1 /* $OpenBSD: encode.c,v 1.29 2021/12/12 21:30:13 tb Exp $ */
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.]
63 #include <openssl/evp.h>
67 static unsigned char conv_ascii2bin(unsigned char a);
68 #define conv_bin2ascii(a) (data_bin2ascii[(a)&0x3f])
72 * left over chars are set to =
77 #define BIN_PER_LINE (64/4*3)
78 #define CHUNKS_PER_LINE (64/4)
79 #define CHAR_PER_LINE (64+1)
81 static const unsigned char data_bin2ascii[65] = "ABCDEFGHIJKLMNOPQRSTUVWXYZ\
82 abcdefghijklmnopqrstuvwxyz0123456789+/";
85 * 0xF1 is ignore but next needs to be 0xF0 (for \r\n processing).
87 * 0xE0 is ignore at start of line.
95 #define B64_ERROR 0xFF
96 #define B64_NOT_BASE64(a) (((a)|0x13) == 0xF3)
97 #define B64_BASE64(a) !B64_NOT_BASE64(a)
99 static const unsigned char data_ascii2bin[128] = {
100 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
101 0xFF, 0xE0, 0xF0, 0xFF, 0xFF, 0xF1, 0xFF, 0xFF,
102 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
103 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
104 0xE0, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
105 0xFF, 0xFF, 0xFF, 0x3E, 0xFF, 0xF2, 0xFF, 0x3F,
106 0x34, 0x35, 0x36, 0x37, 0x38, 0x39, 0x3A, 0x3B,
107 0x3C, 0x3D, 0xFF, 0xFF, 0xFF, 0x00, 0xFF, 0xFF,
108 0xFF, 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06,
109 0x07, 0x08, 0x09, 0x0A, 0x0B, 0x0C, 0x0D, 0x0E,
110 0x0F, 0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16,
111 0x17, 0x18, 0x19, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
112 0xFF, 0x1A, 0x1B, 0x1C, 0x1D, 0x1E, 0x1F, 0x20,
113 0x21, 0x22, 0x23, 0x24, 0x25, 0x26, 0x27, 0x28,
114 0x29, 0x2A, 0x2B, 0x2C, 0x2D, 0x2E, 0x2F, 0x30,
115 0x31, 0x32, 0x33, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
119 conv_ascii2bin(unsigned char a)
123 return data_ascii2bin[a];
127 EVP_ENCODE_CTX_new(void)
129 return calloc(1, sizeof(EVP_ENCODE_CTX));
133 EVP_ENCODE_CTX_free(EVP_ENCODE_CTX *ctx)
139 EVP_EncodeInit(EVP_ENCODE_CTX *ctx)
147 EVP_EncodeUpdate(EVP_ENCODE_CTX *ctx, unsigned char *out, int *outl,
148 const unsigned char *in, int inl)
156 OPENSSL_assert(ctx->length <= (int)sizeof(ctx->enc_data));
157 if (ctx->length - ctx->num > inl) {
158 memcpy(&(ctx->enc_data[ctx->num]), in, inl);
163 i = ctx->length - ctx->num;
164 memcpy(&(ctx->enc_data[ctx->num]), in, i);
167 j = EVP_EncodeBlock(out, ctx->enc_data, ctx->length);
174 while (inl >= ctx->length && total <= INT_MAX) {
175 j = EVP_EncodeBlock(out, in, ctx->length);
183 if (total > INT_MAX) {
184 /* Too much output data! */
189 memcpy(&(ctx->enc_data[0]), in, inl);
197 EVP_EncodeFinal(EVP_ENCODE_CTX *ctx, unsigned char *out, int *outl)
199 unsigned int ret = 0;
202 ret = EVP_EncodeBlock(out, ctx->enc_data, ctx->num);
211 EVP_EncodeBlock(unsigned char *t, const unsigned char *f, int dlen)
216 for (i = dlen; i > 0; i -= 3) {
218 l = (((unsigned long)f[0]) << 16L) |
219 (((unsigned long)f[1]) << 8L) | f[2];
220 *(t++) = conv_bin2ascii(l >> 18L);
221 *(t++) = conv_bin2ascii(l >> 12L);
222 *(t++) = conv_bin2ascii(l >> 6L);
223 *(t++) = conv_bin2ascii(l );
225 l = ((unsigned long)f[0]) << 16L;
227 l |= ((unsigned long)f[1] << 8L);
229 *(t++) = conv_bin2ascii(l >> 18L);
230 *(t++) = conv_bin2ascii(l >> 12L);
231 *(t++) = (i == 1) ? '=' : conv_bin2ascii(l >> 6L);
243 EVP_DecodeInit(EVP_ENCODE_CTX *ctx)
252 EVP_DecodeUpdate(EVP_ENCODE_CTX *ctx, unsigned char *out, int *outl,
253 const unsigned char *in, int inl)
255 int seof = 0, eof = 0, rv = -1, ret = 0, i, v, tmp, n, decoded_len;
261 if (n > 0 && d[n - 1] == '=') {
263 if (n > 1 && d[n - 2] == '=')
267 /* Legacy behaviour: an empty input chunk signals end of input. */
273 for (i = 0; i < inl; i++) {
275 v = conv_ascii2bin(tmp);
276 if (v == B64_ERROR) {
283 } else if (eof > 0 && B64_BASE64(v)) {
284 /* More data after padding. */
299 /* Only save valid base64 characters. */
303 * We increment n once per loop, and empty the
304 * buffer as soon as we reach 64 characters, so
305 * this can only happen if someone's manually
306 * messed with the ctx. Refuse to write any
312 OPENSSL_assert(n < (int)sizeof(ctx->enc_data));
317 decoded_len = EVP_DecodeBlock(out, d, n);
319 if (decoded_len < 0 || eof > decoded_len) {
323 ret += decoded_len - eof;
324 out += decoded_len - eof;
329 * Legacy behaviour: if the current line is a full base64-block (i.e.,
330 * has 0 mod 4 base64 characters), it is processed immediately. We keep
331 * this behaviour as applications may not be calling EVP_DecodeFinal
337 decoded_len = EVP_DecodeBlock(out, d, n);
339 if (decoded_len < 0 || eof > decoded_len) {
343 ret += (decoded_len - eof);
345 /* EOF in the middle of a base64 block. */
351 rv = seof || (n == 0 && eof) ? 0 : 1;
353 /* Legacy behaviour. This should probably rather be zeroed on error. */
360 EVP_DecodeBlock(unsigned char *t, const unsigned char *f, int n)
362 int i, ret = 0, a, b, c, d;
365 /* trim white space from the start of the line. */
366 while ((conv_ascii2bin(*f) == B64_WS) && (n > 0)) {
371 /* strip off stuff at the end of the line
372 * ascii2bin values B64_WS, B64_EOLN, B64_EOLN and B64_EOF */
373 while ((n > 3) && (B64_NOT_BASE64(conv_ascii2bin(f[n - 1]))))
379 for (i = 0; i < n; i += 4) {
380 a = conv_ascii2bin(*(f++));
381 b = conv_ascii2bin(*(f++));
382 c = conv_ascii2bin(*(f++));
383 d = conv_ascii2bin(*(f++));
384 if ((a & 0x80) || (b & 0x80) ||
385 (c & 0x80) || (d & 0x80))
387 l = ((((unsigned long)a) << 18L) |
388 (((unsigned long)b) << 12L) |
389 (((unsigned long)c) << 6L) |
390 (((unsigned long)d)));
391 *(t++) = (unsigned char)(l >> 16L) & 0xff;
392 *(t++) = (unsigned char)(l >> 8L) & 0xff;
393 *(t++) = (unsigned char)(l) & 0xff;
400 EVP_DecodeFinal(EVP_ENCODE_CTX *ctx, unsigned char *out, int *outl)
406 i = EVP_DecodeBlock(out, ctx->enc_data, ctx->num);