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enc (1)
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  • enc (4) ( FreeBSD man: Специальные файлы /dev/* )
  • 
    
    

    NAME

         enc - symmetric cipher routines
    
    
    

    SYNOPSIS

         openssl enc -ciphername [-in filename] [-out filename]
         [-pass arg] [-e] [-d] [-a] [-A] [-k password] [-kfile
         filename] [-K key] [-iv IV] [-p] [-P] [-bufsize number]
         [-debug]
    
    
    

    DESCRIPTION

         The symmetric cipher commands allow data to be encrypted or
         decrypted using various block and stream ciphers using keys
         based on passwords or explicitly provided. Base64 encoding
         or decoding can also be performed either by itself or in
         addition to the encryption or decryption.
    
    
    

    OPTIONS

         -in filename
             the input filename, standard input by default.
    
         -out filename
             the output filename, standard output by default.
    
         -pass arg
             the password source. For more information about the
             format of arg see the PASS PHRASE ARGUMENTS section in
             openssl(1).
    
         -salt
             use a salt in the key derivation routines. This option
             should ALWAYS be used unless compatibility with previous
             versions of OpenSSL or SSLeay is required. This option
             is only present on OpenSSL versions 0.9.5 or above.
    
         -nosalt
             don't use a salt in the key derivation routines. This is
             the default for compatibility with previous versions of
             OpenSSL and SSLeay.
    
         -e  encrypt the input data: this is the default.
    
         -d  decrypt the input data.
    
         -a  base64 process the data. This means that if encryption
             is taking place the data is base64 encoded after
             encryption. If decryption is set then the input data is
             base64 decoded before being decrypted.
    
         -A  if the -a option is set then base64 process the data on
             one line.
    
    
         -k password
             the password to derive the key from. This is for
             compatibility with previous versions of OpenSSL.
             Superseded by the -pass argument.
    
         -kfile filename
             read the password to derive the key from the first line
             of filename.  This is for computability with previous
             versions of OpenSSL. Superseded by the -pass argument.
    
         -S salt
             the actual salt to use: this must be represented as a
             string comprised only of hex digits.
    
         -K key
             the actual key to use: this must be represented as a
             string comprised only of hex digits.
    
         -iv IV
             the actual IV to use: this must be represented as a
             string comprised only of hex digits.
    
         -p  print out the key and IV used.
    
         -P  print out the key and IV used then immediately exit:
             don't do any encryption or decryption.
    
         -bufsize number
             set the buffer size for I/O
    
         -debug
             debug the BIOs used for I/O.
    
    
    

    NOTES

         The program can be called either as openssl ciphername or
         openssl enc -ciphername.
    
         A password will be prompted for to derive the key and IV if
         necessary.
    
         The -salt option should ALWAYS be used if the key is being
         derived from a password unless you want compatibility with
         previous versions of OpenSSL and SSLeay.
    
         Without the -salt option it is possible to perform efficient
         dictionary attacks on the password and to attack stream
         cipher encrypted data. The reason for this is that without
         the salt the same password always generates the same
         encryption key. When the salt is being used the first eight
         bytes of the encrypted data are reserved for the salt: it is
         generated at random when encrypting a file and read from the
         encrypted file when it is decrypted.
         Some of the ciphers do not have large keys and others have
         security implications if not used correctly. A beginner is
         advised to just use a strong block cipher in CBC mode such
         as bf or des3.
    
         All the block ciphers use PKCS#5 padding also known as
         standard block padding: this allows a rudimentary integrity
         or password check to be performed. However since the chance
         of random data passing the test is better than 1 in 256 it
         isn't a very good test.
    
         All RC2 ciphers have the same key and effective key length.
    
         Blowfish and RC5 algorithms use a 128 bit key.
    
    
    

    SUPPORTED CIPHERS

          base64             Base 64
    
          bf-cbc             Blowfish in CBC mode
          bf                 Alias for bf-cbc
          bf-cfb             Blowfish in CFB mode
          bf-ecb             Blowfish in ECB mode
          bf-ofb             Blowfish in OFB mode
    
          cast-cbc           CAST in CBC mode
          cast               Alias for cast-cbc
          cast5-cbc          CAST5 in CBC mode
          cast5-cfb          CAST5 in CFB mode
          cast5-ecb          CAST5 in ECB mode
          cast5-ofb          CAST5 in OFB mode
    
          des-cbc            DES in CBC mode
          des                Alias for des-cbc
          des-cfb            DES in CBC mode
          des-ofb            DES in OFB mode
          des-ecb            DES in ECB mode
    
          des-ede-cbc        Two key triple DES EDE in CBC mode
          des-ede            Alias for des-ede
          des-ede-cfb        Two key triple DES EDE in CFB mode
          des-ede-ofb        Two key triple DES EDE in OFB mode
    
          des-ede3-cbc       Three key triple DES EDE in CBC mode
          des-ede3           Alias for des-ede3-cbc
          des3               Alias for des-ede3-cbc
          des-ede3-cfb       Three key triple DES EDE CFB mode
          des-ede3-ofb       Three key triple DES EDE in OFB mode
    
          desx               DESX algorithm.
    
    
    
          idea-cbc           IDEA algorithm in CBC mode
          idea               same as idea-cbc
          idea-cfb           IDEA in CFB mode
          idea-ecb           IDEA in ECB mode
          idea-ofb           IDEA in OFB mode
    
          rc2-cbc            128 bit RC2 in CBC mode
          rc2                Alias for rc2-cbc
          rc2-cfb            128 bit RC2 in CBC mode
          rc2-ecb            128 bit RC2 in CBC mode
          rc2-ofb            128 bit RC2 in CBC mode
          rc2-64-cbc         64 bit RC2 in CBC mode
          rc2-40-cbc         40 bit RC2 in CBC mode
    
          rc4                128 bit RC4
          rc4-64             64 bit RC4
          rc4-40             40 bit RC4
    
          rc5-cbc            RC5 cipher in CBC mode
          rc5                Alias for rc5-cbc
          rc5-cfb            RC5 cipher in CBC mode
          rc5-ecb            RC5 cipher in CBC mode
          rc5-ofb            RC5 cipher in CBC mode
    
    
    
    

    EXAMPLES

         Just base64 encode a binary file:
    
          openssl base64 -in file.bin -out file.b64
    
         Decode the same file
    
          openssl base64 -d -in file.b64 -out file.bin
    
         Encrypt a file using triple DES in CBC mode using a prompted
         password:
    
          openssl des3 -salt -in file.txt -out file.des3
    
         Decrypt a file using a supplied password:
    
          openssl des3 -d -salt -in file.des3 -out file.txt -k mypassword
    
         Encrypt a file then base64 encode it (so it can be sent via
         mail for example) using Blowfish in CBC mode:
    
          openssl bf -a -salt -in file.txt -out file.bf
    
         Base64 decode a file then decrypt it:
    
          openssl bf -d -salt -a -in file.bf -out file.txt
    
         Decrypt some data using a supplied 40 bit RC4 key:
    
          openssl rc4-40 -in file.rc4 -out file.txt -K 0102030405
    
    
    
    

    BUGS

         The -A option when used with large files doesn't work
         properly.
    
         There should be an option to allow an iteration count to be
         included.
    
         Like the EVP library the enc program only supports a fixed
         number of algorithms with certain parameters. So if, for
         example, you want to use RC2 with a 76 bit key or RC4 with
         an 84 bit key you can't use this program.
    
    
    
    


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