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path: root/support/dktools/dk3chks.c
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/*
	WARNING: This file was generated by dkct.
	Changes you make here will be lost if dkct is run again!
	You should modify the original source and run dkct on it.
	Original source: dk3chks.ctr
*/

/*
Copyright (C) 2011-2017, Dirk Krause

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 opyright 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 author nor the names of 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 OWNER 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.
*/

/**	@file dk3chks.c The dk3chks module.
*/


#line 66 "dk3chks.ctr"

#include "dk3all.h"

#if DK3_HAVE_OPENSSL_MD5_H
#include <openssl/md5.h>
#endif
#if DK3_HAVE_OPENSSL_SHA_H
#include <openssl/sha.h>
#endif
#if DK3_HAVE_OPENSSL_RIPEMD_H
#include <openssl/ripemd.h>
#endif




#line 81 "dk3chks.ctr"



/**	Names of message digest algorithms.
	Order here must match order of DK3_MD_TYPE_xxx in dk3const.h.
*/
static dkChar const * const dk3_checksum_type_names[] = {
/*   0 */	dkT("MD5"),
/*   1 */	dkT("SHA-1"),
/*   2 */	dkT("SHA-224"),
/*   3 */	dkT("SHA-256"),
/*   4 */	dkT("SHA-384"),
/*   5 */	dkT("SHA-512"),
/*   6 */	dkT("RIPEMD-160"),
NULL
};



/**	String constants.
*/
static dkChar const * const kw[] = {
#if DK3_ON_WINDOWS
/*  0 */ dkT("rb"),	/* File mode, read binary. */
#else
/*  0 */ dkT("r"),	/* no difference on non-Windows. */
#endif
};



int
dk3checksum_get_type_app(dkChar const *n, dk3_app_t *app)
{
  int back = -1;
  if(n) {
    back = dk3str_array_index(dk3_checksum_type_names, n, 0);
    if(back == -1) {
      if(app) {
        dk3app_log_i3(app, DK3_LL_ERROR, 127, 128, n);
      }
    } else {
      back++;
    }
  }
  return back;
}



/**	Convert length of binary message digest to length of encoded string.
	@param	l	Number of binary bytes to encode.
	@param	cse	Message digest encoding.
	@return	Number of text characters produced by encoding.
*/
static
size_t
dk3chksum_conv_length(size_t l, int cse)
{
  size_t back = 0;
  

#line 142 "dk3chks.ctr"
  switch(cse) {
    case DK3_DATA_ENCODING_HEX: {
      back = dk3enc_size_bin_to_hex(l);
    } break;
    default: {
      back = dk3enc_size_bin_to_a85(l);
    } break;
  } 

#line 150 "dk3chks.ctr"
  return back;
}



/**	Get length of binary message digest.
	@param	cst	Message digest type.
	@return	Number of binary bytes produced.
*/
static
size_t
dk3chksum_min_length(int cst)
{
  size_t back = 0; 
  switch(cst) {
    case DK3_MD_TYPE_MD5: back = 16; break;
    case DK3_MD_TYPE_SHA_1: back = 20; break;
    case DK3_MD_TYPE_SHA_224: back = 28; break;
    case DK3_MD_TYPE_SHA_256: back = 32; break;
    case DK3_MD_TYPE_SHA_384: back = 48; break;
    case DK3_MD_TYPE_SHA_512: back = 64; break;
    case DK3_MD_TYPE_RIPEMD_160: back = 20; break;
  }
  return back;
}



/**	Build binary checksum from file.
	@param	db	Destination buffer.
	@param	sz	Size of \a db.
	@param	fipo	File pointer for read access.
	@param	cst	Checksum type.
	@param	app	Application structure for diagnostics, may be NULL.
	@return	1 on success, 0 on error.
*/
static
int
dk3checksum_binary(char *db, size_t sz, FILE *fipo, int cst, dk3_app_t *app)
{
  int back = 0;
#if DK3_HAVE_OPENSSL_SHA_H
  SHA_CTX	sha_ctx;	/* SHA-1 context. */
#if DK3_HAVE_SHA224 || DK3_HAVE_SHA256
  SHA256_CTX	sha256_ctx;	/* SHA-256 context. */
#endif
#if DK3_HAVE_SHA384 || DK3_HAVE_SHA512
  SHA512_CTX	sha512_ctx;	/* SHA-512 context. */
#endif
#endif
#if DK3_HAVE_OPENSSL_MD5_H
  MD5_CTX	md5_ctx;	/* MD5 context. */
#endif
#if DK3_HAVE_OPENSSL_RIPEMD_H
  RIPEMD160_CTX	ripemd160_ctx;	/* RIPEMD-160 context. */
#endif
  char	buffer[4096];		/* Buffer for input. */
  size_t rb = 0;		/* Number of bytes read. */
  switch(cst) {
    case DK3_MD_TYPE_MD5: {
#if DK3_HAVE_OPENSSL_MD5_H
      MD5_Init(&md5_ctx);
      while((rb = dk3sf_fread_app(buffer,1,sizeof(buffer),fipo,app)) > 0) {
        MD5_Update(&md5_ctx, buffer, rb);
      }
      MD5_Final((unsigned char *)db, &md5_ctx);
      back = 1;
#else
      if(app) {
	dk3app_log_i3(app, DK3_LL_ERROR, 156, 157, dk3_checksum_type_names[0]);
      }
#endif
    } break;
    case DK3_MD_TYPE_SHA_1: {
#if DK3_HAVE_OPENSSL_SHA_H
      SHA1_Init(&sha_ctx);
      while((rb = dk3sf_fread_app(buffer,1,sizeof(buffer),fipo,app)) > 0) {
        SHA1_Update(&sha_ctx, buffer, rb);
      }
      SHA1_Final((unsigned char *)db, &sha_ctx);
      back = 1;
#else
      if(app) {
	dk3app_log_i3(app, DK3_LL_ERROR, 156, 157, dk3_checksum_type_names[1]);
      }
#endif
    } break;
    case DK3_MD_TYPE_SHA_224: {
#if DK3_HAVE_OPENSSL_SHA_H && DK3_HAVE_SHA224
      SHA224_Init(&sha256_ctx);
      while((rb = dk3sf_fread_app(buffer,1,sizeof(buffer),fipo,app)) > 0) {
        SHA224_Update(&sha256_ctx, buffer, rb);
      }
      SHA224_Final((unsigned char *)db, &sha256_ctx);
      back = 1;
#else
      if(app) {
	dk3app_log_i3(app, DK3_LL_ERROR, 156, 157, dk3_checksum_type_names[2]);
      }
#endif
    } break;
    case DK3_MD_TYPE_SHA_256: {
#if DK3_HAVE_OPENSSL_SHA_H && DK3_HAVE_SHA256
      SHA256_Init(&sha256_ctx);
      while((rb = dk3sf_fread_app(buffer,1,sizeof(buffer),fipo,app)) > 0) {
        SHA256_Update(&sha256_ctx, buffer, rb);
      }
      SHA256_Final((unsigned char *)db, &sha256_ctx);
      back = 1;
#else
      if(app) {
	dk3app_log_i3(app, DK3_LL_ERROR, 156, 157, dk3_checksum_type_names[3]);
      }
#endif
    } break;
    case DK3_MD_TYPE_SHA_384: {
#if DK3_HAVE_OPENSSL_SHA_H && DK3_HAVE_SHA384
      SHA384_Init(&sha512_ctx);
      while((rb = dk3sf_fread_app(buffer,1,sizeof(buffer),fipo,app)) > 0) {
        SHA384_Update(&sha512_ctx, buffer, rb);
      }
      SHA384_Final((unsigned char *)db, &sha512_ctx);
      back = 1;
#else
      if(app) {
	dk3app_log_i3(app, DK3_LL_ERROR, 156, 157, dk3_checksum_type_names[4]);
      }
#endif
    } break;
    case DK3_MD_TYPE_SHA_512: {
#if DK3_HAVE_OPENSSL_SHA_H && DK3_HAVE_SHA512
      SHA512_Init(&sha512_ctx);
      while((rb = dk3sf_fread_app(buffer,1,sizeof(buffer),fipo,app)) > 0) {
        SHA512_Update(&sha512_ctx, buffer, rb);
      }
      SHA512_Final((unsigned char *)db, &sha512_ctx);
      back = 1;
#else
      if(app) {
	dk3app_log_i3(app, DK3_LL_ERROR, 156, 157, dk3_checksum_type_names[5]);
      }
#endif
    } break;
    case DK3_MD_TYPE_RIPEMD_160 : {
#if DK3_HAVE_OPENSSL_RIPEMD_H
      RIPEMD160_Init(&ripemd160_ctx);
      while((rb = dk3sf_fread_app(buffer,1,sizeof(buffer),fipo,app)) > 0) {
        RIPEMD160_Update(&ripemd160_ctx, buffer, rb);
      }
      RIPEMD160_Final((unsigned char *)db, &ripemd160_ctx);
      back = 1;
#else
      if(app) {
	dk3app_log_i3(app, DK3_LL_ERROR, 156, 157, dk3_checksum_type_names[6]);
      }
#endif
    } break;
    default: {
      if(app) {
        /* ERROR: Unknown message digest type. */
	dk3app_log_i1(app, DK3_LL_ERROR, 158);
      }
    } break;
  }
  return back;
}



size_t
dk3checksum_length(int cst, int cse)
{
  size_t back;
  back = dk3chksum_conv_length(dk3chksum_min_length(cst), cse);
  return back;
}



int
dk3checksum_build_app(
  char *db, size_t sz, dkChar const *fn, int cst, int cse, dk3_app_t *app
)
{
  int		back = 0;
  size_t	minlgt = 0;	/* Length of binary message digest. */
  size_t	convlgt = 0;	/* Length of digest converted to text. */
  size_t	i = 0;		/* Used to write zeroes. */
  dk3_stat_t	stb;		/* Test for existance. */
  char		mybuffer[256];	/* ASCII text version of digest. */
  FILE 		*fipo = NULL;	/* Input file. */
  if(db) { *db = '\0'; }
  if((db) && (sz) && (fn)) {
    if((cst > 0) && (cst <= DK3_MD_TYPE_MAX)) {
      if((cse >= 0) && (cse <= DK3_DATA_ENCODING_MAX)) {
        minlgt = dk3chksum_min_length(cst);
	convlgt = dk3chksum_conv_length(minlgt, cse);
	if(sz > convlgt) {
	  for(i = 0; i < convlgt; i++) { db[i] = '-'; } db[convlgt] = '\0';
	  if(dk3sf_stat_app(&stb, fn, app)) {
	    if(((stb.ft) & (~(DK3_FT_SYMLINK))) == DK3_FT_REGULAR) {
	      fipo = dk3sf_fopen_app(fn, kw[0], app);
	      if(fipo) {
		if(dk3checksum_binary(mybuffer,sizeof(mybuffer),fipo, cst,app))
		{
		  switch(cse) {
		    case DK3_DATA_ENCODING_HEX: {
		      back = dk3enc_bin_to_hex_app(db,sz,mybuffer,minlgt,app);
		    } break;
		    case DK3_DATA_ENCODING_ASCII85: {
		      back = dk3enc_bin_to_a85_app(db,sz,mybuffer,minlgt,app);
		    } break;
		    case DK3_DATA_ENCODING_REVERSE_ASCII85: {
		      back = dk3enc_bin_to_ra85_app(db,sz,mybuffer,minlgt,app);
		    } break;
		    default: {
		      /* Illegal encoding type! */
		      dk3app_log_i1(app, DK3_LL_ERROR, 158);
		    } break;
		  }
		}
	        fclose(fipo);
	      }
	    } else {
	      if(app) {
	        /* ERROR: Checksumming for regular files only .*/
		dk3app_log_i1(app, DK3_LL_ERROR, 159);
	      }
	    }
	  }
	} else {
	  if(app) {
	    /* ERROR: Destination buffer too small */
	    dk3app_log_i1(app, DK3_LL_ERROR, 38);
	  }
	}
      } else {
        if(app) {
	  /* ERROR: Illegal encoding number. */
	  dk3app_log_i1(app, DK3_LL_ERROR, 158);
	}
      }
    } else {
      if(app) {
        /* ERROR: Illegal digest type. */
	dk3app_log_i1(app, DK3_LL_ERROR, 158);
      }
    }
  }
  return back;
}


dkChar const *
dk3checksum_get_type_name(int tp)
{
  dkChar const *back = NULL;
  if((tp > 0) && (tp <= DK3_MD_TYPE_MAX)) {
    back = dk3_checksum_type_names[tp - 1];
  }
  return back;
}



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