| -help | Print out a usage message. |
| -informDER|PEM|P12|ENGINE | The key input format; unspecified by default. See openssl-format-options(1) for details. |
| -outformDER|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. |
| -infilename|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. |
| -passinarg-passoutarg | The password source for the input and output file. For more information about the format of arg see openssl-passphrase-options(1). |
| -outfilename | 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. |
| -engineid | See "Engine Options" in openssl(1). This option is deprecated. |
| -propquerypropq | See "Provider Options" in openssl(1), provider(7), and property(7). |
NAME
openssl-rsa - RSA key processing command
SYNOPSIS
opensslrsa [-help] [-informDER|PEM|P12|ENGINE] [-outformDER|PEM] [-infilename|uri] [-passinarg] [-outfilename] [-passoutarg] [-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] [-engineid] [-providername] [-provider-pathpath] [-provparam[name:]key=value] [-propquerypropq]
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.
- -informDER|PEM|P12|ENGINE
The key input format; unspecified by default. See openssl-format-options(1) for details.
- -outformDER|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.
- -infilename|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.
- -passinarg, -passoutarg
The password source for the input and output file. For more information about the format of arg see openssl-passphrase-options(1).
- -outfilename
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.
- -engineid
See "Engine Options" in openssl(1). This option is deprecated.
- -providername
- -provider-pathpath
- -provparam[name:]key=value
- -propquerypropq
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.pemTo encrypt a private key using triple DES:
openssl rsa -in key.pem -des3 -out keyout.pemTo convert a private key from PEM to DER format:
openssl rsa -in key.pem -outform DER -out keyout.derTo print out the components of a private key to standard output:
openssl rsa -in key.pem -text -nooutTo just output the public part of a private key:
openssl rsa -in key.pem -pubout -out pubkey.pemOutput the public part of a private key in RSAPublicKey format:
openssl rsa -in key.pem -RSAPublicKey_out -out pubkey.pemBUGS
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 <https://www.openssl.org/source/license.html>.