Creating a public key for signature verification from a certificate

IMPORT xml

MAIN
  DEFINE x509 xml.CryptoX509
  DEFINE key xml.CryptoKey
  LET x509 = xml.CryptoX509.Create()
  TRY
    CALL x509.loadPEM("RSA1024Certificate.crt");
  CATCH
    DISPLAY "Unable to load certificate :",STATUS
    EXIT PROGRAM
  END TRY
  TRY
    LET key = x509.createPublicKey("http://www.w3.org/2000/09/xmldsig#rsa-sha1")
    DISPLAY "Key size (in bytes) : ",key.getSize() # displays 1024 (bits)
    DISPLAY "Key type : ",key.getType() # displays PUBLIC
    DISPLAY "Key usage : ",key.getUsage() # displays SIGNATURE
  CATCH
    DISPLAY "Unable to create public key :",STATUS
  END TRY
END MAIN