des.c

Netscape公司提供的安全套接字层

/* des.c */
/* Copyright (C) 1993 Eric Young - see README for more details */
#include <stdio.h>
#ifdef VMS
#include <types.h>
#include <stat.h>
#else
#ifndef _IRIX
#include <sys/types.h>
#endif
#include <sys/stat.h>
#endif
#include "deseay.h"

#if defined(__STDC__) || defined(VMS) || defined(M_XENIX) || defined(MSDOS)
#include <string.h>
#define bcopy(f,t,n)    memcpy(t,f,(size_t)(n))
#define bzero(s,n)  memset(s,0,(size_t)(n))
#define bcmp(a,b,n) memcmp(a, b,(size_t)(n))
#define index(s,c)  strchr(s,c)
#endif

#ifdef PROTO
int usage(void);
int doencryption(void);
int uufwrite(char *data, int size, int num, FILE *fp);
int uufwriteEnd(FILE *fp);
int uufread(char *out,int size,int num,FILE *fp);
int uuencode(unsigned char *in,int num,unsigned char *out);
int uudecode(unsigned char *in,int num,unsigned char *out);
#else
int usage();
int doencryption();
int uufwrite();
int uufwriteEnd();
int uufread();
int uuencode();
int uudecode();
#endif

#ifdef VMS
#define EXIT(a) exit(a&0x10000000)
#else
#define EXIT(a) exit(a)
#endif

#define BUFSIZE (8*1024)
#define VERIFY  1
#define KEYSIZ  8
#define KEYSIZB 1024 /* should hit tty line limit first :-) */
char key[KEYSIZB+1];
int do_encrypt,longk=0;
char *in=NULL,*out=NULL;
FILE *DES_IN,*DES_OUT,*CKSUM_OUT;
char uuname[200];
char uubuf[50];
int uubufnum;
#define INUUBUFN    (45*100)
#define OUTUUBUF    (65*100)
char b[OUTUUBUF];
char bb[300];
des_cblock cksum={0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00};
char cksumname[200]="";

int cflag,eflag,dflag,kflag,bflag,fflag,sflag,uflag,flag3,hflag,error;

main(argc,argv)
int argc;
char *argv[];
    {
    int i;
    struct stat ins,outs;
    char *p;

    cflag=eflag=dflag=kflag=hflag=bflag=fflag=sflag=uflag=flag3=0,error=0;
    bzero(key,sizeof(key));

    for (i=1; i<argc; i++)
        {
        p=argv[i];
        if ((p[0] == '-') && (p[1] != '\0'))
            {
            p++;
            while (*p)
                {
                switch (*(p++))
                    {
                case '3':
                    flag3=1;
                /*  bflag=0; */
                    longk=1;
                    break;
                case 'c':
                    cflag=1;
                    strncpy(cksumname,p,200);
                    p+=strlen(cksumname);
                    break;
                case 'C':
                    cflag=1;
                    longk=1;
                    strncpy(cksumname,p,200);
                    p+=strlen(cksumname);
                    break;
                case 'e':
                    eflag=1;
                    break;
                case 'E':
                    eflag=1;
                    longk=1;
                    break;
                case 'd':
                    dflag=1;
                    break;
                case 'D':
                    dflag=1;
                    longk=1;
                    break;
                case 'b':
                    bflag=1;
                    flag3=0;
                    break;
                case 'f':
                    fflag=1;
                    break;
                case 's':
                    sflag=1;
                    break;
                case 'u':
                    uflag=1;
                    strncpy(uuname,p,200);
                    p+=strlen(uuname);
                    break;
                case 'h':
                    hflag=1;
                    break;
                case 'k':
                    kflag=1;
                    if ((i+1) == argc)
                        {
                        fputs("must have a key with the -k option\n",stderr);
                        error=1;
                        }
                    else
                        {
                        int j;

                        i++;
                        strncpy(key,argv[i],KEYSIZB);
                        for (j=strlen(argv[i])-1; j>=0; j--)
                            argv[i][j]='\0';
                        }
                    break;
                default:
                    fprintf(stderr,"'%c' unknown flag\n",p[-1]);
                    error=1;
                    break;
                    }
                }
            }
        else
            {
            if (in == NULL)
                in=argv[i];
            else if (out == NULL)
                out=argv[i];
            else
                error=1;
            }
        }
    if (error) usage();
    /* We either
     * do checksum or
     * do encrypt or
     * do decrypt or
     * do decrypt then ckecksum or
     * do checksum then encrypt
     */
    if (((eflag+dflag) == 1) || cflag)
        {
        if (eflag) do_encrypt=DES_ENCRYPT;
        if (dflag) do_encrypt=DES_DECRYPT;
        }
    else
        usage();

    if (    (in != NULL) &&
        (out != NULL) &&
#ifndef MSDOS
        (stat(in,&ins) != -1) &&
        (stat(out,&outs) != -1) &&
        (ins.st_dev == outs.st_dev) &&
        (ins.st_ino == outs.st_ino))
#else /* MSDOS */
        (strcmp(in,out) == 0))
#endif
            {
            fputs("input and output file are the same\n",stderr);
            EXIT(3);
            }

    if (!kflag)
        if (des_read_pw_string(key,KEYSIZB+1,"Enter key:",eflag?VERIFY:0))
            {
            fputs("password error\n",stderr);
            EXIT(2);
            }

    if (in == NULL)
        DES_IN=stdin;
    else if ((DES_IN=fopen(in,"r")) == NULL)
        {
        perror("opening input file");
        EXIT(4);
        }

    CKSUM_OUT=stdout;
    if (out == NULL)
        {
        DES_OUT=stdout;
        CKSUM_OUT=stderr;
        }
    else if ((DES_OUT=fopen(out,"w")) == NULL)
        {
        perror("opening output file");
        EXIT(5);
        }

#ifdef MSDOS
    /* This should set the file to binary mode. */
    {
#include <fcntl.h>
    if (!(uflag && dflag))
        setmode(fileno(DES_IN),O_BINARY);
    if (!(uflag && eflag))
        setmode(fileno(DES_OUT),O_BINARY);
    }
#endif

    doencryption();
    fclose(DES_IN);
    fclose(DES_OUT);
    EXIT(0);
    }

usage()
    {
    char **u;
    static char *usage[]={
"des <options> [input-file [output-file]]",
"options:",
"-e         : encrypt using sunOS compatible user key to DES key conversion.",
"-E         : encrypt ",
"-d         : decrypt using sunOS compatible user key to DES key conversion.",
"-D         : decrypt ",
"-c[ckname] : generate a cbc_cksum using sunOS compatible user key to",
"             DES key conversion and output to ckname (stdout default,",
"             stderr if data being output on stdout).  The checksum is",
"             generated before encryption and after decryption if used",
"             in conjunction with -[eEdD].",
"-C[ckname] : generate a cbc_cksum as for -c but compatible with -[ED].",
"-k key     : use key 'key'",
"-h         : the key that is entered will be a hexidecimal number",
"-u[uuname] : input file is uudecoded if -[dD] or output uuencoded",
"             data if -[eE] (uuname is the filename to put in the",
"             uuencode header).",
"-b         : encrypt using DES in ecb encryption mode, the defaut is",
"             cbc mode.",
"-3         : encrypt using tripple DES encryption.  This uses 2 keys",
"             generated from the input key.  If the input key is less",
"             than 8 characters long, this is equivelent to normal",
"             encryption.  Default is tripple cbc, -b makes it tripple ecb.",
NULL
};
    for (u=usage; *u; u++)
        {
        fputs(*u,stderr);
        fputc('\n',stderr);
        }

    EXIT(1);
    }

doencryption()
    {
    register int i;
    des_key_schedule ks,ks2;
    unsigned char iv[8],iv2[8],iv3[8];
    char *p;
    int num=0,j,k,l,rem,ll,len,last,ex=0;
    des_cblock kk,k2;
    FILE *O;
    int Exit=0;
#ifndef MSDOS
    static unsigned char buf[BUFSIZE+8],obuf[BUFSIZE+8];
#else
    static unsigned char *buf=NULL,*obuf=NULL;

    if (buf == NULL)
        {
        if (    (( buf=(unsigned char *)malloc(BUFSIZE+8)) == NULL) ||
            ((obuf=(unsigned char *)malloc(BUFSIZE+8)) == NULL))
            {
            fputs("Not enough memory\n",stderr);
            Exit=10;
            goto problems;
            }
        }
#endif

    if (hflag)
        {
        j=(flag3?16:8);
        p=key;
        for (i=0; i<j; i++)
            {
            k=0;
            if ((*p <= '9') && (*p >= '0'))
                k=(*p-'0')<<4;
            else if ((*p <= 'f') && (*p >= 'a'))
                k=(*p-'a'+10)<<4;
            else if ((*p <= 'F') && (*p >= 'A'))
                k=(*p-'A'+10)<<4;
            else
                {
                fputs("Bad hex key\n",stderr);
                Exit=9;
                goto problems;
                }
            p++;
            if ((*p <= '9') && (*p >= '0'))
                k|=(*p-'0');
            else if ((*p <= 'f') && (*p >= 'a'))
                k|=(*p-'a'+10);
            else if ((*p <= 'F') && (*p >= 'A'))
                k|=(*p-'A'+10);
            else
                {
                fputs("Bad hex key\n",stderr);
                Exit=9;
                goto problems;
                }
            p++;
            if (i < 8)
                kk[i]=k;
            else
                k2[i-8]=k;
            }
        des_set_key((C_Block *)k2,ks2);
        bzero(k2,sizeof(k2));
        }
    else if (longk || flag3)
        {
        if (flag3)
            {
            des_string_to_2keys(key,(C_Block *)kk,(C_Block *)k2);
            des_set_key((C_Block *)k2,ks2);
            bzero(k2,sizeof(k2));
            }
        else
            des_string_to_key(key,(C_Block *)kk);
        }
    else
        for (i=0; i<KEYSIZ; i++)
            {
            l=0;
            k=key[i];
            for (j=0; j<8; j++)
                {
                if (k&1) l++;
                k>>=1;
                }
            if (l & 1)
                kk[i]=key[i]&0x7f;
            else
                kk[i]=key[i]|0x80;
            }

    des_set_key((C_Block *)kk,ks);
    bzero(key,sizeof(key));
    bzero(kk,sizeof(kk));
    /* woops - A bug that does not showup under unix :-( */
    bzero(iv,sizeof(iv));
    bzero(iv2,sizeof(iv2));
    bzero(iv3,sizeof(iv3));

    l=1;
    rem=0;
    /* first read */
    if (eflag || (!dflag && cflag))
        {
        for (;;)
            {
            num=l=fread(&(buf[rem]),1,BUFSIZE,DES_IN);
            l+=rem;
            num+=rem;
            if (l < 0)
                {
                perror("read error");
                Exit=6;
                goto problems;
                }

            rem=l%8;
            len=l-rem;
            if (feof(DES_IN))
                {
                srand(time(NULL));
                for (i=7-rem; i>0; i--)
                    buf[l++]=rand()&0xff;
                buf[l++]=rem;
                ex=1;
                len+=rem;
                }
            else
                l-=rem;

            if (cflag)
                {
                des_cbc_cksum((C_Block *)buf,(C_Block *)cksum,
                    (long)len,ks,(C_Block *)cksum);
                if (!eflag)
                    {
                    if (feof(DES_IN)) break;
                    else continue;
                    }
                }

            if (bflag && !flag3)
                for (i=0; i<l; i+=8)
                    des_ecb_encrypt(
                        (des_cblock *)&(buf[i]),
                        (des_cblock *)&(obuf[i]),
                        ks,do_encrypt);