Update libsrtp to version 2.0

test/util.c

+/*
+ * util.c
+ *
+ * Utilities used by the test apps
+ *
+ * John A. Foley
+ * Cisco Systems, Inc.
+ */
+/*
+ *
+ * Copyright (c) 2014, Cisco Systems, Inc.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ *   Redistributions of source code must retain the above copyright
+ *   notice, this list of conditions and the following disclaimer.
+ *
+ *   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.
+ *
+ *   Neither the name of the Cisco Systems, Inc. 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 COPYRIGHT HOLDERS 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
+ * COPYRIGHT HOLDERS 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 <string.h>
+#include <stdint.h>
+#include "util.h"
+
+char bit_string[MAX_PRINT_STRING_LEN];
+
+static inline int hex_char_to_nibble (uint8_t c)
+{
+    switch (c) {
+    case ('0'): return 0x0;
+    case ('1'): return 0x1;
+    case ('2'): return 0x2;
+    case ('3'): return 0x3;
+    case ('4'): return 0x4;
+    case ('5'): return 0x5;
+    case ('6'): return 0x6;
+    case ('7'): return 0x7;
+    case ('8'): return 0x8;
+    case ('9'): return 0x9;
+    case ('a'): return 0xa;
+    case ('A'): return 0xa;
+    case ('b'): return 0xb;
+    case ('B'): return 0xb;
+    case ('c'): return 0xc;
+    case ('C'): return 0xc;
+    case ('d'): return 0xd;
+    case ('D'): return 0xd;
+    case ('e'): return 0xe;
+    case ('E'): return 0xe;
+    case ('f'): return 0xf;
+    case ('F'): return 0xf;
+    default: return -1; /* this flags an error */
+    }
+    /* NOTREACHED */
+    return -1; /* this keeps compilers from complaining */
+}
+
+uint8_t nibble_to_hex_char (uint8_t nibble)
+{
+    char buf[16] = { '0', '1', '2', '3', '4', '5', '6', '7',
+                     '8', '9', 'a', 'b', 'c', 'd', 'e', 'f' };
+
+    return buf[nibble & 0xF];
+}
+
+/*
+ * hex_string_to_octet_string converts a hexadecimal string
+ * of length 2 * len to a raw octet string of length len
+ */
+int hex_string_to_octet_string (char *raw, char *hex, int len)
+{
+    uint8_t x;
+    int tmp;
+    int hex_len;
+
+    hex_len = 0;
+    while (hex_len < len) {
+        tmp = hex_char_to_nibble(hex[0]);
+        if (tmp == -1) {
+            return hex_len;
+        }
+        x = (tmp << 4);
+        hex_len++;
+        tmp = hex_char_to_nibble(hex[1]);
+        if (tmp == -1) {
+            return hex_len;
+        }
+        x |= (tmp & 0xff);
+        hex_len++;
+        *raw++ = x;
+        hex += 2;
+    }
+    return hex_len;
+}
+
+char * octet_string_hex_string (const void *s, int length)
+{
+    const uint8_t *str = (const uint8_t*)s;
+    int i;
+
+    /* double length, since one octet takes two hex characters */
+    length *= 2;
+
+    /* truncate string if it would be too long */
+    if (length > MAX_PRINT_STRING_LEN) {
+        length = MAX_PRINT_STRING_LEN - 1;
+    }
+
+    for (i = 0; i < length; i += 2) {
+        bit_string[i]   = nibble_to_hex_char(*str >> 4);
+        bit_string[i + 1] = nibble_to_hex_char(*str++ & 0xF);
+    }
+    bit_string[i] = 0; /* null terminate string */
+    return bit_string;
+}
+
+static const char b64chars[] = "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
+                               "abcdefghijklmnopqrstuvwxyz0123456789+/";
+
+static int base64_block_to_octet_triple (char *out, char *in)
+{
+    unsigned char sextets[4] = {};
+    int j = 0;
+    int i;
+
+    for (i = 0; i < 4; i++) {
+        char *p = strchr(b64chars, in[i]);
+        if (p != NULL) {
+            sextets[i] = p - b64chars;
+        } else{  j++; }
+    }
+
+    out[0] = (sextets[0] << 2) | (sextets[1] >> 4);
+    if (j < 2) {
+        out[1] = (sextets[1] << 4) | (sextets[2] >> 2);
+    }
+    if (j < 1) {
+        out[2] = (sextets[2] << 6) | sextets[3];
+    }
+    return j;
+}
+
+int base64_string_to_octet_string (char *out, int *pad, char *in, int len)
+{
+    int k = 0;
+    int i = 0;
+    int j = 0;
+
+    if (len % 4 != 0) {
+        return 0;
+    }
+
+    while (i < len && j == 0) {
+        j = base64_block_to_octet_triple(out + k, in + i);
+        k += 3;
+        i += 4;
+    }
+    *pad = j;
+    return i;
+}
+