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git.ipfire.org Git - thirdparty/openssl.git/blob - crypto/pkcs7/bio_ber.c
1 /* crypto/evp/bio_ber.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.]
66 static int ber_write(BIO
*h
,char *buf
,int num
);
67 static int ber_read(BIO
*h
,char *buf
,int size
);
68 /*static int ber_puts(BIO *h,char *str); */
69 /*static int ber_gets(BIO *h,char *str,int size); */
70 static long ber_ctrl(BIO
*h
,int cmd
,long arg1
,char *arg2
);
71 static int ber_new(BIO
*h
);
72 static int ber_free(BIO
*data
);
74 static int ber_write();
75 static int ber_read();
76 /*static int ber_puts(); */
77 /*static int ber_gets(); */
78 static long ber_ctrl();
80 static int ber_free();
83 #define BER_BUF_SIZE (32)
85 /* This is used to hold the state of the BER objects being read. */
86 typedef struct ber_struct
96 typedef struct bio_ber_struct
103 /* most of the following are used when doing non-blocking IO */
105 long num_left
; /* number of bytes still to read/write in block */
106 int depth
; /* used with idefinite encoding. */
107 int finished
; /* No more read data */
116 unsigned char buf
[BER_BUF_SIZE
];
119 static BIO_METHOD methods_ber
=
121 BIO_TYPE_CIPHER
,"cipher",
124 NULL
, /* ber_puts, */
125 NULL
, /* ber_gets, */
131 BIO_METHOD
*BIO_f_ber(void)
133 return(&methods_ber
);
136 static int ber_new(BIO
*bi
)
140 ctx
=(BIO_BER_CTX
*)Malloc(sizeof(BIO_BER_CTX
));
141 if (ctx
== NULL
) return(0);
143 memset((char *)ctx
,0,sizeof(BIO_BER_CTX
));
151 static int ber_free(BIO
*a
)
155 if (a
== NULL
) return(0);
156 b
=(BIO_BER_CTX
*)a
->ptr
;
157 memset(a
->ptr
,0,sizeof(BIO_BER_CTX
));
165 int bio_ber_get_header(BIO
*bio
, BIO_BER_CTX
*ctx
)
176 BIO_clear_retry_flags(b
);
178 /* Pack the buffer down if there is a hole at the front */
179 if (ctx
->buf_off
!= 0)
193 /* If there is more room, read some more data */
194 i
=BER_BUF_SIZE
-ctx
->buf_len
;
197 i
=BIO_read(bio
->next_bio
,&(ctx
->buf
[ctx
->buf_len
]),i
);
200 BIO_copy_next_retry(b
);
209 ret
=ASN1_get_object(&p
,&length
,&tag
,&class,max
);
213 if ((ctx
->buf_len
< BER_BUF_SIZE
) &&
214 (ERR_GET_REASON(ERR_peek_error()) == ASN1_R_TOO_LONG
))
216 ERR_get_error(); /* clear the error */
217 BIO_set_retry_read(b
);
222 /* We have no error, we have a header, so make use of it */
224 if ((ctx
->tag
>= 0) && (ctx
->tag
!= tag
))
226 BIOerr(BIO_F_BIO_BER_GET_HEADER
,BIO_R_TAG_MISMATCH
);
227 sprintf(buf
,"tag=%d, got %d",ctx
->tag
,tag
);
228 ERR_add_error_data(1,buf
);
232 if (ret
& V_ASN1_CONSTRUCTED
)
235 static int ber_read(BIO
*b
, char *out
, int outl
)
240 BIO_clear_retry_flags(b
);
242 if (out
== NULL
) return(0);
243 ctx
=(BIO_BER_CTX
*)b
->ptr
;
245 if ((ctx
== NULL
) || (b
->next_bio
== NULL
)) return(0);
247 if (ctx
->finished
) return(0);
250 /* First see if we are half way through reading a block */
251 if (ctx
->num_left
> 0)
253 if (ctx
->num_left
< outl
)
257 i
=BIO_read(b
->next_bio
,out
,n
);
260 BIO_copy_next_retry(b
);
266 if (ctx
->num_left
<= 0)
277 else /* we need to read another BER header */
282 static int ber_write(BIO
*b
, char *in
, int inl
)
287 ctx
=(BIO_ENC_CTX
*)b
->ptr
;
290 BIO_clear_retry_flags(b
);
291 n
=ctx
->buf_len
-ctx
->buf_off
;
294 i
=BIO_write(b
->next_bio
,&(ctx
->buf
[ctx
->buf_off
]),n
);
297 BIO_copy_next_retry(b
);
303 /* at this point all pending data has been written */
305 if ((in
== NULL
) || (inl
<= 0)) return(0);
310 n
=(inl
> ENC_BLOCK_SIZE
)?ENC_BLOCK_SIZE
:inl
;
311 EVP_CipherUpdate(&(ctx
->cipher
),
312 (unsigned char *)ctx
->buf
,&ctx
->buf_len
,
313 (unsigned char *)in
,n
);
321 i
=BIO_write(b
->next_bio
,&(ctx
->buf
[ctx
->buf_off
]),n
);
324 BIO_copy_next_retry(b
);
333 BIO_copy_next_retry(b
);
337 static long ber_ctrl(BIO
*b
, int cmd
, long num
, char *ptr
)
340 BIO_ENC_CTX
*ctx
,*dctx
;
344 ctx
=(BIO_ENC_CTX
*)b
->ptr
;
351 EVP_CipherInit(&(ctx
->cipher
),NULL
,NULL
,NULL
,
352 ctx
->cipher
.berrypt
);
353 ret
=BIO_ctrl(b
->next_bio
,cmd
,num
,ptr
);
355 case BIO_CTRL_EOF
: /* More to read */
359 ret
=BIO_ctrl(b
->next_bio
,cmd
,num
,ptr
);
361 case BIO_CTRL_WPENDING
:
362 ret
=ctx
->buf_len
-ctx
->buf_off
;
364 ret
=BIO_ctrl(b
->next_bio
,cmd
,num
,ptr
);
366 case BIO_CTRL_PENDING
: /* More to read in buffer */
367 ret
=ctx
->buf_len
-ctx
->buf_off
;
369 ret
=BIO_ctrl(b
->next_bio
,cmd
,num
,ptr
);
372 /* do a final write */
374 while (ctx
->buf_len
!= ctx
->buf_off
)
376 i
=ber_write(b
,NULL
,0);
388 ret
=EVP_CipherFinal(&(ctx
->cipher
),
389 (unsigned char *)ctx
->buf
,
394 /* push out the bytes */
398 /* Finally flush the underlying BIO */
399 ret
=BIO_ctrl(b
->next_bio
,cmd
,num
,ptr
);
401 case BIO_C_GET_CIPHER_STATUS
:
404 case BIO_C_DO_STATE_MACHINE
:
405 BIO_clear_retry_flags(b
);
406 ret
=BIO_ctrl(b
->next_bio
,cmd
,num
,ptr
);
407 BIO_copy_next_retry(b
);
412 dctx
=(BIO_ENC_CTX
*)dbio
->ptr
;
413 memcpy(&(dctx
->cipher
),&(ctx
->cipher
),sizeof(ctx
->cipher
));
417 ret
=BIO_ctrl(b
->next_bio
,cmd
,num
,ptr
);
424 void BIO_set_cipher_ctx(b,c)
428 if (b == NULL) return;
430 if ((b->callback != NULL) &&
431 (b->callback(b,BIO_CB_CTRL,(char *)c,BIO_CTRL_SET,e,0L) <= 0))
435 ctx=(BIO_ENC_CTX *)b->ptr;
436 memcpy(ctx->cipher,c,sizeof(EVP_CIPHER_CTX));
438 if (b->callback != NULL)
439 b->callback(b,BIO_CB_CTRL,(char *)c,BIO_CTRL_SET,e,1L);
443 void BIO_set_cipher(BIO
*b
, EVP_CIPHER
*c
, unsigned char *k
, unsigned char *i
,
448 if (b
== NULL
) return;
450 if ((b
->callback
!= NULL
) &&
451 (b
->callback(b
,BIO_CB_CTRL
,(char *)c
,BIO_CTRL_SET
,e
,0L) <= 0))
455 ctx
=(BIO_ENC_CTX
*)b
->ptr
;
456 EVP_CipherInit(&(ctx
->cipher
),c
,k
,i
,e
);
458 if (b
->callback
!= NULL
)
459 b
->callback(b
,BIO_CB_CTRL
,(char *)c
,BIO_CTRL_SET
,e
,1L);