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rsautl (1)
  • >> rsautl (1) ( Solaris man: Команды и прикладные программы пользовательского уровня )
  • rsautl (1) ( Linux man: Команды и прикладные программы пользовательского уровня )
  • 
    
    

    NAME

         rsautl - RSA utility
    
    
    

    SYNOPSIS

         openssl rsautl [-in file] [-out file] [-inkey file] [-pubin]
         [-certin] [-sign] [-verify] [-encrypt] [-decrypt] [-pkcs]
         [-ssl] [-raw] [-hexdump] [-asn1parse]
    
    
    

    DESCRIPTION

         The rsautl command can be used to sign, verify, encrypt and
         decrypt data using the RSA algorithm.
    
    
    

    COMMAND OPTIONS

         -in filename
             This specifies the input filename to read data from or
             standard input if this option is not specified.
    
         -out filename
             specifies the output filename to write to or standard
             output by default.
    
         -inkey file
             the input key file, by default it should be an RSA
             private key.
    
         -pubin
             the input file is an RSA public key.
    
         -certin
             the input is a certificate containing an RSA public key.
    
         -sign
             sign the input data and output the signed result. This
             requires and RSA private key.
    
         -verify
             verify the input data and output the recovered data.
    
         -encrypt
             encrypt the input data using an RSA public key.
    
         -decrypt
             decrypt the input data using an RSA private key.
    
         -pkcs, -oaep, -ssl, -raw
             the padding to use: PKCS#1 v1.5 (the default), PKCS#1
             OAEP, special padding used in SSL v2 backwards
             compatible handshakes, or no padding, respectively.  For
             signatures, only -pkcs and -raw can be used.
    
         -hexdump
             hex dump the output data.
    
         -asn1parse
             asn1parse the output data, this is useful when combined
             with the -verify option.
    
    
    

    NOTES

         rsautl because it uses the RSA algorithm directly can only
         be used to sign or verify small pieces of data.
    
    
    

    EXAMPLES

         Sign some data using a private key:
    
          openssl rsautl -sign -in file -inkey key.pem -out sig
    
         Recover the signed data
    
          openssl rsautl -sign -in sig -inkey key.pem
    
         Examine the raw signed data:
    
          openssl rsautl -sign -in file -inkey key.pem -raw -hexdump
    
          0000 - 00 01 ff ff ff ff ff ff-ff ff ff ff ff ff ff ff   ................
          0010 - ff ff ff ff ff ff ff ff-ff ff ff ff ff ff ff ff   ................
          0020 - ff ff ff ff ff ff ff ff-ff ff ff ff ff ff ff ff   ................
          0030 - ff ff ff ff ff ff ff ff-ff ff ff ff ff ff ff ff   ................
          0040 - ff ff ff ff ff ff ff ff-ff ff ff ff ff ff ff ff   ................
          0050 - ff ff ff ff ff ff ff ff-ff ff ff ff ff ff ff ff   ................
          0060 - ff ff ff ff ff ff ff ff-ff ff ff ff ff ff ff ff   ................
          0070 - ff ff ff ff 00 68 65 6c-6c 6f 20 77 6f 72 6c 64   .....hello world
    
         The PKCS#1 block formatting is evident from this. If this
         was done using encrypt and decrypt the block would have been
         of type 2 (the second byte) and random padding data visible
         instead of the 0xff bytes.
    
         It is possible to analyse the signature of certificates
         using this utility in conjunction with asn1parse. Consider
         the self signed example in certs/pca-cert.pem . Running
         asn1parse as follows yields:
    
          openssl asn1parse -in pca-cert.pem
    
    
    
             0:d=0  hl=4 l= 742 cons: SEQUENCE
             4:d=1  hl=4 l= 591 cons:  SEQUENCE
             8:d=2  hl=2 l=   3 cons:   cont [ 0 ]
            10:d=3  hl=2 l=   1 prim:    INTEGER           :02
            13:d=2  hl=2 l=   1 prim:   INTEGER           :00
            16:d=2  hl=2 l=  13 cons:   SEQUENCE
            18:d=3  hl=2 l=   9 prim:    OBJECT            :md5WithRSAEncryption
            29:d=3  hl=2 l=   0 prim:    NULL
            31:d=2  hl=2 l=  92 cons:   SEQUENCE
            33:d=3  hl=2 l=  11 cons:    SET
            35:d=4  hl=2 l=   9 cons:     SEQUENCE
            37:d=5  hl=2 l=   3 prim:      OBJECT            :countryName
            42:d=5  hl=2 l=   2 prim:      PRINTABLESTRING   :AU
           ....
           599:d=1  hl=2 l=  13 cons:  SEQUENCE
           601:d=2  hl=2 l=   9 prim:   OBJECT            :md5WithRSAEncryption
           612:d=2  hl=2 l=   0 prim:   NULL
           614:d=1  hl=3 l= 129 prim:  BIT STRING
    
         The final BIT STRING contains the actual signature. It can
         be extracted with:
    
          openssl asn1parse -in pca-cert.pem -out sig -noout -strparse 614
    
         The certificate public key can be extracted with:
    
          openssl x509 -in test/testx509.pem -pubout -noout
         >pubkey.pem
    
         The signature can be analysed with:
    
          openssl rsautl -in sig -verify -asn1parse -inkey pubkey.pem -pubin
    
             0:d=0  hl=2 l=  32 cons: SEQUENCE
             2:d=1  hl=2 l=  12 cons:  SEQUENCE
             4:d=2  hl=2 l=   8 prim:   OBJECT            :md5
            14:d=2  hl=2 l=   0 prim:   NULL
            16:d=1  hl=2 l=  16 prim:  OCTET STRING
               0000 - f3 46 9e aa 1a 4a 73 c9-37 ea 93 00 48 25 08 b5   .F...Js.7...H%..
    
         This is the parsed version of an ASN1 DigestInfo structure.
         It can be seen that the digest used was md5. The actual part
         of the certificate that was signed can be extracted with:
    
          openssl asn1parse -in pca-cert.pem -out tbs -noout -strparse 4
    
         and its digest computed with:
    
          openssl md5 -c tbs
          MD5(tbs)= f3:46:9e:aa:1a:4a:73:c9:37:ea:93:00:48:25:08:b5
    
         which it can be seen agrees with the recovered value above.
    
    
    

    SEE ALSO

         dgst(1), rsa(1), genrsa(1)
    
    
    
    


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