diff options
| -rw-r--r-- | usr.bin/enigma/Makefile | 12 | ||||
| -rw-r--r-- | usr.bin/enigma/enigma.1 | 115 | ||||
| -rw-r--r-- | usr.bin/enigma/enigma.c | 62 |
3 files changed, 156 insertions, 33 deletions
diff --git a/usr.bin/enigma/Makefile b/usr.bin/enigma/Makefile index 7d54eb8..4044708 100644 --- a/usr.bin/enigma/Makefile +++ b/usr.bin/enigma/Makefile @@ -1,9 +1,7 @@ -all: enigma makekey +PROG= enigma +MAN1= enigma.1 -install: enigma makekey - cp enigma makekey /usr/brlcad/bin/. - cp makekey.8 /usr/brlcad/man/man1/. - ln -s enigma /usr/brlcad/bin/crypt +LINKS= ${BINDIR}/enigma ${BINDIR}/crypt +MLINKS= enigma.1 crypt.1 -clean: - rm -f enigma makekey *.o +.include <bsd.prog.mk> diff --git a/usr.bin/enigma/enigma.1 b/usr.bin/enigma/enigma.1 new file mode 100644 index 0000000..a8d05f3 --- /dev/null +++ b/usr.bin/enigma/enigma.1 @@ -0,0 +1,115 @@ +.\" +.\" enigma (aka. crypt) man page written by Joerg Wunsch. +.\" +.\" Since enigma itself is distributed in the Public Domain, this file +.\" is also. +.\" +.\" $Id$ +.\" " +.Dd October 30, 1998 +.Os +.Dt enigma 1 +.Sh NAME +.Nm enigma +.Nd very simple file encryption +.Sh SYNOPSIS +.Nm +.Op Fl s +.Op Fl k +.Op Ar password +.Nm crypt +.Op Fl s +.Op Fl k +.Op Ar password +.Sh DESCRIPTION +.Nm Enigma , +also known as +.Nm crypt +is a +.Em very +simple encryption program, working on a +.Dq secret-key +basis. It operates as a filter, i. e. it encrypts or decrypts a +stream of data from standard input, and writes the result to standard +output. It automatically detects whether the input data stream is +already encrypted, and switches into decryption mode in this case. +.Pp +There are several ways to provide the secret key to the program. By +default, the program prompts the user on the controlling terminal for +the key, using +.Xr getpass 3 . +This is the only safe way of providing it. +.Pp +Alternatively, the key can be provided as the sole command-line +argument +.Ar password +when starting the program. Obviously, this way the key can easily be +spotted by other users running +.Xr ps 1 . +As yet another alternative, +.Nm +can be given the option +.Fl k , +and it will take the key from the environment variable +.Ev CrYpTkEy . +While this at a first glance seems to be more secure than the previous +option, it actually isn't since environment variables can also be +examined with +.Xr ps 1 . +Thus this option is mainly provided for compatibility with other +implementations of +.Nm enigma . +.Pp +When specifying the option +.Fl s , +.Nm +modifies the encryption engine in a way that is supposed to make it a +little more secure, but incompatible with other implementations. +.Pp +.Ss Warning +The cryptographic value of +.Nm +is rather small. This program is only provided here for compatibility +with other operating systems that also provide an implementation. For +real encryption, refer to +.Xr bdes 1 +(from the DES distribution package), or +.Xr pgp 1 +(from the ports collection). Hoewever, restrictions for exporting, +importing or using such tools might exist in some countries, so those +stronger programs are not being shipped as part of the operating +system by default. +.Sh ENVIRONMENT +.Bl -tag -offset indent -width "XXCrYpTkEy" +.It Ev CrYpTkEy +used to obtain the secret key when option +.Fl k +has been given +.El +.Sh EXAMPLES +.Bd -literal -offset indent +man enigma | enigma > encrypted +Enter key: (XXX \(em key not echoed) +.Ed +.Pp +This will create an encrypted form of this man page, and store it in +the file +.Ql encrypted . +.Bd -literal -offset indent +enigma XXX < encrypted +.Ed +.Pp +This displays the previously created file on the terminal. +.Sh SEE ALSO +.Xr bdes 1 , +.Xr pgp 1 , +.Xr ps 1 , +.Xr getpass 3 +.Sh HISTORY +Implementations of +.Nm crypt +are very common among +.Ux +operating systems. This implementation has been taken from the +.Em Cryptbreakers Workbench +which is in the public domain. diff --git a/usr.bin/enigma/enigma.c b/usr.bin/enigma/enigma.c index 3808cc7..3b1560c 100644 --- a/usr.bin/enigma/enigma.c +++ b/usr.bin/enigma/enigma.c @@ -10,23 +10,30 @@ * Upgraded to function properly on 64-bit machines. */ -#define ECHO 010 +#include <sys/types.h> +#include <sys/wait.h> + #include <stdio.h> +#include <stdlib.h> +#include <string.h> +#include <unistd.h> + +#define MINUSKVAR "CrYpTkEy" + +#define ECHO 010 #define ROTORSZ 256 #define MASK 0377 char t1[ROTORSZ]; char t2[ROTORSZ]; char t3[ROTORSZ]; char deck[ROTORSZ]; -char *getpass(); char buf[13]; -void shuffle(); -void puth(); +void shuffle(char *); void setup(pw) -char *pw; + char *pw; { int ic, i, k, temp, pf[2], pid; unsigned random; @@ -97,18 +104,32 @@ char *pw; t2[t1[i]&MASK] = i; } +int main(argc, argv) -char *argv[]; + char *argv[]; { register int i, n1, n2, nr1, nr2; - int secureflg = 0; + int secureflg = 0, kflag = 0; + char *cp; - if (argc > 1 && argv[1][0] == '-' && argv[1][1] == 's') { - argc--; - argv++; - secureflg = 1; + if (argc > 1 && argv[1][0] == '-') { + if (argv[1][1] == 's') { + argc--; + argv++; + secureflg = 1; + } else if (argv[1][1] == 'k') { + argc--; + argv++; + kflag = 1; + } } - if (argc != 2){ + if (kflag) { + if ((cp = getenv(MINUSKVAR)) == NULL) { + fprintf(stderr, "%s not set\n", MINUSKVAR); + exit(1); + } + setup(cp); + } else if (argc != 2) { setup(getpass("Enter key:")); } else @@ -117,7 +138,7 @@ char *argv[]; n2 = 0; nr2 = 0; - while((i=getchar()) >=0) { + while((i=getchar()) != -1) { if (secureflg) { nr1 = deck[n1]&MASK; nr2 = deck[nr1]&MASK; @@ -138,6 +159,8 @@ char *argv[]; } } } + + return 0; } void @@ -158,16 +181,3 @@ shuffle(deck) deck[ic] = temp; } } - -void -puth( title, cp, len ) -char *title; -char *cp; -int len; -{ - fprintf( stderr, "%s = ", title); - while( len-- > 0 ) { - fprintf(stderr, "%2.2x ", (*cp++) & 0xFF ); - } - fprintf(stderr,"\n"); -} |
