diff options
Diffstat (limited to 'third_party/libsrtp/src/test/util.c')
| -rw-r--r-- | third_party/libsrtp/src/test/util.c | 212 |
1 files changed, 212 insertions, 0 deletions
diff --git a/third_party/libsrtp/src/test/util.c b/third_party/libsrtp/src/test/util.c new file mode 100644 index 0000000000..c0f7614903 --- /dev/null +++ b/third_party/libsrtp/src/test/util.c @@ -0,0 +1,212 @@ +/* + * util.c + * + * Utilities used by the test apps + * + * John A. Foley + * Cisco Systems, Inc. + */ +/* + * + * Copyright (c) 2014-2017, 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 "config.h" +#include "util.h" + +#include <string.h> +#include <stdint.h> + +/* include space for null terminator */ +static char bit_string[MAX_PRINT_STRING_LEN + 1]; + +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; + } + + 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] = { 0 }; + 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; +} |