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1 /* crypto/evp/bio_enc.c */
2 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
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.
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).
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.
23 * Redistribution and use in source and binary forms, with or without
24 * modification, are permitted provided that the following conditions
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)"
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
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.]
62 #include <openssl/buffer.h>
63 #include <openssl/evp.h>
65 static int enc_write(BIO
*h
, const char *buf
, int num
);
66 static int enc_read(BIO
*h
, char *buf
, int size
);
67 /*static int enc_puts(BIO *h, const char *str); */
68 /*static int enc_gets(BIO *h, char *str, int size); */
69 static long enc_ctrl(BIO
*h
, int cmd
, long arg1
, void *arg2
);
70 static int enc_new(BIO
*h
);
71 static int enc_free(BIO
*data
);
72 static long enc_callback_ctrl(BIO
*h
, int cmd
, bio_info_cb
*fps
);
73 #define ENC_BLOCK_SIZE (1024*4)
75 typedef struct enc_struct
79 int cont
; /* <= 0 when finished */
81 int ok
; /* bad decrypt */
82 EVP_CIPHER_CTX cipher
;
83 char buf
[ENC_BLOCK_SIZE
+10];
86 static BIO_METHOD methods_enc
=
88 BIO_TYPE_CIPHER
,"cipher",
99 BIO_METHOD
*BIO_f_cipher(void)
101 return(&methods_enc
);
104 static int enc_new(BIO
*bi
)
108 ctx
=(BIO_ENC_CTX
*)OPENSSL_malloc(sizeof(BIO_ENC_CTX
));
109 EVP_CIPHER_CTX_init(&ctx
->cipher
);
110 if (ctx
== NULL
) return(0);
124 static int enc_free(BIO
*a
)
128 if (a
== NULL
) return(0);
129 b
=(BIO_ENC_CTX
*)a
->ptr
;
130 EVP_CIPHER_CTX_cleanup(&(b
->cipher
));
131 memset(a
->ptr
,0,sizeof(BIO_ENC_CTX
));
132 OPENSSL_free(a
->ptr
);
139 static int enc_read(BIO
*b
, char *out
, int outl
)
144 if (out
== NULL
) return(0);
145 ctx
=(BIO_ENC_CTX
*)b
->ptr
;
147 if ((ctx
== NULL
) || (b
->next_bio
== NULL
)) return(0);
149 /* First check if there are bytes decoded/encoded */
150 if (ctx
->buf_len
> 0)
152 i
=ctx
->buf_len
-ctx
->buf_off
;
153 if (i
> outl
) i
=outl
;
154 memcpy(out
,&(ctx
->buf
[ctx
->buf_off
]),i
);
159 if (ctx
->buf_len
== ctx
->buf_off
)
166 /* At this point, we have room of outl bytes and an empty
167 * buffer, so we should read in some more. */
171 if (ctx
->cont
<= 0) break;
173 /* read in at offset 8, read the EVP_Cipher
174 * documentation about why */
175 i
=BIO_read(b
->next_bio
,&(ctx
->buf
[8]),ENC_BLOCK_SIZE
);
179 /* Should be continue next time we are called? */
180 if (!BIO_should_retry(b
->next_bio
))
183 i
=EVP_CipherFinal(&(ctx
->cipher
),
184 (unsigned char *)ctx
->buf
,
191 ret
=(ret
== 0)?i
:ret
;
197 EVP_CipherUpdate(&(ctx
->cipher
),
198 (unsigned char *)ctx
->buf
,&ctx
->buf_len
,
199 (unsigned char *)&(ctx
->buf
[8]),i
);
201 /* Note: it is possible for EVP_CipherUpdate to
202 * decrypt zero bytes because this is or looks like
203 * the final block: if this happens we should retry
204 * and either read more data or decrypt the final
207 if(ctx
->buf_len
== 0) continue;
210 if (ctx
->buf_len
<= outl
)
215 memcpy(out
,ctx
->buf
,i
);
222 BIO_clear_retry_flags(b
);
223 BIO_copy_next_retry(b
);
224 return((ret
== 0)?ctx
->cont
:ret
);
227 static int enc_write(BIO
*b
, const char *in
, int inl
)
232 ctx
=(BIO_ENC_CTX
*)b
->ptr
;
235 BIO_clear_retry_flags(b
);
236 n
=ctx
->buf_len
-ctx
->buf_off
;
239 i
=BIO_write(b
->next_bio
,&(ctx
->buf
[ctx
->buf_off
]),n
);
242 BIO_copy_next_retry(b
);
248 /* at this point all pending data has been written */
250 if ((in
== NULL
) || (inl
<= 0)) return(0);
255 n
=(inl
> ENC_BLOCK_SIZE
)?ENC_BLOCK_SIZE
:inl
;
256 EVP_CipherUpdate(&(ctx
->cipher
),
257 (unsigned char *)ctx
->buf
,&ctx
->buf_len
,
258 (unsigned char *)in
,n
);
266 i
=BIO_write(b
->next_bio
,&(ctx
->buf
[ctx
->buf_off
]),n
);
269 BIO_copy_next_retry(b
);
278 BIO_copy_next_retry(b
);
282 static long enc_ctrl(BIO
*b
, int cmd
, long num
, void *ptr
)
285 BIO_ENC_CTX
*ctx
,*dctx
;
288 EVP_CIPHER_CTX
**c_ctx
;
290 ctx
=(BIO_ENC_CTX
*)b
->ptr
;
297 EVP_CipherInit(&(ctx
->cipher
),NULL
,NULL
,NULL
,
298 ctx
->cipher
.encrypt
);
299 ret
=BIO_ctrl(b
->next_bio
,cmd
,num
,ptr
);
301 case BIO_CTRL_EOF
: /* More to read */
305 ret
=BIO_ctrl(b
->next_bio
,cmd
,num
,ptr
);
307 case BIO_CTRL_WPENDING
:
308 ret
=ctx
->buf_len
-ctx
->buf_off
;
310 ret
=BIO_ctrl(b
->next_bio
,cmd
,num
,ptr
);
312 case BIO_CTRL_PENDING
: /* More to read in buffer */
313 ret
=ctx
->buf_len
-ctx
->buf_off
;
315 ret
=BIO_ctrl(b
->next_bio
,cmd
,num
,ptr
);
318 /* do a final write */
320 while (ctx
->buf_len
!= ctx
->buf_off
)
322 i
=enc_write(b
,NULL
,0);
334 ret
=EVP_CipherFinal(&(ctx
->cipher
),
335 (unsigned char *)ctx
->buf
,
340 /* push out the bytes */
344 /* Finally flush the underlying BIO */
345 ret
=BIO_ctrl(b
->next_bio
,cmd
,num
,ptr
);
347 case BIO_C_GET_CIPHER_STATUS
:
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
);
355 case BIO_C_GET_CIPHER_CTX
:
356 c_ctx
=(EVP_CIPHER_CTX
**)ptr
;
357 (*c_ctx
)= &(ctx
->cipher
);
362 dctx
=(BIO_ENC_CTX
*)dbio
->ptr
;
363 memcpy(&(dctx
->cipher
),&(ctx
->cipher
),sizeof(ctx
->cipher
));
367 ret
=BIO_ctrl(b
->next_bio
,cmd
,num
,ptr
);
373 static long enc_callback_ctrl(BIO
*b
, int cmd
, bio_info_cb
*fp
)
377 if (b
->next_bio
== NULL
) return(0);
381 ret
=BIO_callback_ctrl(b
->next_bio
,cmd
,fp
);
388 void BIO_set_cipher_ctx(b,c)
392 if (b == NULL) return;
394 if ((b->callback != NULL) &&
395 (b->callback(b,BIO_CB_CTRL,(char *)c,BIO_CTRL_SET,e,0L) <= 0))
399 ctx=(BIO_ENC_CTX *)b->ptr;
400 memcpy(ctx->cipher,c,sizeof(EVP_CIPHER_CTX));
402 if (b->callback != NULL)
403 b->callback(b,BIO_CB_CTRL,(char *)c,BIO_CTRL_SET,e,1L);
407 void BIO_set_cipher(BIO
*b
, const EVP_CIPHER
*c
, unsigned char *k
,
408 unsigned char *i
, int e
)
412 if (b
== NULL
) return;
414 if ((b
->callback
!= NULL
) &&
415 (b
->callback(b
,BIO_CB_CTRL
,(const char *)c
,BIO_CTRL_SET
,e
,0L) <= 0))
419 ctx
=(BIO_ENC_CTX
*)b
->ptr
;
420 EVP_CipherInit(&(ctx
->cipher
),c
,k
,i
,e
);
422 if (b
->callback
!= NULL
)
423 b
->callback(b
,BIO_CB_CTRL
,(const char *)c
,BIO_CTRL_SET
,e
,1L);