400 lines
12 KiB
Groff
400 lines
12 KiB
Groff
.\" Automatically generated by Pod::Man version 1.15
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.\" Wed Feb 19 16:49:33 2003
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.\" ======================================================================
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.\"
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.IX Title "ENC 1"
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.TH ENC 1 "0.9.7a" "2003-02-19" "OpenSSL"
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.UC
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.SH "NAME"
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enc \- symmetric cipher routines
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.SH "SYNOPSIS"
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.IX Header "SYNOPSIS"
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\&\fBopenssl enc \-ciphername\fR
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[\fB\-in filename\fR]
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[\fB\-out filename\fR]
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[\fB\-pass arg\fR]
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[\fB\-e\fR]
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[\fB\-d\fR]
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[\fB\-a\fR]
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[\fB\-A\fR]
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[\fB\-k password\fR]
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[\fB\-kfile filename\fR]
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[\fB\-K key\fR]
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[\fB\-iv \s-1IV\s0\fR]
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[\fB\-p\fR]
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[\fB\-P\fR]
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[\fB\-bufsize number\fR]
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[\fB\-nopad\fR]
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[\fB\-debug\fR]
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.SH "DESCRIPTION"
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.IX Header "DESCRIPTION"
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The symmetric cipher commands allow data to be encrypted or decrypted
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using various block and stream ciphers using keys based on passwords
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or explicitly provided. Base64 encoding or decoding can also be performed
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either by itself or in addition to the encryption or decryption.
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.SH "OPTIONS"
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.IX Header "OPTIONS"
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.Ip "\fB\-in filename\fR" 4
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.IX Item "-in filename"
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the input filename, standard input by default.
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.Ip "\fB\-out filename\fR" 4
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.IX Item "-out filename"
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the output filename, standard output by default.
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.Ip "\fB\-pass arg\fR" 4
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.IX Item "-pass arg"
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the password source. For more information about the format of \fBarg\fR
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see the \fB\s-1PASS\s0 \s-1PHRASE\s0 \s-1ARGUMENTS\s0\fR section in openssl(1).
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.Ip "\fB\-salt\fR" 4
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.IX Item "-salt"
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use a salt in the key derivation routines. This option should \fB\s-1ALWAYS\s0\fR
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be used unless compatibility with previous versions of OpenSSL or SSLeay
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is required. This option is only present on OpenSSL versions 0.9.5 or
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above.
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.Ip "\fB\-nosalt\fR" 4
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.IX Item "-nosalt"
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don't use a salt in the key derivation routines. This is the default for
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compatibility with previous versions of OpenSSL and SSLeay.
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.Ip "\fB\-e\fR" 4
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.IX Item "-e"
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encrypt the input data: this is the default.
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.Ip "\fB\-d\fR" 4
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.IX Item "-d"
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decrypt the input data.
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.Ip "\fB\-a\fR" 4
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.IX Item "-a"
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base64 process the data. This means that if encryption is taking place
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the data is base64 encoded after encryption. If decryption is set then
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the input data is base64 decoded before being decrypted.
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.Ip "\fB\-A\fR" 4
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.IX Item "-A"
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if the \fB\-a\fR option is set then base64 process the data on one line.
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.Ip "\fB\-k password\fR" 4
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.IX Item "-k password"
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the password to derive the key from. This is for compatibility with previous
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versions of OpenSSL. Superseded by the \fB\-pass\fR argument.
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.Ip "\fB\-kfile filename\fR" 4
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.IX Item "-kfile filename"
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read the password to derive the key from the first line of \fBfilename\fR.
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This is for computability with previous versions of OpenSSL. Superseded by
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the \fB\-pass\fR argument.
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.Ip "\fB\-S salt\fR" 4
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.IX Item "-S salt"
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the actual salt to use: this must be represented as a string comprised only
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of hex digits.
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.Ip "\fB\-K key\fR" 4
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.IX Item "-K key"
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the actual key to use: this must be represented as a string comprised only
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of hex digits. If only the key is specified, the \s-1IV\s0 must additionally specified
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using the \fB\-iv\fR option. When both a key and a password are specified, the
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key given with the \fB\-K\fR option will be used and the \s-1IV\s0 generated from the
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password will be taken. It probably does not make much sense to specify
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both key and password.
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.Ip "\fB\-iv \s-1IV\s0\fR" 4
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.IX Item "-iv IV"
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the actual \s-1IV\s0 to use: this must be represented as a string comprised only
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of hex digits. When only the key is specified using the \fB\-K\fR option, the
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\&\s-1IV\s0 must explicitly be defined. When a password is being specified using
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one of the other options, the \s-1IV\s0 is generated from this password.
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.Ip "\fB\-p\fR" 4
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.IX Item "-p"
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print out the key and \s-1IV\s0 used.
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.Ip "\fB\-P\fR" 4
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.IX Item "-P"
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print out the key and \s-1IV\s0 used then immediately exit: don't do any encryption
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or decryption.
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.Ip "\fB\-bufsize number\fR" 4
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.IX Item "-bufsize number"
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set the buffer size for I/O
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.Ip "\fB\-nopad\fR" 4
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.IX Item "-nopad"
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disable standard block padding
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.Ip "\fB\-debug\fR" 4
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.IX Item "-debug"
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debug the BIOs used for I/O.
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.SH "NOTES"
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.IX Header "NOTES"
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The program can be called either as \fBopenssl ciphername\fR or
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\&\fBopenssl enc \-ciphername\fR.
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.PP
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A password will be prompted for to derive the key and \s-1IV\s0 if necessary.
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.PP
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The \fB\-salt\fR option should \fB\s-1ALWAYS\s0\fR be used if the key is being derived
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from a password unless you want compatibility with previous versions of
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OpenSSL and SSLeay.
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.PP
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Without the \fB\-salt\fR option it is possible to perform efficient dictionary
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attacks on the password and to attack stream cipher encrypted data. The reason
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for this is that without the salt the same password always generates the same
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encryption key. When the salt is being used the first eight bytes of the
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encrypted data are reserved for the salt: it is generated at random when
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encrypting a file and read from the encrypted file when it is decrypted.
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.PP
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Some of the ciphers do not have large keys and others have security
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implications if not used correctly. A beginner is advised to just use
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a strong block cipher in \s-1CBC\s0 mode such as bf or des3.
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.PP
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All the block ciphers normally use PKCS#5 padding also known as standard block
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padding: this allows a rudimentary integrity or password check to be
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performed. However since the chance of random data passing the test is
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better than 1 in 256 it isn't a very good test.
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.PP
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If padding is disabled then the input data must be a multiple of the cipher
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block length.
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.PP
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All \s-1RC2\s0 ciphers have the same key and effective key length.
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.PP
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Blowfish and \s-1RC5\s0 algorithms use a 128 bit key.
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.SH "SUPPORTED CIPHERS"
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.IX Header "SUPPORTED CIPHERS"
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.Vb 1
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\& base64 Base 64
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.Ve
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.Vb 5
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\& bf-cbc Blowfish in CBC mode
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\& bf Alias for bf-cbc
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\& bf-cfb Blowfish in CFB mode
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\& bf-ecb Blowfish in ECB mode
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\& bf-ofb Blowfish in OFB mode
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.Ve
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.Vb 6
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\& cast-cbc CAST in CBC mode
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\& cast Alias for cast-cbc
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\& cast5-cbc CAST5 in CBC mode
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\& cast5-cfb CAST5 in CFB mode
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\& cast5-ecb CAST5 in ECB mode
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\& cast5-ofb CAST5 in OFB mode
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.Ve
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.Vb 5
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\& des-cbc DES in CBC mode
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\& des Alias for des-cbc
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\& des-cfb DES in CBC mode
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\& des-ofb DES in OFB mode
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\& des-ecb DES in ECB mode
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.Ve
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.Vb 4
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\& des-ede-cbc Two key triple DES EDE in CBC mode
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\& des-ede Alias for des-ede
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\& des-ede-cfb Two key triple DES EDE in CFB mode
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\& des-ede-ofb Two key triple DES EDE in OFB mode
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.Ve
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.Vb 5
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\& des-ede3-cbc Three key triple DES EDE in CBC mode
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\& des-ede3 Alias for des-ede3-cbc
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\& des3 Alias for des-ede3-cbc
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\& des-ede3-cfb Three key triple DES EDE CFB mode
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\& des-ede3-ofb Three key triple DES EDE in OFB mode
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.Ve
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.Vb 1
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\& desx DESX algorithm.
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.Ve
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.Vb 5
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\& idea-cbc IDEA algorithm in CBC mode
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\& idea same as idea-cbc
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\& idea-cfb IDEA in CFB mode
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\& idea-ecb IDEA in ECB mode
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\& idea-ofb IDEA in OFB mode
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.Ve
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.Vb 7
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\& rc2-cbc 128 bit RC2 in CBC mode
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\& rc2 Alias for rc2-cbc
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\& rc2-cfb 128 bit RC2 in CBC mode
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\& rc2-ecb 128 bit RC2 in CBC mode
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\& rc2-ofb 128 bit RC2 in CBC mode
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\& rc2-64-cbc 64 bit RC2 in CBC mode
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\& rc2-40-cbc 40 bit RC2 in CBC mode
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.Ve
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.Vb 3
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\& rc4 128 bit RC4
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\& rc4-64 64 bit RC4
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\& rc4-40 40 bit RC4
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.Ve
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.Vb 5
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\& rc5-cbc RC5 cipher in CBC mode
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\& rc5 Alias for rc5-cbc
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\& rc5-cfb RC5 cipher in CBC mode
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\& rc5-ecb RC5 cipher in CBC mode
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\& rc5-ofb RC5 cipher in CBC mode
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.Ve
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.SH "EXAMPLES"
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.IX Header "EXAMPLES"
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Just base64 encode a binary file:
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.PP
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.Vb 1
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\& openssl base64 -in file.bin -out file.b64
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.Ve
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Decode the same file
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.PP
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.Vb 1
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\& openssl base64 -d -in file.b64 -out file.bin
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.Ve
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Encrypt a file using triple \s-1DES\s0 in \s-1CBC\s0 mode using a prompted password:
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.PP
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.Vb 1
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\& openssl des3 -salt -in file.txt -out file.des3
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.Ve
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Decrypt a file using a supplied password:
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.PP
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.Vb 1
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\& openssl des3 -d -salt -in file.des3 -out file.txt -k mypassword
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.Ve
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Encrypt a file then base64 encode it (so it can be sent via mail for example)
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using Blowfish in \s-1CBC\s0 mode:
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.PP
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.Vb 1
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\& openssl bf -a -salt -in file.txt -out file.bf
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.Ve
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Base64 decode a file then decrypt it:
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.PP
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.Vb 1
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\& openssl bf -d -salt -a -in file.bf -out file.txt
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.Ve
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Decrypt some data using a supplied 40 bit \s-1RC4\s0 key:
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.PP
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.Vb 1
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\& openssl rc4-40 -in file.rc4 -out file.txt -K 0102030405
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.Ve
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.SH "BUGS"
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.IX Header "BUGS"
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The \fB\-A\fR option when used with large files doesn't work properly.
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.PP
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There should be an option to allow an iteration count to be included.
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.PP
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The \fBenc\fR program only supports a fixed number of algorithms with
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certain parameters. So if, for example, you want to use \s-1RC2\s0 with a
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76 bit key or \s-1RC4\s0 with an 84 bit key you can't use this program.
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