Manual: openssl-rsa

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] [-provparam [name:]key=value] [-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.  With this option a public key is read instead.   If  the  input
	   contains no public key but a private key, its public part is used.

       -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
       -provparam [name:]key=value
       -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 2000-2023 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
       .

3.5.5							 2026-01-27					   OPENSSL-RSA(1SSL)