text: /*
   * osc_fmt_plug.c
   *
   * Salted md5, as seen in osCommerce.  This is $dynamic_4$ format, with a 2
   * byte salt. The format is:  md5($s.$p).
   *
   * By JimF, 2012.  The reason for this format, is so that I can add
   * a method to find these when we ONLY have the hash, and not the salt.
   * In that mode (-regen-lost-salts=2) JtR will load the flat hash data
   * (without the salts), and then will create a salt record for ALL valid
   * salts from '  ' to '~~', and point ALL of the hashes to these salts.
   * Then john will test all hashes, using ALL salts, thus will find all
   * md5($s.$p) where the $s is a 2 byte salt.  NOTE there are 95^2 salts
   * (9025 salts).
   *
   * NOTE This file was taken from the PHPS_fmt_plug.c (which is also a
   * 'thin' dynamic format). That format already had hooks to do the salt
   * loading. We have 3 byte salts there, but it works the same (just
   * 95x slower due to the extra salt byte).
   *
   */
  
  #if AC_BUILT
  #include "autoconfig.h"
  #endif
  #ifndef DYNAMIC_DISABLED
  
  #if FMT_EXTERNS_H
  extern struct fmt_main fmt_OSC;
  #elif FMT_REGISTERS_H
  john_register_one(&fmt_OSC);
  #else
  
  #include <string.h>
  
  #include "common.h"
  #include "formats.h"
  #include "dynamic.h"
  #include "options.h"
  #include "memdbg.h"
  
  #define FORMAT_LABEL		"osc"
  #define FORMAT_NAME		"osCommerce" /* md5($salt.$pass) */
  
  #define ALGORITHM_NAME		"?" /* filled in by md5-gen */
  #define BENCHMARK_COMMENT	""
  #define BENCHMARK_LENGTH	0
  
  #define MD5_BINARY_SIZE		16
  #define MD5_HEX_SIZE		(MD5_BINARY_SIZE * 2)
  
  #define BINARY_SIZE			MD5_BINARY_SIZE
  #define BINARY_ALIGN		MEM_ALIGN_WORD
  
  #define SALT_SIZE			2
  #define DYNA_SALT_SIZE		(sizeof(char*))
  #define SALT_ALIGN			MEM_ALIGN_WORD
  
  // set PLAINTEXT_LENGTH to 0, so dyna will set this
  #define PLAINTEXT_LENGTH	0
  #define CIPHERTEXT_LENGTH	(1 + 3 + 1 + SALT_SIZE * 2 + 1 + MD5_HEX_SIZE)
  
  static struct fmt_tests osc_tests[] = {
  	{"$OSC$2020$05de5c963ee6234dc7d52f7589a1922b", "welcome"},
  	{"$OSC$3132$c02e8eef3eaa1a813c2ff87c1780f9ed", "3456test1"},
  	// repeat the hashes in the same form that is used in john.pot
  	{"$dynamic_4$05de5c963ee6234dc7d52f7589a1922b$HEX$2020", "welcome"},
  	{"$dynamic_4$c02e8eef3eaa1a813c2ff87c1780f9ed$12", "3456test1"},
  	{NULL}
  };
  
  extern struct options_main options;
  
  static char Conv_Buf[80];
  static struct fmt_main *pDynamic_4;
  static void osc_init(struct fmt_main *self);
  static void get_ptr();
  
  /* this function converts a 'native' phps signature string into a $dynamic_6$ syntax string */
  static char *Convert(char *Buf, char *ciphertext)
  {
  	unsigned long val, i;
  	char *cp;
  
  	if (text_in_dynamic_format_already(pDynamic_4, ciphertext))
  		return ciphertext;
  
  	cp = strchr(&ciphertext[7], '$');
  	if (!cp)
  		return "*";
  
  	snprintf(Buf, sizeof(Conv_Buf) - SALT_SIZE, "$dynamic_4$%s$", &cp[1]);
  	for (i = 0; i < SALT_SIZE; ++i)
  	{
  		char bTmp[3];
  		bTmp[0] = ciphertext[5+i*2];
  		bTmp[1] = ciphertext[5+i*2+1];
  		bTmp[2] = 0;
  		val = strtoul(bTmp, 0, 16);
  		sprintf(bTmp, "%c", (unsigned char)val);
  		strcat(Buf, bTmp);
  	}
  	return Buf;
  }
  
  static char *our_split(char *ciphertext, int index, struct fmt_main *self)
  {
  	get_ptr();
  	return pDynamic_4->methods.split(Convert(Conv_Buf, ciphertext), index, self);
  }
  
  static char *our_prepare(char *split_fields[10], struct fmt_main *self)
  {
  	get_ptr();
  	return pDynamic_4->methods.prepare(split_fields, self);
  }
  
  static int osc_valid(char *ciphertext, struct fmt_main *self)
  {
  	int i;
  	if (!ciphertext ) // || strlen(ciphertext) < CIPHERTEXT_LENGTH)
  		return 0;
  
  	get_ptr();
  	i = strlen(ciphertext);
  
  	if (i != CIPHERTEXT_LENGTH) {
  		return pDynamic_4->methods.valid(ciphertext, pDynamic_4);
  	}
  
  	if (strncmp(ciphertext, "$OSC$", 5) != 0)
  		return 0;
  
  	if (ciphertext[9] != '$')
  		return 0;
  
  	for (i = 0;i < SALT_SIZE*2; ++i)
  		if (atoi16[ARCH_INDEX(ciphertext[i+5])] == 0x7F)
  			return 0;
  
  	for (i = 0;i < MD5_HEX_SIZE; ++i)
  		if (atoi16[ARCH_INDEX(ciphertext[i+5+1+SALT_SIZE*2])] == 0x7F)
  			return 0;
  
  	return pDynamic_4->methods.valid(Convert(Conv_Buf, ciphertext), pDynamic_4);
  }
  
  
  static void * our_salt(char *ciphertext)
  {
  	get_ptr();
  	return pDynamic_4->methods.salt(Convert(Conv_Buf, ciphertext));
  }
  static void * our_binary(char *ciphertext)
  {
  	get_ptr();
  	return pDynamic_4->methods.binary(Convert(Conv_Buf, ciphertext));
  }
  
  struct fmt_main fmt_OSC =
  {
  	{
  		// setup the labeling and stuff. NOTE the max and min crypts are set to 1
  		// here, but will be reset within our init() function.
  		FORMAT_LABEL, FORMAT_NAME, ALGORITHM_NAME, BENCHMARK_COMMENT, BENCHMARK_LENGTH,
  		0, PLAINTEXT_LENGTH, BINARY_SIZE, BINARY_ALIGN, DYNA_SALT_SIZE, SALT_ALIGN, 1, 1, FMT_CASE | FMT_8_BIT | FMT_DYNAMIC,
  		{ NULL },
  		osc_tests
  	},
  	{
  		/*  All we setup here, is the pointer to valid, and the pointer to init */
  		/*  within the call to init, we will properly set this full object      */
  		osc_init,
  		fmt_default_done,
  		fmt_default_reset,
  		fmt_default_prepare,
  		osc_valid,
  		our_split
  	}
  };
  
  static void link_funcs() {
  	fmt_OSC.methods.salt   = our_salt;
  	fmt_OSC.methods.binary = our_binary;
  	fmt_OSC.methods.split = our_split;
  	fmt_OSC.methods.prepare = our_prepare;
  }
  
  static void osc_init(struct fmt_main *self)
  {
  	if (self->private.initialized == 0) {
  		get_ptr();
  		pDynamic_4->methods.init(pDynamic_4);
  		self->private.initialized = 1;
  	}
  }
  
  static void get_ptr() {
  	if (!pDynamic_4) {
  		pDynamic_4 = dynamic_THIN_FORMAT_LINK(&fmt_OSC, Convert(Conv_Buf, osc_tests[0].ciphertext), "osc", 0);
  		link_funcs();
  	}
  }
  
  /**
   * GNU Emacs settings: K&R with 1 tab indent.
   * Local Variables:
   * c-file-style: "k&r"
   * c-basic-offset: 8
   * indent-tabs-mode: t
   * End:
   */
  
  #endif /* plugin stanza */
  
  #endif /* DYNAMIC_DISABLED */
  