Adding testing CLI client (based off the Heimdal testing sample)

[mod_auth_kerb.git] / client / base64.c

diff --git a/client/base64.c b/client/base64.c
new file mode 100644 (file)
index 0000000..37c22b9
--- /dev/null
+++ b/client/base64.c
@@ -0,0 +1,144 @@
+/*
+ * Copyright (c) 1995-2001 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.
+ */
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+
+#include <stdlib.h>
+#include <string.h>
+#include <limits.h>
+#include "base64.h"
+
+static const char base64_chars[] =
+    "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
+
+static int
+pos(char c)
+{
+    const char *p;
+    for (p = base64_chars; *p; p++)
+       if (*p == c)
+           return p - base64_chars;
+    return -1;
+}
+
+ROKEN_LIB_FUNCTION int ROKEN_LIB_CALL
+base64_encode(const void *data, int size, char **str)
+{
+    char *s, *p;
+    int i;
+    int c;
+    const unsigned char *q;
+
+    if (size > INT_MAX/4 || size < 0) {
+       *str = NULL;
+       return -1;
+    }
+
+    p = s = (char *) malloc(size * 4 / 3 + 4);
+    if (p == NULL) {
+        *str = NULL;
+       return -1;
+    }
+    q = (const unsigned char *) data;
+
+    for (i = 0; i < size;) {
+       c = q[i++];
+       c *= 256;
+       if (i < size)
+           c += q[i];
+       i++;
+       c *= 256;
+       if (i < size)
+           c += q[i];
+       i++;
+       p[0] = base64_chars[(c & 0x00fc0000) >> 18];
+       p[1] = base64_chars[(c & 0x0003f000) >> 12];
+       p[2] = base64_chars[(c & 0x00000fc0) >> 6];
+       p[3] = base64_chars[(c & 0x0000003f) >> 0];
+       if (i > size)
+           p[3] = '=';
+       if (i > size + 1)
+           p[2] = '=';
+       p += 4;
+    }
+    *p = 0;
+    *str = s;
+    return (int) strlen(s);
+}
+
+#define DECODE_ERROR 0xffffffff
+
+static unsigned int
+token_decode(const char *token)
+{
+    int i;
+    unsigned int val = 0;
+    int marker = 0;
+    if (strlen(token) < 4)
+       return DECODE_ERROR;
+    for (i = 0; i < 4; i++) {
+       val *= 64;
+       if (token[i] == '=')
+           marker++;
+       else if (marker > 0)
+           return DECODE_ERROR;
+       else
+           val += pos(token[i]);
+    }
+    if (marker > 2)
+       return DECODE_ERROR;
+    return (marker << 24) | val;
+}
+
+ROKEN_LIB_FUNCTION int ROKEN_LIB_CALL
+base64_decode(const char *str, void *data)
+{
+    const char *p;
+    unsigned char *q;
+
+    q = data;
+    for (p = str; *p && (*p == '=' || strchr(base64_chars, *p)); p += 4) {
+       unsigned int val = token_decode(p);
+       unsigned int marker = (val >> 24) & 0xff;
+       if (val == DECODE_ERROR)
+           return -1;
+       *q++ = (val >> 16) & 0xff;
+       if (marker < 2)
+           *q++ = (val >> 8) & 0xff;
+       if (marker < 1)
+           *q++ = val & 0xff;
+    }
+    return q - (unsigned char *) data;
+}