1 /* crypto/evp/encode.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.]
62 #include <openssl/evp.h>
64 #ifndef CHARSET_EBCDIC
65 # define conv_bin2ascii(a) (data_bin2ascii[(a)&0x3f])
66 # define conv_ascii2bin(a) (data_ascii2bin[(a)&0x7f])
69 * We assume that PEM encoded files are EBCDIC files (i.e., printable text
70 * files). Convert them here while decoding. When encoding, output is EBCDIC
71 * (text) format again. (No need for conversion in the conv_bin2ascii macro,
72 * as the underlying textstring data_bin2ascii[] is already EBCDIC)
74 # define conv_bin2ascii(a) (data_bin2ascii[(a)&0x3f])
75 # define conv_ascii2bin(a) (data_ascii2bin[os_toascii[a]&0x7f])
81 * left over chars are set to =
86 #define BIN_PER_LINE (64/4*3)
87 #define CHUNKS_PER_LINE (64/4)
88 #define CHAR_PER_LINE (64+1)
90 static unsigned char data_bin2ascii[65] = "ABCDEFGHIJKLMNOPQRSTUVWXYZ\
91 abcdefghijklmnopqrstuvwxyz0123456789+/";
95 * 0xF1 is ignore but next needs to be 0xF0 (for \r\n processing).
97 * 0xE0 is ignore at start of line.
101 #define B64_EOLN 0xF0
105 #define B64_ERROR 0xFF
106 #define B64_NOT_BASE64(a) (((a)|0x13) == 0xF3)
108 static unsigned char data_ascii2bin[128] = {
109 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
110 0xFF, 0xE0, 0xF0, 0xFF, 0xFF, 0xF1, 0xFF, 0xFF,
111 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
112 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
113 0xE0, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
114 0xFF, 0xFF, 0xFF, 0x3E, 0xFF, 0xF2, 0xFF, 0x3F,
115 0x34, 0x35, 0x36, 0x37, 0x38, 0x39, 0x3A, 0x3B,
116 0x3C, 0x3D, 0xFF, 0xFF, 0xFF, 0x00, 0xFF, 0xFF,
117 0xFF, 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06,
118 0x07, 0x08, 0x09, 0x0A, 0x0B, 0x0C, 0x0D, 0x0E,
119 0x0F, 0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16,
120 0x17, 0x18, 0x19, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
121 0xFF, 0x1A, 0x1B, 0x1C, 0x1D, 0x1E, 0x1F, 0x20,
122 0x21, 0x22, 0x23, 0x24, 0x25, 0x26, 0x27, 0x28,
123 0x29, 0x2A, 0x2B, 0x2C, 0x2D, 0x2E, 0x2F, 0x30,
124 0x31, 0x32, 0x33, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
127 void EVP_EncodeInit(EVP_ENCODE_CTX *ctx)
134 void EVP_EncodeUpdate(EVP_ENCODE_CTX *ctx, unsigned char *out, int *outl,
135 const unsigned char *in, int inl)
143 OPENSSL_assert(ctx->length <= (int)sizeof(ctx->enc_data));
144 if (ctx->length - ctx->num > inl) {
145 memcpy(&(ctx->enc_data[ctx->num]), in, inl);
150 i = ctx->length - ctx->num;
151 memcpy(&(ctx->enc_data[ctx->num]), in, i);
154 j = EVP_EncodeBlock(out, ctx->enc_data, ctx->length);
161 while (inl >= ctx->length && total <= INT_MAX) {
162 j = EVP_EncodeBlock(out, in, ctx->length);
170 if (total > INT_MAX) {
171 /* Too much output data! */
176 memcpy(&(ctx->enc_data[0]), in, inl);
181 void EVP_EncodeFinal(EVP_ENCODE_CTX *ctx, unsigned char *out, int *outl)
183 unsigned int ret = 0;
186 ret = EVP_EncodeBlock(out, ctx->enc_data, ctx->num);
194 int EVP_EncodeBlock(unsigned char *t, const unsigned char *f, int dlen)
199 for (i = dlen; i > 0; i -= 3) {
201 l = (((unsigned long)f[0]) << 16L) |
202 (((unsigned long)f[1]) << 8L) | f[2];
203 *(t++) = conv_bin2ascii(l >> 18L);
204 *(t++) = conv_bin2ascii(l >> 12L);
205 *(t++) = conv_bin2ascii(l >> 6L);
206 *(t++) = conv_bin2ascii(l);
208 l = ((unsigned long)f[0]) << 16L;
210 l |= ((unsigned long)f[1] << 8L);
212 *(t++) = conv_bin2ascii(l >> 18L);
213 *(t++) = conv_bin2ascii(l >> 12L);
214 *(t++) = (i == 1) ? '=' : conv_bin2ascii(l >> 6L);
225 void EVP_DecodeInit(EVP_ENCODE_CTX *ctx)
238 int EVP_DecodeUpdate(EVP_ENCODE_CTX *ctx, unsigned char *out, int *outl,
239 const unsigned char *in, int inl)
241 int seof = -1, eof = 0, rv = -1, ret = 0, i, v, tmp, n, ln, exp_nl;
247 exp_nl = ctx->expect_nl;
249 /* last line of input. */
250 if ((inl == 0) || ((n == 0) && (conv_ascii2bin(in[0]) == B64_EOF))) {
255 /* We parse the input data */
256 for (i = 0; i < inl; i++) {
257 /* If the current line is > 80 characters, scream alot */
263 /* Get char and put it into the buffer */
265 v = conv_ascii2bin(tmp);
266 /* only save the good data :-) */
267 if (!B64_NOT_BASE64(v)) {
268 OPENSSL_assert(n < (int)sizeof(ctx->enc_data));
271 } else if (v == B64_ERROR) {
277 * have we seen a '=' which is 'definitly' the last input line. seof
278 * will point to the character that holds it. and eof will hold how
279 * many characters to chop off.
304 * If we are at the end of input and it looks like a line, process
307 if (((i + 1) == inl) && (((n & 3) == 0) || eof)) {
310 * In case things were given us in really small records (so two
311 * '=' were given in separate updates), eof may contain the
312 * incorrect number of ending bytes to skip, so let's redo the
320 /* There will never be more than two '=' */
323 if ((v == B64_EOF && (n & 3) == 0) || (n >= 64)) {
325 * This is needed to work correctly on 64 byte input lines. We
326 * process the line and then need to accept the '\n'
328 if ((v != B64_EOF) && (n >= 64))
331 v = EVP_DecodeBlock(out, d, n);
348 * This is the case where we have had a short but valid input
351 if ((v < ctx->length) && eof) {
369 ctx->expect_nl = exp_nl;
373 int EVP_DecodeBlock(unsigned char *t, const unsigned char *f, int n)
375 int i, ret = 0, a, b, c, d;
378 /* trim white space from the start of the line. */
379 while ((conv_ascii2bin(*f) == B64_WS) && (n > 0)) {
385 * strip off stuff at the end of the line ascii2bin values B64_WS,
386 * B64_EOLN, B64_EOLN and B64_EOF
388 while ((n > 3) && (B64_NOT_BASE64(conv_ascii2bin(f[n - 1]))))
394 for (i = 0; i < n; i += 4) {
395 a = conv_ascii2bin(*(f++));
396 b = conv_ascii2bin(*(f++));
397 c = conv_ascii2bin(*(f++));
398 d = conv_ascii2bin(*(f++));
399 if ((a & 0x80) || (b & 0x80) || (c & 0x80) || (d & 0x80))
401 l = ((((unsigned long)a) << 18L) |
402 (((unsigned long)b) << 12L) |
403 (((unsigned long)c) << 6L) | (((unsigned long)d)));
404 *(t++) = (unsigned char)(l >> 16L) & 0xff;
405 *(t++) = (unsigned char)(l >> 8L) & 0xff;
406 *(t++) = (unsigned char)(l) & 0xff;
412 int EVP_DecodeFinal(EVP_ENCODE_CTX *ctx, unsigned char *out, int *outl)
418 i = EVP_DecodeBlock(out, ctx->enc_data, ctx->num);
429 int EVP_DecodeValid(unsigned char *buf, int len)
431 int i, num = 0, bad = 0;
435 while (conv_ascii2bin(*buf) == B64_WS) {
442 for (i = len; i >= 4; i -= 4) {
443 if ((conv_ascii2bin(buf[0]) >= 0x40) ||
444 (conv_ascii2bin(buf[1]) >= 0x40) ||
445 (conv_ascii2bin(buf[2]) >= 0x40) ||
446 (conv_ascii2bin(buf[3]) >= 0x40))
449 num += 1 + (buf[2] != '=') + (buf[3] != '=');
451 if ((i == 1) && (conv_ascii2bin(buf[0]) == B64_EOLN))
453 if ((i == 2) && (conv_ascii2bin(buf[0]) == B64_EOLN) &&
454 (conv_ascii2bin(buf[0]) == B64_EOLN))