RSA Error with keytool and jdk 1.5

Hello,

I am trying to create an RSA key with JDK 1.5 and keytool so that windows GAIM can connect to jive. I am doing the following command but get the following error:

/usr/jdk1.5.0_06/bin/keytool -genkey -keyalg RSA -sigalg RSA -keystore keystore -alias jive.domain.com

output:

keytool error: java.security.NoSuchAlgorithmException: RSA Signature not available

anyone know how to work around this ?