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);