1 /* $OpenBSD: encode.c,v 1.28 2020/03/04 11:53:21 inoguchi 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>
65 static unsigned char conv_ascii2bin(unsigned char a);
66 #define conv_bin2ascii(a) (data_bin2ascii[(a)&0x3f])
70 * left over chars are set to =
75 #define BIN_PER_LINE (64/4*3)
76 #define CHUNKS_PER_LINE (64/4)
77 #define CHAR_PER_LINE (64+1)
79 static const unsigned char data_bin2ascii[65] = "ABCDEFGHIJKLMNOPQRSTUVWXYZ\
80 abcdefghijklmnopqrstuvwxyz0123456789+/";
83 * 0xF1 is ignore but next needs to be 0xF0 (for \r\n processing).
85 * 0xE0 is ignore at start of line.
93 #define B64_ERROR 0xFF
94 #define B64_NOT_BASE64(a) (((a)|0x13) == 0xF3)
95 #define B64_BASE64(a) !B64_NOT_BASE64(a)
97 static const unsigned char data_ascii2bin[128] = {
98 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
99 0xFF, 0xE0, 0xF0, 0xFF, 0xFF, 0xF1, 0xFF, 0xFF,
100 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
101 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
102 0xE0, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
103 0xFF, 0xFF, 0xFF, 0x3E, 0xFF, 0xF2, 0xFF, 0x3F,
104 0x34, 0x35, 0x36, 0x37, 0x38, 0x39, 0x3A, 0x3B,
105 0x3C, 0x3D, 0xFF, 0xFF, 0xFF, 0x00, 0xFF, 0xFF,
106 0xFF, 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06,
107 0x07, 0x08, 0x09, 0x0A, 0x0B, 0x0C, 0x0D, 0x0E,
108 0x0F, 0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16,
109 0x17, 0x18, 0x19, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
110 0xFF, 0x1A, 0x1B, 0x1C, 0x1D, 0x1E, 0x1F, 0x20,
111 0x21, 0x22, 0x23, 0x24, 0x25, 0x26, 0x27, 0x28,
112 0x29, 0x2A, 0x2B, 0x2C, 0x2D, 0x2E, 0x2F, 0x30,
113 0x31, 0x32, 0x33, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
117 conv_ascii2bin(unsigned char a)
121 return data_ascii2bin[a];
125 EVP_ENCODE_CTX_new(void)
127 return calloc(1, sizeof(EVP_ENCODE_CTX));
131 EVP_ENCODE_CTX_free(EVP_ENCODE_CTX *ctx)
137 EVP_EncodeInit(EVP_ENCODE_CTX *ctx)
145 EVP_EncodeUpdate(EVP_ENCODE_CTX *ctx, unsigned char *out, int *outl,
146 const unsigned char *in, int inl)
154 OPENSSL_assert(ctx->length <= (int)sizeof(ctx->enc_data));
155 if (ctx->length - ctx->num > inl) {
156 memcpy(&(ctx->enc_data[ctx->num]), in, inl);
161 i = ctx->length - ctx->num;
162 memcpy(&(ctx->enc_data[ctx->num]), in, i);
165 j = EVP_EncodeBlock(out, ctx->enc_data, ctx->length);
172 while (inl >= ctx->length && total <= INT_MAX) {
173 j = EVP_EncodeBlock(out, in, ctx->length);
181 if (total > INT_MAX) {
182 /* Too much output data! */
187 memcpy(&(ctx->enc_data[0]), in, inl);
195 EVP_EncodeFinal(EVP_ENCODE_CTX *ctx, unsigned char *out, int *outl)
197 unsigned int ret = 0;
200 ret = EVP_EncodeBlock(out, ctx->enc_data, ctx->num);
209 EVP_EncodeBlock(unsigned char *t, const unsigned char *f, int dlen)
214 for (i = dlen; i > 0; i -= 3) {
216 l = (((unsigned long)f[0]) << 16L) |
217 (((unsigned long)f[1]) << 8L) | f[2];
218 *(t++) = conv_bin2ascii(l >> 18L);
219 *(t++) = conv_bin2ascii(l >> 12L);
220 *(t++) = conv_bin2ascii(l >> 6L);
221 *(t++) = conv_bin2ascii(l );
223 l = ((unsigned long)f[0]) << 16L;
225 l |= ((unsigned long)f[1] << 8L);
227 *(t++) = conv_bin2ascii(l >> 18L);
228 *(t++) = conv_bin2ascii(l >> 12L);
229 *(t++) = (i == 1) ? '=' : conv_bin2ascii(l >> 6L);
241 EVP_DecodeInit(EVP_ENCODE_CTX *ctx)
250 EVP_DecodeUpdate(EVP_ENCODE_CTX *ctx, unsigned char *out, int *outl,
251 const unsigned char *in, int inl)
253 int seof = 0, eof = 0, rv = -1, ret = 0, i, v, tmp, n, decoded_len;
259 if (n > 0 && d[n - 1] == '=') {
261 if (n > 1 && d[n - 2] == '=')
265 /* Legacy behaviour: an empty input chunk signals end of input. */
271 for (i = 0; i < inl; i++) {
273 v = conv_ascii2bin(tmp);
274 if (v == B64_ERROR) {
281 } else if (eof > 0 && B64_BASE64(v)) {
282 /* More data after padding. */
297 /* Only save valid base64 characters. */
301 * We increment n once per loop, and empty the
302 * buffer as soon as we reach 64 characters, so
303 * this can only happen if someone's manually
304 * messed with the ctx. Refuse to write any
310 OPENSSL_assert(n < (int)sizeof(ctx->enc_data));
315 decoded_len = EVP_DecodeBlock(out, d, n);
317 if (decoded_len < 0 || eof > decoded_len) {
321 ret += decoded_len - eof;
322 out += decoded_len - eof;
327 * Legacy behaviour: if the current line is a full base64-block (i.e.,
328 * has 0 mod 4 base64 characters), it is processed immediately. We keep
329 * this behaviour as applications may not be calling EVP_DecodeFinal
335 decoded_len = EVP_DecodeBlock(out, d, n);
337 if (decoded_len < 0 || eof > decoded_len) {
341 ret += (decoded_len - eof);
343 /* EOF in the middle of a base64 block. */
349 rv = seof || (n == 0 && eof) ? 0 : 1;
351 /* Legacy behaviour. This should probably rather be zeroed on error. */
358 EVP_DecodeBlock(unsigned char *t, const unsigned char *f, int n)
360 int i, ret = 0, a, b, c, d;
363 /* trim white space from the start of the line. */
364 while ((conv_ascii2bin(*f) == B64_WS) && (n > 0)) {
369 /* strip off stuff at the end of the line
370 * ascii2bin values B64_WS, B64_EOLN, B64_EOLN and B64_EOF */
371 while ((n > 3) && (B64_NOT_BASE64(conv_ascii2bin(f[n - 1]))))
377 for (i = 0; i < n; i += 4) {
378 a = conv_ascii2bin(*(f++));
379 b = conv_ascii2bin(*(f++));
380 c = conv_ascii2bin(*(f++));
381 d = conv_ascii2bin(*(f++));
382 if ((a & 0x80) || (b & 0x80) ||
383 (c & 0x80) || (d & 0x80))
385 l = ((((unsigned long)a) << 18L) |
386 (((unsigned long)b) << 12L) |
387 (((unsigned long)c) << 6L) |
388 (((unsigned long)d)));
389 *(t++) = (unsigned char)(l >> 16L) & 0xff;
390 *(t++) = (unsigned char)(l >> 8L) & 0xff;
391 *(t++) = (unsigned char)(l) & 0xff;
398 EVP_DecodeFinal(EVP_ENCODE_CTX *ctx, unsigned char *out, int *outl)
404 i = EVP_DecodeBlock(out, ctx->enc_data, ctx->num);