08-02-2012
I did not know that.
That's seriously useful to know. Thank you!
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PKEY(1) OpenSSL PKEY(1)
NAME
pkey - public or private key processing tool
SYNOPSIS
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]
DESCRIPTION
The pkey command processes public or private keys. They can be converted between various forms and their components printed out.
COMMAND OPTIONS
-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).
-cipher
These options encrypt the private key with the supplied cipher. Any algorithm name accepted by EVP_get_cipherbyname() is acceptable
such as des3.
-text
prints out the various public or private key components in plain text in addition to the encoded version.
-text_pub
print out only public key components even if a private key is being processed.
-noout
do not output the encoded version 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 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.
EXAMPLES
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
SEE ALSO
genpkey(1), rsa(1), pkcs8(1), dsa(1), genrsa(1), gendsa(1)
1.0.1e 2013-02-11 PKEY(1)