ByteEncode₁₀, according to FIPS 203, Algorithm 5. func ringCompressAndEncod(s []byte, f ringElement) []byte { s, b := sliceForAppend(s, encodingSize10) for i := 0; i < n; i += 4 { var x uint64 x |= uint64(compress(f[i], 10)) x |= uint64(compress(f[i+1], 10)) << 10 x |= uint64(compress(f[i+2], 10)) << 20 x |= uint64(compress(f[i+3], 10)) << 30 b[0] = uint8(x) b[1] = uint8(x >> 8) b[2] = uint8(x >> 16) b[3] = uint8(x >> 24) b[4] = uint8(x >> 32) b = b[5:] } return s } // ringDecodeAndDecompr decodes a 320-byte...