Does anybody know if there are at least two different algorithm hiding under this name? I have to check the CRC32 on an incoming byte array. The CRC32 which comes with this frame has been calculated with an algorithm written in C (and generated by myself). I use the java.util.zip.CRC32 class from the jdk 1.3 to calculate the CRC32 on the byte array and match it with the CRC32 at the end of the frame. But I do not find the same result. Looking at the source does not help since native methods are called. The javadoc is not much clearer since there are no link on the CRC32 specifications. W.