pike.git / src / post_modules / Nettle / nettle.cmod

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pike.git/src/post_modules/Nettle/nettle.cmod:1:   /* nettle.cmod -*- c -*- */      #include "global.h" - RCSID("$Id: nettle.cmod,v 1.17 2003/08/25 03:34:23 nilsson Exp $"); + RCSID("$Id: nettle.cmod,v 1.18 2003/11/09 22:02:19 nisse Exp $");   #include "interpret.h"   #include "svalue.h"   /* For this_object() */   #include "object.h"   #include "module_support.h"      #include "nettle_config.h"      #ifdef HAVE_LIBNETTLE   
pike.git/src/post_modules/Nettle/nettle.cmod:33:    *! 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.counterpane.com/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   { -  CVAR struct yarrow256_ctx *ctx; +  CVAR struct yarrow256_ctx ctx;    CVAR struct yarrow_source *sources;       /*! @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) {    INT32 num = 0; -  THIS->sources = NULL; +        if(arg) {    if (arg->type != 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);    } -  -  yarrow256_init(THIS->ctx, num, THIS->sources); +  else +  { +  free (THIS->sources); +  THIS->sources = NULL;    } -  +  yarrow256_init(&THIS->ctx, num, THIS->sources); +  }       /*! @decl Yarrow seed(string 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 @[get_seed].    *! @returns    *! Returns the called object.    *! @seealso    *! @[min_seed_size], @[get_seed], @[is_seeded]    */    PIKEFUN object seed(string data)    {    if(data->len < YARROW256_SEED_FILE_SIZE)    Pike_error( "Seed must be at least 32 characters.\n" );       NO_WIDE_STRING(data); -  yarrow256_seed(THIS->ctx, data->len, data->str); +  yarrow256_seed(&THIS->ctx, data->len, data->str);    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()
pike.git/src/post_modules/Nettle/nettle.cmod:99:    }       /*! @decl string get_seed()    *! Returns part of the internal state so that it can    *! be saved for later seeding.    *! @seealso    *! @[seed]    */    PIKEFUN string get_seed()    { -  RETURN make_shared_string(THIS->ctx->seed_file); +  RETURN make_shared_binary_string(THIS->ctx.seed_file, 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()    { -  RETURN yarrow256_is_seeded(THIS->ctx); +  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()    { -  yarrow256_force_reseed(THIS->ctx); +  yarrow256_force_reseed(&THIS->ctx);    }       /*! @decl int(0..1) update(string data, int source, int entropy)    *! Inject additional entropy into the random number generator.    *!    *! @seealso    *! @[create]    */    PIKEFUN int(0..1) update(string data, int source, int entropy)    { -  +  /* FIXME: Wide strings could actually be supported here */    NO_WIDE_STRING(data); -  if( !THIS->ctx->nsources ) +  if( !THIS->sources )    Pike_error("This random generator has no sources.\n"); -  if( source<0 || source>=THIS->ctx->nsources ) +  if( source<0 || 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"); -  RETURN yarrow256_update(THIS->ctx, source, entropy, data->len, data->str); +  RETURN yarrow256_update(&THIS->ctx, source, entropy, data->len, data->str);    }       PIKEFUN int(0..) needed_sources()    { -  RETURN yarrow256_needed_sources(THIS->ctx); +  RETURN yarrow256_needed_sources(&THIS->ctx);    }       /*! @decl string random_string(int length)    *! Returns a pseudo-random string of the requested @[length].    */    PIKEFUN string random_string(int length)    {    struct pike_string *rnd;    if(length < 0)    Pike_error("Invalid length, must be positive.\n"); -  if( !yarrow256_is_seeded(THIS->ctx) ) +  if( !yarrow256_is_seeded(&THIS->ctx) )    Pike_error("Random generator not seeded.\n");    rnd = begin_shared_string(length); -  yarrow256_random(THIS->ctx, length, rnd->str); +  yarrow256_random(&THIS->ctx, length, rnd->str);    RETURN end_shared_string(rnd);    }       INIT    { -  THIS->ctx = xalloc(sizeof(struct yarrow256_ctx)); -  THIS->ctx->nsources = 0; +  THIS->sources = NULL; +  yarrow256_init(&THIS->ctx, 0, NULL);    }    EXIT    { -  if(THIS->ctx->nsources) free(THIS->sources); -  free(THIS->ctx); +  /* It's ok to call free(NULL); */ +  free(THIS->sources);    }   }      /*! @endclass    */      char *crypt_md5(int pl, const char *pw, int sl, const char *salt);      /*! @decl string crypt_md5(string password, string salt)    *! Does the crypt_md5 abrakadabra (MD5 + snakeoil).