pub fn words_to_digits31(w: [b64; 8]) -> [b17; 31]Expand description
Little-endian 64-bit words to thirty-one 17-bit digits.
Digit k is bits 17k .. 17k + 17 of the 512-bit value (527 bits of
digits, the top 15 zero). This is the multiplicand format of the scalar
ring.