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MAN page from Trustix openssl-0.9.7m-1tr.i586.rpm

RSA

Section: OpenSSL (1)
Updated: 2003-01-30
Index 

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][-des][-des3][-idea][-text][-noout][-modulus][-check][-pubin][-pubout][-engine id] 

DESCRIPTION

The rsa command processes RSA keys. They can be converted between variousforms and their components printed out. Note this command uses thetraditional SSLeay compatible format for private key encryption: newerapplications should use the more secure PKCS#8 format using the pkcs8utility. 

COMMAND OPTIONS

-inform DER|NET|PEM
This specifies the input format. The DER option uses an ASN1 DER encodedform compatible with the PKCS#1 RSAPrivateKey or SubjectPublicKeyInfo format.The PEM form is the default format: it consists of the DER format base64encoded with additional header and footer lines. On input PKCS#8 format privatekeys are also accepted. The NET form is a format is described in the NOTESsection.
-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 thisoption is not specified. If the key is encrypted a pass phrase will beprompted for.
-passin arg
the input file password source. For more information about the format of argsee the PASS PHRASE ARGUMENTS section in openssl(1).
-out filename
This specifies the output filename to write a key to or standard output if thisoption is not specified. If any encryption options are set then a pass phrasewill be prompted for. The output filename should not be the same as the inputfilename.
-passout password
the output file password source. For more information about the format of argsee the PASS PHRASE ARGUMENTS section in openssl(1).
-sgckey
use the modified NET algorithm used with some versions of Microsoft IIS and SGCkeys.
-des|-des3|-idea
These options encrypt the private key with the DES, triple DES, or the IDEA ciphers respectively before outputting it. A pass phrase is prompted for.If none of these options is specified the key is written in plain text. Thismeans that using the rsa utility to read in an encrypted key with noencryption option can be used to remove the pass phrase from a key, or bysetting 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 inplain 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 thisoption a public key is read instead.
-pubout
by default a private key is output: with this option a publickey will be output instead. This option is automatically set ifthe input is a public key.
-engine id
specifying an engine (by it's unique id string) will cause reqto attempt to obtain a functional reference to the specified engine,thus initialising it if needed. The engine will then be set as the defaultfor 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 NET form is a format compatible with older Netscape serversand 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 .keyfiles. To use these with the utility, view the file with a binary editorand look for the string ``private-key'', then trace back to the bytesequence 0x30, 0x82 (this is an ASN1 SEQUENCE). Copy all the datafrom this point onwards to another file and use that as the inputto the rsa utility with the -inform NET option. If you getan 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
 

BUGS

The command line password arguments don't currently work withNET 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)


 

Index

NAME
SYNOPSIS
DESCRIPTION
COMMAND OPTIONS
NOTES
EXAMPLES
BUGS
SEE ALSO

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