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fix: cbdEta3 3-byte read for cross-boundary bits

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When bitOff >= 3, 6 bits can span 3 bytes. Previously only read 2 bytes,
which would silently lose high bits and produce incorrect coefficients.
This commit is contained in:
zeekay
2026-03-22 20:34:40 -07:00
parent fa52b7ecb2
commit f303ffce3c
1 changed files with 3 additions and 1 deletions
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ring/sampler_cbd.go
+3 -1
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@@ -157,7 +157,9 @@ func (s *CBDSampler) cbdEta3(coeffs [][]uint64, moduli []uint64, N int, buf []by
bitOff := uint(bitPos % 8)
var bits6 uint64
if byteIdx+1 < len(buf) {
if byteIdx+2 < len(buf) {
bits6 = (uint64(buf[byteIdx]) | uint64(buf[byteIdx+1])<<8 | uint64(buf[byteIdx+2])<<16) >> bitOff
} else if byteIdx+1 < len(buf) {
bits6 = (uint64(buf[byteIdx]) | uint64(buf[byteIdx+1])<<8) >> bitOff
} else {
bits6 = uint64(buf[byteIdx]) >> bitOff