1*de0e0e4dSAntonio Huete Jimenez /* $OpenBSD: bio_b64.c,v 1.25 2022/01/14 08:40:57 tb Exp $ */
2f5b1c8a1SJohn Marino /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
3f5b1c8a1SJohn Marino * All rights reserved.
4f5b1c8a1SJohn Marino *
5f5b1c8a1SJohn Marino * This package is an SSL implementation written
6f5b1c8a1SJohn Marino * by Eric Young (eay@cryptsoft.com).
7f5b1c8a1SJohn Marino * The implementation was written so as to conform with Netscapes SSL.
8f5b1c8a1SJohn Marino *
9f5b1c8a1SJohn Marino * This library is free for commercial and non-commercial use as long as
10f5b1c8a1SJohn Marino * the following conditions are aheared to. The following conditions
11f5b1c8a1SJohn Marino * apply to all code found in this distribution, be it the RC4, RSA,
12f5b1c8a1SJohn Marino * lhash, DES, etc., code; not just the SSL code. The SSL documentation
13f5b1c8a1SJohn Marino * included with this distribution is covered by the same copyright terms
14f5b1c8a1SJohn Marino * except that the holder is Tim Hudson (tjh@cryptsoft.com).
15f5b1c8a1SJohn Marino *
16f5b1c8a1SJohn Marino * Copyright remains Eric Young's, and as such any Copyright notices in
17f5b1c8a1SJohn Marino * the code are not to be removed.
18f5b1c8a1SJohn Marino * If this package is used in a product, Eric Young should be given attribution
19f5b1c8a1SJohn Marino * as the author of the parts of the library used.
20f5b1c8a1SJohn Marino * This can be in the form of a textual message at program startup or
21f5b1c8a1SJohn Marino * in documentation (online or textual) provided with the package.
22f5b1c8a1SJohn Marino *
23f5b1c8a1SJohn Marino * Redistribution and use in source and binary forms, with or without
24f5b1c8a1SJohn Marino * modification, are permitted provided that the following conditions
25f5b1c8a1SJohn Marino * are met:
26f5b1c8a1SJohn Marino * 1. Redistributions of source code must retain the copyright
27f5b1c8a1SJohn Marino * notice, this list of conditions and the following disclaimer.
28f5b1c8a1SJohn Marino * 2. Redistributions in binary form must reproduce the above copyright
29f5b1c8a1SJohn Marino * notice, this list of conditions and the following disclaimer in the
30f5b1c8a1SJohn Marino * documentation and/or other materials provided with the distribution.
31f5b1c8a1SJohn Marino * 3. All advertising materials mentioning features or use of this software
32f5b1c8a1SJohn Marino * must display the following acknowledgement:
33f5b1c8a1SJohn Marino * "This product includes cryptographic software written by
34f5b1c8a1SJohn Marino * Eric Young (eay@cryptsoft.com)"
35f5b1c8a1SJohn Marino * The word 'cryptographic' can be left out if the rouines from the library
36f5b1c8a1SJohn Marino * being used are not cryptographic related :-).
37f5b1c8a1SJohn Marino * 4. If you include any Windows specific code (or a derivative thereof) from
38f5b1c8a1SJohn Marino * the apps directory (application code) you must include an acknowledgement:
39f5b1c8a1SJohn Marino * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
40f5b1c8a1SJohn Marino *
41f5b1c8a1SJohn Marino * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
42f5b1c8a1SJohn Marino * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
43f5b1c8a1SJohn Marino * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
44f5b1c8a1SJohn Marino * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
45f5b1c8a1SJohn Marino * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
46f5b1c8a1SJohn Marino * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
47f5b1c8a1SJohn Marino * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
48f5b1c8a1SJohn Marino * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
49f5b1c8a1SJohn Marino * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
50f5b1c8a1SJohn Marino * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
51f5b1c8a1SJohn Marino * SUCH DAMAGE.
52f5b1c8a1SJohn Marino *
53f5b1c8a1SJohn Marino * The licence and distribution terms for any publically available version or
54f5b1c8a1SJohn Marino * derivative of this code cannot be changed. i.e. this code cannot simply be
55f5b1c8a1SJohn Marino * copied and put under another distribution licence
56f5b1c8a1SJohn Marino * [including the GNU Public Licence.]
57f5b1c8a1SJohn Marino */
58f5b1c8a1SJohn Marino
59f5b1c8a1SJohn Marino #include <errno.h>
60f5b1c8a1SJohn Marino #include <stdio.h>
61f5b1c8a1SJohn Marino #include <string.h>
62f5b1c8a1SJohn Marino
63f5b1c8a1SJohn Marino #include <openssl/buffer.h>
64f5b1c8a1SJohn Marino #include <openssl/evp.h>
65f5b1c8a1SJohn Marino
66*de0e0e4dSAntonio Huete Jimenez #include "bio_local.h"
67*de0e0e4dSAntonio Huete Jimenez #include "evp_locl.h"
68*de0e0e4dSAntonio Huete Jimenez
69f5b1c8a1SJohn Marino static int b64_write(BIO *h, const char *buf, int num);
70f5b1c8a1SJohn Marino static int b64_read(BIO *h, char *buf, int size);
71f5b1c8a1SJohn Marino static int b64_puts(BIO *h, const char *str);
72f5b1c8a1SJohn Marino /*static int b64_gets(BIO *h, char *str, int size); */
73f5b1c8a1SJohn Marino static long b64_ctrl(BIO *h, int cmd, long arg1, void *arg2);
74f5b1c8a1SJohn Marino static int b64_new(BIO *h);
75f5b1c8a1SJohn Marino static int b64_free(BIO *data);
76*de0e0e4dSAntonio Huete Jimenez static long b64_callback_ctrl(BIO *h, int cmd, BIO_info_cb *fp);
77f5b1c8a1SJohn Marino #define B64_BLOCK_SIZE 1024
78f5b1c8a1SJohn Marino #define B64_BLOCK_SIZE2 768
79f5b1c8a1SJohn Marino #define B64_NONE 0
80f5b1c8a1SJohn Marino #define B64_ENCODE 1
81f5b1c8a1SJohn Marino #define B64_DECODE 2
82f5b1c8a1SJohn Marino
83f5b1c8a1SJohn Marino typedef struct b64_struct {
84f5b1c8a1SJohn Marino /*BIO *bio; moved to the BIO structure */
85f5b1c8a1SJohn Marino int buf_len;
86f5b1c8a1SJohn Marino int buf_off;
87f5b1c8a1SJohn Marino int tmp_len; /* used to find the start when decoding */
88f5b1c8a1SJohn Marino int tmp_nl; /* If true, scan until '\n' */
89f5b1c8a1SJohn Marino int encode;
90f5b1c8a1SJohn Marino int start; /* have we started decoding yet? */
91f5b1c8a1SJohn Marino int cont; /* <= 0 when finished */
92f5b1c8a1SJohn Marino EVP_ENCODE_CTX base64;
93f5b1c8a1SJohn Marino char buf[EVP_ENCODE_LENGTH(B64_BLOCK_SIZE) + 10];
94f5b1c8a1SJohn Marino char tmp[B64_BLOCK_SIZE];
95f5b1c8a1SJohn Marino } BIO_B64_CTX;
96f5b1c8a1SJohn Marino
9772c33676SMaxim Ag static const BIO_METHOD methods_b64 = {
98f5b1c8a1SJohn Marino .type = BIO_TYPE_BASE64,
99f5b1c8a1SJohn Marino .name = "base64 encoding",
100f5b1c8a1SJohn Marino .bwrite = b64_write,
101f5b1c8a1SJohn Marino .bread = b64_read,
102f5b1c8a1SJohn Marino .bputs = b64_puts,
103f5b1c8a1SJohn Marino .ctrl = b64_ctrl,
104f5b1c8a1SJohn Marino .create = b64_new,
105f5b1c8a1SJohn Marino .destroy = b64_free,
106f5b1c8a1SJohn Marino .callback_ctrl = b64_callback_ctrl
107f5b1c8a1SJohn Marino };
108f5b1c8a1SJohn Marino
10972c33676SMaxim Ag const BIO_METHOD *
BIO_f_base64(void)110f5b1c8a1SJohn Marino BIO_f_base64(void)
111f5b1c8a1SJohn Marino {
112f5b1c8a1SJohn Marino return (&methods_b64);
113f5b1c8a1SJohn Marino }
114f5b1c8a1SJohn Marino
115f5b1c8a1SJohn Marino static int
b64_new(BIO * bi)116f5b1c8a1SJohn Marino b64_new(BIO *bi)
117f5b1c8a1SJohn Marino {
118f5b1c8a1SJohn Marino BIO_B64_CTX *ctx;
119f5b1c8a1SJohn Marino
120f5b1c8a1SJohn Marino ctx = malloc(sizeof(BIO_B64_CTX));
121f5b1c8a1SJohn Marino if (ctx == NULL)
122f5b1c8a1SJohn Marino return (0);
123f5b1c8a1SJohn Marino
124f5b1c8a1SJohn Marino ctx->buf_len = 0;
125f5b1c8a1SJohn Marino ctx->tmp_len = 0;
126f5b1c8a1SJohn Marino ctx->tmp_nl = 0;
127f5b1c8a1SJohn Marino ctx->buf_off = 0;
128f5b1c8a1SJohn Marino ctx->cont = 1;
129f5b1c8a1SJohn Marino ctx->start = 1;
130f5b1c8a1SJohn Marino ctx->encode = 0;
131f5b1c8a1SJohn Marino
132f5b1c8a1SJohn Marino bi->init = 1;
133f5b1c8a1SJohn Marino bi->ptr = (char *)ctx;
134f5b1c8a1SJohn Marino bi->flags = 0;
135f5b1c8a1SJohn Marino bi->num = 0;
136f5b1c8a1SJohn Marino return (1);
137f5b1c8a1SJohn Marino }
138f5b1c8a1SJohn Marino
139f5b1c8a1SJohn Marino static int
b64_free(BIO * a)140f5b1c8a1SJohn Marino b64_free(BIO *a)
141f5b1c8a1SJohn Marino {
142f5b1c8a1SJohn Marino if (a == NULL)
143f5b1c8a1SJohn Marino return (0);
144f5b1c8a1SJohn Marino free(a->ptr);
145f5b1c8a1SJohn Marino a->ptr = NULL;
146f5b1c8a1SJohn Marino a->init = 0;
147f5b1c8a1SJohn Marino a->flags = 0;
148f5b1c8a1SJohn Marino return (1);
149f5b1c8a1SJohn Marino }
150f5b1c8a1SJohn Marino
151f5b1c8a1SJohn Marino static int
b64_read(BIO * b,char * out,int outl)152f5b1c8a1SJohn Marino b64_read(BIO *b, char *out, int outl)
153f5b1c8a1SJohn Marino {
154f5b1c8a1SJohn Marino int ret = 0, i, ii, j, k, x, n, num, ret_code = 0;
155f5b1c8a1SJohn Marino BIO_B64_CTX *ctx;
156f5b1c8a1SJohn Marino unsigned char *p, *q;
157f5b1c8a1SJohn Marino
158f5b1c8a1SJohn Marino if (out == NULL)
159f5b1c8a1SJohn Marino return (0);
160f5b1c8a1SJohn Marino ctx = (BIO_B64_CTX *)b->ptr;
161f5b1c8a1SJohn Marino
162f5b1c8a1SJohn Marino if ((ctx == NULL) || (b->next_bio == NULL))
163f5b1c8a1SJohn Marino return (0);
164f5b1c8a1SJohn Marino
165f5b1c8a1SJohn Marino BIO_clear_retry_flags(b);
166f5b1c8a1SJohn Marino
167f5b1c8a1SJohn Marino if (ctx->encode != B64_DECODE) {
168f5b1c8a1SJohn Marino ctx->encode = B64_DECODE;
169f5b1c8a1SJohn Marino ctx->buf_len = 0;
170f5b1c8a1SJohn Marino ctx->buf_off = 0;
171f5b1c8a1SJohn Marino ctx->tmp_len = 0;
172f5b1c8a1SJohn Marino EVP_DecodeInit(&(ctx->base64));
173f5b1c8a1SJohn Marino }
174f5b1c8a1SJohn Marino
175f5b1c8a1SJohn Marino /* First check if there are bytes decoded/encoded */
176f5b1c8a1SJohn Marino if (ctx->buf_len > 0) {
177f5b1c8a1SJohn Marino OPENSSL_assert(ctx->buf_len >= ctx->buf_off);
178f5b1c8a1SJohn Marino i = ctx->buf_len - ctx->buf_off;
179f5b1c8a1SJohn Marino if (i > outl)
180f5b1c8a1SJohn Marino i = outl;
181f5b1c8a1SJohn Marino OPENSSL_assert(ctx->buf_off + i < (int)sizeof(ctx->buf));
182f5b1c8a1SJohn Marino memcpy(out, &(ctx->buf[ctx->buf_off]), i);
183f5b1c8a1SJohn Marino ret = i;
184f5b1c8a1SJohn Marino out += i;
185f5b1c8a1SJohn Marino outl -= i;
186f5b1c8a1SJohn Marino ctx->buf_off += i;
187f5b1c8a1SJohn Marino if (ctx->buf_len == ctx->buf_off) {
188f5b1c8a1SJohn Marino ctx->buf_len = 0;
189f5b1c8a1SJohn Marino ctx->buf_off = 0;
190f5b1c8a1SJohn Marino }
191f5b1c8a1SJohn Marino }
192f5b1c8a1SJohn Marino
193f5b1c8a1SJohn Marino /* At this point, we have room of outl bytes and an empty
194f5b1c8a1SJohn Marino * buffer, so we should read in some more. */
195f5b1c8a1SJohn Marino
196f5b1c8a1SJohn Marino ret_code = 0;
197f5b1c8a1SJohn Marino while (outl > 0) {
198f5b1c8a1SJohn Marino if (ctx->cont <= 0)
199f5b1c8a1SJohn Marino break;
200f5b1c8a1SJohn Marino
201f5b1c8a1SJohn Marino i = BIO_read(b->next_bio, &(ctx->tmp[ctx->tmp_len]),
202f5b1c8a1SJohn Marino B64_BLOCK_SIZE - ctx->tmp_len);
203f5b1c8a1SJohn Marino
204f5b1c8a1SJohn Marino if (i <= 0) {
205f5b1c8a1SJohn Marino ret_code = i;
206f5b1c8a1SJohn Marino
207f5b1c8a1SJohn Marino /* Should we continue next time we are called? */
208f5b1c8a1SJohn Marino if (!BIO_should_retry(b->next_bio)) {
209f5b1c8a1SJohn Marino ctx->cont = i;
210f5b1c8a1SJohn Marino /* If buffer empty break */
211f5b1c8a1SJohn Marino if (ctx->tmp_len == 0)
212f5b1c8a1SJohn Marino break;
213f5b1c8a1SJohn Marino /* Fall through and process what we have */
214f5b1c8a1SJohn Marino else
215f5b1c8a1SJohn Marino i = 0;
216f5b1c8a1SJohn Marino }
217f5b1c8a1SJohn Marino /* else we retry and add more data to buffer */
218f5b1c8a1SJohn Marino else
219f5b1c8a1SJohn Marino break;
220f5b1c8a1SJohn Marino }
221f5b1c8a1SJohn Marino i += ctx->tmp_len;
222f5b1c8a1SJohn Marino ctx->tmp_len = i;
223f5b1c8a1SJohn Marino
224f5b1c8a1SJohn Marino /* We need to scan, a line at a time until we
225f5b1c8a1SJohn Marino * have a valid line if we are starting. */
226f5b1c8a1SJohn Marino if (ctx->start && (BIO_get_flags(b) & BIO_FLAGS_BASE64_NO_NL)) {
227f5b1c8a1SJohn Marino /* ctx->start=1; */
228f5b1c8a1SJohn Marino ctx->tmp_len = 0;
229f5b1c8a1SJohn Marino } else if (ctx->start) {
230f5b1c8a1SJohn Marino q = p =(unsigned char *)ctx->tmp;
231f5b1c8a1SJohn Marino num = 0;
232f5b1c8a1SJohn Marino for (j = 0; j < i; j++) {
233f5b1c8a1SJohn Marino if (*(q++) != '\n')
234f5b1c8a1SJohn Marino continue;
235f5b1c8a1SJohn Marino
236f5b1c8a1SJohn Marino /* due to a previous very long line,
237f5b1c8a1SJohn Marino * we need to keep on scanning for a '\n'
238f5b1c8a1SJohn Marino * before we even start looking for
239f5b1c8a1SJohn Marino * base64 encoded stuff. */
240f5b1c8a1SJohn Marino if (ctx->tmp_nl) {
241f5b1c8a1SJohn Marino p = q;
242f5b1c8a1SJohn Marino ctx->tmp_nl = 0;
243f5b1c8a1SJohn Marino continue;
244f5b1c8a1SJohn Marino }
245f5b1c8a1SJohn Marino
246f5b1c8a1SJohn Marino k = EVP_DecodeUpdate(&(ctx->base64),
247f5b1c8a1SJohn Marino (unsigned char *)ctx->buf,
248f5b1c8a1SJohn Marino &num, p, q - p);
249f5b1c8a1SJohn Marino if ((k <= 0) && (num == 0) && (ctx->start))
250f5b1c8a1SJohn Marino EVP_DecodeInit(&ctx->base64);
251f5b1c8a1SJohn Marino else {
252f5b1c8a1SJohn Marino if (p != (unsigned char *)
253f5b1c8a1SJohn Marino &(ctx->tmp[0])) {
254f5b1c8a1SJohn Marino i -= (p - (unsigned char *)
255f5b1c8a1SJohn Marino &(ctx->tmp[0]));
256f5b1c8a1SJohn Marino for (x = 0; x < i; x++)
257f5b1c8a1SJohn Marino ctx->tmp[x] = p[x];
258f5b1c8a1SJohn Marino }
259f5b1c8a1SJohn Marino EVP_DecodeInit(&ctx->base64);
260f5b1c8a1SJohn Marino ctx->start = 0;
261f5b1c8a1SJohn Marino break;
262f5b1c8a1SJohn Marino }
263f5b1c8a1SJohn Marino p = q;
264f5b1c8a1SJohn Marino }
265f5b1c8a1SJohn Marino
266f5b1c8a1SJohn Marino /* we fell off the end without starting */
267f5b1c8a1SJohn Marino if ((j == i) && (num == 0)) {
268f5b1c8a1SJohn Marino /* Is this is one long chunk?, if so, keep on
269f5b1c8a1SJohn Marino * reading until a new line. */
270f5b1c8a1SJohn Marino if (p == (unsigned char *)&(ctx->tmp[0])) {
271f5b1c8a1SJohn Marino /* Check buffer full */
272f5b1c8a1SJohn Marino if (i == B64_BLOCK_SIZE) {
273f5b1c8a1SJohn Marino ctx->tmp_nl = 1;
274f5b1c8a1SJohn Marino ctx->tmp_len = 0;
275f5b1c8a1SJohn Marino }
276f5b1c8a1SJohn Marino }
277f5b1c8a1SJohn Marino else if (p != q) /* finished on a '\n' */
278f5b1c8a1SJohn Marino {
279f5b1c8a1SJohn Marino n = q - p;
280f5b1c8a1SJohn Marino for (ii = 0; ii < n; ii++)
281f5b1c8a1SJohn Marino ctx->tmp[ii] = p[ii];
282f5b1c8a1SJohn Marino ctx->tmp_len = n;
283f5b1c8a1SJohn Marino }
284f5b1c8a1SJohn Marino /* else finished on a '\n' */
285f5b1c8a1SJohn Marino continue;
286f5b1c8a1SJohn Marino } else {
287f5b1c8a1SJohn Marino ctx->tmp_len = 0;
288f5b1c8a1SJohn Marino }
289f5b1c8a1SJohn Marino } else if ((i < B64_BLOCK_SIZE) && (ctx->cont > 0)) {
290f5b1c8a1SJohn Marino /* If buffer isn't full and we can retry then
291f5b1c8a1SJohn Marino * restart to read in more data.
292f5b1c8a1SJohn Marino */
293f5b1c8a1SJohn Marino continue;
294f5b1c8a1SJohn Marino }
295f5b1c8a1SJohn Marino
296f5b1c8a1SJohn Marino if (BIO_get_flags(b) & BIO_FLAGS_BASE64_NO_NL) {
297f5b1c8a1SJohn Marino int z, jj;
298f5b1c8a1SJohn Marino
299f5b1c8a1SJohn Marino jj = i & ~3; /* process per 4 */
300f5b1c8a1SJohn Marino z = EVP_DecodeBlock((unsigned char *)ctx->buf,
301f5b1c8a1SJohn Marino (unsigned char *)ctx->tmp, jj);
302f5b1c8a1SJohn Marino if (jj > 2) {
303f5b1c8a1SJohn Marino if (ctx->tmp[jj-1] == '=') {
304f5b1c8a1SJohn Marino z--;
305f5b1c8a1SJohn Marino if (ctx->tmp[jj-2] == '=')
306f5b1c8a1SJohn Marino z--;
307f5b1c8a1SJohn Marino }
308f5b1c8a1SJohn Marino }
309f5b1c8a1SJohn Marino /* z is now number of output bytes and jj is the
310f5b1c8a1SJohn Marino * number consumed */
311f5b1c8a1SJohn Marino if (jj != i) {
312f5b1c8a1SJohn Marino memmove(ctx->tmp, &ctx->tmp[jj], i - jj);
313f5b1c8a1SJohn Marino ctx->tmp_len = i - jj;
314f5b1c8a1SJohn Marino }
315f5b1c8a1SJohn Marino ctx->buf_len = 0;
316f5b1c8a1SJohn Marino if (z > 0) {
317f5b1c8a1SJohn Marino ctx->buf_len = z;
318f5b1c8a1SJohn Marino }
319f5b1c8a1SJohn Marino i = z;
320f5b1c8a1SJohn Marino } else {
321f5b1c8a1SJohn Marino i = EVP_DecodeUpdate(&(ctx->base64),
322f5b1c8a1SJohn Marino (unsigned char *)ctx->buf, &ctx->buf_len,
323f5b1c8a1SJohn Marino (unsigned char *)ctx->tmp, i);
324f5b1c8a1SJohn Marino ctx->tmp_len = 0;
325f5b1c8a1SJohn Marino }
326f5b1c8a1SJohn Marino ctx->buf_off = 0;
327f5b1c8a1SJohn Marino if (i < 0) {
328f5b1c8a1SJohn Marino ret_code = 0;
329f5b1c8a1SJohn Marino ctx->buf_len = 0;
330f5b1c8a1SJohn Marino break;
331f5b1c8a1SJohn Marino }
332f5b1c8a1SJohn Marino
333f5b1c8a1SJohn Marino if (ctx->buf_len <= outl)
334f5b1c8a1SJohn Marino i = ctx->buf_len;
335f5b1c8a1SJohn Marino else
336f5b1c8a1SJohn Marino i = outl;
337f5b1c8a1SJohn Marino
338f5b1c8a1SJohn Marino memcpy(out, ctx->buf, i);
339f5b1c8a1SJohn Marino ret += i;
340f5b1c8a1SJohn Marino ctx->buf_off = i;
341f5b1c8a1SJohn Marino if (ctx->buf_off == ctx->buf_len) {
342f5b1c8a1SJohn Marino ctx->buf_len = 0;
343f5b1c8a1SJohn Marino ctx->buf_off = 0;
344f5b1c8a1SJohn Marino }
345f5b1c8a1SJohn Marino outl -= i;
346f5b1c8a1SJohn Marino out += i;
347f5b1c8a1SJohn Marino }
348f5b1c8a1SJohn Marino /* BIO_clear_retry_flags(b); */
349f5b1c8a1SJohn Marino BIO_copy_next_retry(b);
350f5b1c8a1SJohn Marino return ((ret == 0) ? ret_code : ret);
351f5b1c8a1SJohn Marino }
352f5b1c8a1SJohn Marino
353f5b1c8a1SJohn Marino static int
b64_write(BIO * b,const char * in,int inl)354f5b1c8a1SJohn Marino b64_write(BIO *b, const char *in, int inl)
355f5b1c8a1SJohn Marino {
356f5b1c8a1SJohn Marino int ret = 0;
357f5b1c8a1SJohn Marino int n;
358f5b1c8a1SJohn Marino int i;
359f5b1c8a1SJohn Marino BIO_B64_CTX *ctx;
360f5b1c8a1SJohn Marino
361f5b1c8a1SJohn Marino ctx = (BIO_B64_CTX *)b->ptr;
362f5b1c8a1SJohn Marino BIO_clear_retry_flags(b);
363f5b1c8a1SJohn Marino
364f5b1c8a1SJohn Marino if (ctx->encode != B64_ENCODE) {
365f5b1c8a1SJohn Marino ctx->encode = B64_ENCODE;
366f5b1c8a1SJohn Marino ctx->buf_len = 0;
367f5b1c8a1SJohn Marino ctx->buf_off = 0;
368f5b1c8a1SJohn Marino ctx->tmp_len = 0;
369f5b1c8a1SJohn Marino EVP_EncodeInit(&(ctx->base64));
370f5b1c8a1SJohn Marino }
371f5b1c8a1SJohn Marino
372f5b1c8a1SJohn Marino OPENSSL_assert(ctx->buf_off < (int)sizeof(ctx->buf));
373f5b1c8a1SJohn Marino OPENSSL_assert(ctx->buf_len <= (int)sizeof(ctx->buf));
374f5b1c8a1SJohn Marino OPENSSL_assert(ctx->buf_len >= ctx->buf_off);
375f5b1c8a1SJohn Marino n = ctx->buf_len - ctx->buf_off;
376f5b1c8a1SJohn Marino while (n > 0) {
377f5b1c8a1SJohn Marino i = BIO_write(b->next_bio, &(ctx->buf[ctx->buf_off]), n);
378f5b1c8a1SJohn Marino if (i <= 0) {
379f5b1c8a1SJohn Marino BIO_copy_next_retry(b);
380f5b1c8a1SJohn Marino return (i);
381f5b1c8a1SJohn Marino }
382f5b1c8a1SJohn Marino OPENSSL_assert(i <= n);
383f5b1c8a1SJohn Marino ctx->buf_off += i;
384f5b1c8a1SJohn Marino OPENSSL_assert(ctx->buf_off <= (int)sizeof(ctx->buf));
385f5b1c8a1SJohn Marino OPENSSL_assert(ctx->buf_len >= ctx->buf_off);
386f5b1c8a1SJohn Marino n -= i;
387f5b1c8a1SJohn Marino }
388f5b1c8a1SJohn Marino /* at this point all pending data has been written */
389f5b1c8a1SJohn Marino ctx->buf_off = 0;
390f5b1c8a1SJohn Marino ctx->buf_len = 0;
391f5b1c8a1SJohn Marino
392f5b1c8a1SJohn Marino if ((in == NULL) || (inl <= 0))
393f5b1c8a1SJohn Marino return (0);
394f5b1c8a1SJohn Marino
395f5b1c8a1SJohn Marino while (inl > 0) {
396f5b1c8a1SJohn Marino n = (inl > B64_BLOCK_SIZE) ? B64_BLOCK_SIZE : inl;
397f5b1c8a1SJohn Marino
398f5b1c8a1SJohn Marino if (BIO_get_flags(b) & BIO_FLAGS_BASE64_NO_NL) {
399f5b1c8a1SJohn Marino if (ctx->tmp_len > 0) {
400f5b1c8a1SJohn Marino OPENSSL_assert(ctx->tmp_len <= 3);
401f5b1c8a1SJohn Marino n = 3 - ctx->tmp_len;
402f5b1c8a1SJohn Marino /* There's a theoretical possibility for this */
403f5b1c8a1SJohn Marino if (n > inl)
404f5b1c8a1SJohn Marino n = inl;
405f5b1c8a1SJohn Marino memcpy(&(ctx->tmp[ctx->tmp_len]), in, n);
406f5b1c8a1SJohn Marino ctx->tmp_len += n;
407f5b1c8a1SJohn Marino ret += n;
408f5b1c8a1SJohn Marino if (ctx->tmp_len < 3)
409f5b1c8a1SJohn Marino break;
410f5b1c8a1SJohn Marino ctx->buf_len = EVP_EncodeBlock(
411f5b1c8a1SJohn Marino (unsigned char *)ctx->buf,
412f5b1c8a1SJohn Marino (unsigned char *)ctx->tmp, ctx->tmp_len);
413f5b1c8a1SJohn Marino OPENSSL_assert(ctx->buf_len <=
414f5b1c8a1SJohn Marino (int)sizeof(ctx->buf));
415f5b1c8a1SJohn Marino OPENSSL_assert(ctx->buf_len >= ctx->buf_off);
416f5b1c8a1SJohn Marino /* Since we're now done using the temporary
417f5b1c8a1SJohn Marino buffer, the length should be 0'd */
418f5b1c8a1SJohn Marino ctx->tmp_len = 0;
419f5b1c8a1SJohn Marino } else {
420f5b1c8a1SJohn Marino if (n < 3) {
421f5b1c8a1SJohn Marino memcpy(ctx->tmp, in, n);
422f5b1c8a1SJohn Marino ctx->tmp_len = n;
423f5b1c8a1SJohn Marino ret += n;
424f5b1c8a1SJohn Marino break;
425f5b1c8a1SJohn Marino }
426f5b1c8a1SJohn Marino n -= n % 3;
427f5b1c8a1SJohn Marino ctx->buf_len = EVP_EncodeBlock(
428f5b1c8a1SJohn Marino (unsigned char *)ctx->buf,
429f5b1c8a1SJohn Marino (const unsigned char *)in, n);
430f5b1c8a1SJohn Marino OPENSSL_assert(ctx->buf_len <=
431f5b1c8a1SJohn Marino (int)sizeof(ctx->buf));
432f5b1c8a1SJohn Marino OPENSSL_assert(ctx->buf_len >= ctx->buf_off);
433f5b1c8a1SJohn Marino ret += n;
434f5b1c8a1SJohn Marino }
435f5b1c8a1SJohn Marino } else {
43672c33676SMaxim Ag if (!EVP_EncodeUpdate(&(ctx->base64),
437f5b1c8a1SJohn Marino (unsigned char *)ctx->buf, &ctx->buf_len,
43872c33676SMaxim Ag (unsigned char *)in, n))
43972c33676SMaxim Ag return ((ret == 0) ? -1 : ret);
440f5b1c8a1SJohn Marino OPENSSL_assert(ctx->buf_len <= (int)sizeof(ctx->buf));
441f5b1c8a1SJohn Marino OPENSSL_assert(ctx->buf_len >= ctx->buf_off);
442f5b1c8a1SJohn Marino ret += n;
443f5b1c8a1SJohn Marino }
444f5b1c8a1SJohn Marino inl -= n;
445f5b1c8a1SJohn Marino in += n;
446f5b1c8a1SJohn Marino
447f5b1c8a1SJohn Marino ctx->buf_off = 0;
448f5b1c8a1SJohn Marino n = ctx->buf_len;
449f5b1c8a1SJohn Marino while (n > 0) {
450f5b1c8a1SJohn Marino i = BIO_write(b->next_bio, &(ctx->buf[ctx->buf_off]), n);
451f5b1c8a1SJohn Marino if (i <= 0) {
452f5b1c8a1SJohn Marino BIO_copy_next_retry(b);
453f5b1c8a1SJohn Marino return ((ret == 0) ? i : ret);
454f5b1c8a1SJohn Marino }
455f5b1c8a1SJohn Marino OPENSSL_assert(i <= n);
456f5b1c8a1SJohn Marino n -= i;
457f5b1c8a1SJohn Marino ctx->buf_off += i;
458f5b1c8a1SJohn Marino OPENSSL_assert(ctx->buf_off <= (int)sizeof(ctx->buf));
459f5b1c8a1SJohn Marino OPENSSL_assert(ctx->buf_len >= ctx->buf_off);
460f5b1c8a1SJohn Marino }
461f5b1c8a1SJohn Marino ctx->buf_len = 0;
462f5b1c8a1SJohn Marino ctx->buf_off = 0;
463f5b1c8a1SJohn Marino }
464f5b1c8a1SJohn Marino return (ret);
465f5b1c8a1SJohn Marino }
466f5b1c8a1SJohn Marino
467f5b1c8a1SJohn Marino static long
b64_ctrl(BIO * b,int cmd,long num,void * ptr)468f5b1c8a1SJohn Marino b64_ctrl(BIO *b, int cmd, long num, void *ptr)
469f5b1c8a1SJohn Marino {
470f5b1c8a1SJohn Marino BIO_B64_CTX *ctx;
471f5b1c8a1SJohn Marino long ret = 1;
472f5b1c8a1SJohn Marino int i;
473f5b1c8a1SJohn Marino
474f5b1c8a1SJohn Marino ctx = (BIO_B64_CTX *)b->ptr;
475f5b1c8a1SJohn Marino
476f5b1c8a1SJohn Marino switch (cmd) {
477f5b1c8a1SJohn Marino case BIO_CTRL_RESET:
478f5b1c8a1SJohn Marino ctx->cont = 1;
479f5b1c8a1SJohn Marino ctx->start = 1;
480f5b1c8a1SJohn Marino ctx->encode = B64_NONE;
481f5b1c8a1SJohn Marino ret = BIO_ctrl(b->next_bio, cmd, num, ptr);
482f5b1c8a1SJohn Marino break;
483f5b1c8a1SJohn Marino case BIO_CTRL_EOF: /* More to read */
484f5b1c8a1SJohn Marino if (ctx->cont <= 0)
485f5b1c8a1SJohn Marino ret = 1;
486f5b1c8a1SJohn Marino else
487f5b1c8a1SJohn Marino ret = BIO_ctrl(b->next_bio, cmd, num, ptr);
488f5b1c8a1SJohn Marino break;
489f5b1c8a1SJohn Marino case BIO_CTRL_WPENDING: /* More to write in buffer */
490f5b1c8a1SJohn Marino OPENSSL_assert(ctx->buf_len >= ctx->buf_off);
491f5b1c8a1SJohn Marino ret = ctx->buf_len - ctx->buf_off;
492f5b1c8a1SJohn Marino if ((ret == 0) && (ctx->encode != B64_NONE) &&
493f5b1c8a1SJohn Marino (ctx->base64.num != 0))
494f5b1c8a1SJohn Marino ret = 1;
495f5b1c8a1SJohn Marino else if (ret <= 0)
496f5b1c8a1SJohn Marino ret = BIO_ctrl(b->next_bio, cmd, num, ptr);
497f5b1c8a1SJohn Marino break;
498f5b1c8a1SJohn Marino case BIO_CTRL_PENDING: /* More to read in buffer */
499f5b1c8a1SJohn Marino OPENSSL_assert(ctx->buf_len >= ctx->buf_off);
500f5b1c8a1SJohn Marino ret = ctx->buf_len - ctx->buf_off;
501f5b1c8a1SJohn Marino if (ret <= 0)
502f5b1c8a1SJohn Marino ret = BIO_ctrl(b->next_bio, cmd, num, ptr);
503f5b1c8a1SJohn Marino break;
504f5b1c8a1SJohn Marino case BIO_CTRL_FLUSH:
505f5b1c8a1SJohn Marino /* do a final write */
506f5b1c8a1SJohn Marino again:
507f5b1c8a1SJohn Marino while (ctx->buf_len != ctx->buf_off) {
508f5b1c8a1SJohn Marino i = b64_write(b, NULL, 0);
509f5b1c8a1SJohn Marino if (i < 0)
510f5b1c8a1SJohn Marino return i;
511f5b1c8a1SJohn Marino }
512f5b1c8a1SJohn Marino if (BIO_get_flags(b) & BIO_FLAGS_BASE64_NO_NL) {
513f5b1c8a1SJohn Marino if (ctx->tmp_len != 0) {
514f5b1c8a1SJohn Marino ctx->buf_len = EVP_EncodeBlock(
515f5b1c8a1SJohn Marino (unsigned char *)ctx->buf,
516f5b1c8a1SJohn Marino (unsigned char *)ctx->tmp,
517f5b1c8a1SJohn Marino ctx->tmp_len);
518f5b1c8a1SJohn Marino ctx->buf_off = 0;
519f5b1c8a1SJohn Marino ctx->tmp_len = 0;
520f5b1c8a1SJohn Marino goto again;
521f5b1c8a1SJohn Marino }
522f5b1c8a1SJohn Marino } else if (ctx->encode != B64_NONE && ctx->base64.num != 0) {
523f5b1c8a1SJohn Marino ctx->buf_off = 0;
524f5b1c8a1SJohn Marino EVP_EncodeFinal(&(ctx->base64),
525f5b1c8a1SJohn Marino (unsigned char *)ctx->buf,
526f5b1c8a1SJohn Marino &(ctx->buf_len));
527f5b1c8a1SJohn Marino /* push out the bytes */
528f5b1c8a1SJohn Marino goto again;
529f5b1c8a1SJohn Marino }
530f5b1c8a1SJohn Marino /* Finally flush the underlying BIO */
531f5b1c8a1SJohn Marino ret = BIO_ctrl(b->next_bio, cmd, num, ptr);
532f5b1c8a1SJohn Marino break;
533f5b1c8a1SJohn Marino
534f5b1c8a1SJohn Marino case BIO_C_DO_STATE_MACHINE:
535f5b1c8a1SJohn Marino BIO_clear_retry_flags(b);
536f5b1c8a1SJohn Marino ret = BIO_ctrl(b->next_bio, cmd, num, ptr);
537f5b1c8a1SJohn Marino BIO_copy_next_retry(b);
538f5b1c8a1SJohn Marino break;
539f5b1c8a1SJohn Marino
540f5b1c8a1SJohn Marino case BIO_CTRL_DUP:
541f5b1c8a1SJohn Marino break;
542f5b1c8a1SJohn Marino case BIO_CTRL_INFO:
543f5b1c8a1SJohn Marino case BIO_CTRL_GET:
544f5b1c8a1SJohn Marino case BIO_CTRL_SET:
545f5b1c8a1SJohn Marino default:
546f5b1c8a1SJohn Marino ret = BIO_ctrl(b->next_bio, cmd, num, ptr);
547f5b1c8a1SJohn Marino break;
548f5b1c8a1SJohn Marino }
549f5b1c8a1SJohn Marino return (ret);
550f5b1c8a1SJohn Marino }
551f5b1c8a1SJohn Marino
552f5b1c8a1SJohn Marino static long
b64_callback_ctrl(BIO * b,int cmd,BIO_info_cb * fp)553*de0e0e4dSAntonio Huete Jimenez b64_callback_ctrl(BIO *b, int cmd, BIO_info_cb *fp)
554f5b1c8a1SJohn Marino {
555f5b1c8a1SJohn Marino long ret = 1;
556f5b1c8a1SJohn Marino
557f5b1c8a1SJohn Marino if (b->next_bio == NULL)
558f5b1c8a1SJohn Marino return (0);
559f5b1c8a1SJohn Marino switch (cmd) {
560f5b1c8a1SJohn Marino default:
561f5b1c8a1SJohn Marino ret = BIO_callback_ctrl(b->next_bio, cmd, fp);
562f5b1c8a1SJohn Marino break;
563f5b1c8a1SJohn Marino }
564f5b1c8a1SJohn Marino return (ret);
565f5b1c8a1SJohn Marino }
566f5b1c8a1SJohn Marino
567f5b1c8a1SJohn Marino static int
b64_puts(BIO * b,const char * str)568f5b1c8a1SJohn Marino b64_puts(BIO *b, const char *str)
569f5b1c8a1SJohn Marino {
570f5b1c8a1SJohn Marino return b64_write(b, str, strlen(str));
571f5b1c8a1SJohn Marino }
572