pkey - public or private key processing tool


   openssl pkey [-inform PEM|DER] [-outform PEM|DER] [-in filename]
   [-passin arg] [-out filename] [-passout arg] [-cipher] [-text]
   [-text_pub] [-noout] [-pubin] [-pubout] [-engine id]


   The pkey command processes public or private keys. They can be
   converted between various forms and their components printed out.


   -inform DER|PEM
       This specifies the input format DER or PEM.

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

       These options encrypt the private key with the supplied cipher. Any
       algorithm name accepted by EVP_get_cipherbyname() is acceptable
       such as des3.

       prints out the various public or private key components in plain
       text in addition to the encoded version.

       print out only public key components even if a private key is being

       do not output the encoded version of the key.

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

       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 pkey 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.


   To remove the pass phrase on an RSA private key:

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

   To encrypt a private key using triple DES:

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

   To convert a private key from PEM to DER format:

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

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

    openssl pkey -in key.pem -text -noout

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

    openssl pkey -in key.pem -text_pub -noout

   To just output the public part of a private key:

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


   genpkey(1), rsa(1), pkcs8(1), dsa(1), genrsa(1), gendsa(1)


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