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)