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(Tcl) Create JWS Using Private Key on a Smart CardSee more JSON Web Signatures (JWS) ExamplesCreates and validates a JSON Web Signature (JWS) using the private key associated with a certificate on a smart card.
load ./chilkat.dll # This requires the Chilkat API to have been previously unlocked. # See Global Unlock Sample for sample code. # Load the certificate from a smart card. set cert [new_CkCert] set success [CkCert_LoadFromSmartcard $cert ""] if {$success == 0} then { puts [CkCert_lastErrorText $cert] delete_CkCert $cert exit } # Note: Chilkat provides many different ways to load a certificate from a smartcard or USB token, # such as selecting a certificate if the card contains multiple certificates with private keys, # or working with lower-level PKCS11 or ScMinidriver API's (both of which Chilkat provides). # If the associated private key was present on the smartcard, then you can simply # get it from the Chilkat cert object: # privKey is a CkPrivateKey set privKey [CkCert_ExportPrivateKey $cert] if {[CkCert_get_LastMethodSuccess $cert] == 0} then { puts [CkCert_lastErrorText $cert] delete_CkCert $cert exit } # You can check the key type to make sure it's RSA. # This will output "rsa" if the key is RSA. puts "Key type = [CkPrivateKey_keyType $privKey]" # Create the JWS Protected Header set jwsProtHdr [new_CkJsonObject] CkJsonObject_AppendString $jwsProtHdr "alg" "RS256" set jws [new_CkJws] # Set the protected header: set signatureIndex 0 CkJws_SetProtectedHeader $jws $signatureIndex $jwsProtHdr # Set the RSA key: CkJws_SetPrivateKey $jws $signatureIndex $privKey # Set the payload. set bIncludeBom 0 set payloadStr "In our village, folks say God crumbles up the old moon into stars." CkJws_SetPayload $jws $payloadStr "utf-8" $bIncludeBom # Create the JWS # By default, the compact serialization is used. set jwsCompact [CkJws_createJws $jws] if {[CkJws_get_LastMethodSuccess $jws] != 1} then { puts [CkJws_lastErrorText $jws] delete_CkPrivateKey $privKey delete_CkCert $cert delete_CkJsonObject $jwsProtHdr delete_CkJws $jws exit } puts "JWS: $jwsCompact" # sample output: # JWS: eyJhbGciOiJQUzI1NiJ9.SW4gb3VyIHZpbGxhZ2UsIGZvbGtzIHNheSBHb2QgY3J1bWJsZXMgdXAgdGhlIG9sZCBtb29uIGludG8gc3RhcnMu.TRWhwRo5dMv9-8OzrInfJTwmUGYgjLfHk8lqF072ND-FmLWEBnUTOpY8oJXp8FdWw2SalbdOeNlrtlJjwk4XK8Ql2iJ_2qMCtxsvLPhKBOqFoAF4aBvTOEDVJDxf0DaBSiydEEtfTVV2iwBcjWabu5J2XieR5y7QZQtuHsn7T3qKBvCcCejN3Y2oqAT3qMHvu1fTms1r_91wBn_K7Wjd9UkZ1n02qQcUHJznR_OF2BgN7_KWIDAF9ZS9keoju2NPpPelO4yxa2XUPnehY3G7dHKoCxUEQR4d2Xc5voqDASTVCDqQS4PVOZdvT3Ein6-SanAlCwbWBbkvT8g6-5PImQ # Now load the JWS, validate, and recover the original text. set jws2 [new_CkJws] # Load the JWS. set success [CkJws_LoadJws $jws2 $jwsCompact] # rsaPubKey is a CkPublicKey set rsaPubKey [CkPrivateKey_GetPublicKey $privKey] delete_CkPrivateKey $privKey # Set the RSA public key used for validation. set signatureIndex 0 CkJws_SetPublicKey $jws2 $signatureIndex $rsaPubKey delete_CkPublicKey $rsaPubKey # Validate the 1st (and only) signature at index 0.. set v [CkJws_Validate $jws2 $signatureIndex] if {$v < 0} then { # Perhaps Chilkat was not unlocked or the trial expired.. puts "Method call failed for some other reason." puts [CkJws_lastErrorText $jws2] delete_CkCert $cert delete_CkJsonObject $jwsProtHdr delete_CkJws $jws delete_CkJws $jws2 exit } if {$v == 0} then { puts "Invalid signature. The RSA key was incorrect, the JWS was invalid, or both." delete_CkCert $cert delete_CkJsonObject $jwsProtHdr delete_CkJws $jws delete_CkJws $jws2 exit } # If we get here, the signature was validated.. puts "Signature validated." # Recover the original content: puts [CkJws_getPayload $jws2 utf-8] # Examine the protected header: # joseHeader is a CkJsonObject set joseHeader [CkJws_GetProtectedHeader $jws2 $signatureIndex] if {[CkJws_get_LastMethodSuccess $jws2] != 1} then { puts "No protected header found at the given index." delete_CkCert $cert delete_CkJsonObject $jwsProtHdr delete_CkJws $jws delete_CkJws $jws2 exit } CkJsonObject_put_EmitCompact $joseHeader 0 puts "Protected (JOSE) header:" puts [CkJsonObject_emit $joseHeader] delete_CkJsonObject $joseHeader # Output: # Signature validated. # In our village, folks say God crumbles up the old moon into stars. # Protected (JOSE) header: # { # "alg": "RS256" # } delete_CkCert $cert delete_CkJsonObject $jwsProtHdr delete_CkJws $jws delete_CkJws $jws2 |
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