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(Tcl) RSA Signature/Verify with .key and .cerSee more RSA ExamplesDemonstrates how to use a .key file (private key) and digital certificate (.cer, public key) to create and verify an RSA signature.Note: This example requires Chilkat v11.0.0 or greater.
load ./chilkat.dll set success 0 # This example assumes the Chilkat API to have been previously unlocked. # See Global Unlock Sample for sample code. set privKey [new_CkPrivateKey] # Load the private key from an RSA .key file: set success [CkPrivateKey_LoadPemFile $privKey "privateKey.key"] if {$success == 0} then { puts [CkPrivateKey_lastErrorText $privKey] delete_CkPrivateKey $privKey exit } set rsa [new_CkRsa] # Import the private key into the RSA component: set success [CkRsa_UsePrivateKey $rsa $privKey] if {$success == 0} then { puts [CkRsa_lastErrorText $rsa] delete_CkPrivateKey $privKey delete_CkRsa $rsa exit } # Create the signature as a hex string: CkRsa_put_EncodingMode $rsa "hex" set strData "This is the string to be signed." # Sign the string using the sha256 hash algorithm. # Other valid choices are "md2", "sha1", "sha384", # "sha512", and "md5". set hexSig [CkRsa_signStringENC $rsa $strData "sha256"] puts "$hexSig" # Load a digital certificate from a .cer file: set cert [new_CkCert] set success [CkCert_LoadFromFile $cert "myCert.cer"] if {$success == 0} then { puts [CkCert_lastErrorText $cert] delete_CkPrivateKey $privKey delete_CkRsa $rsa delete_CkCert $cert exit } set pubKey [new_CkPublicKey] CkCert_GetPublicKey $cert $pubKey # Now verify using a new instance of the RSA object: set rsa2 [new_CkRsa] # Import the public key into the RSA object: set success [CkRsa_UsePublicKey $rsa2 $pubKey] if {$success == 0} then { puts [CkRsa_lastErrorText $rsa2] delete_CkPrivateKey $privKey delete_CkRsa $rsa delete_CkCert $cert delete_CkPublicKey $pubKey delete_CkRsa $rsa2 exit } # The signature is a hex string, so make sure the EncodingMode is correct: CkRsa_put_EncodingMode $rsa2 "hex" # Verify the signature: set success [CkRsa_VerifyStringENC $rsa2 $strData "sha256" $hexSig] if {$success == 0} then { puts [CkRsa_lastErrorText $rsa2] delete_CkPrivateKey $privKey delete_CkRsa $rsa delete_CkCert $cert delete_CkPublicKey $pubKey delete_CkRsa $rsa2 exit } puts "Success." delete_CkPrivateKey $privKey delete_CkRsa $rsa delete_CkCert $cert delete_CkPublicKey $pubKey delete_CkRsa $rsa2 |
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