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-rw-r--r--third_party/heimdal/lib/roken/base32.c315
1 files changed, 315 insertions, 0 deletions
diff --git a/third_party/heimdal/lib/roken/base32.c b/third_party/heimdal/lib/roken/base32.c
new file mode 100644
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+++ b/third_party/heimdal/lib/roken/base32.c
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+/*
+ * Copyright (c) 2020 Kungliga Tekniska Högskolan
+ * (Royal Institute of Technology, Stockholm, Sweden).
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ *
+ * 3. Neither the name of the Institute nor the names of its contributors
+ * may be used to endorse or promote products derived from this software
+ * without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#include <config.h>
+
+#include <errno.h>
+#include <stdlib.h>
+#include <string.h>
+#include <limits.h>
+#ifdef TEST
+#include <stdio.h>
+#include <getarg.h>
+#include <err.h>
+#endif
+#include "base32.h"
+#include "roken.h"
+
+static const unsigned char base32_chars[] = "ABCDEFGHIJKLMNOPQRSTUVWXYZ234567";
+static const unsigned char base32op_chars[] = "0123456789ABCDEFGHIJKLMNOPQRSTUV";
+
+ROKEN_LIB_FUNCTION int ROKEN_LIB_CALL
+rk_base32_encode(const void *data, int size, char **str, enum rk_base32_flags flags)
+{
+ const unsigned char *chars =
+ (flags & RK_BASE32_FLAG_PRESERVE_ORDER) ? base32op_chars :
+ base32_chars;
+ uint64_t c;
+ char *s, *p;
+ int i;
+ const unsigned char *q;
+
+ if (size > INT_MAX/8 || size < 0) {
+ *str = NULL;
+ errno = ERANGE;
+ return -1;
+ }
+
+ p = s = malloc(((size + 5 - 1) / 5) * 8 + 1);
+ if (p == NULL) {
+ *str = NULL;
+ return -1;
+ }
+ q = (const unsigned char *) data;
+
+ for (i = 0; i < size;) {
+ /* 5 bytes of input will give us 8 output bytes' worth of bits */
+ c = q[i++];
+ c <<= 8;
+ if (i < size)
+ c += q[i];
+ i++;
+ c <<= 8;
+ if (i < size)
+ c += q[i];
+ i++;
+ c <<= 8;
+ if (i < size)
+ c += q[i];
+ i++;
+ c <<= 8;
+ if (i < size)
+ c += q[i];
+ i++;
+ p[0] = chars[(c & 0x00000000f800000000ULL) >> 35];
+ p[1] = chars[(c & 0x0000000007c0000000ULL) >> 30];
+ p[2] = chars[(c & 0x00000000003e000000ULL) >> 25];
+ p[3] = chars[(c & 0x000000000001f00000ULL) >> 20];
+ p[4] = chars[(c & 0x0000000000000f8000ULL) >> 15];
+ p[5] = chars[(c & 0x000000000000007c00ULL) >> 10];
+ p[6] = chars[(c & 0x0000000000000003e0ULL) >> 5];
+ p[7] = chars[(c & 0x00000000000000001fULL) >> 0];
+ switch (i - size) {
+ case 4: p[2] = p[3] = '='; /*fallthrough*/
+ case 3: p[4] = '='; /*fallthrough*/
+ case 2: p[5] = p[6] = '='; /*fallthrough*/
+ case 1: p[7] = '='; /*fallthrough*/
+ default: break;
+ }
+ p += 8;
+ }
+ *p = 0;
+ *str = s;
+ return (int) strlen(s);
+}
+
+#define DECODE_ERROR ((uint64_t)-1)
+
+static int
+pos(char c, int preserve_order)
+{
+ /* EBCDIC need not apply */
+ if (preserve_order) {
+ if (c >= '0' && c <= '9')
+ return c - '0';
+ if (c >= 'A' && c <= 'V')
+ return c - 'A' + ('9' - '0') + 1;
+ } else {
+ if (c >= 'A' && c <= 'Z')
+ return c - 'A';
+ if (c >= '2' && c <= '7')
+ return c - '2' + ('Z' - 'A') + 1;
+ }
+ return -1;
+}
+
+static uint64_t
+token_decode(const char *token, enum rk_base32_flags flags)
+{
+ uint64_t marker = 0;
+ uint64_t val = 0;
+ int preserve_order = !!(flags & RK_BASE32_FLAG_PRESERVE_ORDER);
+ int i, c;
+
+ if (strlen(token) < 8)
+ return DECODE_ERROR;
+ for (i = 0; i < 8; i++) {
+ val <<= 5;
+ if (token[i] == '=')
+ marker++;
+ else if (marker)
+ return DECODE_ERROR;
+ else if ((c = pos(token[i], preserve_order)) == -1 &&
+ (flags & RK_BASE32_FLAG_STOP_ON_GARBAGE))
+ break;
+ else if (c == -1)
+ return DECODE_ERROR;
+ else
+ val |= c;
+ }
+ if (marker > 6)
+ return DECODE_ERROR;
+ return (marker << 40) | val;
+}
+
+ROKEN_LIB_FUNCTION int ROKEN_LIB_CALL
+rk_base32_decode(const char *str, void *data, enum rk_base32_flags flags)
+{
+ const char *p;
+ unsigned char *q;
+ int preserve_order = !!(flags & RK_BASE32_FLAG_PRESERVE_ORDER);
+
+ q = data;
+ for (p = str; *p && (*p == '=' || pos(*p, preserve_order) != -1); p += 8) {
+ uint64_t val = token_decode(p, flags);
+ uint64_t marker = (val >> 40) & 0xffULL;
+
+ if (val == DECODE_ERROR) {
+ errno = EINVAL;
+ return -1;
+ }
+ *q++ = (val >> 32) & 0xffULL;
+ if (marker < 6)
+ *q++ = (val >> 24) & 0xffULL;
+ if (marker < 4)
+ *q++ = (val >> 16) & 0xffULL;
+ if (marker < 3)
+ *q++ = (val >> 8) & 0xffULL;
+ if (marker < 1)
+ *q++ = val & 0xffULL;
+ if (marker && !(flags & RK_BASE32_FLAG_INTERIOR_PADDING_OK))
+ break;
+ }
+ if (q - (unsigned char *) data > INT_MAX) {
+ errno = EOVERFLOW;
+ return -1;
+ }
+ return q - (unsigned char *) data;
+}
+
+#ifdef TEST
+static int interior_padding_ok;
+static int preserve_order_flag;
+static int stop_on_garbage;
+static int decode_flag;
+static int help_flag;
+
+/*
+ * The short options are compatible with a subset of the FreeBSD contrib
+ * vis(1). Heimdal additions have long option names only.
+ */
+static struct getargs args[] = {
+ { "preserve-order", 'P', arg_flag, &preserve_order_flag,
+ "Use order-preserving alphabet", NULL },
+ { "interior-padding-ok", 'O', arg_flag, &interior_padding_ok,
+ "Decode concatenated padded base32 strings as one", NULL },
+ { "stop-on-garbage", 'G', arg_flag, &stop_on_garbage,
+ "Do not error on garbage", NULL },
+ { "decode", 'd', arg_flag, &decode_flag, "Decode", NULL },
+ { "help", 'h', arg_flag, &help_flag, "Print help message", NULL },
+};
+static size_t num_args = sizeof(args)/sizeof(args[0]);
+
+int
+main(int argc, char **argv)
+{
+ enum rk_base32_flags flags = 0;
+ unsigned char *buf = NULL;
+ size_t buflen = 0;
+ size_t bufsz = 0;
+ int goptind = 0;
+ int ret;
+
+ setprogname("rkbase32");
+ if (getarg(args, num_args, argc, argv, &goptind) || help_flag) {
+ arg_printusage(args, num_args, NULL, "FILE | -");
+ return help_flag ? 0 : 1;
+ }
+
+ argc -= goptind;
+ argv += goptind;
+
+ flags |= preserve_order_flag ? RK_BASE32_FLAG_PRESERVE_ORDER : 0;
+ flags |= interior_padding_ok ? RK_BASE32_FLAG_INTERIOR_PADDING_OK : 0;
+ flags |= stop_on_garbage ? RK_BASE32_FLAG_STOP_ON_GARBAGE : 0;
+
+ if (help_flag)
+ return arg_printusage(args, num_args, NULL, "FILE | -- -"), 0;
+ if (argc != 1)
+ return arg_printusage(args, num_args, NULL, "FILE | -- -"), 1;
+
+ if (strcmp(argv[0], "-") == 0) {
+ unsigned char *tmp;
+ unsigned char d[4096];
+ size_t bytes;
+
+ while (!feof(stdin) && !ferror(stdin)) {
+ bytes = fread(d, 1, sizeof(d), stdin);
+ if (bytes == 0)
+ continue;
+ if (buflen + bytes > bufsz) {
+ if ((tmp = realloc(buf, bufsz + (bufsz >> 2) + sizeof(d))) == NULL)
+ err(1, "Could not read stdin");
+ buf = tmp;
+ bufsz = bufsz + (bufsz >> 2) + sizeof(d);
+ }
+ memcpy(buf + buflen, d, bytes);
+ buflen += bytes;
+ }
+ if (ferror(stdin))
+ err(1, "Could not read stdin");
+ } else {
+ void *d;
+
+ if ((ret = rk_undumpdata(argv[0], &d, &bufsz)))
+ err(1, "Could not read %s", argv[0]);
+ buflen = bufsz;
+ buf = d;
+ }
+
+ if (decode_flag) {
+ unsigned char *d;
+
+ if (buflen == bufsz) {
+ unsigned char *tmp;
+
+ if ((tmp = realloc(buf, bufsz + 1)) == NULL)
+ err(1, "Could not decode data");
+ buf = tmp;
+ bufsz++;
+ }
+ buf[buflen] = '\0';
+
+ if ((d = malloc(buflen * 5 / 8 + 4)) == NULL)
+ err(1, "Could not decode data");
+
+ if ((ret = rk_base32_decode((const char *)buf, d, flags)) < 0)
+ err(1, "Could not decode data");
+ if (fwrite(d, ret, 1, stdout) != 1)
+ err(1, "Could not write decoded data");
+ free(d);
+ } else {
+ char *e;
+
+ if ((ret = rk_base32_encode(buf, buflen, &e, flags)) < 0)
+ err(1, "Could not encode data");
+ if (fwrite(e, ret, 1, stdout) != 1)
+ err(1, "Could not write decoded data");
+ free(e);
+ if (fwrite("\n", 1, 1, stdout) != 1)
+ err(1, "Could not write decoded data");
+ }
+ free(buf);
+ return 0;
+}
+#endif
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