Solidity Insecure Random Generator

InsecureRandomGenerator.sol

// Insecure random generator for Solidity. Can be manipulated by the miners

contract InsecureRandomGenerator {
    bytes32 public randseed;

    function pseudoRandom(uint start, uint end) returns (uint) {
        bytes32 prevBlockHash = block.blockhash(block.number-1);
        randseed = keccak256(randseed, prevBlockHash, block.timestamp, 
            block.coinbase, block.difficulty, block.number);
        uint range = end - start + 1;
        uint randVal = start + uint256(randseed) % range;
        return randVal;
    }
}