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%%	options

copyright owner	=	Dirk Krause
copyright year	=	2011-xxxx
license		=	bsd



%%	header

#include "dk3conf.h"
#include "dk3types.h"

#ifdef __cplusplus
extern "C" {
#endif

/**	Get checksum type for a given name.
	@param	n	Message digest name ("MD5", "SHA-1", "SHA-224",
	"SHA-256", "SHA-384", "SHA-512", or "RIPEMD-160").
	@param	app	Application structure for diagnostics, may be NULL.
	@return	Integer representation (see @ref mdtypes) on success,
	-1 on error.
*/
int
dk3checksum_get_type_app(dkChar const *n, dk3_app_t *app);

/**	Build checksum for a file.
	@param	db	Destination buffer.
	@param	sz	Size of destination buffer.
	@param	fn	File name to process.
	@param	cst	Checksum type (message digest type,
	see @ref mdtypes).
	@param	cse	Binary to text encoding for message digest
	(see @ref dataencoding).
	@param	app	Application structure for diagnostics, may be NULL.
	@return	1 on success, 0 on error.
*/
int
dk3checksum_build_app(
  char *db, size_t sz, dkChar const *fn, int cst, int cse, dk3_app_t *app
);

/**	Get string length produced for a message digest and encoding type.
	@param	cst	Message digest type, see @ref mdtypes.
	@param	cse	Binary to text encoding, see @ref dataencoding.
	@return	Number of characters produced.
*/
size_t
dk3checksum_length(int cst, int cse);

/**	Get name for message digest type.
	@param	tp	Digest type, see @ref mdtypes.
	@return	Name for digest type.
*/
dkChar const *
dk3checksum_get_type_name(int tp);

#ifdef __cplusplus
}
#endif



%%	module

#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


$!trace-include



/**	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;
  $? "+ dk3chksum_conv_length %lu %d", (unsigned long)l, cse
  switch(cse) {
    case DK3_DATA_ENCODING_HEX: {
      back = dk3enc_size_bin_to_hex(l);
    } break;
    default: {
      back = dk3enc_size_bin_to_a85(l);
    } break;
  } $? "- dk3chksum_conv_length %lu", (unsigned long)back
  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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