Dancing Offbit: ChaCha PRNG Typo Vulnerability

This report describes a critical implementation bug in a ChaCha20-based PRNG implemented in Java where the use of a signed right shift (>>) instead of an unsigned right shift (>>>) in rotateLeft32() causes severe output bias (notably abundant 0xFF bytes), compromising cryptographic security; the issue was fixed by replacing the operator with >>> and corrected output distributions were observed.