pbkdf2 import ( "crypto/internal/fips140" "crypto/internal/fips140/hmac" "errors" "hash" ) // divRoundUp divides x+y-1 by y, rounding up if the result is not whole. // This function casts x and y to int64 in order to avoid cases where // x+y would overflow int on systems where int is an int32. The result // is an int, which is safe as (x+y-1)/y should always fit, regardless // of the integer size. func divRoundUp(x, y int) int { return int((int64(x) + int64(y) - 1) / int64(y)) } func Key[Hash hash.Hash](h...