Update libsrtp to version 2.0

srtp/crypto/math/math.c

-/*
- * math.c
- *
- * crypto math operations and data types
- *
- * David A. McGrew
- * Cisco Systems, Inc.
- */
-/*
- *      
- * Copyright (c) 2001-2006 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
-
-#include "crypto_math.h"
-
-int 
-octet_weight[256] = {
-  0, 1, 1, 2, 1, 2, 2, 3,
-  1, 2, 2, 3, 2, 3, 3, 4,
-  1, 2, 2, 3, 2, 3, 3, 4,
-  2, 3, 3, 4, 3, 4, 4, 5,
-  1, 2, 2, 3, 2, 3, 3, 4,
-  2, 3, 3, 4, 3, 4, 4, 5,
-  2, 3, 3, 4, 3, 4, 4, 5,
-  3, 4, 4, 5, 4, 5, 5, 6,
-  1, 2, 2, 3, 2, 3, 3, 4,
-  2, 3, 3, 4, 3, 4, 4, 5,
-  2, 3, 3, 4, 3, 4, 4, 5,
-  3, 4, 4, 5, 4, 5, 5, 6,
-  2, 3, 3, 4, 3, 4, 4, 5,
-  3, 4, 4, 5, 4, 5, 5, 6,
-  3, 4, 4, 5, 4, 5, 5, 6,
-  4, 5, 5, 6, 5, 6, 6, 7,
-  1, 2, 2, 3, 2, 3, 3, 4,
-  2, 3, 3, 4, 3, 4, 4, 5,
-  2, 3, 3, 4, 3, 4, 4, 5,
-  3, 4, 4, 5, 4, 5, 5, 6,
-  2, 3, 3, 4, 3, 4, 4, 5,
-  3, 4, 4, 5, 4, 5, 5, 6,
-  3, 4, 4, 5, 4, 5, 5, 6,
-  4, 5, 5, 6, 5, 6, 6, 7,
-  2, 3, 3, 4, 3, 4, 4, 5,
-  3, 4, 4, 5, 4, 5, 5, 6,
-  3, 4, 4, 5, 4, 5, 5, 6,
-  4, 5, 5, 6, 5, 6, 6, 7,
-  3, 4, 4, 5, 4, 5, 5, 6,
-  4, 5, 5, 6, 5, 6, 6, 7,
-  4, 5, 5, 6, 5, 6, 6, 7,
-  5, 6, 6, 7, 6, 7, 7, 8
-};
-
-int
-low_bit[256] = {
-  -1, 0, 1, 0, 2, 0, 1, 0,
-  3, 0, 1, 0, 2, 0, 1, 0,
-  4, 0, 1, 0, 2, 0, 1, 0,
-  3, 0, 1, 0, 2, 0, 1, 0,
-  5, 0, 1, 0, 2, 0, 1, 0,
-  3, 0, 1, 0, 2, 0, 1, 0,
-  4, 0, 1, 0, 2, 0, 1, 0,
-  3, 0, 1, 0, 2, 0, 1, 0,
-  6, 0, 1, 0, 2, 0, 1, 0,
-  3, 0, 1, 0, 2, 0, 1, 0,
-  4, 0, 1, 0, 2, 0, 1, 0,
-  3, 0, 1, 0, 2, 0, 1, 0,
-  5, 0, 1, 0, 2, 0, 1, 0,
-  3, 0, 1, 0, 2, 0, 1, 0,
-  4, 0, 1, 0, 2, 0, 1, 0,
-  3, 0, 1, 0, 2, 0, 1, 0,
-  7, 0, 1, 0, 2, 0, 1, 0,
-  3, 0, 1, 0, 2, 0, 1, 0,
-  4, 0, 1, 0, 2, 0, 1, 0,
-  3, 0, 1, 0, 2, 0, 1, 0,
-  5, 0, 1, 0, 2, 0, 1, 0,
-  3, 0, 1, 0, 2, 0, 1, 0,
-  4, 0, 1, 0, 2, 0, 1, 0,
-  3, 0, 1, 0, 2, 0, 1, 0,
-  6, 0, 1, 0, 2, 0, 1, 0,
-  3, 0, 1, 0, 2, 0, 1, 0,
-  4, 0, 1, 0, 2, 0, 1, 0,
-  3, 0, 1, 0, 2, 0, 1, 0,
-  5, 0, 1, 0, 2, 0, 1, 0,
-  3, 0, 1, 0, 2, 0, 1, 0,
-  4, 0, 1, 0, 2, 0, 1, 0,
-  3, 0, 1, 0, 2, 0, 1, 0
-};
-
-
-int
-high_bit[256] = {
-  -1, 0, 1, 1, 2, 2, 2, 2,
-  3, 3, 3, 3, 3, 3, 3, 3,
-  4, 4, 4, 4, 4, 4, 4, 4,
-  4, 4, 4, 4, 4, 4, 4, 4,
-  5, 5, 5, 5, 5, 5, 5, 5,
-  5, 5, 5, 5, 5, 5, 5, 5,
-  5, 5, 5, 5, 5, 5, 5, 5,
-  5, 5, 5, 5, 5, 5, 5, 5,
-  6, 6, 6, 6, 6, 6, 6, 6,
-  6, 6, 6, 6, 6, 6, 6, 6,
-  6, 6, 6, 6, 6, 6, 6, 6,
-  6, 6, 6, 6, 6, 6, 6, 6,
-  6, 6, 6, 6, 6, 6, 6, 6,
-  6, 6, 6, 6, 6, 6, 6, 6,
-  6, 6, 6, 6, 6, 6, 6, 6,
-  6, 6, 6, 6, 6, 6, 6, 6,
-  7, 7, 7, 7, 7, 7, 7, 7,
-  7, 7, 7, 7, 7, 7, 7, 7,
-  7, 7, 7, 7, 7, 7, 7, 7,
-  7, 7, 7, 7, 7, 7, 7, 7,
-  7, 7, 7, 7, 7, 7, 7, 7,
-  7, 7, 7, 7, 7, 7, 7, 7,
-  7, 7, 7, 7, 7, 7, 7, 7,
-  7, 7, 7, 7, 7, 7, 7, 7,
-  7, 7, 7, 7, 7, 7, 7, 7,
-  7, 7, 7, 7, 7, 7, 7, 7,
-  7, 7, 7, 7, 7, 7, 7, 7,
-  7, 7, 7, 7, 7, 7, 7, 7,
-  7, 7, 7, 7, 7, 7, 7, 7,
-  7, 7, 7, 7, 7, 7, 7, 7,
-  7, 7, 7, 7, 7, 7, 7, 7,
-  7, 7, 7, 7, 7, 7, 7, 7
-};
-
-int
-octet_get_weight(uint8_t octet) {
-  extern int octet_weight[256];
-
-  return octet_weight[octet];
-}  
-
-unsigned char
-v32_weight(v32_t a) {
-  unsigned int wt = 0;
-  
-  wt += octet_weight[a.v8[0]];  /* note: endian-ness makes no difference */
-  wt += octet_weight[a.v8[1]];
-  wt += octet_weight[a.v8[2]];
-  wt += octet_weight[a.v8[3]];
-  
-  return wt;
-}
-
-unsigned char
-v32_distance(v32_t x, v32_t y) {
-  x.value ^= y.value;
-  return v32_weight(x);
-}
-
-unsigned int
-v32_dot_product(v32_t a, v32_t b) {
-  a.value &= b.value;
-  return v32_weight(a) & 1;
-}
-
-/*
- * _bit_string returns a NULL-terminated character string suitable for
- * printing
- */
-
-#define MAX_STRING_LENGTH 1024
-
-char bit_string[MAX_STRING_LENGTH];
-
-char *
-octet_bit_string(uint8_t x) {
-  int mask, index;
-
-  for (mask = 1, index = 0; mask < 256; mask <<= 1)
-    if ((x & mask) == 0)
-      bit_string[index++] = '0';
-    else
-      bit_string[index++] = '1';
-
-  bit_string[index++] = 0;  /* NULL terminate string */
-
-  return bit_string;
-}
-
-char *
-v16_bit_string(v16_t x) {
-  int i, mask, index;
-
-  for (i = index = 0; i < 2; i++) {
-    for (mask = 1; mask < 256; mask <<= 1)
-      if ((x.v8[i] & mask) == 0)
-        bit_string[index++] = '0';
-      else
-        bit_string[index++] = '1';
-  }
-  bit_string[index++] = 0;  /* NULL terminate string */
-  return bit_string;
-}
-
-char *
-v32_bit_string(v32_t x) {
-  int i, mask, index;
-
-  for (i = index = 0; i < 4; i++) {
-    for (mask = 128; mask > 0; mask >>= 1)
-      if ((x.v8[i] & mask) == 0)
-        bit_string[index++] = '0';
-      else
-        bit_string[index++] = '1';
-  }
-  bit_string[index++] = 0;  /* NULL terminate string */
-  return bit_string;
-}
-
-char *
-v64_bit_string(const v64_t *x) {
-  int i, mask, index;
-
-  for (i = index = 0; i < 8; i++) {
-    for (mask = 1; mask < 256; mask <<= 1)
-      if ((x->v8[i] & mask) == 0)
-        bit_string[index++] = '0';
-      else
-        bit_string[index++] = '1';
-  }
-  bit_string[index++] = 0;  /* NULL terminate string */
-  return bit_string;
-}
-
-char *
-v128_bit_string(v128_t *x) {
-  int j, index;
-  uint32_t mask;
-  
-  for (j=index=0; j < 4; j++) {
-    for (mask=0x80000000; mask > 0; mask >>= 1) {
-      if (x->v32[j] & mask)
-        bit_string[index] = '1';
-      else
-        bit_string[index] = '0';
-      ++index;
-    }
-  }
-  bit_string[128] = 0; /* null terminate string */
-
-  return bit_string;
-}
-
-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];
-}
-
-char *
-octet_hex_string(uint8_t x) {
-
-  bit_string[0]  = nibble_to_hex_char(x >> 4);
-  bit_string[1]  = nibble_to_hex_char(x & 0xF);
-  
-  bit_string[2] = 0; /* null terminate string */
-  return bit_string;
-}
-
-char *
-octet_string_hex_string(const void *str, int length) {
-  const uint8_t *s = str;
-  int i;
-  
-  /* double length, since one octet takes two hex characters */
-  length *= 2;
-
-  /* truncate string if it would be too long */
-  if (length > MAX_STRING_LENGTH)
-    length = MAX_STRING_LENGTH-1;
-  
-  for (i=0; i < length; i+=2) {
-    bit_string[i]   = nibble_to_hex_char(*s >> 4);
-    bit_string[i+1] = nibble_to_hex_char(*s++ & 0xF);
-  }
-  bit_string[i] = 0; /* null terminate string */
-  return bit_string;
-}
-
-char *
-v16_hex_string(v16_t x) {
-  int i, j;
-
-  for (i=j=0; i < 2; i++) {
-    bit_string[j++]  = nibble_to_hex_char(x.v8[i] >> 4);
-    bit_string[j++]  = nibble_to_hex_char(x.v8[i] & 0xF);
-  }
-  
-  bit_string[j] = 0; /* null terminate string */
-  return bit_string;
-}
-
-char *
-v32_hex_string(v32_t x) {
-  int i, j;
-
-  for (i=j=0; i < 4; i++) {
-    bit_string[j++]  = nibble_to_hex_char(x.v8[i] >> 4);
-    bit_string[j++]  = nibble_to_hex_char(x.v8[i] & 0xF);
-  }
-  
-  bit_string[j] = 0; /* null terminate string */
-  return bit_string;
-}
-
-char *
-v64_hex_string(const v64_t *x) {
-  int i, j;
-
-  for (i=j=0; i < 8; i++) {
-    bit_string[j++]  = nibble_to_hex_char(x->v8[i] >> 4);
-    bit_string[j++]  = nibble_to_hex_char(x->v8[i] & 0xF);
-  }
-  
-  bit_string[j] = 0; /* null terminate string */
-  return bit_string;
-}
-
-char *
-v128_hex_string(v128_t *x) {
-  int i, j;
-
-  for (i=j=0; i < 16; i++) {
-    bit_string[j++]  = nibble_to_hex_char(x->v8[i] >> 4);
-    bit_string[j++]  = nibble_to_hex_char(x->v8[i] & 0xF);
-  }
-  
-  bit_string[j] = 0; /* null terminate string */
-  return bit_string;
-}
-
-char *
-char_to_hex_string(char *x, int num_char) {
-  int i, j;
-
-  if (num_char >= 16)
-    num_char = 16;
-  for (i=j=0; i < num_char; i++) {
-    bit_string[j++]  = nibble_to_hex_char(x[i] >> 4);
-    bit_string[j++]  = nibble_to_hex_char(x[i] & 0xF);
-  }
-  
-  bit_string[j] = 0; /* null terminate string */
-  return bit_string;
-}
-
-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 */
-}
-
-int
-is_hex_string(char *s) {
-  while(*s != 0)
-    if (hex_char_to_nibble(*s++) == -1)
-      return 0;
-  return 1;
-}
-
-uint8_t
-hex_string_to_octet(char *s) {
-  uint8_t x;
-
-  x = (hex_char_to_nibble(s[0]) << 4)
-    | hex_char_to_nibble(s[1] & 0xFF);
-  
-  return x;
-}
-
-/*
- * 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;
-}
-
-v16_t
-hex_string_to_v16(char *s) {
-  v16_t x;
-  int i, j;
-
-  for (i=j=0; i < 4; i += 2, j++) {
-    x.v8[j] = (hex_char_to_nibble(s[i]) << 4)
-      | hex_char_to_nibble(s[i+1] & 0xFF);
-  }
-  return x;
-}
-
-v32_t
-hex_string_to_v32(char *s) {
-  v32_t x;
-  int i, j;
-
-  for (i=j=0; i < 8; i += 2, j++) {
-    x.v8[j] = (hex_char_to_nibble(s[i]) << 4)
-      | hex_char_to_nibble(s[i+1] & 0xFF);
-  }
-  return x;
-}
-
-v64_t
-hex_string_to_v64(char *s) {
-  v64_t x;
-  int i, j;
-
-  for (i=j=0; i < 16; i += 2, j++) {
-    x.v8[j] = (hex_char_to_nibble(s[i]) << 4)
-      | hex_char_to_nibble(s[i+1] & 0xFF);
-  }
-  return x;
-}
-
-v128_t
-hex_string_to_v128(char *s) {
-  v128_t x;
-  int i, j;
-
-  for (i=j=0; i < 32; i += 2, j++) {
-    x.v8[j] = (hex_char_to_nibble(s[i]) << 4)
-      | hex_char_to_nibble(s[i+1] & 0xFF);
-  }
-  return x;
-}
-
-
-
-/* 
- * the matrix A[] is stored in column format, i.e., A[i] is the ith
- * column of the matrix 
- */
-
-uint8_t 
-A_times_x_plus_b(uint8_t A[8], uint8_t x, uint8_t b) {
-  int index = 0;
-  unsigned mask;
-  
-  for (mask=1; mask < 256; mask *= 2) {
-    if (x & mask)
-      b^= A[index];
-    ++index;
-  }
-
-  return b;
-}
-
-void
-v16_copy_octet_string(v16_t *x, const uint8_t s[2]) {
-  x->v8[0]  = s[0];
-  x->v8[1]  = s[1];
-}
-
-void
-v32_copy_octet_string(v32_t *x, const uint8_t s[4]) {
-  x->v8[0]  = s[0];
-  x->v8[1]  = s[1];
-  x->v8[2]  = s[2];
-  x->v8[3]  = s[3];
-}
-
-void
-v64_copy_octet_string(v64_t *x, const uint8_t s[8]) {
-  x->v8[0]  = s[0];
-  x->v8[1]  = s[1];
-  x->v8[2]  = s[2];
-  x->v8[3]  = s[3];
-  x->v8[4]  = s[4];
-  x->v8[5]  = s[5];
-  x->v8[6]  = s[6];
-  x->v8[7]  = s[7];
-}
-
-void
-v128_copy_octet_string(v128_t *x, const uint8_t s[16]) {
-  x->v8[0]  = s[0];
-  x->v8[1]  = s[1];
-  x->v8[2]  = s[2];
-  x->v8[3]  = s[3];
-  x->v8[4]  = s[4];
-  x->v8[5]  = s[5];
-  x->v8[6]  = s[6];
-  x->v8[7]  = s[7];
-  x->v8[8]  = s[8];
-  x->v8[9]  = s[9];
-  x->v8[10] = s[10];
-  x->v8[11] = s[11];
-  x->v8[12] = s[12];
-  x->v8[13] = s[13];
-  x->v8[14] = s[14];
-  x->v8[15] = s[15];
-
-}
-
-#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_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 */
-
-
-static inline void
-v128_left_shift2(v128_t *x, int num_bits) {
-  int i;
-  int word_shift = num_bits >> 5;
-  int bit_shift  = num_bits & 31;
-
-  for (i=0; i < (4-word_shift); i++) {
-    x->v32[i] = x->v32[i+word_shift] << bit_shift;
-  }
-  
-  for (   ; i < word_shift; i++) {
-    x->v32[i] = 0;
-  }
-  
-}
-
-void
-v128_right_shift(v128_t *x, int index) {
-  const int base_index = index >> 5;
-  const int bit_index = index & 31;
-  int i, from;
-  uint32_t b;
-    
-  if (index > 127) {
-    v128_set_to_zero(x);
-    return;
-  }
-
-  if (bit_index == 0) {
-
-    /* copy each word from left size to right side */
-    x->v32[4-1] = x->v32[4-1-base_index];
-    for (i=4-1; i > base_index; i--) 
-      x->v32[i-1] = x->v32[i-1-base_index];
-
-  } else {
-    
-    /* set each word to the "or" of the two bit-shifted words */
-    for (i = 4; i > base_index; i--) {
-      from = i-1 - base_index;
-      b = x->v32[from] << bit_index;
-      if (from > 0)
-        b |= x->v32[from-1] >> (32-bit_index);
-      x->v32[i-1] = b;
-    }
-    
-  }
-
-  /* now wrap up the final portion */
-  for (i=0; i < base_index; i++) 
-    x->v32[i] = 0;
-  
-}
-
-void
-v128_left_shift(v128_t *x, int index) {
-  int i;
-  const int base_index = index >> 5;
-  const int bit_index = index & 31;
-
-  if (index > 127) {
-    v128_set_to_zero(x);
-    return;
-  } 
-  
-  if (bit_index == 0) {
-    for (i=0; i < 4 - base_index; i++)
-      x->v32[i] = x->v32[i+base_index];
-  } else {
-    for (i=0; i < 4 - base_index - 1; i++)
-      x->v32[i] = (x->v32[i+base_index] << bit_index) ^
-        (x->v32[i+base_index+1] >> (32 - bit_index));
-    x->v32[4 - base_index-1] = x->v32[4-1] << bit_index;
-  }
-
-  /* now wrap up the final portion */
-  for (i = 4 - base_index; i < 4; i++) 
-    x->v32[i] = 0;
-
-}
-
-
-#if 0
-void
-v128_add(v128_t *z, v128_t *x, v128_t *y) {
-  /* integer addition modulo 2^128    */
-
-#ifdef WORDS_BIGENDIAN
-  uint64_t tmp;
-    
-  tmp = x->v32[3] + y->v32[3];
-  z->v32[3] = (uint32_t) tmp;
-  
-  tmp =  x->v32[2] + y->v32[2] + (tmp >> 32);
-  z->v32[2] = (uint32_t) tmp;
-
-  tmp =  x->v32[1] + y->v32[1] + (tmp >> 32);
-  z->v32[1] = (uint32_t) tmp;
-  
-  tmp =  x->v32[0] + y->v32[0] + (tmp >> 32);
-  z->v32[0] = (uint32_t) tmp;
-
-#else /* assume little endian architecture */
-  uint64_t tmp;
-  
-  tmp = htonl(x->v32[3]) + htonl(y->v32[3]);
-  z->v32[3] = ntohl((uint32_t) tmp);
-  
-  tmp =  htonl(x->v32[2]) + htonl(y->v32[2]) + htonl(tmp >> 32);
-  z->v32[2] = ntohl((uint32_t) tmp);
-
-  tmp =  htonl(x->v32[1]) + htonl(y->v32[1]) + htonl(tmp >> 32);
-  z->v32[1] = ntohl((uint32_t) tmp);
-  
-  tmp =  htonl(x->v32[0]) + htonl(y->v32[0]) + htonl(tmp >> 32);
-  z->v32[0] = ntohl((uint32_t) tmp);
-
-#endif /* WORDS_BIGENDIAN */
-  
-}
-#endif
-
-int
-octet_string_is_eq(uint8_t *a, uint8_t *b, int len) {
-  uint8_t *end = b + len;
-  while (b < end)
-    if (*a++ != *b++)
-      return 1;
-  return 0;
-}
-
-void
-octet_string_set_to_zero(uint8_t *s, int len) {
-  uint8_t *end = s + len;
-
-  do {
-    *s = 0;
-  } while (++s < end);
-  
-}
-
-
-/* functions below not yet tested! */
-
-int
-v32_low_bit(v32_t *w) {
-  int value;
-
-  value = low_bit[w->v8[0]];
-  if (value != -1)
-    return value;
-  value = low_bit[w->v8[1]];
-  if (value != -1)
-    return value + 8;
-  value = low_bit[w->v8[2]];
-  if (value != -1)
-    return value + 16;
-  value = low_bit[w->v8[3]];
-  if (value == -1)
-    return -1;
-  return value + 24;
-}
-
-/* high_bit not done yet */
-
-
-
-
-