dsa(1) - phpMan

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DSA(1)                              OpenSSL                             DSA(1)



NAME
       dsa - DSA key processing

SYNOPSIS
       openssl dsa [-inform PEM|DER] [-outform PEM|DER] [-in filename] [-passin arg] [-out
       filename] [-passout arg] [-des] [-des3] [-idea] [-text] [-noout] [-modulus]
       [-pubin] [-pubout] [-engine id]

DESCRIPTION
       The dsa command processes DSA keys. They can be converted between various forms and
       their components printed out. Note This command uses the traditional SSLeay
       compatible format for private key encryption: newer applications should use the
       more secure PKCS#8 format using the pkcs8

COMMAND OPTIONS
       -inform DER|PEM
           This specifies the input format. The DER 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 PEM form is the default format: it consists of the DER format base64
           encoded with additional header and footer lines. In the case of a private key
           PKCS#8 format is also accepted.

       -outform DER|PEM
           This specifies the output format, the options have the same meaning as the
           -inform option.

       -in filename
           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.

       -passin arg
           the input file password source. For more information about the format of arg
           see the PASS PHRASE ARGUMENTS section in openssl(1).

       -out filename
           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 not be the same as the input filename.

       -passout arg
           the output file password source. For more information about the format of arg
           see the PASS PHRASE ARGUMENTS section in openssl(1).

       -des|-des3|-idea
           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 dsa 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.

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

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

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

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

       -pubout
           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.

       -engine id
           specifying an engine (by its unique id string) will cause dsa 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.

NOTES
       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:

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

EXAMPLES
       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

SEE ALSO
       dsaparam(1), gendsa(1), rsa(1), genrsa(1)



1.0.1e                            2013-02-11                            DSA(1)

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