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String token = "QDG6eK";
String timeStamp = "1409659589";
String nonce = "263014780";
String echoStr = "P9nAzCzyDtyTWESHep1vC5X9xho/qYX3Zpb4yKa9SKld1DsH3Iyt3tP3zNdtp+4RPcs8TgAE7OaBO+FZXvnaqQ==";
String verifyMsgSig = "5c45ff5e21c57e6ad56bac8758b79b1d9ac89fd3";

def params = []
params.add(token)
params.add(timeStamp)
params.add(nonce)
params.add(echoStr)

def messageDigest = java.security.MessageDigest.getInstance("SHA1")
messageDigest.update(params.sort().join().getBytes())
println(verifyMsgSig.equals(messageDigest.digest().encodeHex().toString()))