Manual Pages for UNIX Operating System command usage for man dsa

OpenSSL                                             DSA(1openssl)



NNNNAAAAMMMMEEEE
     dsa - DSA key processing

SSSSYYYYNNNNOOOOPPPPSSSSIIIISSSS
     ooooppppeeeennnnssssssssllll ddddssssaaaa [---iiinnnnffffoooorrrrmmmm PPPPEEEEMMMM||||DDDDEEEERRRR] [---ooouuuuttttffffoooorrrrmmmm PPPPEEEEMMMM||||DDDDEEEERRRR] [---iiinnnn
     ffffiiiilllleeeennnnaaaammmmeeee] [---pppaaaassssssssiiiinnnn aaaarrrrgggg] [---ooouuuutttt ffffiiiilllleeeennnnaaaammmmeeee] [---pppaaaassssssssoooouuuutttt aaaarrrrgggg]
     [---dddeeeessss] [---dddeeeessss3333] [---iiiddddeeeeaaaa] [---ttteeeexxxxtttt] [---nnnoooooooouuuutttt] [---mmmoooodddduuuulllluuuussss] [---pppuuuubbbbiiiinnnn]
     [---pppuuuubbbboooouuuutttt] [---eeennnnggggiiiinnnneeee iiiidddd]

DDDDEEEESSSSCCCCRRRRIIIIPPPPTTTTIIIIOOOONNNN
     The ddddssssaaaa command processes DSA keys. They can be converted
     between various forms and their components printed out. NNNNooootttteeee
     This command uses the traditional SSLeay compatible format
     for private key encryption: newer applications should use
     the more secure PKCS#8 format using the ppppkkkkccccssss8888

CCCCOOOOMMMMMMMMAAAANNNNDDDD OOOOPPPPTTTTIIIIOOOONNNNSSSS
     -iiiinnnnffffoooorrrrmmmm DDDDEEEERRRR||||PPPPEEEEMMMM
         This specifies the input format. The DDDDEEEERRRR option with a
         private key uses an ASN1 DER encoded form of an ASN.1
         SEQUENCE consisting of the values of version (currently
         zero), p, q, g, the public and private key components
         respectively as ASN.1 INTEGERs. When used with a public
         key it uses a SubjectPublicKeyInfo structure: it is an
         error if the key is not DSA.

         The PPPPEEEEMMMM form is the default format: it consists of the
         DDDDEEEERRRR format base64 encoded with additional header and
         footer lines. In the case of a private key PKCS#8 format
         is also accepted.

     -oooouuuuttttffffoooorrrrmmmm DDDDEEEERRRR||||PPPPEEEEMMMM
         This specifies the output format, the options have the
         same meaning as the ---iiinnnnffffoooorrrrmmmm option.

     -iiiinnnn ffffiiiilllleeeennnnaaaammmmeeee
         This specifies the input filename to read a key from or
         standard input if this option is not specified. If the
         key is encrypted a pass phrase will be prompted for.

     -ppppaaaassssssssiiiinnnn aaaarrrrgggg
         the input file password source. For more information
         about the format of aaaarrrrgggg see the PPPPAAAASSSSSSSS PPPPHHHHRRRRAAAASSSSEEEE AAAARRRRGGGGUUUUMMMMEEEENNNNTTTTSSSS
         section in openssl(1).

     -oooouuuutttt ffffiiiilllleeeennnnaaaammmmeeee
         This specifies the output filename to write a key to or
         standard output by is not specified. If any encryption
         options are set then a pass phrase will be prompted for.
         The output filename should nnnnooootttt be the same as the input
         filename.




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OpenSSL                                             DSA(1openssl)



     -ppppaaaassssssssoooouuuutttt aaaarrrrgggg
         the output file password source. For more information
         about the format of aaaarrrrgggg see the PPPPAAAASSSSSSSS PPPPHHHHRRRRAAAASSSSEEEE AAAARRRRGGGGUUUUMMMMEEEENNNNTTTTSSSS
         section in openssl(1).

     -ddddeeeessss||||-ddddeeeessss3333||||-iiiiddddeeeeaaaa
         These options encrypt the private key with the DES,
         triple DES, or the IDEA ciphers respectively before
         outputting it. A pass phrase is prompted for.  If none
         of these options is specified the key is written in
         plain text. This means that using the ddddssssaaaa utility to
         read in an encrypted key with no encryption option can
         be used to remove the pass phrase from a key, or by
         setting the encryption options it can be use to add or
         change the pass phrase.  These options can only be used
         with PEM format output files.

     -tttteeeexxxxtttt
         prints out the public, private key components and
         parameters.

     -nnnnoooooooouuuutttt
         this option prevents output of the encoded version of
         the key.

     -mmmmoooodddduuuulllluuuussss
         this option prints out the value of the public key
         component of the key.

     -ppppuuuubbbbiiiinnnn
         by default a private key is read from the input file:
         with this option a public key is read instead.

     -ppppuuuubbbboooouuuutttt
         by default a private key is output. With this option a
         public key will be output instead. This option is
         automatically set if the input is a public key.

     -eeeennnnggggiiiinnnneeee iiiidddd
         specifying an engine (by it's unique iiiidddd string) will
         cause rrrreeeeqqqq to attempt to obtain a functional reference to
         the specified engine, thus initialising it if needed.
         The engine will then be set as the default for all
         available algorithms.

NNNNOOOOTTTTEEEESSSS
     The PEM private key format uses the header and footer lines:

      -----BEGIN DSA PRIVATE KEY-----
      -----END DSA PRIVATE KEY-----

     The PEM public key format uses the header and footer lines:



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OpenSSL                                             DSA(1openssl)



      -----BEGIN PUBLIC KEY-----
      -----END PUBLIC KEY-----


EEEEXXXXAAAAMMMMPPPPLLLLEEEESSSS
     To remove the pass phrase on a DSA private key:

      openssl dsa -in key.pem -out keyout.pem

     To encrypt a private key using triple DES:

      openssl dsa -in key.pem -des3 -out keyout.pem

     To convert a private key from PEM to DER format:

      openssl dsa -in key.pem -outform DER -out keyout.der

     To print out the components of a private key to standard
     output:

      openssl dsa -in key.pem -text -noout

     To just output the public part of a private key:

      openssl dsa -in key.pem -pubout -out pubkey.pem


SSSSEEEEEEEE AAAALLLLSSSSOOOO
     dsaparam(1), gendsa(1), rsa(1), genrsa(1)


























30/Jan/2003            Last change: 0.9.8o                      3