chromium/third_party/libsrtp/crypto/math/datatypes.c

/*
 * datatypes.c
 *
 * data types for finite fields and functions for input, output, and
 * manipulation
 *
 * David A. McGrew
 * Cisco Systems, Inc.
 */
/*
 *
 * Copyright (c) 2001-2017 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.
 *
 */

#ifdef HAVE_CONFIG_H
#include <config.h>
#endif

#ifdef OPENSSL
#include <openssl/crypto.h>
#endif

#include "datatypes.h"

static const int8_t octet_weight[256] = …;

int octet_get_weight(uint8_t octet)
{ … }

/*
 * bit_string is a buffer that is used to hold output strings, e.g.
 * for printing.
 */

/* the value MAX_PRINT_STRING_LEN is defined in datatypes.h */
/* include space for null terminator */
static char bit_string[MAX_PRINT_STRING_LEN + 1];

uint8_t srtp_nibble_to_hex_char(uint8_t nibble)
{ … }

char *srtp_octet_string_hex_string(const void *s, int length)
{ … }

char *v128_hex_string(v128_t *x)
{ … }

char *v128_bit_string(v128_t *x)
{ … }

void v128_copy_octet_string(v128_t *x, const uint8_t s[16])
{ … }

#ifndef DATATYPES_USE_MACROS /* little functions are not macros */

void v128_set_to_zero(v128_t *x)
{
    _v128_set_to_zero(x);
}

void v128_copy(v128_t *x, const v128_t *y)
{
    _v128_copy(x, y);
}

void v128_xor(v128_t *z, v128_t *x, v128_t *y)
{
    _v128_xor(z, x, y);
}

void v128_and(v128_t *z, v128_t *x, v128_t *y)
{
    _v128_and(z, x, y);
}

void v128_or(v128_t *z, v128_t *x, v128_t *y)
{
    _v128_or(z, x, y);
}

void v128_complement(v128_t *x)
{
    _v128_complement(x);
}

int v128_is_eq(const v128_t *x, const v128_t *y)
{
    return _v128_is_eq(x, y);
}

int v128_xor_eq(v128_t *x, const v128_t *y)
{
    return _v128_xor_eq(x, y);
}

int v128_get_bit(const v128_t *x, int i)
{
    return _v128_get_bit(x, i);
}

void v128_set_bit(v128_t *x, int i)
{
    _v128_set_bit(x, i);
}

void v128_clear_bit(v128_t *x, int i)
{
    _v128_clear_bit(x, i);
}

void v128_set_bit_to(v128_t *x, int i, int y)
{
    _v128_set_bit_to(x, i, y);
}

#endif /* DATATYPES_USE_MACROS */

void v128_right_shift(v128_t *x, int shift)
{ … }

void v128_left_shift(v128_t *x, int shift)
{ … }

/* functions manipulating bitvector_t */

#ifndef DATATYPES_USE_MACROS /* little functions are not macros */

int bitvector_get_bit(const bitvector_t *v, int bit_index)
{
    return _bitvector_get_bit(v, bit_index);
}

void bitvector_set_bit(bitvector_t *v, int bit_index)
{
    _bitvector_set_bit(v, bit_index);
}

void bitvector_clear_bit(bitvector_t *v, int bit_index)
{
    _bitvector_clear_bit(v, bit_index);
}

#endif /* DATATYPES_USE_MACROS */

int bitvector_alloc(bitvector_t *v, unsigned long length)
{ … }

void bitvector_dealloc(bitvector_t *v)
{ … }

void bitvector_set_to_zero(bitvector_t *x)
{ … }

char *bitvector_bit_string(bitvector_t *x, char *buf, int len)
{ … }

void bitvector_left_shift(bitvector_t *x, int shift)
{ … }

int srtp_octet_string_is_eq(uint8_t *a, uint8_t *b, int len)
{ … }

void srtp_cleanse(void *s, size_t len)
{ … }

void octet_string_set_to_zero(void *s, size_t len)
{ … }

#ifdef TESTAPP_SOURCE

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;
}

#endif