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/* hash.cmod -*- c -*- */ 
 
#include "global.h" 
RCSID("$Id: hash.cmod,v 1.17 2004/02/21 02:35:42 nilsson Exp $"); 
#include "interpret.h" 
#include "svalue.h" 
#include "threads.h" 
 
/* For this_object() */ 
#include "object.h" 
#include "module_support.h" 
 
#include "nettle_config.h" 
 
#ifdef HAVE_LIBNETTLE 
 
#include "nettle.h" 
 
#include <nettle/md5.h> 
#ifdef HAVE_NETTLE_MD4_INIT 
#include <nettle/md4.h> 
#include <nettle/md2.h> 
#endif 
#include <nettle/sha.h> 
#include <nettle/nettle-meta.h> 
 
#include <assert.h> 
#include <stdio.h> 
#include <stdarg.h> 
 
#if 0 
static void 
werror(const char *format, ...) 
{ 
  va_list args; 
 
  va_start(args, format); 
  vfprintf(stderr, format, args); 
  va_end(args); 
} 
#else 
#define werror(x) 
#endif 
 
/*! @module Nettle */ 
 
/*! @class HashInfo 
 *! 
 *! Represents information about a hash algorithm, such as 
 *! name, digest size, and internal block size. 
 */ 
PIKECLASS HashInfo 
{ 
  CVAR const struct nettle_hash *meta; 
 
  /*! @decl string name(void) 
   *! 
   *! Returns a human readable name for the algorithm. 
   */ 
  PIKEFUN string name() 
    optflags OPT_TRY_OPTIMIZE; 
    { 
      if (!THIS->meta) 
        Pike_error("HashInfo not properly initialized.\n"); 
 
      push_text(THIS->meta->name); 
    } 
 
  /*! @decl string digest_size(void) 
   *! 
   *! Returns the size of a hash digests. 
   */ 
  PIKEFUN int digest_size() 
    optflags OPT_TRY_OPTIMIZE; 
    { 
      if (!THIS->meta) 
        Pike_error("HashInfo not properly initialized.\n"); 
 
      push_int(THIS->meta->digest_size); 
    } 
 
  /*! @decl string block_size(void) 
   *! 
   *! Returns the internal block size of the hash algorithm. 
   */ 
  PIKEFUN int block_size() 
    optflags OPT_TRY_OPTIMIZE; 
    { 
      if (!THIS->meta) 
        Pike_error("HashInfo not properly initialized.\n"); 
 
      push_int(THIS->meta->block_size); 
    } 
  INIT 
    { 
      werror("HashInfo->INIT\n"); 
      THIS->meta = NULL; 
    } 
} 
 
/*! @endclass HashInfo */ 
 
#define GET_META(o) \ 
( ((struct HashInfo_struct *) get_storage((o), HashInfo_program)) \ 
  ->meta) 
 
/* The algorithm objects have to be implemented in pike. */ 
 
/*! @class HashState 
 *! 
 *! Base class for hashing contexts. 
 */ 
PIKECLASS HashState 
{ 
  INHERIT HashInfo; 
  CVAR void *ctx; 
 
  /* FIXME: Create should copy state from the other object, if 
   * provided. */ 
 
  /*! @decl HashState update(string data) 
   *! 
   *! Hashes more data. 
   */ 
  PIKEFUN object update(string data) 
    optflags OPT_SIDE_EFFECT; 
    { 
      const struct nettle_hash *meta = 
        GET_META(Pike_fp->current_object); 
 
      if (!THIS->ctx || !meta) 
        Pike_error("HashState not properly initialized.\n"); 
 
      NO_WIDE_STRING(data); 
      THREADS_ALLOW(); 
      meta->update(THIS->ctx, data->len, data->str); 
      THREADS_DISALLOW(); 
 
      push_object(this_object()); 
    } 
 
  /*! @decl string digest(int|void length) 
   *! 
   *! Generates a digests, and resets the hashing contents. 
   *! 
   *! @param length 
   *!   If the length argument is provided, the digest is truncated 
   *!   to the given length. 
   *! 
   *! @returns 
   *!   The digest. 
   */ 
  PIKEFUN string digest(int|void arg) 
    { 
      const struct nettle_hash *meta; 
      struct pike_string *digest; 
      unsigned length; 
 
      if (! THIS->ctx) 
        Pike_error("HashState not properly initialized.\n"); 
 
      meta = GET_META(Pike_fp->current_object); 
      assert(meta); 
       
      if (!arg) 
        length = meta->digest_size; 
      else 
        { 
          if (arg->type != PIKE_T_INT) 
            Pike_error("Bad argument type.\n"); 
          if (arg->u.integer < 0) 
            Pike_error("Invalid length, must be positive.\n"); 
          if ((unsigned)arg->u.integer > meta->digest_size) 
            Pike_error("Unsupported digest length.\n"); 
 
          length = arg->u.integer; 
        } 
       
      digest = begin_shared_string(length); 
      meta->digest(THIS->ctx, length, digest->str); 
      push_string(end_shared_string(digest)); 
    } 
 
  INIT 
    { 
      werror("HashState->INIT\n"); 
      THIS->ctx = NULL; 
    } 
  EXIT 
    { 
      werror("HashState->EXIT\n"); 
      if (THIS->ctx && Pike_fp->current_object->prog) 
      { 
        const struct nettle_hash *meta = 
          GET_META(Pike_fp->current_object); 
        assert(meta); 
        memset(THIS->ctx, 0, meta->context_size); 
      } 
    } 
} 
 
/*! @endclass HashState */ 
 
/*! @class MD5_Info 
 *! 
 *! Internal mixin class, intended to be multiply inherited 
 *! together with HashInfo. */ 
 
PIKECLASS MD5_Info 
{ 
  INIT 
    { 
      struct HashInfo_struct *HashInfo 
        = (struct HashInfo_struct *) get_storage(Pike_fp->current_object, 
                                                 HashInfo_program); 
 
      werror("MD5_Info->INIT\n"); 
       
      if (HashInfo && !HashInfo->meta) 
        HashInfo->meta = &nettle_md5; 
      else { 
        /* Can't call Pike_error here.  
         * Pike_error("Can't initialize this object.\n"); */ 
        werror("MD5_Info->INIT failed\n"); 
      } 
    } 
} 
 
/*! @endclass MD5_Info */ 
 
/*! @class MD5_State 
 *! 
 *! State for MD5 hashing. 
 */ 
PIKECLASS MD5_State 
{ 
  INHERIT MD5_Info; 
  INHERIT HashState; 
  CVAR struct md5_ctx md5; 
 
  INIT 
    { 
      struct HashState_struct *instance 
        = (struct HashState_struct *) get_storage(Pike_fp->current_object, 
                                                  HashState_program); 
      werror("MD5_State->INIT\n"); 
 
      assert(instance); 
 
      md5_init(&THIS->md5);       
      instance->ctx = &THIS->md5; 
    } 
} 
/*! @endclass MD5_State */ 
 
#ifdef HAVE_NETTLE_MD4_INIT 
 
/*! @class MD4_Info 
 *! 
 *! Internal mixin class, intended to be multiply inherited 
 *! together with HashInfo. */ 
 
PIKECLASS MD4_Info 
{ 
  INIT 
    { 
      struct HashInfo_struct *HashInfo 
        = (struct HashInfo_struct *) get_storage(Pike_fp->current_object, 
                                                 HashInfo_program); 
 
      werror("MD4_Info->INIT\n"); 
       
      if (HashInfo && !HashInfo->meta) 
        HashInfo->meta = &nettle_md4; 
      else { 
        /* Can't call Pike_error here.  
         * Pike_error("Can't initialize this object.\n"); */ 
        werror("MD4_Info->INIT failed\n"); 
      } 
    } 
} 
 
/*! @endclass MD4_Info */ 
 
/*! @class MD4_State 
 *! 
 *! State for MD4 hashing. 
 */ 
PIKECLASS MD4_State 
{ 
  INHERIT MD4_Info; 
  INHERIT HashState; 
  CVAR struct md4_ctx md4; 
 
  INIT 
    { 
      struct HashState_struct *instance 
        = (struct HashState_struct *) get_storage(Pike_fp->current_object, 
                                                  HashState_program); 
      werror("MD4_State->INIT\n"); 
 
      assert(instance); 
 
      md4_init(&THIS->md4); 
      instance->ctx = &THIS->md4; 
    } 
} 
/*! @endclass MD4_State */ 
 
/*! @class MD2_Info 
 *! 
 *! Internal mixin class, intended to be multiply inherited 
 *! together with HashInfo. */ 
 
PIKECLASS MD2_Info 
{ 
  INIT 
    { 
      struct HashInfo_struct *HashInfo 
        = (struct HashInfo_struct *) get_storage(Pike_fp->current_object, 
                                                 HashInfo_program); 
 
      werror("MD2_Info->INIT\n"); 
       
      if (HashInfo && !HashInfo->meta) 
        HashInfo->meta = &nettle_md2; 
      else { 
        /* Can't call Pike_error here.  
         * Pike_error("Can't initialize this object.\n"); */ 
        werror("MD2_Info->INIT failed\n"); 
      } 
    } 
} 
 
/*! @endclass MD2_Info */ 
 
/*! @class MD2_State 
 *! 
 *! State for MD2 hashing. 
 */ 
PIKECLASS MD2_State 
{ 
  INHERIT MD2_Info; 
  INHERIT HashState; 
  CVAR struct md2_ctx md2; 
 
  INIT 
    { 
      struct HashState_struct *instance 
        = (struct HashState_struct *) get_storage(Pike_fp->current_object, 
                                                  HashState_program); 
      werror("MD2_State->INIT\n"); 
 
      assert(instance); 
 
      md2_init(&THIS->md2); 
      instance->ctx = &THIS->md2; 
    } 
} 
/*! @endclass MD2_State */ 
 
#endif /* HAVE_NETTLE_MD4_INIT */ 
 
/*! @class SHA1_Info 
 *! 
 *! Internal mixin class, intended to be multiply inherited 
 *! together with HashInfo. */ 
 
PIKECLASS SHA1_Info 
{ 
  INIT 
    { 
      struct HashInfo_struct *HashInfo 
        = (struct HashInfo_struct *) get_storage(Pike_fp->current_object, 
                                                 HashInfo_program); 
 
      werror("SHA1_Info->INIT\n"); 
       
      if (HashInfo && !HashInfo->meta) 
        HashInfo->meta = &nettle_sha1; 
      else { 
        /* Can't call Pike_error here.  
         * Pike_error("Can't initialize this object.\n"); */ 
        werror("SHA1_Info->INIT failed\n"); 
      } 
    } 
} 
 
/*! @endclass SHA1_Info */ 
 
/*! @class SHA1_State 
 *! 
 *! State for SHA1 hashing. 
 */ 
 
PIKECLASS SHA1_State 
{ 
  INHERIT SHA1_Info; 
  INHERIT HashState; 
  CVAR struct sha1_ctx sha1; 
 
  INIT 
    { 
      struct HashState_struct *instance 
        = (struct HashState_struct *) get_storage(Pike_fp->current_object, 
                                                  HashState_program); 
      werror("SHA1_State->INIT\n"); 
 
      assert(instance); 
 
      sha1_init(&THIS->sha1);       
      instance->ctx = &THIS->sha1; 
    } 
} 
/*! @endclass SHA1_State */ 
 
/*! @class SHA256_Info 
 *! 
 *! Internal mixin class, intended to be multiply inherited 
 *! together with HashInfo. */ 
 
PIKECLASS SHA256_Info 
{ 
  INIT 
    { 
      struct HashInfo_struct *HashInfo 
        = (struct HashInfo_struct *) get_storage(Pike_fp->current_object, 
                                                 HashInfo_program); 
 
      werror("SHA256_Info->INIT\n"); 
       
      if (HashInfo && !HashInfo->meta) 
        HashInfo->meta = &nettle_sha256; 
      else { 
        /* Can't call Pike_error here.  
         * Pike_error("Can't initialize this object.\n"); */ 
        werror("SHA256_Info->INIT failed\n"); 
      } 
    } 
} 
 
/*! @endclass SHA256_Info */ 
 
/*! @class SHA256_State 
 *! 
 *! State for SHA256 hashing. 
 */ 
 
PIKECLASS SHA256_State 
{ 
  INHERIT SHA256_Info; 
  INHERIT HashState; 
  CVAR struct sha256_ctx sha256; 
 
  INIT 
    { 
      struct HashState_struct *instance 
        = (struct HashState_struct *) get_storage(Pike_fp->current_object, 
                                                  HashState_program); 
      werror("SHA256_State->INIT\n"); 
 
      assert(instance); 
 
      sha256_init(&THIS->sha256); 
      instance->ctx = &THIS->sha256; 
    } 
} 
/*! @endclass SHA256_State */ 
 
/*! @endmodule Nettle */ 
 
void 
hash_init(void) 
{ 
  werror("Nettle, hash init\n"); 
  INIT; 
} 
 
void 
hash_exit(void) 
{ 
  werror("Nettle, hash exit\n"); 
  EXIT; 
} 
 
#endif /* HAVE_LIBNETTLE */