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git.ipfire.org Git - thirdparty/openssl.git/blob - crypto/evp/bio_enc.c
1 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
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.
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).
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.
22 * Redistribution and use in source and binary forms, with or without
23 * modification, are permitted provided that the following conditions
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 :-).
36 * 4. If you include any Windows specific code (or a derivative thereof) from
37 * the apps directory (application code) you must include an acknowledgement:
38 * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
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
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.]
60 #include "internal/cryptlib.h"
61 #include <openssl/buffer.h>
62 #include <openssl/evp.h>
64 static int enc_write(BIO
*h
, const char *buf
, int num
);
65 static int enc_read(BIO
*h
, char *buf
, int size
);
67 * static int enc_puts(BIO *h, const char *str);
70 * static int enc_gets(BIO *h, char *str, int size);
72 static long enc_ctrl(BIO
*h
, int cmd
, long arg1
, void *arg2
);
73 static int enc_new(BIO
*h
);
74 static int enc_free(BIO
*data
);
75 static long enc_callback_ctrl(BIO
*h
, int cmd
, bio_info_cb
*fps
);
76 #define ENC_BLOCK_SIZE (1024*4)
77 #define BUF_OFFSET (EVP_MAX_BLOCK_LENGTH*2)
79 typedef struct enc_struct
{
82 int cont
; /* <= 0 when finished */
84 int ok
; /* bad decrypt */
85 EVP_CIPHER_CTX
*cipher
;
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
90 char buf
[ENC_BLOCK_SIZE
+ BUF_OFFSET
+ 2];
93 static BIO_METHOD methods_enc
= {
94 BIO_TYPE_CIPHER
, "cipher",
105 BIO_METHOD
*BIO_f_cipher(void)
107 return (&methods_enc
);
110 static int enc_new(BIO
*bi
)
114 ctx
= OPENSSL_zalloc(sizeof(*ctx
));
118 ctx
->cipher
= EVP_CIPHER_CTX_new();
119 if (ctx
->cipher
== NULL
) {
126 bi
->ptr
= (char *)ctx
;
131 static int enc_free(BIO
*a
)
137 b
= (BIO_ENC_CTX
*)a
->ptr
;
138 EVP_CIPHER_CTX_free(b
->cipher
);
139 OPENSSL_clear_free(a
->ptr
, sizeof(BIO_ENC_CTX
));
146 static int enc_read(BIO
*b
, char *out
, int outl
)
153 ctx
= (BIO_ENC_CTX
*)b
->ptr
;
155 if ((ctx
== NULL
) || (b
->next_bio
== NULL
))
158 /* First check if there are bytes decoded/encoded */
159 if (ctx
->buf_len
> 0) {
160 i
= ctx
->buf_len
- ctx
->buf_off
;
163 memcpy(out
, &(ctx
->buf
[ctx
->buf_off
]), i
);
168 if (ctx
->buf_len
== ctx
->buf_off
) {
175 * At this point, we have room of outl bytes and an empty buffer, so we
176 * should read in some more.
184 * read in at IV offset, read the EVP_Cipher documentation about why
186 i
= BIO_read(b
->next_bio
, &(ctx
->buf
[BUF_OFFSET
]), ENC_BLOCK_SIZE
);
189 /* Should be continue next time we are called? */
190 if (!BIO_should_retry(b
->next_bio
)) {
192 i
= EVP_CipherFinal_ex(ctx
->cipher
,
193 (unsigned char *)ctx
->buf
,
198 ret
= (ret
== 0) ? i
: ret
;
202 if (!EVP_CipherUpdate(ctx
->cipher
,
203 (unsigned char *)ctx
->buf
, &ctx
->buf_len
,
204 (unsigned char *)&(ctx
->buf
[BUF_OFFSET
]),
206 BIO_clear_retry_flags(b
);
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
216 if (ctx
->buf_len
== 0)
220 if (ctx
->buf_len
<= outl
)
226 memcpy(out
, ctx
->buf
, i
);
233 BIO_clear_retry_flags(b
);
234 BIO_copy_next_retry(b
);
235 return ((ret
== 0) ? ctx
->cont
: ret
);
238 static int enc_write(BIO
*b
, const char *in
, int inl
)
243 ctx
= (BIO_ENC_CTX
*)b
->ptr
;
246 BIO_clear_retry_flags(b
);
247 n
= ctx
->buf_len
- ctx
->buf_off
;
249 i
= BIO_write(b
->next_bio
, &(ctx
->buf
[ctx
->buf_off
]), n
);
251 BIO_copy_next_retry(b
);
257 /* at this point all pending data has been written */
259 if ((in
== NULL
) || (inl
<= 0))
264 n
= (inl
> ENC_BLOCK_SIZE
) ? ENC_BLOCK_SIZE
: inl
;
265 if (!EVP_CipherUpdate(ctx
->cipher
,
266 (unsigned char *)ctx
->buf
, &ctx
->buf_len
,
267 (unsigned char *)in
, n
)) {
268 BIO_clear_retry_flags(b
);
277 i
= BIO_write(b
->next_bio
, &(ctx
->buf
[ctx
->buf_off
]), n
);
279 BIO_copy_next_retry(b
);
280 return (ret
== inl
) ? i
: ret
- inl
;
288 BIO_copy_next_retry(b
);
292 static long enc_ctrl(BIO
*b
, int cmd
, long num
, void *ptr
)
295 BIO_ENC_CTX
*ctx
, *dctx
;
298 EVP_CIPHER_CTX
**c_ctx
;
300 ctx
= (BIO_ENC_CTX
*)b
->ptr
;
306 if (!EVP_CipherInit_ex(ctx
->cipher
, NULL
, NULL
, NULL
, NULL
,
307 EVP_CIPHER_CTX_encrypting(ctx
->cipher
)))
309 ret
= BIO_ctrl(b
->next_bio
, cmd
, num
, ptr
);
311 case BIO_CTRL_EOF
: /* More to read */
315 ret
= BIO_ctrl(b
->next_bio
, cmd
, num
, ptr
);
317 case BIO_CTRL_WPENDING
:
318 ret
= ctx
->buf_len
- ctx
->buf_off
;
320 ret
= BIO_ctrl(b
->next_bio
, cmd
, num
, ptr
);
322 case BIO_CTRL_PENDING
: /* More to read in buffer */
323 ret
= ctx
->buf_len
- ctx
->buf_off
;
325 ret
= BIO_ctrl(b
->next_bio
, cmd
, num
, ptr
);
328 /* do a final write */
330 while (ctx
->buf_len
!= ctx
->buf_off
) {
331 i
= enc_write(b
, NULL
, 0);
336 if (!ctx
->finished
) {
339 ret
= EVP_CipherFinal_ex(ctx
->cipher
,
340 (unsigned char *)ctx
->buf
,
346 /* push out the bytes */
350 /* Finally flush the underlying BIO */
351 ret
= BIO_ctrl(b
->next_bio
, cmd
, num
, ptr
);
353 case BIO_C_GET_CIPHER_STATUS
:
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
);
361 case BIO_C_GET_CIPHER_CTX
:
362 c_ctx
= (EVP_CIPHER_CTX
**)ptr
;
363 *c_ctx
= ctx
->cipher
;
368 dctx
= (BIO_ENC_CTX
*)dbio
->ptr
;
369 dctx
->cipher
= EVP_CIPHER_CTX_new();
370 if (dctx
->cipher
== NULL
)
372 ret
= EVP_CIPHER_CTX_copy(dctx
->cipher
, ctx
->cipher
);
377 ret
= BIO_ctrl(b
->next_bio
, cmd
, num
, ptr
);
383 static long enc_callback_ctrl(BIO
*b
, int cmd
, bio_info_cb
*fp
)
387 if (b
->next_bio
== NULL
)
391 ret
= BIO_callback_ctrl(b
->next_bio
, cmd
, fp
);
398 void BIO_set_cipher_ctx(b,c)
402 if (b == NULL) return;
404 if ((b->callback != NULL) &&
405 (b->callback(b,BIO_CB_CTRL,(char *)c,BIO_CTRL_SET,e,0L) <= 0))
409 ctx=(BIO_ENC_CTX *)b->ptr;
410 memcpy(ctx->cipher,c,sizeof(EVP_CIPHER_CTX));
412 if (b->callback != NULL)
413 b->callback(b,BIO_CB_CTRL,(char *)c,BIO_CTRL_SET,e,1L);
417 int BIO_set_cipher(BIO
*b
, const EVP_CIPHER
*c
, const unsigned char *k
,
418 const unsigned char *i
, int e
)
425 if ((b
->callback
!= NULL
) &&
426 (b
->callback(b
, BIO_CB_CTRL
, (const char *)c
, BIO_CTRL_SET
, e
, 0L) <=
431 ctx
= (BIO_ENC_CTX
*)b
->ptr
;
432 if (!EVP_CipherInit_ex(ctx
->cipher
, c
, NULL
, k
, i
, e
))
435 if (b
->callback
!= NULL
)
436 return b
->callback(b
, BIO_CB_CTRL
, (const char *)c
, BIO_CTRL_SET
, e
,