad decrypt */ | |
86 | EVP_CIPHER_CTX cipher; | |
87 | /* | |
88 | * buf is larger than ENC_BLOCK_SIZE because EVP_DecryptUpdate can return | |
89 | * up to a block more data than is presented to it | |
90 | */ | |
91 | char buf[ENC_BLOCK_SIZE + BUF_OFFSET + 2]; | |
92 | } BIO_ENC_CTX; | |
93 | ||
94 | static BIO_METHOD methods_enc = { | |
95 | BIO_TYPE_CIPHER, "cipher", | |
96 | enc_write, | |
97 | enc_read, | |
98 | NULL, /* enc_puts, */ | |
99 | NULL, /* enc_gets, */ | |
100 | enc_ctrl, | |
101 | enc_new, | |
102 | enc_free, | |
103 | enc_callback_ctrl, | |
104 | }; | |
d02b48c6 | 105 | |
6b691a5c | 106 | BIO_METHOD *BIO_f_cipher(void) |
40720ce3 MC |
107 | { |
108 | return (&methods_enc); | |
109 | } | |
d02b48c6 | 110 | |
6b691a5c | 111 | static int enc_new(BIO *bi) |
40720ce3 MC |
112 | { |
113 | BIO_ENC_CTX *ctx; | |
114 | ||
115 | ctx = (BIO_ENC_CTX *)OPENSSL_malloc(sizeof(BIO_ENC_CTX)); | |
116 | if (ctx == NULL) | |
117 | return (0); | |
118 | EVP_CIPHER_CTX_init(&ctx->cipher); | |
119 | ||
120 | ctx->buf_len = 0; | |
121 | ctx->buf_off = 0; | |
122 | ctx->cont = 1; | |
123 | ctx->finished = 0; | |
124 | ctx->ok = 1; | |
125 | ||
126 | bi->init = 0; | |
127 | bi->ptr = (char *)ctx; | |
128 | bi->flags = 0; | |
129 | return (1); | |
130 | } | |
d02b48c6 | 131 | |
6b691a5c | 132 | static int enc_free(BIO *a) |
40720ce3 MC |
133 | { |
134 | BIO_ENC_CTX *b; | |
135 | ||
136 | if (a == NULL) | |
137 | return (0); | |
138 | b = (BIO_ENC_CTX *)a->ptr; | |
139 | EVP_CIPHER_CTX_cleanup(&(b->cipher)); | |
140 | OPENSSL_cleanse(a->ptr, sizeof(BIO_ENC_CTX)); | |
141 | OPENSSL_free(a->ptr); | |
142 | a->ptr = NULL; | |
143 | a->init = 0; | |
144 | a->flags = 0; | |
145 | return (1); | |
146 | } | |
147 | ||
6b691a5c | 148 | static int enc_read(BIO *b, char *out, int outl) |
40720ce3 MC |
149 | { |
150 | int ret = 0, i; | |
151 | BIO_ENC_CTX *ctx; | |
152 | ||
153 | if (out == NULL) | |
154 | return (0); | |
155 | ctx = (BIO_ENC_CTX *)b->ptr; | |
156 | ||
157 | if ((ctx == NULL) || (b->next_bio == NULL)) | |
158 | return (0); | |
159 | ||
160 | /* First check if there are bytes decoded/encoded */ | |
161 | if (ctx->buf_len > 0) { | |
162 | i = ctx->buf_len - ctx->buf_off; | |
163 | if (i > outl) | |
164 | i = outl; | |
165 | memcpy(out, &(ctx->buf[ctx->buf_off]), i); | |
166 | ret = i; | |
167 | out += i; | |
168 | outl -= i; | |
169 | ctx->buf_off += i; | |
170 | if (ctx->buf_len == ctx->buf_off) { | |
171 | ctx->buf_len = 0; | |
172 | ctx->buf_off = 0; | |
173 | } | |
174 | } | |
175 | ||
176 | /* | |
177 | * At this point, we have room of outl bytes and an empty buffer, so we | |
178 | * should read in some more. | |
179 | */ | |
180 | ||
181 | while (outl > 0) { | |
182 | if (ctx->cont <= 0) | |
183 | break; | |
184 | ||
185 | /* | |
186 | * read in at IV offset, read the EVP_Cipher documentation about why | |
187 | */ | |
188 | i = BIO_read(b->next_bio, &(ctx->buf[BUF_OFFSET]), ENC_BLOCK_SIZE); | |
189 | ||
190 | if (i <= 0) { | |
191 | /* Should be continue next time we are called? */ | |
192 | if (!BIO_should_retry(b->next_bio)) { | |
193 | ctx->cont = i; | |
194 | i = EVP_CipherFinal_ex(&(ctx->cipher), | |
195 | (unsigned char *)ctx->buf, | |
196 | &(ctx->buf_len)); | |
197 | ctx->ok = i; | |
198 | ctx->buf_off = 0; | |
199 | } else { | |
200 | ret = (ret == 0) ? i : ret; | |
201 | break; | |
202 | } | |
203 | } else { | |
204 | EVP_CipherUpdate(&(ctx->cipher), | |
205 | (unsigned char *)ctx->buf, &ctx->buf_len, | |
206 | (unsigned char *)&(ctx->buf[BUF_OFFSET]), i); | |
207 | ctx->cont = 1; | |
208 | /* | |
209 | * Note: it is possible for EVP_CipherUpdate to decrypt zero | |
210 | * bytes because this is or looks like the final block: if this | |
211 | * happens we should retry and either read more data or decrypt | |
212 | * the final block | |
213 | */ | |
214 | if (ctx->buf_len == 0) | |
215 | continue; | |
216 | } | |
217 | ||
218 | if (ctx->buf_len <= outl) | |
219 | i = ctx->buf_len; | |
220 | else | |
221 | i = outl; | |
222 | if (i <= 0) | |
223 | break; | |
224 | memcpy(out, ctx->buf, i); | |
225 | ret += i; | |
226 | ctx->buf_off = i; | |
227 | outl -= i; | |
228 | out += i; | |
229 | } | |
230 | ||
231 | BIO_clear_retry_flags(b); | |
232 | BIO_copy_next_retry(b); | |
233 | return ((ret == 0) ? ctx->cont : ret); | |
234 | } | |
d02b48c6 | 235 | |
0e1c0612 | 236 | static int enc_write(BIO *b, const char *in, int inl) |
40720ce3 MC |
237 | { |
238 | int ret = 0, n, i; | |
239 | BIO_ENC_CTX *ctx; | |
240 | ||
241 | ctx = (BIO_ENC_CTX *)b->ptr; | |
242 | ret = inl; | |
243 | ||
244 | BIO_clear_retry_flags(b); | |
245 | n = ctx->buf_len - ctx->buf_off; | |
246 | while (n > 0) { | |
247 | i = BIO_write(b->next_bio, &(ctx->buf[ctx->buf_off]), n); | |
248 | if (i <= 0) { | |
249 | BIO_copy_next_retry(b); | |
250 | return (i); | |
251 | } | |
252 | ctx->buf_off += i; | |
253 | n -= i; | |
254 | } | |
255 | /* at this point all pending data has been written */ | |
256 | ||
257 | if ((in == NULL) || (inl <= 0)) | |
258 | return (0); | |
259 | ||
260 | ctx->buf_off = 0; | |
261 | while (inl > 0) { | |
262 | n = (inl > ENC_BLOCK_SIZE) ? ENC_BLOCK_SIZE : inl; | |
263 | EVP_CipherUpdate(&(ctx->cipher), | |
264 | (unsigned char *)ctx->buf, &ctx->buf_len, | |
265 | (unsigned char *)in, n); | |
266 | inl -= n; | |
267 | in += n; | |
268 | ||
269 | ctx->buf_off = 0; | |
270 | n = ctx->buf_len; | |
271 | while (n > 0) { | |
272 | i = BIO_write(b->next_bio, &(ctx->buf[ctx->buf_off]), n); | |
273 | if (i <= 0) { | |
274 | BIO_copy_next_retry(b); | |
275 | return (ret == inl) ? i : ret - inl; | |
276 | } | |
277 | n -= i; | |
278 | ctx->buf_off += i; | |
279 | } | |
280 | ctx->buf_len = 0; | |
281 | ctx->buf_off = 0; | |
282 | } | |
283 | BIO_copy_next_retry(b); | |
284 | return (ret); | |
285 | } | |
d02b48c6 | 286 | |
0e1c0612 | 287 | static long enc_ctrl(BIO *b, int cmd, long num, void *ptr) |
40720ce3 MC |
288 | { |
289 | BIO *dbio; | |
290 | BIO_ENC_CTX *ctx, *dctx; | |
291 | long ret = 1; | |
292 | int i; | |
293 | EVP_CIPHER_CTX **c_ctx; | |
294 | ||
295 | ctx = (BIO_ENC_CTX *)b->ptr; | |
296 | ||
297 | switch (cmd) { | |
298 | case BIO_CTRL_RESET: | |
299 | ctx->ok = 1; | |
300 | ctx->finished = 0; | |
301 | EVP_CipherInit_ex(&(ctx->cipher), NULL, NULL, NULL, NULL, | |
302 | ctx->cipher.encrypt); | |
303 | ret = BIO_ctrl(b->next_bio, cmd, num, ptr); | |
304 | break; | |
305 | case BIO_CTRL_EOF: /* More to read */ | |
306 | if (ctx->cont <= 0) | |
307 | ret = 1; | |
308 | else | |
309 | ret = BIO_ctrl(b->next_bio, cmd, num, ptr); | |
310 | break; | |
311 | case BIO_CTRL_WPENDING: | |
312 | ret = ctx->buf_len - ctx->buf_off; | |
313 | if (ret <= 0) | |
314 | ret = BIO_ctrl(b->next_bio, cmd, num, ptr); | |
315 | break; | |
316 | case BIO_CTRL_PENDING: /* More to read in buffer */ | |
317 | ret = ctx->buf_len - ctx->buf_off; | |
318 | if (ret <= 0) | |
319 | ret = BIO_ctrl(b->next_bio, cmd, num, ptr); | |
320 | break; | |
321 | case BIO_CTRL_FLUSH: | |
322 | /* do a final write */ | |
323 | again: | |
324 | while (ctx->buf_len != ctx->buf_off) { | |
325 | i = enc_write(b, NULL, 0); | |
326 | if (i < 0) | |
327 | return i; | |
328 | } | |
329 | ||
330 | if (!ctx->finished) { | |
331 | ctx->finished = 1; | |
332 | ctx->buf_off = 0; | |
333 | ret = EVP_CipherFinal_ex(&(ctx->cipher), | |
334 | (unsigned char *)ctx->buf, | |
335 | &(ctx->buf_len)); | |
336 | ctx->ok = (int)ret; | |
337 | if (ret <= 0) | |
338 | break; | |
339 | ||
340 | /* push out the bytes */ | |
341 | goto again; | |
342 | } | |
343 | ||
344 | /* Finally flush the underlying BIO */ | |
345 | ret = BIO_ctrl(b->next_bio, cmd, num, ptr); | |
346 | break; | |
347 | case BIO_C_GET_CIPHER_STATUS: | |
348 | ret = (long)ctx->ok; | |
349 | break; | |
350 | case BIO_C_DO_STATE_MACHINE: | |
351 | BIO_clear_retry_flags(b); | |
352 | ret = BIO_ctrl(b->next_bio, cmd, num, ptr); | |
353 | BIO_copy_next_retry(b); | |
354 | break; | |
355 | case BIO_C_GET_CIPHER_CTX: | |
356 | c_ctx = (EVP_CIPHER_CTX **)ptr; | |
357 | (*c_ctx) = &(ctx->cipher); | |
358 | b->init = 1; | |
359 | break; | |
360 | case BIO_CTRL_DUP: | |
361 | dbio = (BIO *)ptr; | |
362 | dctx = (BIO_ENC_CTX *)dbio->ptr; | |
363 | memcpy(&(dctx->cipher), &(ctx->cipher), sizeof(ctx->cipher)); | |
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 | } | |
d02b48c6 | 372 | |
13083215 | 373 | static long enc_callback_ctrl(BIO *b, int cmd, bio_info_cb *fp) |
40720ce3 MC |
374 | { |
375 | long ret = 1; | |
376 | ||
377 | if (b->next_bio == NULL) | |
378 | return (0); | |
379 | switch (cmd) { | |
380 | default: | |
381 | ret = BIO_callback_ctrl(b->next_bio, cmd, fp); | |
382 | break; | |
383 | } | |
384 | return (ret); | |
385 | } | |
d3442bc7 | 386 | |
b558c8d5 | 387 | /*- |
58964a49 RE |
388 | void BIO_set_cipher_ctx(b,c) |
389 | BIO *b; | |
390 | EVP_CIPHER_ctx *c; | |
40720ce3 MC |
391 | { |
392 | if (b == NULL) return; | |
393 | ||
394 | if ((b->callback != NULL) && | |
395 | (b->callback(b,BIO_CB_CTRL,(char *)c,BIO_CTRL_SET,e,0L) <= 0)) | |
396 | return; | |
397 | ||
398 | b->init=1; | |
399 | ctx=(BIO_ENC_CTX *)b->ptr; | |
400 | memcpy(ctx->cipher,c,sizeof(EVP_CIPHER_CTX)); | |
401 | ||
402 | if (b->callback != NULL) | |
403 | b->callback(b,BIO_CB_CTRL,(char *)c,BIO_CTRL_SET,e,1L); | |
404 | } | |
58964a49 RE |
405 | */ |
406 | ||
875a644a | 407 | void BIO_set_cipher(BIO *b, const EVP_CIPHER *c, const unsigned char *k, |
40720ce3 MC |
408 | const unsigned char *i, int e) |
409 | { | |
410 | BIO_ENC_CTX *ctx; | |
d02b48c6 | 411 | |
40720ce3 MC |
412 | if (b == NULL) |
413 | return; | |
d02b48c6 | 414 | |
40720ce3 MC |
415 | if ((b->callback != NULL) && |
416 | (b->callback(b, BIO_CB_CTRL, (const char *)c, BIO_CTRL_SET, e, 0L) <= | |
417 | 0)) | |
418 | return; | |
d02b48c6 | 419 | |
40720ce3 MC |
420 | b->init = 1; |
421 | ctx = (BIO_ENC_CTX *)b->ptr; | |
422 | EVP_CipherInit_ex(&(ctx->cipher), c, NULL, k, i, e); | |
d02b48c6 | 423 | |
40720ce3 MC |
424 | if (b->callback != NULL) |
425 | b->callback(b, BIO_CB_CTRL, (const char *)c, BIO_CTRL_SET, e, 1L); | |
426 | } |