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RSA(1) OpenSSL RSA(1)
NAME
rsa - RSA key processing tool
SYNOPSIS
openssl rsa [-inform PEM|NET|DER] [-outform PEM|NET|DER] [-in filename] [-passin arg]
[-out filename] [-passout arg] [-sgckey] [-aes128] [-aes192] [-aes256] [-camellia128]
[-camellia192] [-camellia256] [-des] [-des3] [-idea] [-text] [-noout] [-modulus] [-check]
[-pubin] [-pubout] [-RSAPublicKey_in] [-RSAPublicKey_out] [-engine id]
DESCRIPTION
The rsa command processes RSA keys. They can be converted between various forms and their
components printed out. Note this command uses the traditional SSLeay compatible format
for private key encryption: newer applications should use the more secure PKCS#8 format
using the pkcs8 utility.
COMMAND OPTIONS
-inform DER|NET|PEM
This specifies the input format. The DER option uses an ASN1 DER encoded form
compatible with the PKCS#1 RSAPrivateKey or SubjectPublicKeyInfo format. The PEM form
is the default format: it consists of the DER format base64 encoded with additional
header and footer lines. On input PKCS#8 format private keys are also accepted. The
NET form is a format is described in the NOTES section.
-outform DER|NET|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).
-sgckey
use the modified NET algorithm used with some versions of Microsoft IIS and SGC keys.
-aes128|-aes192|-aes256|-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 using the rsa utility to read in an encrypted
key with no encryption option can be used to remove the pass phrase from a key, or by
setting the encryption options it can be use to add or change the pass phrase. 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.
-engine id
specifying an engine (by its unique id string) will cause rsa 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.
NOTES
The PEM private key format uses the header and footer lines:
-----BEGIN RSA PRIVATE KEY-----
-----END RSA PRIVATE KEY-----
The PEM public key format uses the header and footer lines:
-----BEGIN PUBLIC KEY-----
-----END PUBLIC KEY-----
The PEM RSAPublicKey format uses the header and footer lines:
-----BEGIN RSA PUBLIC KEY-----
-----END RSA PUBLIC KEY-----
The NET form is a format compatible with older Netscape servers and Microsoft IIS .key
files, this uses unsalted RC4 for its encryption. It is not very secure and so should
only be used when necessary.
Some newer version of IIS have additional data in the exported .key files. To use these
with the utility, view the file with a binary editor and look for the string "private-
key", then trace back to the byte sequence 0x30, 0x82 (this is an ASN1 SEQUENCE). Copy all
the data from this point onwards to another file and use that as the input to the rsa
utility with the -inform NET option. If you get an error after entering the password try
the -sgckey option.
EXAMPLES
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
The command line password arguments don't currently work with NET format.
There should be an option that automatically handles .key files, without having to
manually edit them.
SEE ALSO
pkcs8(1), dsa(1), genrsa(1), gendsa(1)
1.0.2k 2017-01-26 RSA(1)
Generated by $Id: phpMan.php,v 4.55 2007/09/05 04:42:51 chedong Exp $ Author: Che Dong
On Apache/2.4.6 (CentOS)
Under GNU General Public License
2024-04-20 03:22 @127.0.0.1 CrawledBy Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; ClaudeBot/1.0; +claudebot@anthropic.com)