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const GF2_DIM: usize = 32; fn gf2_matrix_times(mat: &[u32; GF2_DIM], mut vec: u32) -> u32 { let mut sum = 0; let mut idx = 0; while vec > 0 { if vec & 1 == 1 { sum ^= mat[idx]; } vec >>= 1; idx += 1; } return sum; } fn gf2_matrix_square(square: &mut [u32; GF2_DIM], mat: &[u32; GF2_DIM]) { for n in 0..GF2_DIM { square[n] = gf2_matrix_times(mat, mat[n]); } } pub(crate) fn combine(mut crc1: u32, crc2: u32, mut len2: u64) -> u32 { let mut row: u32; let mut even = [0u32; GF2_DIM]; /* even-power-of-two zeros operator */ let mut odd = [0u32; GF2_DIM]; /* odd-power-of-two zeros operator */ /* degenerate case (also disallow negative lengths) */ if len2 <= 0 { return crc1; } /* put operator for one zero bit in odd */ odd[0] = 0xedb88320; /* CRC-32 polynomial */ row = 1; for n in 1..GF2_DIM { odd[n] = row; row <<= 1; } /* put operator for two zero bits in even */ gf2_matrix_square(&mut even, &odd); /* put operator for four zero bits in odd */ gf2_matrix_square(&mut odd, &even); /* apply len2 zeros to crc1 (first square will put the operator for one zero byte, eight zero bits, in even) */ loop { /* apply zeros operator for this bit of len2 */ gf2_matrix_square(&mut even, &odd); if len2 & 1 == 1 { crc1 = gf2_matrix_times(&even, crc1); } len2 >>= 1; /* if no more bits set, then done */ if len2 == 0 { break; } /* another iteration of the loop with odd and even swapped */ gf2_matrix_square(&mut odd, &even); if len2 & 1 == 1 { crc1 = gf2_matrix_times(&odd, crc1); } len2 >>= 1; /* if no more bits set, then done */ if len2 == 0 { break; } } /* return combined crc */ crc1 ^= crc2; return crc1; }