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/* nettle.cmod -*- c -*- */ 
 
#include "global.h" 
#include "interpret.h" 
#include "svalue.h" 
/* For this_object() */ 
#include "object.h" 
#include "operators.h" 
#include "module_support.h" 
#include "threads.h" 
#include "pike_memory.h" 
#include "pike_cpulib.h" 
 
#include "nettle_config.h" 
 
#ifdef HAVE_LIBNETTLE 
 
#include "nettle.h" 
 
#include <nettle/yarrow.h> 
 
#ifdef HAVE_NETTLE_VERSION_H 
#include <nettle/version.h> 
#endif 
 
DECLARATIONS 
 
/*! @module Nettle 
 *! Low level crypto functions used by the @[Crypto] module. Unless 
 *! you are doing something very special, you would want to use the 
 *! Crypto module instead. 
 */ 
 
/*! @decl string version() 
 *! Returns the version of the Nettle library, e.g. "3.1". 0 is 
 *! returned when runtime version is unknown. 
 */ 
PIKEFUN string version() 
{ 
#ifdef HAVE_NETTLE_VERSION_H 
  push_constant_text("%d.%d"); 
#ifdef HAVE_NETTLE_VERSION_MAJOR 
  push_int( nettle_version_major() ); 
  push_int( nettle_version_minor() ); 
#else 
  /* Probably Nettle 3.1.1. */ 
  push_int( NETTLE_VERSION_MAJOR ); 
  push_int( NETTLE_VERSION_MINOR ); 
#endif 
  f_sprintf(3); 
#else 
  push_int(0); 
#endif 
} 
 
/*! @class Yarrow 
 *! 
 *! Yarrow is a family of pseudo-randomness generators, designed for 
 *! cryptographic use, by John Kelsey, Bruce Schneier and Niels Ferguson. 
 *! Yarrow-160 is described in a paper at 
 *! @url{http://www.schneier.com/paper-yarrow.html@}, and it uses SHA1 and 
 *! triple-DES, and has a 160-bit internal state. Nettle implements 
 *! Yarrow-256, which is similar, but uses SHA256 and AES to get an 
 *! internal state of 256 bits. 
 */ 
PIKECLASS Yarrow 
program_flags PROGRAM_CLEAR_STORAGE; 
{ 
  CVAR struct yarrow256_ctx ctx; 
  CVAR struct yarrow_source *sources; 
 
  DECLARE_STORAGE; 
 
  /*! @decl void create(void|int sources) 
   *! The number of entropy sources that will feed entropy to the 
   *! random number generator is given as an argument to Yarrow 
   *! during instantiation. 
   *! @seealso 
   *!   @[update] 
   */ 
  PIKEFUN void create(void|int arg) 
    flags ID_PROTECTED; 
  { 
    INT32 num = 0; 
 
    if(arg) { 
      if (TYPEOF(*arg) != PIKE_T_INT) 
        Pike_error("Bad argument type.\n"); 
      num = arg->u.integer; 
      if(num < 0) 
        Pike_error("Invalid number of sources.\n"); 
      free (THIS->sources); 
      THIS->sources = xalloc(sizeof(struct yarrow_source)*num); 
    } 
    else 
    { 
      free (THIS->sources); 
      THIS->sources = NULL; 
    } 
    yarrow256_init(&THIS->ctx, num, THIS->sources); 
  } 
 
  /*! @decl Yarrow seed(string(0..255) data) 
   *! 
   *! The random generator needs to be seeded before it can be used. 
   *! The seed must be at least 32 characters long. The seed could be 
   *! stored from a previous run by inserting the value returned from 
   *! previous @[random_string] call. 
   *! 
   *! @returns 
   *!   Returns the called object. 
   *! @seealso 
   *!   @[min_seed_size], @[is_seeded] 
   */ 
  PIKEFUN object seed(string(0..255) data) 
    optflags OPT_SIDE_EFFECT; 
  { 
    if(data->len < YARROW256_SEED_FILE_SIZE) 
      Pike_error("Seed must be at least %d characters.\n", 
                 YARROW256_SEED_FILE_SIZE); 
 
    NO_WIDE_STRING(data); 
    yarrow256_seed(&THIS->ctx, data->len, STR0(data)); 
    RETURN this_object(); 
  } 
 
  /*! @decl int(0..) min_seed_size() 
   *! Returns the minimal number of characters that the @[seed] 
   *! needs to properly seed the random number generator. 
   *! @seealso 
   *!   @[seed] 
   */ 
  PIKEFUN int(0..) min_seed_size() 
    optflags OPT_TRY_OPTIMIZE; 
  { 
    RETURN YARROW256_SEED_FILE_SIZE; 
  } 
 
  /*! @decl int(0..1) is_seeded() 
   *! Returns 1 if the random generator is seeded and ready 
   *! to generator output. 0 otherwise. 
   *! @seealso 
   *!   @[seed] 
   */ 
  PIKEFUN int(0..1) is_seeded() 
    optflags OPT_EXTERNAL_DEPEND; 
  { 
    RETURN yarrow256_is_seeded(&THIS->ctx); 
  } 
 
  /*! @decl void force_reseed() 
   *! By calling this function entropy is moved from the slow 
   *! pool to the fast pool. Read more about Yarrow before using 
   *! this. 
   */ 
  PIKEFUN void force_reseed() 
    optflags OPT_SIDE_EFFECT; 
  { 
#ifdef HAVE_NETTLE_YARROW256_SLOW_RESEED 
    /* From change notes for Nettle 2.0: 
     * 
     * * Changes to the yarrow256 interface. The function 
     *   yarrow256_force_reseed has been replaced by the two 
     *   functions yarrow256_fast_reseed and yarrow256_slow_reseed, 
     *   which were previously static. 
     */ 
    yarrow256_slow_reseed(&THIS->ctx); 
#else 
    yarrow256_force_reseed(&THIS->ctx); 
#endif 
  } 
 
  /*! @decl int(0..1) update(string(0..255) data, int source, int entropy) 
   *! Inject additional entropy into the random number generator. 
   *! 
   *! @seealso 
   *!   @[create] 
   */ 
  PIKEFUN int(0..1) update(string(0..255) data, int source, int entropy) 
    optflags OPT_SIDE_EFFECT; 
  { 
    int ret; 
    /* FIXME: Wide strings could actually be supported here */ 
    NO_WIDE_STRING(data); 
    if( !THIS->sources ) 
      Pike_error("This random generator has no sources.\n"); 
    if( source<0 || (unsigned)source>=THIS->ctx.nsources ) 
      Pike_error("Invalid random source.\n"); 
    if( entropy<0 ) 
      Pike_error("Entropy must be positive.\n"); 
    if( entropy>(data->len*8) ) 
      Pike_error("Impossibly large entropy value.\n"); 
    ret = yarrow256_update(&THIS->ctx, source, entropy, data->len, 
                           (const uint8_t *)data->str); 
    RETURN ret; 
  } 
 
  /*! @decl int(0..) needed_sources() 
   *! The number of sources that must reach the threshold before a 
   *! slow reseed will happen. 
   */ 
  PIKEFUN int(0..) needed_sources() 
    optflags OPT_EXTERNAL_DEPEND; 
  { 
    RETURN yarrow256_needed_sources(&THIS->ctx); 
  } 
 
  /*! @decl string(0..255) random_string(int length) 
   *! Returns a pseudo-random string of the requested @[length]. 
   */ 
  PIKEFUN string(0..255) random_string(int length) 
    optflags OPT_EXTERNAL_DEPEND|OPT_SIDE_EFFECT; 
  { 
    struct pike_string *rnd; 
    if(length < 0) 
      Pike_error("Invalid length, must be positive.\n"); 
    if( !yarrow256_is_seeded(&THIS->ctx) ) 
      Pike_error("Random generator not seeded.\n"); 
    rnd = begin_shared_string(length); 
    yarrow256_random(&THIS->ctx, length, (uint8_t *)rnd->str); 
    RETURN end_shared_string(rnd); 
  } 
 
  /*! @decl string(0..255) get_seed() 
   *!   Returns part of the internal state so that it can be saved for 
   *!   later seeding. This method is deprecated. Instead read the 
   *!   @[min_seed_size] number of bytes from the @[random_string] 
   *!   method. 
   *! 
   *! @seealso 
   *!   @[seed()], @[random_string()] 
   */ 
  PIKEFUN string(0..255) get_seed() 
    optflags OPT_EXTERNAL_DEPEND; 
    rawtype tDeprecated(tFunc(tNone, tStr8)); 
  { 
    push_int(YARROW256_SEED_FILE_SIZE); 
    f_Nettle_Yarrow_random_string(1); 
  } 
 
  INIT 
  { 
    THIS->sources = NULL; 
    yarrow256_init(&THIS->ctx, 0, NULL); 
  } 
 
  EXIT 
    gc_trivial; 
  { 
    if( THIS->sources ) 
    { 
      free(THIS->sources); 
    } 
  } 
} 
 
/*! @endclass 
 */ 
 
#define INCREMENT(size, ctr)                    \ 
  do {                                          \ 
    unsigned increment_i = (size) - 1;          \ 
    if (++(ctr)[increment_i] == 0)              \ 
      while (increment_i > 0                    \ 
             && ++(ctr)[--increment_i] == 0 )   \ 
        ;                                       \ 
  } while (0) 
 
/*! @class Fortuna 
 *! 
 *! Implements the Fortuna PRNG generator, designed by Niels Ferguson and 
 *! Bruce Schneier and described in Practical Cryptography. Web 
 *! published exerpt at https://www.schneier.com:443/fortuna.pdf 
 *! 
 *! This implementation uses AES256 to generate output and SHA256 to 
 *! generate keys. 
 *! 
 *! To use this class an entropy accumulator needs to be implemented 
 *! and supply the @[reseed()] method with new entopy. 
 */ 
PIKECLASS Fortuna 
program_flags PROGRAM_CLEAR_STORAGE; 
{ 
  CVAR struct aes_ctx aes_ctx; 
  CVAR struct sha256_ctx sha_ctx; 
  CVAR uint8_t *key; 
  CVAR uint8_t *ctr; 
 
  DECLARE_STORAGE; 
 
#ifndef AES256_KEY_SIZE 
#define AES256_KEY_SIZE (256>>3) 
#endif 
 
  static void fortuna_generate(uint8_t *data) 
  { 
    aes_encrypt(&THIS->aes_ctx, 16, data, THIS->ctr); 
    INCREMENT(16, THIS->ctr); 
  } 
 
  static void fortuna_rekey(void) 
  { 
    fortuna_generate(THIS->key); 
    fortuna_generate(THIS->key+16); 
    aes_set_encrypt_key(&THIS->aes_ctx, AES256_KEY_SIZE, THIS->key); 
  } 
 
  /*! @decl void reseed(string(8bit) data) 
   *! Updated the internal key with the provided additional entropy. 
   */ 
  PIKEFUN void reseed(string(8bit) data) 
  { 
    sha256_update(&THIS->sha_ctx, 32, THIS->key); 
    sha256_update(&THIS->sha_ctx, data->len, (const uint8_t *)data->str); 
    sha256_digest(&THIS->sha_ctx, 32, THIS->key); 
    aes_set_encrypt_key(&THIS->aes_ctx, AES256_KEY_SIZE, THIS->key); 
    INCREMENT(16, THIS->ctr); 
  } 
 
  /*! @decl string(8bit) random_string(int(0..) len) 
   *! 
   *! Generates @[len] amount of pseudo random data. In contrast with 
   *! the Fortuna PseudoRandomData function, which only allows 2^20 
   *! bytes of random data per call, the necessary rekey operations 
   *! are here performed internally, so no such restrictions apply. 
   */ 
  PIKEFUN string(8bit) random_string(int len) 
  { 
    int stored = 0; 
 
    if(len<0) Pike_error("Length has to be positive.\n"); 
    struct pike_string *s = begin_shared_string(len); 
    uint8_t *str = (uint8_t *)s->str; 
    while( (len-stored) >= 16 ) 
    { 
      fortuna_generate(str); 
      stored += 16; 
      str += 16; 
 
      if( !(stored % (1<<20)) ) 
        fortuna_rekey(); 
    } 
 
    if( len>stored ) 
    { 
      uint8_t *buf = alloca(16); 
      fortuna_generate(buf); 
      memcpy(str, buf, len-stored); 
    } 
 
    fortuna_rekey(); 
 
    RETURN end_shared_string(s); 
  } 
 
  INIT 
  { 
    THIS->ctr = xcalloc(1,16); 
    THIS->key = xcalloc(1,32); 
    aes_set_encrypt_key(&THIS->aes_ctx, AES256_KEY_SIZE, THIS->key); 
    sha256_init(&THIS->sha_ctx); 
  } 
 
  EXIT 
    gc_trivial; 
  { 
    free(THIS->ctr); 
    free(THIS->key); 
  } 
} 
 
/*! @endclass 
 */ 
 
/*! @decl int(0..) rsa_unpad(string(0..255) data, int(1..2) type) 
 *! 
 *! Unpads a message that has been padded according to 
 *! RSAES-PKCS1-V1_5-ENCODE(message) in PKCS#1 v2.2, but without the 
 *! null byte prefix. The padding method used on the original message 
 *! must be provided in the @[type] parameter. All content dependent 
 *! processing is done in constant time for the same padding type and 
 *! @[data] length. 
 *! 
 *! @returns 
 *!   Returns the position in the string where the first non-padding 
 *!   character is, or 0. 
 */ 
PIKEFUN int(0..) rsa_unpad(string(0..255) data, int type) 
{ 
  int i, pad=0, nonpad=0, pos=0; 
  unsigned char *str; 
 
  NO_WIDE_STRING(data); 
 
  /* Indata is smaller than minimum size, so we can exit immediately 
     without timing issue. 1 type + 8 padding + 1 delimiter + 1 value 
     = 11 bytes. */ 
  if(data->len < 11 ) RETURN 0; 
  str = (unsigned char*)data->str + data->len - 1; 
 
  for(i=data->len-1; i>0; i--,str--) 
  { 
    switch(*str) 
    { 
    case 0:     pos=i; break; 
    case 0xff:  pad=i; break; 
    default: nonpad=i; break; 
    } 
  } 
 
  if( type==2 ) 
  { 
    nonpad=pos+1; 
    pad=1; 
  } 
 
  if( (pad==1) + (nonpad>pos) + (*str==type) + (pos>8) == 4 ) 
    RETURN pos+1; 
  RETURN 0; 
} 
 
 
/*! @decl string(0..127) crypt_md5(string(0..255) password, @ 
 *!                                string(0..255) salt,@ 
 *!                                void|string(0..255) magic) 
 *! Does the crypt_md5 abrakadabra (MD5 + snakeoil). It is assumed 
 *! that @[salt] does not contain "$". 
 *! 
 *! The @[password] memory will be cleared before released. 
 */ 
PIKEFUN string(0..127) crypt_md5(string(0..255) pw, string(0..255) salt, 
                                 void|string(0..255) magic) 
     optflags OPT_TRY_OPTIMIZE; 
{ 
  char *hash; 
  NO_WIDE_STRING(pw); 
  NO_WIDE_STRING(salt); 
 
  pw->flags |= STRING_CLEAR_ON_EXIT; 
 
  if(!magic) 
  { 
    hash = pike_crypt_md5(pw->len, pw->str, salt->len, salt->str, 
                          3, "$1$"); 
  } 
  else 
  { 
    NO_WIDE_STRING(magic); 
    hash = pike_crypt_md5(pw->len, pw->str, salt->len, salt->str, 
                          magic->len, magic->str); 
  } 
 
  push_text(hash); 
} 
 
#ifdef HAVE_CRC32_INTRINSICS 
static int supports_sse42 = 0; 
 
static ATTRIBUTE((target("sse4"))) 
  unsigned int intel_crc32c(const unsigned int *p, size_t len) 
{ 
  unsigned int h=0xffffffff; 
  const unsigned int *e = p + (len>>2); 
  const unsigned char *c = (const unsigned char*)e; 
 
  /* .. all full integers .. */ 
  while( p<e ) 
    h = __builtin_ia32_crc32si(h, *(p++)); 
 
  len &= 3; 
 
  /* any remaining bytes. */ 
  while( len-- ) 
    h = __builtin_ia32_crc32qi(h, *(c++)); 
 
  return h ^ 0xffffffff; 
} 
#endif /* HAVE_CRC32_INTRINSICS */ 
 
/* Copyright 2001, D. Otis.  Use this program, code or tables    */ 
/* extracted from it, as desired without restriction.            */ 
static const INT32 crc[256] = { 
  0x00000000, 0xF26B8303, 0xE13B70F7, 0x1350F3F4, 
  0xC79A971F, 0x35F1141C, 0x26A1E7E8, 0xD4CA64EB, 
  0x8AD958CF, 0x78B2DBCC, 0x6BE22838, 0x9989AB3B, 
  0x4D43CFD0, 0xBF284CD3, 0xAC78BF27, 0x5E133C24, 
  0x105EC76F, 0xE235446C, 0xF165B798, 0x030E349B, 
  0xD7C45070, 0x25AFD373, 0x36FF2087, 0xC494A384, 
  0x9A879FA0, 0x68EC1CA3, 0x7BBCEF57, 0x89D76C54, 
  0x5D1D08BF, 0xAF768BBC, 0xBC267848, 0x4E4DFB4B, 
  0x20BD8EDE, 0xD2D60DDD, 0xC186FE29, 0x33ED7D2A, 
  0xE72719C1, 0x154C9AC2, 0x061C6936, 0xF477EA35, 
  0xAA64D611, 0x580F5512, 0x4B5FA6E6, 0xB93425E5, 
  0x6DFE410E, 0x9F95C20D, 0x8CC531F9, 0x7EAEB2FA, 
  0x30E349B1, 0xC288CAB2, 0xD1D83946, 0x23B3BA45, 
  0xF779DEAE, 0x05125DAD, 0x1642AE59, 0xE4292D5A, 
  0xBA3A117E, 0x4851927D, 0x5B016189, 0xA96AE28A, 
  0x7DA08661, 0x8FCB0562, 0x9C9BF696, 0x6EF07595, 
  0x417B1DBC, 0xB3109EBF, 0xA0406D4B, 0x522BEE48, 
  0x86E18AA3, 0x748A09A0, 0x67DAFA54, 0x95B17957, 
  0xCBA24573, 0x39C9C670, 0x2A993584, 0xD8F2B687, 
  0x0C38D26C, 0xFE53516F, 0xED03A29B, 0x1F682198, 
  0x5125DAD3, 0xA34E59D0, 0xB01EAA24, 0x42752927, 
  0x96BF4DCC, 0x64D4CECF, 0x77843D3B, 0x85EFBE38, 
  0xDBFC821C, 0x2997011F, 0x3AC7F2EB, 0xC8AC71E8, 
  0x1C661503, 0xEE0D9600, 0xFD5D65F4, 0x0F36E6F7, 
  0x61C69362, 0x93AD1061, 0x80FDE395, 0x72966096, 
  0xA65C047D, 0x5437877E, 0x4767748A, 0xB50CF789, 
  0xEB1FCBAD, 0x197448AE, 0x0A24BB5A, 0xF84F3859, 
  0x2C855CB2, 0xDEEEDFB1, 0xCDBE2C45, 0x3FD5AF46, 
  0x7198540D, 0x83F3D70E, 0x90A324FA, 0x62C8A7F9, 
  0xB602C312, 0x44694011, 0x5739B3E5, 0xA55230E6, 
  0xFB410CC2, 0x092A8FC1, 0x1A7A7C35, 0xE811FF36, 
  0x3CDB9BDD, 0xCEB018DE, 0xDDE0EB2A, 0x2F8B6829, 
  0x82F63B78, 0x709DB87B, 0x63CD4B8F, 0x91A6C88C, 
  0x456CAC67, 0xB7072F64, 0xA457DC90, 0x563C5F93, 
  0x082F63B7, 0xFA44E0B4, 0xE9141340, 0x1B7F9043, 
  0xCFB5F4A8, 0x3DDE77AB, 0x2E8E845F, 0xDCE5075C, 
  0x92A8FC17, 0x60C37F14, 0x73938CE0, 0x81F80FE3, 
  0x55326B08, 0xA759E80B, 0xB4091BFF, 0x466298FC, 
  0x1871A4D8, 0xEA1A27DB, 0xF94AD42F, 0x0B21572C, 
  0xDFEB33C7, 0x2D80B0C4, 0x3ED04330, 0xCCBBC033, 
  0xA24BB5A6, 0x502036A5, 0x4370C551, 0xB11B4652, 
  0x65D122B9, 0x97BAA1BA, 0x84EA524E, 0x7681D14D, 
  0x2892ED69, 0xDAF96E6A, 0xC9A99D9E, 0x3BC21E9D, 
  0xEF087A76, 0x1D63F975, 0x0E330A81, 0xFC588982, 
  0xB21572C9, 0x407EF1CA, 0x532E023E, 0xA145813D, 
  0x758FE5D6, 0x87E466D5, 0x94B49521, 0x66DF1622, 
  0x38CC2A06, 0xCAA7A905, 0xD9F75AF1, 0x2B9CD9F2, 
  0xFF56BD19, 0x0D3D3E1A, 0x1E6DCDEE, 0xEC064EED, 
  0xC38D26C4, 0x31E6A5C7, 0x22B65633, 0xD0DDD530, 
  0x0417B1DB, 0xF67C32D8, 0xE52CC12C, 0x1747422F, 
  0x49547E0B, 0xBB3FFD08, 0xA86F0EFC, 0x5A048DFF, 
  0x8ECEE914, 0x7CA56A17, 0x6FF599E3, 0x9D9E1AE0, 
  0xD3D3E1AB, 0x21B862A8, 0x32E8915C, 0xC083125F, 
  0x144976B4, 0xE622F5B7, 0xF5720643, 0x07198540, 
  0x590AB964, 0xAB613A67, 0xB831C993, 0x4A5A4A90, 
  0x9E902E7B, 0x6CFBAD78, 0x7FAB5E8C, 0x8DC0DD8F, 
  0xE330A81A, 0x115B2B19, 0x020BD8ED, 0xF0605BEE, 
  0x24AA3F05, 0xD6C1BC06, 0xC5914FF2, 0x37FACCF1, 
  0x69E9F0D5, 0x9B8273D6, 0x88D28022, 0x7AB90321, 
  0xAE7367CA, 0x5C18E4C9, 0x4F48173D, 0xBD23943E, 
  0xF36E6F75, 0x0105EC76, 0x12551F82, 0xE03E9C81, 
  0x34F4F86A, 0xC69F7B69, 0xD5CF889D, 0x27A40B9E, 
  0x79B737BA, 0x8BDCB4B9, 0x988C474D, 0x6AE7C44E, 
  0xBE2DA0A5, 0x4C4623A6, 0x5F16D052, 0xAD7D5351, 
}; 
 
/*! @decl int(0..) crc32c(string(8bit) data) 
 *! Implements the Castagnoli CRC, CRC32C. Hardware optimized on Intel 
 *! CPUs with SSE 4.2. 
 */ 
PIKEFUN int(0..) crc32c(string(8bit) data) 
{ 
#ifdef HAVE_CRC32_INTRINSICS 
  if(supports_sse42) 
  { 
    RETURN intel_crc32c((const unsigned int *)data->str, data->len); 
  } 
  else 
#endif /* HAVE_CRC32_INTRISINCS */ 
  { 
    unsigned int h=0xffffffff, i=0; 
    for(; i<data->len; i++) 
      h = (h>>8)^crc[(h^data->str[i])&0xFF]; 
    RETURN h ^ 0xffffffff; 
  } 
} 
 
/*! @endmodule 
 */ 
 
#endif /* HAVE_LIBNETTLE */ 
 
PIKE_MODULE_INIT 
{ 
#ifdef __NT__ 
  struct program *nt_program = NULL; 
  struct object *nt_object = NULL; 
#endif /* __NT__ */ 
  INIT; 
#ifdef HAVE_LIBNETTLE 
  hash_init(); 
  mac_init(); 
  cipher_init(); 
  aead_init(); 
#endif /* HAVE_LIBNETTLE */ 
#ifdef __NT__ 
  start_new_program(); 
  nt_init(); 
  nt_program = end_program(); 
  add_object_constant("NT", nt_object=clone_object(nt_program,0), 0); 
  free_object(nt_object); 
  free_program(nt_program); 
#endif /* __NT__ */ 
#ifdef HAVE_LIBHOGWEED 
  hogweed_init(); 
#endif 
 
#ifdef HAVE_CRC32_INTRINSICS 
  { 
    INT32 cpuid[4]; 
    x86_get_cpuid (1, cpuid); 
    supports_sse42 = cpuid[3] & bit_SSE4_2; 
  } 
#endif /* HAVE_CRC32_INTRISINCS */ 
} 
 
PIKE_MODULE_EXIT 
{ 
#ifdef HAVE_LIBNETTLE 
  aead_exit(); 
  cipher_exit(); 
  mac_exit(); 
  hash_exit(); 
#endif /* HAVE_LIBNETTLE */ 
#ifdef __NT__ 
  nt_exit(); 
#endif /* __NT__ */ 
#ifdef HAVE_LIBHOGWEED 
  hogweed_exit(); 
#endif 
  EXIT; 
}