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hanyw@hanyw:~$ man openssl-rsa |grep -Ev "^#34;
OPENSSL-RSA(1SSL)                                                                OpenSSL                                                               OPENSSL-RSA(1SSL)
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 .
3.0.2                                                                          2022-07-04                                                              OPENSSL-RSA(1SSL)

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