1 /* crypto/evp/bio_b64.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 b64_write(BIO *h,char *buf,int num);
67 static int b64_read(BIO *h,char *buf,int size);
68 /*static int b64_puts(BIO *h,char *str); */
69 /*static int b64_gets(BIO *h,char *str,int size); */
70 static long b64_ctrl(BIO *h,int cmd,long arg1,char *arg2);
71 static int b64_new(BIO *h);
72 static int b64_free(BIO *data);
74 static int b64_write();
75 static int b64_read();
76 /*static int b64_puts(); */
77 /*static int b64_gets(); */
78 static long b64_ctrl();
80 static int b64_free();
83 #define B64_BLOCK_SIZE 1024
84 #define B64_BLOCK_SIZE2 768
89 typedef struct b64_struct
91 /*BIO *bio; moved to the BIO structure */
94 int tmp_len; /* used to find the start when decoding */
95 int tmp_nl; /* If true, scan until '\n' */
97 int start; /* have we started decoding yet? */
98 int cont; /* <= 0 when finished */
99 EVP_ENCODE_CTX base64;
100 char buf[EVP_ENCODE_LENGTH(B64_BLOCK_SIZE)+10];
101 char tmp[B64_BLOCK_SIZE];
104 static BIO_METHOD methods_b64=
106 BIO_TYPE_BASE64,"base64 encoding",
109 NULL, /* b64_puts, */
110 NULL, /* b64_gets, */
116 BIO_METHOD *BIO_f_base64()
118 return(&methods_b64);
121 static int b64_new(bi)
126 ctx=(BIO_B64_CTX *)Malloc(sizeof(BIO_B64_CTX));
127 if (ctx == NULL) return(0);
143 static int b64_free(a)
146 if (a == NULL) return(0);
154 static int b64_read(b,out,outl)
159 int ret=0,i,ii,j,k,x,n,num,ret_code=0;
163 if (out == NULL) return(0);
164 ctx=(BIO_B64_CTX *)b->ptr;
166 if ((ctx == NULL) || (b->next_bio == NULL)) return(0);
168 if (ctx->encode != B64_DECODE)
170 ctx->encode=B64_DECODE;
174 EVP_DecodeInit(&(ctx->base64));
177 /* First check if there are bytes decoded/encoded */
178 if (ctx->buf_len > 0)
180 i=ctx->buf_len-ctx->buf_off;
181 if (i > outl) i=outl;
182 memcpy(out,&(ctx->buf[ctx->buf_off]),i);
187 if (ctx->buf_len == ctx->buf_off)
194 /* At this point, we have room of outl bytes and an empty
195 * buffer, so we should read in some more. */
200 if (ctx->cont <= 0) break;
202 i=BIO_read(b->next_bio,&(ctx->tmp[ctx->tmp_len]),
203 B64_BLOCK_SIZE-ctx->tmp_len);
209 /* Should be continue next time we are called? */
210 if (!BIO_should_retry(b->next_bio))
212 /* else we should continue when called again */
217 /* We need to scan, a line at a time until we
218 * have a valid line if we are starting. */
219 if (ctx->start && (BIO_get_flags(b) & BIO_FLAGS_BASE64_NO_NL))
226 q=p=(unsigned char *)ctx->tmp;
229 if (*(q++) != '\n') continue;
231 /* due to a previous very long line,
232 * we need to keep on scanning for a '\n'
233 * before we even start looking for
234 * base64 encoded stuff. */
242 k=EVP_DecodeUpdate(&(ctx->base64),
243 (unsigned char *)ctx->buf,
245 if ((k <= 0) && (num == 0) && (ctx->start))
246 EVP_DecodeInit(&ctx->base64);
249 if (p != (unsigned char *)
252 i-=(p- (unsigned char *)
254 for (x=0; x < i; x++)
256 EVP_DecodeInit(&ctx->base64);
264 /* we fell off the end without starting */
267 /* Is this is one long chunk?, if so, keep on
268 * reading until a new line. */
269 if (p == (unsigned char *)&(ctx->tmp[0]))
274 else if (p != q) /* finished on a '\n' */
277 for (ii=0; ii<n; ii++)
281 /* else finished on a '\n' */
288 if (BIO_get_flags(b) & BIO_FLAGS_BASE64_NO_NL)
293 z=EVP_DecodeBlock((unsigned char *)ctx->buf,
294 (unsigned char *)ctx->tmp,jj);
297 if (ctx->tmp[jj-1] == '=')
300 if (ctx->tmp[jj-2] == '=')
304 /* z is now number of output bytes and jj is the
308 memcpy((unsigned char *)ctx->tmp,
309 (unsigned char *)&(ctx->tmp[jj]),i-jj);
323 i=EVP_DecodeUpdate(&(ctx->base64),
324 (unsigned char *)ctx->buf,&ctx->buf_len,
325 (unsigned char *)ctx->tmp,i);
336 if (ctx->buf_len <= outl)
341 memcpy(out,ctx->buf,i);
344 if (ctx->buf_off == ctx->buf_len)
352 BIO_clear_retry_flags(b);
353 BIO_copy_next_retry(b);
354 return((ret == 0)?ret_code:ret);
357 static int b64_write(b,in,inl)
365 ctx=(BIO_B64_CTX *)b->ptr;
366 BIO_clear_retry_flags(b);
368 if (ctx->encode != B64_ENCODE)
370 ctx->encode=B64_ENCODE;
374 EVP_EncodeInit(&(ctx->base64));
377 n=ctx->buf_len-ctx->buf_off;
380 i=BIO_write(b->next_bio,&(ctx->buf[ctx->buf_off]),n);
383 BIO_copy_next_retry(b);
389 /* at this point all pending data has been written */
391 if ((in == NULL) || (inl <= 0)) return(0);
396 n=(inl > B64_BLOCK_SIZE)?B64_BLOCK_SIZE:inl;
398 if (BIO_get_flags(b) & BIO_FLAGS_BASE64_NO_NL)
400 if (ctx->tmp_len > 0)
403 memcpy(&(ctx->tmp[ctx->tmp_len]),in,n);
408 ctx->buf_len=EVP_EncodeBlock(
409 (unsigned char *)ctx->buf,
410 (unsigned char *)ctx->tmp,n);
416 memcpy(&(ctx->tmp[0]),in,n);
421 ctx->buf_len=EVP_EncodeBlock(
422 (unsigned char *)ctx->buf,
423 (unsigned char *)in,n);
428 EVP_EncodeUpdate(&(ctx->base64),
429 (unsigned char *)ctx->buf,&ctx->buf_len,
430 (unsigned char *)in,n);
439 i=BIO_write(b->next_bio,&(ctx->buf[ctx->buf_off]),n);
442 BIO_copy_next_retry(b);
443 return((ret == 0)?i:ret);
454 static long b64_ctrl(b,cmd,num,ptr)
464 ctx=(BIO_B64_CTX *)b->ptr;
471 ctx->encode=B64_NONE;
472 ret=BIO_ctrl(b->next_bio,cmd,num,ptr);
474 case BIO_CTRL_EOF: /* More to read */
478 ret=BIO_ctrl(b->next_bio,cmd,num,ptr);
480 case BIO_CTRL_WPENDING: /* More to write in buffer */
481 ret=ctx->buf_len-ctx->buf_off;
482 if ((ret == 0) && (ctx->base64.num != 0))
485 ret=BIO_ctrl(b->next_bio,cmd,num,ptr);
487 case BIO_CTRL_PENDING: /* More to read in buffer */
488 ret=ctx->buf_len-ctx->buf_off;
490 ret=BIO_ctrl(b->next_bio,cmd,num,ptr);
493 /* do a final write */
495 while (ctx->buf_len != ctx->buf_off)
497 i=b64_write(b,NULL,0);
504 if (BIO_get_flags(b) & BIO_FLAGS_BASE64_NO_NL)
506 if (ctx->tmp_len != 0)
508 ctx->buf_len=EVP_EncodeBlock(
509 (unsigned char *)ctx->buf,
510 (unsigned char *)ctx->tmp,
517 else if (ctx->base64.num != 0)
520 EVP_EncodeFinal(&(ctx->base64),
521 (unsigned char *)ctx->buf,
523 /* push out the bytes */
526 /* Finally flush the underlying BIO */
527 ret=BIO_ctrl(b->next_bio,cmd,num,ptr);
530 case BIO_C_DO_STATE_MACHINE:
531 BIO_clear_retry_flags(b);
532 ret=BIO_ctrl(b->next_bio,cmd,num,ptr);
533 BIO_copy_next_retry(b);
542 ret=BIO_ctrl(b->next_bio,cmd,num,ptr);