fcrypt.c

des加解密算法程序包

/* NOCW */
#include <stdio.h>
#ifdef _OSD_POSIX
#ifndef CHARSET_EBCDIC
#define CHARSET_EBCDIC 1
#endif
#endif
#ifdef CHARSET_EBCDIC
#include <openssl/ebcdic.h>
#endif

/* This version of crypt has been developed from my MIT compatible
 * DES library.
 * Eric Young ([e-mail])
 */

/* Modification by Jens Kupferschmidt (Cu)
 * I have included directive PARA for shared memory computers.
 * I have included a directive LONGCRYPT to using this routine to cipher
 * passwords with more then 8 bytes like HP-UX 10.x it used. The MAXPLEN
 * definition is the maximum of length of password and can changed. I have
 * defined 24.
 */

#include "des_locl.h"

/* Added more values to handle illegal salt values the way normal
 * crypt() implementations do.  The patch was sent by 
 * Bjorn Gronvall <[e-mail]>
 */
static unsigned const char con_salt[128]={
0xD2,0xD3,0xD4,0xD5,0xD6,0xD7,0xD8,0xD9,
0xDA,0xDB,0xDC,0xDD,0xDE,0xDF,0xE0,0xE1,
0xE2,0xE3,0xE4,0xE5,0xE6,0xE7,0xE8,0xE9,
0xEA,0xEB,0xEC,0xED,0xEE,0xEF,0xF0,0xF1,
0xF2,0xF3,0xF4,0xF5,0xF6,0xF7,0xF8,0xF9,
0xFA,0xFB,0xFC,0xFD,0xFE,0xFF,0x00,0x01,
0x02,0x03,0x04,0x05,0x06,0x07,0x08,0x09,
0x0A,0x0B,0x05,0x06,0x07,0x08,0x09,0x0A,
0x0B,0x0C,0x0D,0x0E,0x0F,0x10,0x11,0x12,
0x13,0x14,0x15,0x16,0x17,0x18,0x19,0x1A,
0x1B,0x1C,0x1D,0x1E,0x1F,0x20,0x21,0x22,
0x23,0x24,0x25,0x20,0x21,0x22,0x23,0x24,
0x25,0x26,0x27,0x28,0x29,0x2A,0x2B,0x2C,
0x2D,0x2E,0x2F,0x30,0x31,0x32,0x33,0x34,
0x35,0x36,0x37,0x38,0x39,0x3A,0x3B,0x3C,
0x3D,0x3E,0x3F,0x40,0x41,0x42,0x43,0x44,
};

static unsigned const char cov_2char[64]={
0x2E,0x2F,0x30,0x31,0x32,0x33,0x34,0x35,
0x36,0x37,0x38,0x39,0x41,0x42,0x43,0x44,
0x45,0x46,0x47,0x48,0x49,0x4A,0x4B,0x4C,
0x4D,0x4E,0x4F,0x50,0x51,0x52,0x53,0x54,
0x55,0x56,0x57,0x58,0x59,0x5A,0x61,0x62,
0x63,0x64,0x65,0x66,0x67,0x68,0x69,0x6A,
0x6B,0x6C,0x6D,0x6E,0x6F,0x70,0x71,0x72,
0x73,0x74,0x75,0x76,0x77,0x78,0x79,0x7A
};

void fcrypt_body(DES_LONG *out,DES_key_schedule *ks,
		 DES_LONG Eswap0, DES_LONG Eswap1);

char *DES_crypt(const char *buf, const char *salt)
	{
	static char buff[14];

#ifndef CHARSET_EBCDIC
	return(DES_fcrypt(buf,salt,buff));
#else
	char e_salt[2+1];
	char e_buf[32+1];	/* replace 32 by 8 ? */
	char *ret;

	/* Copy at most 2 chars of salt */
	if ((e_salt[0] = salt[0]) != '\0')
	    e_salt[1] = salt[1];

	/* Copy at most 32 chars of password */
	strncpy (e_buf, buf, sizeof(e_buf));

	/* Make sure we have a delimiter */
	e_salt[sizeof(e_salt)-1] = e_buf[sizeof(e_buf)-1] = '\0';

	/* Convert the e_salt to ASCII, as that's what DES_fcrypt works on */
	ebcdic2ascii(e_salt, e_salt, sizeof e_salt);

	/* Convert the cleartext password to ASCII */
	ebcdic2ascii(e_buf, e_buf, sizeof e_buf);

	/* Encrypt it (from/to ASCII) */
	ret = DES_fcrypt(e_buf,e_salt,buff);

	/* Convert the result back to EBCDIC */
	ascii2ebcdic(ret, ret, strlen(ret));
	
	return ret;
#endif
	}


char *DES_fcrypt(const char *buf, const char *salt, char *ret)
	{
	unsigned int i,j,x,y;
	DES_LONG Eswap0,Eswap1;
	DES_LONG out[2],ll;
	DES_cblock key;
	DES_key_schedule ks;
	unsigned char bb[9];
	unsigned char *b=bb;
	unsigned char c,u;

	/* eay 25/08/92
	 * If you call crypt("pwd","*") as often happens when you
	 * have * as the pwd field in /etc/passwd, the function
	 * returns *\0XXXXXXXXX
	 * The \0 makes the string look like * so the pwd "*" would
	 * crypt to "*".  This was found when replacing the crypt in
	 * our shared libraries.  People found that the disabled
	 * accounts effectively had no passwd :-(. */
#ifndef CHARSET_EBCDIC
	x=ret[0]=((salt[0] == '\0')?'A':salt[0]);
	Eswap0=con_salt[x]<<2;
	x=ret[1]=((salt[1] == '\0')?'A':salt[1]);
	Eswap1=con_salt[x]<<6;
#else
	x=ret[0]=((salt[0] == '\0')?os_toascii['A']:salt[0]);
	Eswap0=con_salt[x]<<2;
	x=ret[1]=((salt[1] == '\0')?os_toascii['A']:salt[1]);
	Eswap1=con_salt[x]<<6;
#endif

/* EAY
r=strlen(buf);
r=(r+7)/8;
*/
	for (i=0; i<8; i++)
		{
		c= *(buf++);
		if (!c) break;
		key[i]=(c<<1);
		}
	for (; i<8; i++)
		key[i]=0;

	DES_set_key_unchecked(&key,&ks);
	fcrypt_body(&(out[0]),&ks,Eswap0,Eswap1);

	ll=out[0]; l2c(ll,b);
	ll=out[1]; l2c(ll,b);
	y=0;
	u=0x80;
	bb[8]=0;
	for (i=2; i<13; i++)
		{
		c=0;
		for (j=0; j<6; j++)
			{
			c<<=1;
			if (bb[y] & u) c|=1;
			u>>=1;
			if (!u)
				{
				y++;
				u=0x80;
				}
			}
		ret[i]=cov_2char[c];
		}
	ret[13]='\0';
	return(ret);
	}