Line data Source code
1 : /*
2 : * openssl.c
3 : * Wrapper for OpenSSL library.
4 : *
5 : * Copyright (c) 2001 Marko Kreen
6 : * All rights reserved.
7 : *
8 : * Redistribution and use in source and binary forms, with or without
9 : * modification, are permitted provided that the following conditions
10 : * are met:
11 : * 1. Redistributions of source code must retain the above copyright
12 : * notice, this list of conditions and the following disclaimer.
13 : * 2. Redistributions in binary form must reproduce the above copyright
14 : * notice, this list of conditions and the following disclaimer in the
15 : * documentation and/or other materials provided with the distribution.
16 : *
17 : * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
18 : * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 : * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 : * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
21 : * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 : * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 : * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 : * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 : * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 : * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 : * SUCH DAMAGE.
28 : *
29 : * contrib/pgcrypto/openssl.c
30 : */
31 :
32 : #include "postgres.h"
33 :
34 : #include <openssl/evp.h>
35 : #include <openssl/err.h>
36 : #include <openssl/rand.h>
37 :
38 : #include "px.h"
39 : #include "utils/memutils.h"
40 : #include "utils/resowner.h"
41 :
42 : /*
43 : * Max lengths we might want to handle.
44 : */
45 : #define MAX_KEY (512/8)
46 : #define MAX_IV (128/8)
47 :
48 : /*
49 : * Hashes
50 : */
51 :
52 : /*
53 : * To make sure we don't leak OpenSSL handles, we use the ResourceOwner
54 : * mechanism to free them on abort.
55 : */
56 : typedef struct OSSLDigest
57 : {
58 : const EVP_MD *algo;
59 : EVP_MD_CTX *ctx;
60 :
61 : ResourceOwner owner;
62 : } OSSLDigest;
63 :
64 : /* ResourceOwner callbacks to hold OpenSSL digest handles */
65 : static void ResOwnerReleaseOSSLDigest(Datum res);
66 :
67 : static const ResourceOwnerDesc ossldigest_resowner_desc =
68 : {
69 : .name = "pgcrypto OpenSSL digest handle",
70 : .release_phase = RESOURCE_RELEASE_BEFORE_LOCKS,
71 : .release_priority = RELEASE_PRIO_FIRST,
72 : .ReleaseResource = ResOwnerReleaseOSSLDigest,
73 : .DebugPrint = NULL, /* default message is fine */
74 : };
75 :
76 : /* Convenience wrappers over ResourceOwnerRemember/Forget */
77 : static inline void
78 596 : ResourceOwnerRememberOSSLDigest(ResourceOwner owner, OSSLDigest *digest)
79 : {
80 596 : ResourceOwnerRemember(owner, PointerGetDatum(digest), &ossldigest_resowner_desc);
81 596 : }
82 : static inline void
83 596 : ResourceOwnerForgetOSSLDigest(ResourceOwner owner, OSSLDigest *digest)
84 : {
85 596 : ResourceOwnerForget(owner, PointerGetDatum(digest), &ossldigest_resowner_desc);
86 596 : }
87 :
88 : static void
89 596 : free_openssl_digest(OSSLDigest *digest)
90 : {
91 596 : EVP_MD_CTX_destroy(digest->ctx);
92 596 : if (digest->owner != NULL)
93 596 : ResourceOwnerForgetOSSLDigest(digest->owner, digest);
94 596 : pfree(digest);
95 596 : }
96 :
97 : static unsigned
98 328 : digest_result_size(PX_MD *h)
99 : {
100 328 : OSSLDigest *digest = (OSSLDigest *) h->p.ptr;
101 328 : int result = EVP_MD_CTX_size(digest->ctx);
102 :
103 328 : if (result < 0)
104 0 : elog(ERROR, "EVP_MD_CTX_size() failed");
105 :
106 328 : return result;
107 : }
108 :
109 : static unsigned
110 112 : digest_block_size(PX_MD *h)
111 : {
112 112 : OSSLDigest *digest = (OSSLDigest *) h->p.ptr;
113 112 : int result = EVP_MD_CTX_block_size(digest->ctx);
114 :
115 112 : if (result < 0)
116 0 : elog(ERROR, "EVP_MD_CTX_block_size() failed");
117 :
118 112 : return result;
119 : }
120 :
121 : static void
122 8256 : digest_reset(PX_MD *h)
123 : {
124 8256 : OSSLDigest *digest = (OSSLDigest *) h->p.ptr;
125 :
126 8256 : if (!EVP_DigestInit_ex(digest->ctx, digest->algo, NULL))
127 0 : elog(ERROR, "EVP_DigestInit_ex() failed");
128 8256 : }
129 :
130 : static void
131 51133948 : digest_update(PX_MD *h, const uint8 *data, unsigned dlen)
132 : {
133 51133948 : OSSLDigest *digest = (OSSLDigest *) h->p.ptr;
134 :
135 51133948 : if (!EVP_DigestUpdate(digest->ctx, data, dlen))
136 0 : elog(ERROR, "EVP_DigestUpdate() failed");
137 51133948 : }
138 :
139 : static void
140 8660 : digest_finish(PX_MD *h, uint8 *dst)
141 : {
142 8660 : OSSLDigest *digest = (OSSLDigest *) h->p.ptr;
143 :
144 8660 : if (!EVP_DigestFinal_ex(digest->ctx, dst, NULL))
145 0 : elog(ERROR, "EVP_DigestFinal_ex() failed");
146 8660 : }
147 :
148 : static void
149 596 : digest_free(PX_MD *h)
150 : {
151 596 : OSSLDigest *digest = (OSSLDigest *) h->p.ptr;
152 :
153 596 : free_openssl_digest(digest);
154 596 : pfree(h);
155 596 : }
156 :
157 : /* PUBLIC functions */
158 :
159 : int
160 600 : px_find_digest(const char *name, PX_MD **res)
161 : {
162 : const EVP_MD *md;
163 : EVP_MD_CTX *ctx;
164 : PX_MD *h;
165 : OSSLDigest *digest;
166 :
167 600 : md = EVP_get_digestbyname(name);
168 600 : if (md == NULL)
169 4 : return PXE_NO_HASH;
170 :
171 596 : ResourceOwnerEnlarge(CurrentResourceOwner);
172 :
173 : /*
174 : * Create an OSSLDigest object, an OpenSSL MD object, and a PX_MD object.
175 : * The order is crucial, to make sure we don't leak anything on
176 : * out-of-memory or other error.
177 : */
178 596 : digest = MemoryContextAlloc(TopMemoryContext, sizeof(*digest));
179 :
180 596 : ctx = EVP_MD_CTX_create();
181 596 : if (!ctx)
182 : {
183 0 : pfree(digest);
184 0 : return PXE_CIPHER_INIT;
185 : }
186 596 : if (EVP_DigestInit_ex(ctx, md, NULL) == 0)
187 : {
188 0 : EVP_MD_CTX_destroy(ctx);
189 0 : pfree(digest);
190 0 : return PXE_CIPHER_INIT;
191 : }
192 :
193 596 : digest->algo = md;
194 596 : digest->ctx = ctx;
195 596 : digest->owner = CurrentResourceOwner;
196 596 : ResourceOwnerRememberOSSLDigest(digest->owner, digest);
197 :
198 : /* The PX_MD object is allocated in the current memory context. */
199 596 : h = palloc(sizeof(*h));
200 596 : h->result_size = digest_result_size;
201 596 : h->block_size = digest_block_size;
202 596 : h->reset = digest_reset;
203 596 : h->update = digest_update;
204 596 : h->finish = digest_finish;
205 596 : h->free = digest_free;
206 596 : h->p.ptr = (void *) digest;
207 :
208 596 : *res = h;
209 596 : return 0;
210 : }
211 :
212 : /* ResourceOwner callbacks for OSSLDigest */
213 :
214 : static void
215 0 : ResOwnerReleaseOSSLDigest(Datum res)
216 : {
217 0 : OSSLDigest *digest = (OSSLDigest *) DatumGetPointer(res);
218 :
219 0 : digest->owner = NULL;
220 0 : free_openssl_digest(digest);
221 0 : }
222 :
223 : /*
224 : * Ciphers
225 : *
226 : * We use OpenSSL's EVP* family of functions for these.
227 : */
228 :
229 : /*
230 : * prototype for the EVP functions that return an algorithm, e.g.
231 : * EVP_aes_128_cbc().
232 : */
233 : typedef const EVP_CIPHER *(*ossl_EVP_cipher_func) (void);
234 :
235 : /*
236 : * ossl_cipher contains the static information about each cipher.
237 : */
238 : struct ossl_cipher
239 : {
240 : int (*init) (PX_Cipher *c, const uint8 *key, unsigned klen, const uint8 *iv);
241 : ossl_EVP_cipher_func cipher_func;
242 : int block_size;
243 : int max_key_size;
244 : };
245 :
246 : /*
247 : * OSSLCipher contains the state for using a cipher. A separate OSSLCipher
248 : * object is allocated in each px_find_cipher() call.
249 : *
250 : * To make sure we don't leak OpenSSL handles, we use the ResourceOwner
251 : * mechanism to free them on abort.
252 : */
253 : typedef struct OSSLCipher
254 : {
255 : EVP_CIPHER_CTX *evp_ctx;
256 : const EVP_CIPHER *evp_ciph;
257 : uint8 key[MAX_KEY];
258 : uint8 iv[MAX_IV];
259 : unsigned klen;
260 : unsigned init;
261 : const struct ossl_cipher *ciph;
262 :
263 : ResourceOwner owner;
264 : } OSSLCipher;
265 :
266 : /* ResourceOwner callbacks to hold OpenSSL cipher state */
267 : static void ResOwnerReleaseOSSLCipher(Datum res);
268 :
269 : static const ResourceOwnerDesc osslcipher_resowner_desc =
270 : {
271 : .name = "pgcrypto OpenSSL cipher handle",
272 : .release_phase = RESOURCE_RELEASE_BEFORE_LOCKS,
273 : .release_priority = RELEASE_PRIO_FIRST,
274 : .ReleaseResource = ResOwnerReleaseOSSLCipher,
275 : .DebugPrint = NULL, /* default message is fine */
276 : };
277 :
278 : /* Convenience wrappers over ResourceOwnerRemember/Forget */
279 : static inline void
280 392 : ResourceOwnerRememberOSSLCipher(ResourceOwner owner, OSSLCipher *od)
281 : {
282 392 : ResourceOwnerRemember(owner, PointerGetDatum(od), &osslcipher_resowner_desc);
283 392 : }
284 : static inline void
285 392 : ResourceOwnerForgetOSSLCipher(ResourceOwner owner, OSSLCipher *od)
286 : {
287 392 : ResourceOwnerForget(owner, PointerGetDatum(od), &osslcipher_resowner_desc);
288 392 : }
289 :
290 : static void
291 392 : free_openssl_cipher(OSSLCipher *od)
292 : {
293 392 : EVP_CIPHER_CTX_free(od->evp_ctx);
294 392 : if (od->owner != NULL)
295 392 : ResourceOwnerForgetOSSLCipher(od->owner, od);
296 392 : pfree(od);
297 392 : }
298 :
299 : /* Common routines for all algorithms */
300 :
301 : static unsigned
302 632 : gen_ossl_block_size(PX_Cipher *c)
303 : {
304 632 : OSSLCipher *od = (OSSLCipher *) c->ptr;
305 :
306 632 : return od->ciph->block_size;
307 : }
308 :
309 : static unsigned
310 152 : gen_ossl_key_size(PX_Cipher *c)
311 : {
312 152 : OSSLCipher *od = (OSSLCipher *) c->ptr;
313 :
314 152 : return od->ciph->max_key_size;
315 : }
316 :
317 : static unsigned
318 152 : gen_ossl_iv_size(PX_Cipher *c)
319 : {
320 : unsigned ivlen;
321 152 : OSSLCipher *od = (OSSLCipher *) c->ptr;
322 :
323 152 : ivlen = od->ciph->block_size;
324 152 : return ivlen;
325 : }
326 :
327 : static void
328 392 : gen_ossl_free(PX_Cipher *c)
329 : {
330 392 : OSSLCipher *od = (OSSLCipher *) c->ptr;
331 :
332 392 : free_openssl_cipher(od);
333 392 : pfree(c);
334 392 : }
335 :
336 : static int
337 34 : gen_ossl_decrypt(PX_Cipher *c, int padding, const uint8 *data, unsigned dlen,
338 : uint8 *res, unsigned *rlen)
339 : {
340 34 : OSSLCipher *od = c->ptr;
341 : int outlen,
342 : outlen2;
343 :
344 34 : if (!od->init)
345 : {
346 34 : if (!EVP_DecryptInit_ex(od->evp_ctx, od->evp_ciph, NULL, NULL, NULL))
347 0 : return PXE_CIPHER_INIT;
348 34 : if (!EVP_CIPHER_CTX_set_padding(od->evp_ctx, padding))
349 0 : return PXE_CIPHER_INIT;
350 34 : if (!EVP_CIPHER_CTX_set_key_length(od->evp_ctx, od->klen))
351 0 : return PXE_CIPHER_INIT;
352 34 : if (!EVP_DecryptInit_ex(od->evp_ctx, NULL, NULL, od->key, od->iv))
353 0 : return PXE_CIPHER_INIT;
354 34 : od->init = true;
355 : }
356 :
357 34 : if (!EVP_DecryptUpdate(od->evp_ctx, res, &outlen, data, dlen))
358 0 : return PXE_DECRYPT_FAILED;
359 34 : if (!EVP_DecryptFinal_ex(od->evp_ctx, res + outlen, &outlen2))
360 4 : return PXE_DECRYPT_FAILED;
361 30 : *rlen = outlen + outlen2;
362 :
363 30 : return 0;
364 : }
365 :
366 : static int
367 21766 : gen_ossl_encrypt(PX_Cipher *c, int padding, const uint8 *data, unsigned dlen,
368 : uint8 *res, unsigned *rlen)
369 : {
370 21766 : OSSLCipher *od = c->ptr;
371 : int outlen,
372 : outlen2;
373 :
374 21766 : if (!od->init)
375 : {
376 358 : if (!EVP_EncryptInit_ex(od->evp_ctx, od->evp_ciph, NULL, NULL, NULL))
377 0 : return PXE_CIPHER_INIT;
378 358 : if (!EVP_CIPHER_CTX_set_padding(od->evp_ctx, padding))
379 0 : return PXE_CIPHER_INIT;
380 358 : if (!EVP_CIPHER_CTX_set_key_length(od->evp_ctx, od->klen))
381 0 : return PXE_CIPHER_INIT;
382 358 : if (!EVP_EncryptInit_ex(od->evp_ctx, NULL, NULL, od->key, od->iv))
383 0 : return PXE_CIPHER_INIT;
384 358 : od->init = true;
385 : }
386 :
387 21766 : if (!EVP_EncryptUpdate(od->evp_ctx, res, &outlen, data, dlen))
388 0 : return PXE_ENCRYPT_FAILED;
389 21766 : if (!EVP_EncryptFinal_ex(od->evp_ctx, res + outlen, &outlen2))
390 2 : return PXE_ENCRYPT_FAILED;
391 21764 : *rlen = outlen + outlen2;
392 :
393 21764 : return 0;
394 : }
395 :
396 : /* Blowfish */
397 :
398 : /*
399 : * Check if strong crypto is supported. Some OpenSSL installations
400 : * support only short keys and unfortunately BF_set_key does not return any
401 : * error value. This function tests if is possible to use strong key.
402 : */
403 : static int
404 8 : bf_check_supported_key_len(void)
405 : {
406 : static const uint8 key[56] = {
407 : 0xf0, 0xe1, 0xd2, 0xc3, 0xb4, 0xa5, 0x96, 0x87, 0x78, 0x69,
408 : 0x5a, 0x4b, 0x3c, 0x2d, 0x1e, 0x0f, 0x00, 0x11, 0x22, 0x33,
409 : 0x44, 0x55, 0x66, 0x77, 0x04, 0x68, 0x91, 0x04, 0xc2, 0xfd,
410 : 0x3b, 0x2f, 0x58, 0x40, 0x23, 0x64, 0x1a, 0xba, 0x61, 0x76,
411 : 0x1f, 0x1f, 0x1f, 0x1f, 0x0e, 0x0e, 0x0e, 0x0e, 0xff, 0xff,
412 : 0xff, 0xff, 0xff, 0xff, 0xff, 0xff
413 : };
414 :
415 : static const uint8 data[8] = {0xfe, 0xdc, 0xba, 0x98, 0x76, 0x54, 0x32, 0x10};
416 : static const uint8 res[8] = {0xc0, 0x45, 0x04, 0x01, 0x2e, 0x4e, 0x1f, 0x53};
417 : uint8 out[8];
418 : EVP_CIPHER_CTX *evp_ctx;
419 : int outlen;
420 8 : int status = 0;
421 :
422 : /* encrypt with 448bits key and verify output */
423 8 : evp_ctx = EVP_CIPHER_CTX_new();
424 8 : if (!evp_ctx)
425 0 : return 0;
426 8 : if (!EVP_EncryptInit_ex(evp_ctx, EVP_bf_ecb(), NULL, NULL, NULL))
427 0 : goto leave;
428 8 : if (!EVP_CIPHER_CTX_set_key_length(evp_ctx, 56))
429 0 : goto leave;
430 8 : if (!EVP_EncryptInit_ex(evp_ctx, NULL, NULL, key, NULL))
431 0 : goto leave;
432 :
433 8 : if (!EVP_EncryptUpdate(evp_ctx, out, &outlen, data, 8))
434 0 : goto leave;
435 :
436 8 : if (memcmp(out, res, 8) != 0)
437 0 : goto leave; /* Output does not match -> strong cipher is
438 : * not supported */
439 8 : status = 1;
440 :
441 8 : leave:
442 8 : EVP_CIPHER_CTX_free(evp_ctx);
443 8 : return status;
444 : }
445 :
446 : static int
447 60 : bf_init(PX_Cipher *c, const uint8 *key, unsigned klen, const uint8 *iv)
448 : {
449 60 : OSSLCipher *od = c->ptr;
450 60 : unsigned bs = gen_ossl_block_size(c);
451 : static int bf_is_strong = -1;
452 :
453 : /*
454 : * Test if key len is supported. BF_set_key silently cut large keys and it
455 : * could be a problem when user transfer encrypted data from one server to
456 : * another.
457 : */
458 :
459 60 : if (bf_is_strong == -1)
460 8 : bf_is_strong = bf_check_supported_key_len();
461 :
462 60 : if (!bf_is_strong && klen > 16)
463 0 : return PXE_KEY_TOO_BIG;
464 :
465 : /* Key len is supported. We can use it. */
466 60 : od->klen = klen;
467 60 : memcpy(od->key, key, klen);
468 :
469 60 : if (iv)
470 44 : memcpy(od->iv, iv, bs);
471 : else
472 16 : memset(od->iv, 0, bs);
473 60 : return 0;
474 : }
475 :
476 : /* DES */
477 :
478 : static int
479 20 : ossl_des_init(PX_Cipher *c, const uint8 *key, unsigned klen, const uint8 *iv)
480 : {
481 20 : OSSLCipher *od = c->ptr;
482 20 : unsigned bs = gen_ossl_block_size(c);
483 :
484 20 : od->klen = 8;
485 20 : memset(od->key, 0, 8);
486 20 : memcpy(od->key, key, klen > 8 ? 8 : klen);
487 :
488 20 : if (iv)
489 20 : memcpy(od->iv, iv, bs);
490 : else
491 0 : memset(od->iv, 0, bs);
492 20 : return 0;
493 : }
494 :
495 : /* DES3 */
496 :
497 : static int
498 22 : ossl_des3_init(PX_Cipher *c, const uint8 *key, unsigned klen, const uint8 *iv)
499 : {
500 22 : OSSLCipher *od = c->ptr;
501 22 : unsigned bs = gen_ossl_block_size(c);
502 :
503 22 : od->klen = 24;
504 22 : memset(od->key, 0, 24);
505 22 : memcpy(od->key, key, klen > 24 ? 24 : klen);
506 :
507 22 : if (iv)
508 22 : memcpy(od->iv, iv, bs);
509 : else
510 0 : memset(od->iv, 0, bs);
511 22 : return 0;
512 : }
513 :
514 : /* CAST5 */
515 :
516 : static int
517 24 : ossl_cast_init(PX_Cipher *c, const uint8 *key, unsigned klen, const uint8 *iv)
518 : {
519 24 : OSSLCipher *od = c->ptr;
520 24 : unsigned bs = gen_ossl_block_size(c);
521 :
522 24 : od->klen = klen;
523 24 : memcpy(od->key, key, klen);
524 :
525 24 : if (iv)
526 24 : memcpy(od->iv, iv, bs);
527 : else
528 0 : memset(od->iv, 0, bs);
529 24 : return 0;
530 : }
531 :
532 : /* AES */
533 :
534 : static int
535 266 : ossl_aes_init(PX_Cipher *c, const uint8 *key, unsigned klen, const uint8 *iv)
536 : {
537 266 : OSSLCipher *od = c->ptr;
538 266 : unsigned bs = gen_ossl_block_size(c);
539 :
540 266 : if (klen <= 128 / 8)
541 208 : od->klen = 128 / 8;
542 58 : else if (klen <= 192 / 8)
543 26 : od->klen = 192 / 8;
544 32 : else if (klen <= 256 / 8)
545 32 : od->klen = 256 / 8;
546 : else
547 0 : return PXE_KEY_TOO_BIG;
548 :
549 266 : memcpy(od->key, key, klen);
550 :
551 266 : if (iv)
552 42 : memcpy(od->iv, iv, bs);
553 : else
554 224 : memset(od->iv, 0, bs);
555 :
556 266 : return 0;
557 : }
558 :
559 : static int
560 230 : ossl_aes_ecb_init(PX_Cipher *c, const uint8 *key, unsigned klen, const uint8 *iv)
561 : {
562 230 : OSSLCipher *od = c->ptr;
563 : int err;
564 :
565 230 : err = ossl_aes_init(c, key, klen, iv);
566 230 : if (err)
567 0 : return err;
568 :
569 230 : switch (od->klen)
570 : {
571 182 : case 128 / 8:
572 182 : od->evp_ciph = EVP_aes_128_ecb();
573 182 : break;
574 22 : case 192 / 8:
575 22 : od->evp_ciph = EVP_aes_192_ecb();
576 22 : break;
577 26 : case 256 / 8:
578 26 : od->evp_ciph = EVP_aes_256_ecb();
579 26 : break;
580 0 : default:
581 : /* shouldn't happen */
582 0 : err = PXE_CIPHER_INIT;
583 0 : break;
584 : }
585 :
586 230 : return err;
587 : }
588 :
589 : static int
590 36 : ossl_aes_cbc_init(PX_Cipher *c, const uint8 *key, unsigned klen, const uint8 *iv)
591 : {
592 36 : OSSLCipher *od = c->ptr;
593 : int err;
594 :
595 36 : err = ossl_aes_init(c, key, klen, iv);
596 36 : if (err)
597 0 : return err;
598 :
599 36 : switch (od->klen)
600 : {
601 26 : case 128 / 8:
602 26 : od->evp_ciph = EVP_aes_128_cbc();
603 26 : break;
604 4 : case 192 / 8:
605 4 : od->evp_ciph = EVP_aes_192_cbc();
606 4 : break;
607 6 : case 256 / 8:
608 6 : od->evp_ciph = EVP_aes_256_cbc();
609 6 : break;
610 0 : default:
611 : /* shouldn't happen */
612 0 : err = PXE_CIPHER_INIT;
613 0 : break;
614 : }
615 :
616 36 : return err;
617 : }
618 :
619 : /*
620 : * aliases
621 : */
622 :
623 : static PX_Alias ossl_aliases[] = {
624 : {"bf", "bf-cbc"},
625 : {"blowfish", "bf-cbc"},
626 : {"blowfish-cbc", "bf-cbc"},
627 : {"blowfish-ecb", "bf-ecb"},
628 : {"blowfish-cfb", "bf-cfb"},
629 : {"des", "des-cbc"},
630 : {"3des", "des3-cbc"},
631 : {"3des-ecb", "des3-ecb"},
632 : {"3des-cbc", "des3-cbc"},
633 : {"cast5", "cast5-cbc"},
634 : {"aes", "aes-cbc"},
635 : {"rijndael", "aes-cbc"},
636 : {"rijndael-cbc", "aes-cbc"},
637 : {"rijndael-ecb", "aes-ecb"},
638 : {NULL}
639 : };
640 :
641 : static const struct ossl_cipher ossl_bf_cbc = {
642 : bf_init,
643 : EVP_bf_cbc,
644 : 64 / 8, 448 / 8
645 : };
646 :
647 : static const struct ossl_cipher ossl_bf_ecb = {
648 : bf_init,
649 : EVP_bf_ecb,
650 : 64 / 8, 448 / 8
651 : };
652 :
653 : static const struct ossl_cipher ossl_bf_cfb = {
654 : bf_init,
655 : EVP_bf_cfb,
656 : 64 / 8, 448 / 8
657 : };
658 :
659 : static const struct ossl_cipher ossl_des_ecb = {
660 : ossl_des_init,
661 : EVP_des_ecb,
662 : 64 / 8, 64 / 8
663 : };
664 :
665 : static const struct ossl_cipher ossl_des_cbc = {
666 : ossl_des_init,
667 : EVP_des_cbc,
668 : 64 / 8, 64 / 8
669 : };
670 :
671 : static const struct ossl_cipher ossl_des3_ecb = {
672 : ossl_des3_init,
673 : EVP_des_ede3_ecb,
674 : 64 / 8, 192 / 8
675 : };
676 :
677 : static const struct ossl_cipher ossl_des3_cbc = {
678 : ossl_des3_init,
679 : EVP_des_ede3_cbc,
680 : 64 / 8, 192 / 8
681 : };
682 :
683 : static const struct ossl_cipher ossl_cast_ecb = {
684 : ossl_cast_init,
685 : EVP_cast5_ecb,
686 : 64 / 8, 128 / 8
687 : };
688 :
689 : static const struct ossl_cipher ossl_cast_cbc = {
690 : ossl_cast_init,
691 : EVP_cast5_cbc,
692 : 64 / 8, 128 / 8
693 : };
694 :
695 : static const struct ossl_cipher ossl_aes_ecb = {
696 : ossl_aes_ecb_init,
697 : NULL, /* EVP_aes_XXX_ecb(), determined in init
698 : * function */
699 : 128 / 8, 256 / 8
700 : };
701 :
702 : static const struct ossl_cipher ossl_aes_cbc = {
703 : ossl_aes_cbc_init,
704 : NULL, /* EVP_aes_XXX_cbc(), determined in init
705 : * function */
706 : 128 / 8, 256 / 8
707 : };
708 :
709 : /*
710 : * Special handlers
711 : */
712 : struct ossl_cipher_lookup
713 : {
714 : const char *name;
715 : const struct ossl_cipher *ciph;
716 : };
717 :
718 : static const struct ossl_cipher_lookup ossl_cipher_types[] = {
719 : {"bf-cbc", &ossl_bf_cbc},
720 : {"bf-ecb", &ossl_bf_ecb},
721 : {"bf-cfb", &ossl_bf_cfb},
722 : {"des-ecb", &ossl_des_ecb},
723 : {"des-cbc", &ossl_des_cbc},
724 : {"des3-ecb", &ossl_des3_ecb},
725 : {"des3-cbc", &ossl_des3_cbc},
726 : {"cast5-ecb", &ossl_cast_ecb},
727 : {"cast5-cbc", &ossl_cast_cbc},
728 : {"aes-ecb", &ossl_aes_ecb},
729 : {"aes-cbc", &ossl_aes_cbc},
730 : {NULL}
731 : };
732 :
733 : /* PUBLIC functions */
734 :
735 : int
736 394 : px_find_cipher(const char *name, PX_Cipher **res)
737 : {
738 : const struct ossl_cipher_lookup *i;
739 394 : PX_Cipher *c = NULL;
740 : EVP_CIPHER_CTX *ctx;
741 : OSSLCipher *od;
742 :
743 394 : name = px_resolve_alias(ossl_aliases, name);
744 3276 : for (i = ossl_cipher_types; i->name; i++)
745 3274 : if (strcmp(i->name, name) == 0)
746 392 : break;
747 394 : if (i->name == NULL)
748 2 : return PXE_NO_CIPHER;
749 :
750 392 : ResourceOwnerEnlarge(CurrentResourceOwner);
751 :
752 : /*
753 : * Create an OSSLCipher object, an EVP_CIPHER_CTX object and a PX_Cipher.
754 : * The order is crucial, to make sure we don't leak anything on
755 : * out-of-memory or other error.
756 : */
757 392 : od = MemoryContextAllocZero(TopMemoryContext, sizeof(*od));
758 392 : od->ciph = i->ciph;
759 :
760 : /* Allocate an EVP_CIPHER_CTX object. */
761 392 : ctx = EVP_CIPHER_CTX_new();
762 392 : if (!ctx)
763 : {
764 0 : pfree(od);
765 0 : return PXE_CIPHER_INIT;
766 : }
767 :
768 392 : od->evp_ctx = ctx;
769 392 : od->owner = CurrentResourceOwner;
770 392 : ResourceOwnerRememberOSSLCipher(od->owner, od);
771 :
772 392 : if (i->ciph->cipher_func)
773 126 : od->evp_ciph = i->ciph->cipher_func();
774 :
775 : /* The PX_Cipher is allocated in current memory context */
776 392 : c = palloc(sizeof(*c));
777 392 : c->block_size = gen_ossl_block_size;
778 392 : c->key_size = gen_ossl_key_size;
779 392 : c->iv_size = gen_ossl_iv_size;
780 392 : c->free = gen_ossl_free;
781 392 : c->init = od->ciph->init;
782 392 : c->encrypt = gen_ossl_encrypt;
783 392 : c->decrypt = gen_ossl_decrypt;
784 392 : c->ptr = od;
785 :
786 392 : *res = c;
787 392 : return 0;
788 : }
789 :
790 : /* ResourceOwner callbacks for OSSLCipher */
791 :
792 : static void
793 0 : ResOwnerReleaseOSSLCipher(Datum res)
794 : {
795 0 : free_openssl_cipher((OSSLCipher *) DatumGetPointer(res));
796 0 : }
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