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openssl_spki_verify(3) [php man page]


openssl_spki_verify - Verifies a signed public key and challenge

string openssl_spki_verify (string &$spkac) DESCRIPTION
Validates the supplied signed public key and challenge PARAMETERS
o $spkac - Expects a valid signed public key and challenge RETURN VALUES
Returns a boolean on success or failure. ERRORS
/EXCEPTIONS Emits an E_WARNING level error if an invalid argument is passed via the $spkac parameter. EXAMPLES
Example #1 openssl_spki_verify(3) example Validates an existing signed public key and challenge <?php $pkey = openssl_pkey_new('secret password'); $spkac = openssl_spki_new($pkey, 'challenge string'); if (openssl_spki_verify(preg_replace('/SPKAC=/', '', $spkac))) { echo $spkac; } else { echo "SPKAC validation failed"; } ?> Example #2 openssl_spki_verify(3) example from <keygen> Validates an existing signed public key and challenge issued from the <keygen> element <?php if (openssl_spki_verify(preg_replace('/SPKAC=/', '', $_POST['spkac']))) { echo $spkac; } else { echo "SPKAC validation failed"; } ?> <keygen name="spkac" challenge="challenge string" keytype="RSA"> SEE ALSO
openssl_spki_new(3), openssl_spki_export_challenge(3), openssl_spki_export(3), openssl_md_method(3), openssl_csr_new(3), openssl_csr_sign(3). PHP Documentation Group OPENSSL_SPKI_VERIFY(3)

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SPKAC(1SSL)							      OpenSSL							       SPKAC(1SSL)

spkac - SPKAC printing and generating utility SYNOPSIS
openssl spkac [-in filename] [-out filename] [-key keyfile] [-passin arg] [-challenge string] [-pubkey] [-spkac spkacname] [-spksect section] [-noout] [-verify] [-engine id] DESCRIPTION
The spkac command processes Netscape signed public key and challenge (SPKAC) files. It can print out their contents, verify the signature and produce its own SPKACs from a supplied private key. COMMAND OPTIONS
-in filename This specifies the input filename to read from or standard input if this option is not specified. Ignored if the -key option is used. -out filename specifies the output filename to write to or standard output by default. -key keyfile create an SPKAC file using the private key in keyfile. The -in, -noout, -spksect and -verify options are ignored if present. -passin password the input file password source. For more information about the format of arg see the PASS PHRASE ARGUMENTS section in openssl(1). -challenge string specifies the challenge string if an SPKAC is being created. -spkac spkacname allows an alternative name form the variable containing the SPKAC. The default is "SPKAC". This option affects both generated and input SPKAC files. -spksect section allows an alternative name form the section containing the SPKAC. The default is the default section. -noout don't output the text version of the SPKAC (not used if an SPKAC is being created). -pubkey output the public key of an SPKAC (not used if an SPKAC is being created). -verify verifies the digital signature on the supplied SPKAC. -engine id specifying an engine (by its unique id string) will cause spkac 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. EXAMPLES
Print out the contents of an SPKAC: openssl spkac -in spkac.cnf Verify the signature of an SPKAC: openssl spkac -in spkac.cnf -noout -verify Create an SPKAC using the challenge string "hello": openssl spkac -key key.pem -challenge hello -out spkac.cnf Example of an SPKAC, (long lines split up for clarity): SPKAC=MIG5MGUwXDANBgkqhkiG9w0BAQEFAANLADBIAkEA1cCoq2Wa3Ixs47uI7F PVwHVIPDx5yso105Y6zpozam135a8R0CpoRvkkigIyXfcCjiVi5oWk+6FfPaD03u PFoQIDAQABFgVoZWxsbzANBgkqhkiG9w0BAQQFAANBAFpQtY/FojdwkJh1bEIYuc 2EeM2KHTWPEepWYeawvHD0gQ3DngSC75YCWnnDdq+NQ3F+X4deMx9AaEglZtULwV 4= NOTES
A created SPKAC with suitable DN components appended can be fed into the ca utility. SPKACs are typically generated by Netscape when a form is submitted containing the KEYGEN tag as part of the certificate enrollment process. The challenge string permits a primitive form of proof of possession of private key. By checking the SPKAC signature and a random challenge string some guarantee is given that the user knows the private key corresponding to the public key being certified. This is important in some applications. Without this it is possible for a previous SPKAC to be used in a "replay attack". SEE ALSO
ca(1) 1.0.0e 2009-04-10 SPKAC(1SSL)

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