NAME

       openssl-rsa - RSA key processing command

SYNOPSIS

       openssl rsa [-help] [-inform DER|PEM|P12|ENGINE] [-outform DER|PEM] [-in filename|uri]
       [-passin arg] [-out filename] [-passout arg] [-aes128] [-aes192] [-aes256] [-aria128]
       [-aria192] [-aria256] [-camellia128] [-camellia192] [-camellia256] [-des] [-des3] [-idea]
       [-text] [-noout] [-modulus] [-traditional] [-check] [-pubin] [-pubout] [-RSAPublicKey_in]
       [-RSAPublicKey_out] [-pvk-strong] [-pvk-weak] [-pvk-none] [-engine id] [-provider name]
       [-provider-path path] [-propquery propq]

DESCRIPTION

       This command processes RSA keys. They can be converted between various forms and their
       components printed out.

OPTIONS

       -help
           Print out a usage message.

       -inform DER|PEM|P12|ENGINE
           The key input format; unspecified by default.  See openssl-format-options(1) for
           details.

       -outform DER|PEM
           The key output format; the default is PEM.  See openssl-format-options(1) for details.

       -traditional
           When writing a private key, use the traditional PKCS#1 format instead of the PKCS#8
           format.

       -in filename|uri
           This specifies the input 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, -passout arg
           The password source for the input and output file.  For more information about the
           format of arg see openssl-passphrase-options(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.

       -aes128, -aes192, -aes256, -aria128, -aria192, -aria256, -camellia128, -camellia192,
       -camellia256, -des, -des3, -idea
           These options encrypt the private key with the specified cipher 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 this command can be used to remove the pass
           phrase from a key by not giving any encryption option is given, or to add or change
           the pass phrase by setting them.  These options can only be used with PEM format
           output files.

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

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

       -modulus
           This option prints out the value of the modulus of the key.

       -check
           This option checks the consistency of an RSA private 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.

       -RSAPublicKey_in, -RSAPublicKey_out
           Like -pubin and -pubout except RSAPublicKey format is used instead.

       -pvk-strong
           Enable 'Strong' PVK encoding level (default).

       -pvk-weak
           Enable 'Weak' PVK encoding level.

       -pvk-none
           Don't enforce PVK encoding.

       -engine id
           See "Engine Options" in openssl(1).  This option is deprecated.

       -provider name
       -provider-path path
       -propquery propq
           See "Provider Options" in openssl(1), provider(7), and property(7).

NOTES

       The openssl-pkey(1) command is capable of performing all the operations this command can,
       as well as supporting other public key types.

EXAMPLES

       The documentation for the openssl-pkey(1) command contains examples equivalent to the ones
       listed here.

       To remove the pass phrase on an RSA private key:

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

       To encrypt a private key using triple DES:

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

       To convert a private key from PEM to DER format:

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

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

        openssl rsa -in key.pem -text -noout

       To just output the public part of a private key:

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

       Output the public part of a private key in RSAPublicKey format:

        openssl rsa -in key.pem -RSAPublicKey_out -out pubkey.pem

BUGS

       There should be an option that automatically handles .key files, without having to
       manually edit them.

SEE ALSO

       openssl(1), openssl-pkey(1), openssl-pkcs8(1), openssl-dsa(1), openssl-genrsa(1),
       openssl-gendsa(1)

HISTORY

       The -engine option was deprecated in OpenSSL 3.0.

COPYRIGHT

       Copyright 2000-2021 The OpenSSL Project Authors. All Rights Reserved.

       Licensed under the Apache License 2.0 (the "License").  You may not use this file except
       in compliance with the License.  You can obtain a copy in the file LICENSE in the source
       distribution or at <https://www.openssl.org/source/license.html>.