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>
63 #include "internal/bio.h"
65 static int b64_write(BIO *h, const char *buf, int num);
66 static int b64_read(BIO *h, char *buf, int size);
67 static int b64_puts(BIO *h, const char *str);
69 * static int b64_gets(BIO *h, char *str, int size);
71 static long b64_ctrl(BIO *h, int cmd, long arg1, void *arg2);
72 static int b64_new(BIO *h);
73 static int b64_free(BIO *data);
74 static long b64_callback_ctrl(BIO *h, int cmd, bio_info_cb *fp);
75 #define B64_BLOCK_SIZE 1024
76 #define B64_BLOCK_SIZE2 768
81 typedef struct b64_struct {
83 * BIO *bio; moved to the BIO structure
87 int tmp_len; /* used to find the start when decoding */
88 int tmp_nl; /* If true, scan until '\n' */
90 int start; /* have we started decoding yet? */
91 int cont; /* <= 0 when finished */
92 EVP_ENCODE_CTX *base64;
93 char buf[EVP_ENCODE_LENGTH(B64_BLOCK_SIZE) + 10];
94 char tmp[B64_BLOCK_SIZE];
97 static const BIO_METHOD methods_b64 = {
98 BIO_TYPE_BASE64, "base64 encoding",
102 NULL, /* b64_gets, */
110 const BIO_METHOD *BIO_f_base64(void)
115 static int b64_new(BIO *bi)
119 ctx = OPENSSL_zalloc(sizeof(*ctx));
125 ctx->base64 = EVP_ENCODE_CTX_new();
126 BIO_set_data(bi, ctx);
132 static int b64_free(BIO *a)
138 ctx = BIO_get_data(a);
142 EVP_ENCODE_CTX_free(ctx->base64);
144 BIO_set_data(a, NULL);
150 static int b64_read(BIO *b, char *out, int outl)
152 int ret = 0, i, ii, j, k, x, n, num, ret_code = 0;
154 unsigned char *p, *q;
159 ctx = (BIO_B64_CTX *)BIO_get_data(b);
162 if ((ctx == NULL) || (next == NULL))
165 BIO_clear_retry_flags(b);
167 if (ctx->encode != B64_DECODE) {
168 ctx->encode = B64_DECODE;
172 EVP_DecodeInit(ctx->base64);
175 /* First check if there are bytes decoded/encoded */
176 if (ctx->buf_len > 0) {
177 OPENSSL_assert(ctx->buf_len >= ctx->buf_off);
178 i = ctx->buf_len - ctx->buf_off;
181 OPENSSL_assert(ctx->buf_off + i < (int)sizeof(ctx->buf));
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 buffer, so we
195 * should read in some more.
203 i = BIO_read(next, &(ctx->tmp[ctx->tmp_len]),
204 B64_BLOCK_SIZE - ctx->tmp_len);
209 /* Should we continue next time we are called? */
210 if (!BIO_should_retry(next)) {
212 /* If buffer empty break */
213 if (ctx->tmp_len == 0)
215 /* Fall through and process what we have */
219 /* else we retry and add more data to buffer */
227 * We need to scan, a line at a time until we have a valid line if we
230 if (ctx->start && (BIO_get_flags(b) & BIO_FLAGS_BASE64_NO_NL)) {
233 } else if (ctx->start) {
234 q = p = (unsigned char *)ctx->tmp;
236 for (j = 0; j < i; j++) {
241 * due to a previous very long line, we need to keep on
242 * scanning for a '\n' before we even start looking for
243 * base64 encoded stuff.
251 k = EVP_DecodeUpdate(ctx->base64,
252 (unsigned char *)ctx->buf,
254 if ((k <= 0) && (num == 0) && (ctx->start))
255 EVP_DecodeInit(ctx->base64);
257 if (p != (unsigned char *)
259 i -= (p - (unsigned char *)
261 for (x = 0; x < i; x++)
264 EVP_DecodeInit(ctx->base64);
271 /* we fell off the end without starting */
272 if ((j == i) && (num == 0)) {
274 * Is this is one long chunk?, if so, keep on reading until a
277 if (p == (unsigned char *)&(ctx->tmp[0])) {
278 /* Check buffer full */
279 if (i == B64_BLOCK_SIZE) {
283 } else if (p != q) { /* finished on a '\n' */
285 for (ii = 0; ii < n; ii++)
286 ctx->tmp[ii] = p[ii];
289 /* else finished on a '\n' */
294 } else if ((i < B64_BLOCK_SIZE) && (ctx->cont > 0)) {
296 * If buffer isn't full and we can retry then restart to read in
302 if (BIO_get_flags(b) & BIO_FLAGS_BASE64_NO_NL) {
305 jj = i & ~3; /* process per 4 */
306 z = EVP_DecodeBlock((unsigned char *)ctx->buf,
307 (unsigned char *)ctx->tmp, jj);
309 if (ctx->tmp[jj - 1] == '=') {
311 if (ctx->tmp[jj - 2] == '=')
316 * z is now number of output bytes and jj is the number consumed
319 memmove(ctx->tmp, &ctx->tmp[jj], i - jj);
320 ctx->tmp_len = i - jj;
328 i = EVP_DecodeUpdate(ctx->base64,
329 (unsigned char *)ctx->buf, &ctx->buf_len,
330 (unsigned char *)ctx->tmp, i);
340 if (ctx->buf_len <= outl)
345 memcpy(out, ctx->buf, i);
348 if (ctx->buf_off == ctx->buf_len) {
355 /* BIO_clear_retry_flags(b); */
356 BIO_copy_next_retry(b);
357 return ((ret == 0) ? ret_code : ret);
360 static int b64_write(BIO *b, const char *in, int inl)
368 ctx = (BIO_B64_CTX *)BIO_get_data(b);
370 if ((ctx == NULL) || (next == NULL))
373 BIO_clear_retry_flags(b);
375 if (ctx->encode != B64_ENCODE) {
376 ctx->encode = B64_ENCODE;
380 EVP_EncodeInit(ctx->base64);
383 OPENSSL_assert(ctx->buf_off < (int)sizeof(ctx->buf));
384 OPENSSL_assert(ctx->buf_len <= (int)sizeof(ctx->buf));
385 OPENSSL_assert(ctx->buf_len >= ctx->buf_off);
386 n = ctx->buf_len - ctx->buf_off;
388 i = BIO_write(next, &(ctx->buf[ctx->buf_off]), n);
390 BIO_copy_next_retry(b);
393 OPENSSL_assert(i <= n);
395 OPENSSL_assert(ctx->buf_off <= (int)sizeof(ctx->buf));
396 OPENSSL_assert(ctx->buf_len >= ctx->buf_off);
399 /* at this point all pending data has been written */
403 if ((in == NULL) || (inl <= 0))
407 n = (inl > B64_BLOCK_SIZE) ? B64_BLOCK_SIZE : inl;
409 if (BIO_get_flags(b) & BIO_FLAGS_BASE64_NO_NL) {
410 if (ctx->tmp_len > 0) {
411 OPENSSL_assert(ctx->tmp_len <= 3);
412 n = 3 - ctx->tmp_len;
414 * There's a theoretical possibility for this
418 memcpy(&(ctx->tmp[ctx->tmp_len]), in, n);
421 if (ctx->tmp_len < 3)
424 EVP_EncodeBlock((unsigned char *)ctx->buf,
425 (unsigned char *)ctx->tmp, ctx->tmp_len);
426 OPENSSL_assert(ctx->buf_len <= (int)sizeof(ctx->buf));
427 OPENSSL_assert(ctx->buf_len >= ctx->buf_off);
429 * Since we're now done using the temporary buffer, the
430 * length should be 0'd
435 memcpy(ctx->tmp, in, n);
442 EVP_EncodeBlock((unsigned char *)ctx->buf,
443 (const unsigned char *)in, n);
444 OPENSSL_assert(ctx->buf_len <= (int)sizeof(ctx->buf));
445 OPENSSL_assert(ctx->buf_len >= ctx->buf_off);
449 EVP_EncodeUpdate(ctx->base64,
450 (unsigned char *)ctx->buf, &ctx->buf_len,
451 (unsigned char *)in, n);
452 OPENSSL_assert(ctx->buf_len <= (int)sizeof(ctx->buf));
453 OPENSSL_assert(ctx->buf_len >= ctx->buf_off);
462 i = BIO_write(next, &(ctx->buf[ctx->buf_off]), n);
464 BIO_copy_next_retry(b);
465 return ((ret == 0) ? i : ret);
467 OPENSSL_assert(i <= n);
470 OPENSSL_assert(ctx->buf_off <= (int)sizeof(ctx->buf));
471 OPENSSL_assert(ctx->buf_len >= ctx->buf_off);
479 static long b64_ctrl(BIO *b, int cmd, long num, void *ptr)
486 ctx = (BIO_B64_CTX *)BIO_get_data(b);
488 if ((ctx == NULL) || (next == NULL))
495 ctx->encode = B64_NONE;
496 ret = BIO_ctrl(next, cmd, num, ptr);
498 case BIO_CTRL_EOF: /* More to read */
502 ret = BIO_ctrl(next, cmd, num, ptr);
504 case BIO_CTRL_WPENDING: /* More to write in buffer */
505 OPENSSL_assert(ctx->buf_len >= ctx->buf_off);
506 ret = ctx->buf_len - ctx->buf_off;
507 if ((ret == 0) && (ctx->encode != B64_NONE)
508 && (EVP_ENCODE_CTX_num(ctx->base64) != 0))
511 ret = BIO_ctrl(next, cmd, num, ptr);
513 case BIO_CTRL_PENDING: /* More to read in buffer */
514 OPENSSL_assert(ctx->buf_len >= ctx->buf_off);
515 ret = ctx->buf_len - ctx->buf_off;
517 ret = BIO_ctrl(next, cmd, num, ptr);
520 /* do a final write */
522 while (ctx->buf_len != ctx->buf_off) {
523 i = b64_write(b, NULL, 0);
527 if (BIO_get_flags(b) & BIO_FLAGS_BASE64_NO_NL) {
528 if (ctx->tmp_len != 0) {
529 ctx->buf_len = EVP_EncodeBlock((unsigned char *)ctx->buf,
530 (unsigned char *)ctx->tmp,
536 } else if (ctx->encode != B64_NONE
537 && EVP_ENCODE_CTX_num(ctx->base64) != 0) {
539 EVP_EncodeFinal(ctx->base64,
540 (unsigned char *)ctx->buf, &(ctx->buf_len));
541 /* push out the bytes */
544 /* Finally flush the underlying BIO */
545 ret = BIO_ctrl(next, cmd, num, ptr);
548 case BIO_C_DO_STATE_MACHINE:
549 BIO_clear_retry_flags(b);
550 ret = BIO_ctrl(next, cmd, num, ptr);
551 BIO_copy_next_retry(b);
560 ret = BIO_ctrl(next, cmd, num, ptr);
566 static long b64_callback_ctrl(BIO *b, int cmd, bio_info_cb *fp)
569 BIO *next = BIO_next(b);
575 ret = BIO_callback_ctrl(next, cmd, fp);
581 static int b64_puts(BIO *b, const char *str)
583 return b64_write(b, str, strlen(str));