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    Command:

    rsa

    
    
    

    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
           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.
    
           -des|-des3|-idea
               These options encrypt the private key with the DES, triple DES, or
    
           -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.
    
           -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 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:
    
    
    

    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)
    
    
    

    1.0.1e 2013-02-11 RSA(1)

    
    
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