diff options
Diffstat (limited to 'crypto/openssl/crypto/des/des.man')
| -rw-r--r-- | crypto/openssl/crypto/des/des.man | 186 |
1 files changed, 0 insertions, 186 deletions
diff --git a/crypto/openssl/crypto/des/des.man b/crypto/openssl/crypto/des/des.man deleted file mode 100644 index 7e06a1851a0d..000000000000 --- a/crypto/openssl/crypto/des/des.man +++ /dev/null @@ -1,186 +0,0 @@ -.TH DES 1 -.SH NAME -des - encrypt or decrypt data using Data Encryption Standard -.SH SYNOPSIS -.B des -( -.B \-e -| -.B \-E -) | ( -.B \-d -| -.B \-D -) | ( -.B \-\fR[\fPcC\fR][\fPckname\fR]\fP -) | -[ -.B \-b3hfs -] [ -.B \-k -.I key -] -] [ -.B \-u\fR[\fIuuname\fR] -[ -.I input-file -[ -.I output-file -] ] -.SH DESCRIPTION -.B des -encrypts and decrypts data using the -Data Encryption Standard algorithm. -One of -.B \-e, \-E -(for encrypt) or -.B \-d, \-D -(for decrypt) must be specified. -It is also possible to use -.B \-c -or -.B \-C -in conjunction or instead of the a encrypt/decrypt option to generate -a 16 character hexadecimal checksum, generated via the -.I des_cbc_cksum. -.LP -Two standard encryption modes are supported by the -.B des -program, Cipher Block Chaining (the default) and Electronic Code Book -(specified with -.B \-b -). -.LP -The key used for the DES -algorithm is obtained by prompting the user unless the -.B `\-k -.I key' -option is given. -If the key is an argument to the -.B des -command, it is potentially visible to users executing -.BR ps (1) -or a derivative. To minimise this possibility, -.B des -takes care to destroy the key argument immediately upon entry. -If your shell keeps a history file be careful to make sure it is not -world readable. -.LP -Since this program attempts to maintain compatability with sunOS's -des(1) command, there are 2 different methods used to convert the user -supplied key to a des key. -Whenever and one or more of -.B \-E, \-D, \-C -or -.B \-3 -options are used, the key conversion procedure will not be compatible -with the sunOS des(1) version but will use all the user supplied -character to generate the des key. -.B des -command reads from standard input unless -.I input-file -is specified and writes to standard output unless -.I output-file -is given. -.SH OPTIONS -.TP -.B \-b -Select ECB -(eight bytes at a time) encryption mode. -.TP -.B \-3 -Encrypt using triple encryption. -By default triple cbc encryption is used but if the -.B \-b -option is used then triple ecb encryption is performed. -If the key is less than 8 characters long, the flag has no effect. -.TP -.B \-e -Encrypt data using an 8 byte key in a manner compatible with sunOS -des(1). -.TP -.B \-E -Encrypt data using a key of nearly unlimited length (1024 bytes). -This will product a more secure encryption. -.TP -.B \-d -Decrypt data that was encrypted with the \-e option. -.TP -.B \-D -Decrypt data that was encrypted with the \-E option. -.TP -.B \-c -Generate a 16 character hexadecimal cbc checksum and output this to -stderr. -If a filename was specified after the -.B \-c -option, the checksum is output to that file. -The checksum is generated using a key generated in a sunOS compatible -manner. -.TP -.B \-C -A cbc checksum is generated in the same manner as described for the -.B \-c -option but the DES key is generated in the same manner as used for the -.B \-E -and -.B \-D -options -.TP -.B \-f -Does nothing - allowed for compatibility with sunOS des(1) command. -.TP -.B \-s -Does nothing - allowed for compatibility with sunOS des(1) command. -.TP -.B "\-k \fIkey\fP" -Use the encryption -.I key -specified. -.TP -.B "\-h" -The -.I key -is assumed to be a 16 character hexadecimal number. -If the -.B "\-3" -option is used the key is assumed to be a 32 character hexadecimal -number. -.TP -.B \-u -This flag is used to read and write uuencoded files. If decrypting, -the input file is assumed to contain uuencoded, DES encrypted data. -If encrypting, the characters following the -u are used as the name of -the uuencoded file to embed in the begin line of the uuencoded -output. If there is no name specified after the -u, the name text.des -will be embedded in the header. -.SH SEE ALSO -.B ps (1) -.B des_crypt(3) -.SH BUGS -.LP -The problem with using the -.B -e -option is the short key length. -It would be better to use a real 56-bit key rather than an -ASCII-based 56-bit pattern. Knowing that the key was derived from ASCII -radically reduces the time necessary for a brute-force cryptographic attack. -My attempt to remove this problem is to add an alternative text-key to -DES-key function. This alternative function (accessed via -.B -E, -D, -S -and -.B -3 -) -uses DES to help generate the key. -.LP -Be carefully when using the -u option. Doing des -ud <filename> will -not decrypt filename (the -u option will gobble the d option). -.LP -The VMS operating system operates in a world where files are always a -multiple of 512 bytes. This causes problems when encrypted data is -send from unix to VMS since a 88 byte file will suddenly be padded -with 424 null bytes. To get around this problem, use the -u option -to uuencode the data before it is send to the VMS system. -.SH AUTHOR -.LP -Eric Young (eay@cryptsoft.com) |